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Segmentation fault using the Measure command #14076

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2 tasks done
furgo16 opened this issue May 17, 2024 · 9 comments
Open
2 tasks done

Segmentation fault using the Measure command #14076

furgo16 opened this issue May 17, 2024 · 9 comments
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Bug This issue or PR is related to a bug Core Issue or PR touches core sections (App, Gui, Base) of FreeCAD

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@furgo16
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furgo16 commented May 17, 2024

Is there an existing issue for this?

  • I have searched the existing issues

Problem description

Steps to reproduce:

  1. Open FreeCAD
  2. Create a new document
  3. Switch to Part workbench
  4. Create a cube
  5. Select the cube
  6. Click on the Measure command (Std_Measure)
  7. FreeCAD crashes (see stacktrace)

Full version info

OS: Ubuntu Core 22 (ubuntu:GNOME/ubuntu)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37330 (Git) Snap 1022
Build type: Release
Branch: main
Hash: a094bf0df7e2b3e5c5b2e3b158a9040a6474892f
Python 3.10.12, Qt 5.15.10, Coin 4.0.0, Vtk 7.1.1, OCC 7.7.1
Installed mods: 
  * OpenTheme 2024.5.16
  * Curves 0.6.36
  * ezydxf
  * ExplodedAssembly
  * BillOfMaterials 0.0.8.2
  * Ondsel-Lens 2024.5.6.01

Subproject(s) affected?

Core

Anything else?

Program received signal SIGSEGV, Segmentation fault.
#0  /lib/x86_64-linux-gnu/libc.so.6(+0x42520) [0x7f268f0b3520]
#1  0x7f26921d28cb in Gui::DAG::Model::slotChangeObject(Gui::ViewProviderDocumentObject const&, App::Property const&) from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x13b
#2  0x7f2691edc0a9 in boost::signals2::detail::signal_impl<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(Gui::ViewProviderDocumentObject const&, App::Property const&) from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x1f9
#3  0x7f2691ebfa70 in Gui::Document::slotChangedObject(App::DocumentObject const&, App::Property const&) from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x200
#4  0x7f269147f6e9 in boost::signals2::detail::signal_impl<void (App::DocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(App::DocumentObject const&, App::Property const&) from /snap/freecad/1022/usr/lib/libFreeCADApp.so+0x1f9
#5  0x7f26914a60ca in App::DocumentObject::onChanged(App::Property const*) from /snap/freecad/1022/usr/lib/libFreeCADApp.so+0x12a
#6  0x7f26915e8425 in App::Property::hasSetValue() from /snap/freecad/1022/usr/lib/libFreeCADApp.so+0x145
#7  0x7f269166853d in App::PropertyString::setValue(char const*) from /snap/freecad/1022/usr/lib/libFreeCADApp.so+0x12d
#8  0x7f2650f6c127 in MeasureGui::ViewProviderMeasureBase::updateData(App::Property const*) from /snap/freecad/1022/usr/lib/MeasureGui.so+0x4b7
#9  0x7f26923d4af0 in Gui::ViewProviderDocumentObject::updateView() from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x100
#10  0x7f2650f6c6f7 in MeasureGui::ViewProviderMeasure::positionAnno(Measure::MeasureBase const*) from /snap/freecad/1022/usr/lib/MeasureGui.so+0x127
#11  0x7f2691ec03d4 in Gui::Document::slotNewObject(App::DocumentObject const&) from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x504
#12  0x7f26914825e1 in boost::signals2::detail::signal_impl<void (App::DocumentObject const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&)>, boost::signals2::mutex>::operator()(App::DocumentObject const&) from /snap/freecad/1022/usr/lib/libFreeCADApp.so+0x1d1
#13  0x7f26914402a9 in App::Document::addObject(char const*, char const*, bool, char const*, bool) from /snap/freecad/1022/usr/lib/libFreeCADApp.so+0x299
#14  0x7f26920ac5aa in Gui::TaskMeasure::update() from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x8fa
#15  0x7f268f80c39e in QObject::event(QEvent*) from /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x2ae
#16  0x7f2690378763 in QApplicationPrivate::notify_helper(QObject*, QEvent*) from /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Widgets.so.5+0x83
#17  0x7f2691f23798 in Gui::GUIApplication::notify(QObject*, QEvent*) from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x98
#18  0x7f268f7dee4a in QCoreApplication::notifyInternal2(QObject*, QEvent*) from /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x13a
#19  0x7f268f7e1f47 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) from /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x187
#20  /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Core.so.5(+0x316ce7) [0x7f268f838ce7]
#21  /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_dispatch+0x26b) [0x7f268d27bd3b]
#22  /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0xab258) [0x7f268d2d1258]
#23  /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0(g_main_context_iteration+0x33) [0x7f268d2793e3]
#24  0x7f268f838338 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) from /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x68
#25  0x7f268f7dd76b in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) from /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x12b
#26  0x7f268f7e5d14 in QCoreApplication::exec() from /snap/freecad/1022/kf5/usr/lib/x86_64-linux-gnu/libQt5Core.so.5+0x94
#27  0x7f2691e5e2d4 in Gui::Application::runApplication() from /snap/freecad/1022/usr/lib/libFreeCADGui.so+0x6c4
#28  /snap/freecad/1022/usr/bin/FreeCAD(+0xa709) [0x55b3c674d709]
#29  /lib/x86_64-linux-gnu/libc.so.6(+0x29d90) [0x7f268f09ad90]
#30  /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x80) [0x7f268f09ae40]
#31  /snap/freecad/1022/usr/bin/FreeCAD(+0xaac5) [0x55b3c674dac5]

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@maxwxyz
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maxwxyz commented May 17, 2024 •
edited

I cannot reproduce on Windows.
@hlorus FYI

@maxwxyz maxwxyz added Core Issue or PR touches core sections (App, Gui, Base) of FreeCAD Missing: confirmation Missing confirmation from other testers labels May 17, 2024
@xtemp09
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xtemp09 commented May 17, 2024

I cannot reproduce.

OS: Ubuntu 22.04.3 LTS (KDE/plasma)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37303 (Git)
Build type: Debug
Branch: main
Hash: 869cb1f83b5f92ee134dafde46c9c5e0dceb8889
Python 3.10.12, Qt 5.15.12, Coin 4.0.0, Vtk 9.1.0, OCC 7.5.1
Locale: English/United States (en_US)

@xtemp09
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xtemp09 commented May 18, 2024

Staring at the backtrace, I noticed Gui::DAG::Model::slotChangeObject. I activated DAGView and managed to reproduce the crash. This issue is connected to #12163.

Here is the backtrace for Linux.

Backtrace 
Process 2557 stopped
* thread #1, name = 'FreeCAD', stop reason = signal SIGABRT
    frame #0: 0x00007ffff32969fc libc.so.6`__GI___pthread_kill at pthread_kill.c:44:76
(lldb) bt
* thread #1, name = 'FreeCAD', stop reason = signal SIGABRT
  * frame #0: 0x00007ffff32969fc libc.so.6`__GI___pthread_kill at pthread_kill.c:44:76
    frame #1: 0x00007ffff32969b0 libc.so.6`__GI___pthread_kill [inlined] __pthread_kill_internal(signo=6, threadid=140737256995456) at pthread_kill.c:78:10
    frame #2: 0x00007ffff32969b0 libc.so.6`__GI___pthread_kill(threadid=140737256995456, signo=6) at pthread_kill.c:89:10
    frame #3: 0x00007ffff3242476 libc.so.6`__GI_raise(sig=6) at raise.c:26:13
    frame #4: 0x00007ffff32287f3 libc.so.6`__GI_abort at abort.c:79:7
    frame #5: 0x00007ffff322871b libc.so.6`__assert_fail_base.cold at assert.c:92:3
    frame #6: 0x00007ffff3239e96 libc.so.6`__GI___assert_fail(assertion="it != list.end()", file="/home/xtemp09/Downloads/FreeCAD/freecad-source/src/Gui/DAGView/DAGModelGraph.cpp", line=81, function="const Gui::DAG::GraphLinkRecord& Gui::DAG::findRecord(const Gui::ViewProviderDocumentObject*, const GraphLinkContainer&)") at assert.c:101:3
    frame #7: 0x00007ffff6f1ff30 libFreeCADGui.so`Gui::DAG::findRecord(VPDObjectIn=<unavailable>, containerIn=0x00005555599f6b30) at DAGModelGraph.cpp:81:3
    frame #8: 0x00007ffff6f1365a libFreeCADGui.so`Gui::DAG::Model::slotChangeObject(this=0x000055555833ad80, VPDObjectIn=0x000055555a6ef2b0, propertyIn=0x000055555a6eed88) at DAGModel.cpp:311:47
    frame #9: 0x00007ffff6f1c268 libFreeCADGui.so`void std::__invoke_impl<void, void (Gui::DAG::Model::*&)(Gui::ViewProviderDocumentObject const&, App::Property const&), Gui::DAG::Model*&, Gui::ViewProviderDocumentObject const&, App::Property const&>((null)=__invoke_memfun_deref @ 0x00007fffffffad50, __f=<unavailable>, __t=<unavailable>, (null)=<unavailable>, (null)=<unavailable>) at invoke.h:74:46
    frame #10: 0x00007ffff6f1c290 libFreeCADGui.so`void std::_Bind<void (Gui::DAG::Model::* (Gui::DAG::Model*, std::_Placeholder<1>, std::_Placeholder<2>))(Gui::ViewProviderDocumentObject const&, App::Property const&)>::operator()<Gui::ViewProviderDocumentObject const&, App::Property const&, void>(Gui::ViewProviderDocumentObject const&, App::Property const&) [inlined] std::__invoke_result<void (Gui::DAG::Model::*&)(Gui::ViewProviderDocumentObject const&, App::Property const&), Gui::DAG::Model*&, Gui::ViewProviderDocumentObject const&, App::Property const&>::type std::__invoke<void (Gui::DAG::Model::*&)(Gui::ViewProviderDocumentObject const&, App::Property const&), Gui::DAG::Model*&, Gui::ViewProviderDocumentObject const&, App::Property const&>((null)=0x000055555a6eed88, (null)=0x000055555a6ef2b0, (null)=<unavailable>, __fn=<unavailable>) at invoke.h:96:40
    frame #11: 0x00007ffff6f1c285 libFreeCADGui.so`void std::_Bind<void (Gui::DAG::Model::* (Gui::DAG::Model*, std::_Placeholder<1>, std::_Placeholder<2>))(Gui::ViewProviderDocumentObject const&, App::Property const&)>::operator()<Gui::ViewProviderDocumentObject const&, App::Property const&, void>(Gui::ViewProviderDocumentObject const&, App::Property const&) [inlined] void std::_Bind<void (Gui::DAG::Model::* (Gui::DAG::Model*, std::_Placeholder<1>, std::_Placeholder<2>))(Gui::ViewProviderDocumentObject const&, App::Property const&)>::__call<void, Gui::ViewProviderDocumentObject const&, App::Property const&, 0ul, 1ul, 2ul>((null)=<unavailable>, __args=0x00007fffffffad50, this=<unavailable>) at functional:506:24
    frame #12: 0x00007ffff6f1c281 libFreeCADGui.so`void std::_Bind<void (Gui::DAG::Model::* (Gui::DAG::Model*, std::_Placeholder<1>, std::_Placeholder<2>))(Gui::ViewProviderDocumentObject const&, App::Property const&)>::operator()<Gui::ViewProviderDocumentObject const&, App::Property const&, void>(this=<unavailable>, (null)=0x000055555a6ef2b0, (null)=0x000055555a6eed88) at functional:591:32
    frame #13: 0x00007ffff6f1c29f libFreeCADGui.so`boost::detail::function::void_function_obj_invoker2<std::_Bind<void (Gui::DAG::Model::* (Gui::DAG::Model*, std::_Placeholder<1>, std::_Placeholder<2>))(Gui::ViewProviderDocumentObject const&, App::Property const&)>, void, Gui::ViewProviderDocumentObject const&, App::Property const&>::invoke(function_obj_ptr=<unavailable>, a0=<unavailable>, a1=<unavailable>) at function_template.hpp:158:11
    frame #14: 0x00007ffff6cdb8a7 libFreeCADGui.so`boost::function2<void, Gui::ViewProviderDocumentObject const&, App::Property const&>::operator()(this=<unavailable>, a0=<unavailable>, a1=<unavailable>) const at function_template.hpp:763:28
    frame #15: 0x00007ffff6cdb969 libFreeCADGui.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>> const&) const [inlined] boost::signals2::detail::void_type boost::signals2::detail::call_with_tuple_args<boost::signals2::detail::void_type>::m_invoke<boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>, 0u, 1u, Gui::ViewProviderDocumentObject const&, App::Property const&>((null)=0x0000000000000000, args=0x00007fffffffb020, (null)=<unavailable>, func=<unavailable>, this=<unavailable>) const at variadic_slot_invoker.hpp:105:15
    frame #16: 0x00007ffff6cdb959 libFreeCADGui.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>> const&) const [inlined] boost::signals2::detail::void_type boost::signals2::detail::call_with_tuple_args<boost::signals2::detail::void_type>::operator()<boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>, Gui::ViewProviderDocumentObject const&, App::Property const&, 2ul>((null)=<unavailable>, args=0x00007fffffffb020, func=<unavailable>, this=<unavailable>) const at variadic_slot_invoker.hpp:90:32
    frame #17: 0x00007ffff6cdb959 libFreeCADGui.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(this=0x00007fffffffb020, connectionBody=<unavailable>) const at variadic_slot_invoker.hpp:133:53
    frame #18: 0x00007ffff6cdb99d libFreeCADGui.so`boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>::dereference(this=0x00007fffffffae10) const at slot_call_iterator.hpp:110:43
    frame #19: 0x00007ffff6ce11a2 libFreeCADGui.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>) const [inlined] boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>::reference boost::iterators::iterator_core_access::dereference<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(f=0x00007fffffffae10) at iterator_facade.hpp:550:31
    frame #20: 0x00007ffff6ce1199 libFreeCADGui.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>) const [inlined] boost::iterators::detail::iterator_facade_base<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>, boost::signals2::detail::void_type, boost::iterators::single_pass_traversal_tag, boost::signals2::detail::void_type const&, long, false, false>::operator*(this=0x00007fffffffae10) const at iterator_facade.hpp:656:53
    frame #21: 0x00007ffff6ce1199 libFreeCADGui.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(this=<unavailable>, first=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const Gui::ViewProviderDocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffae10, last=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const Gui::ViewProviderDocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffae30) const at optional_last_value.hpp:57:13
    frame #22: 0x00007ffff6ce141c libFreeCADGui.so`boost::signals2::detail::signal_impl<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(Gui::ViewProviderDocumentObject const&, App::Property const&) [inlined] void boost::signals2::detail::combiner_invoker<void>::operator()<boost::signals2::optional_last_value<void>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, Gui::ViewProviderDocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(last=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const Gui::ViewProviderDocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffaef0, first=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const Gui::ViewProviderDocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const Gui::ViewProviderDocumentObject&, const App::Property&), boost::function<void(const Gui::ViewProviderDocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffaed0, combiner=<unavailable>, this=<unavailable>) const at result_type_wrapper.hpp:64:19
    frame #23: 0x00007ffff6ce13ec libFreeCADGui.so`boost::signals2::detail::signal_impl<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(this=<unavailable>, args#0=0x000055555a6ef2b0, args#1=0x000055555a6eed88) at signal_template.hpp:243:13
    frame #24: 0x00007ffff6ce14f2 libFreeCADGui.so`boost::signals2::signal<void (Gui::ViewProviderDocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, Gui::ViewProviderDocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(this=<unavailable>, args#0=0x000055555a6ef2b0, args#1=0x000055555a6eed88) at signal_template.hpp:722:25
    frame #25: 0x00007ffff6cc15e5 libFreeCADGui.so`Gui::Document::slotChangedObject(this=0x0000555555ea4790, Obj=<unavailable>, Prop=0x000055555a6eed88) at Document.cpp:828:32
    frame #26: 0x00007ffff6cd74df libFreeCADGui.so`void std::__invoke_impl<void, void (Gui::Document::*&)(App::DocumentObject const&, App::Property const&), Gui::Document*&, App::DocumentObject const&, App::Property const&>((null)=__invoke_memfun_deref @ 0x00007fffffffb2f0, __f=<unavailable>, __t=<unavailable>, (null)=<unavailable>, (null)=<unavailable>) at invoke.h:74:46
    frame #27: 0x00007ffff6cd7508 libFreeCADGui.so`void std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>, std::_Placeholder<2>))(App::DocumentObject const&, App::Property const&)>::operator()<App::DocumentObject const&, App::Property const&, void>(App::DocumentObject const&, App::Property const&) [inlined] std::__invoke_result<void (Gui::Document::*&)(App::DocumentObject const&, App::Property const&), Gui::Document*&, App::DocumentObject const&, App::Property const&>::type std::__invoke<void (Gui::Document::*&)(App::DocumentObject const&, App::Property const&), Gui::Document*&, App::DocumentObject const&, App::Property const&>((null)=0x000055555a6eed88, (null)=0x000055555a6eeca0, (null)=<unavailable>, __fn=<unavailable>) at invoke.h:96:40
    frame #28: 0x00007ffff6cd74fd libFreeCADGui.so`void std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>, std::_Placeholder<2>))(App::DocumentObject const&, App::Property const&)>::operator()<App::DocumentObject const&, App::Property const&, void>(App::DocumentObject const&, App::Property const&) [inlined] void std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>, std::_Placeholder<2>))(App::DocumentObject const&, App::Property const&)>::__call<void, App::DocumentObject const&, App::Property const&, 0ul, 1ul, 2ul>((null)=<unavailable>, __args=0x00007fffffffb2f0, this=<unavailable>) at functional:506:24
    frame #29: 0x00007ffff6cd74f9 libFreeCADGui.so`void std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>, std::_Placeholder<2>))(App::DocumentObject const&, App::Property const&)>::operator()<App::DocumentObject const&, App::Property const&, void>(this=<unavailable>, (null)=0x000055555a6eeca0, (null)=0x000055555a6eed88) at functional:591:32
    frame #30: 0x00007ffff6cd7517 libFreeCADGui.so`boost::detail::function::void_function_obj_invoker2<std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>, std::_Placeholder<2>))(App::DocumentObject const&, App::Property const&)>, void, App::DocumentObject const&, App::Property const&>::invoke(function_obj_ptr=<unavailable>, a0=<unavailable>, a1=<unavailable>) at function_template.hpp:158:11
    frame #31: 0x00007ffff5eb5ba3 libFreeCADApp.so`boost::function2<void, App::DocumentObject const&, App::Property const&>::operator()(this=<unavailable>, a0=<unavailable>, a1=<unavailable>) const at function_template.hpp:763:28
    frame #32: 0x00007ffff5eb5c65 libFreeCADApp.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>> const&) const [inlined] boost::signals2::detail::void_type boost::signals2::detail::call_with_tuple_args<boost::signals2::detail::void_type>::m_invoke<boost::function<void (App::DocumentObject const&, App::Property const&)>, 0u, 1u, App::DocumentObject const&, App::Property const&>((null)=0x0000000000000000, args=0x00007fffffffb5c0, (null)=<unavailable>, func=<unavailable>, this=<unavailable>) const at variadic_slot_invoker.hpp:105:15
    frame #33: 0x00007ffff5eb5c55 libFreeCADApp.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>> const&) const [inlined] boost::signals2::detail::void_type boost::signals2::detail::call_with_tuple_args<boost::signals2::detail::void_type>::operator()<boost::function<void (App::DocumentObject const&, App::Property const&)>, App::DocumentObject const&, App::Property const&, 2ul>((null)=<unavailable>, args=0x00007fffffffb5c0, func=<unavailable>, this=<unavailable>) const at variadic_slot_invoker.hpp:90:32
    frame #34: 0x00007ffff5eb5c55 libFreeCADApp.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(this=0x00007fffffffb5c0, connectionBody=<unavailable>) const at variadic_slot_invoker.hpp:133:53
    frame #35: 0x00007ffff5eb5c99 libFreeCADApp.so`boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>::dereference(this=0x00007fffffffb3b0) const at slot_call_iterator.hpp:110:43
    frame #36: 0x00007ffff5ed0f16 libFreeCADApp.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>) const [inlined] boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>::reference boost::iterators::iterator_core_access::dereference<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(f=0x00007fffffffb3b0) at iterator_facade.hpp:550:31
    frame #37: 0x00007ffff5ed0f0d libFreeCADApp.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>) const [inlined] boost::iterators::detail::iterator_facade_base<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>, boost::signals2::detail::void_type, boost::iterators::single_pass_traversal_tag, boost::signals2::detail::void_type const&, long, false, false>::operator*(this=0x00007fffffffb3b0) const at iterator_facade.hpp:656:53
    frame #38: 0x00007ffff5ed0f0d libFreeCADApp.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(this=<unavailable>, first=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffb3b0, last=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffb3d0) const at optional_last_value.hpp:57:13
    frame #39: 0x00007ffff5ed1190 libFreeCADApp.so`boost::signals2::detail::signal_impl<void (App::DocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(App::DocumentObject const&, App::Property const&) [inlined] void boost::signals2::detail::combiner_invoker<void>::operator()<boost::signals2::optional_last_value<void>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&, App::Property const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&, App::Property const&), boost::function<void (App::DocumentObject const&, App::Property const&)>>, boost::signals2::mutex>>>(last=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffb490, first=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&, const App::Property&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&, const App::Property&), boost::function<void(const App::DocumentObject&, const App::Property&)> >, boost::signals2::mutex> > @ 0x00007fffffffb470, combiner=<unavailable>, this=<unavailable>) const at result_type_wrapper.hpp:64:19
    frame #40: 0x00007ffff5ed1160 libFreeCADApp.so`boost::signals2::detail::signal_impl<void (App::DocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(this=<unavailable>, args#0=0x000055555a6eeca0, args#1=0x000055555a6eed88) at signal_template.hpp:243:13
    frame #41: 0x00007ffff5ed1266 libFreeCADApp.so`boost::signals2::signal<void (App::DocumentObject const&, App::Property const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&, App::Property const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&, App::Property const&)>, boost::signals2::mutex>::operator()(this=<unavailable>, args#0=0x000055555a6eeca0, args#1=0x000055555a6eed88) at signal_template.hpp:722:25
    frame #42: 0x00007ffff5e75308 libFreeCADApp.so`App::Document::onChangedProperty(this=<unavailable>, Who=0x000055555a6eeca0, What=0x000055555a6eed88) at Document.cpp:775:24
    frame #43: 0x00007ffff5ee445e libFreeCADApp.so`App::DocumentObject::onChanged(this=0x000055555a6eeca0, prop=0x000055555a6eed88) at DocumentObject.cpp:822:33
    frame #44: 0x00007fffdc078e4a Measure.so`App::FeaturePythonT<Measure::MeasureBase>::onChanged(this=0x000055555a6eeca0, prop=0x000055555a6eed88) at FeaturePython.h:340:28
    frame #45: 0x00007ffff5fdb59c libFreeCADApp.so`App::Property::hasSetValue(this=0x000055555a6eed88) at Property.cpp:230:26
    frame #46: 0x00007ffff602f2c3 libFreeCADApp.so`App::PropertyString::setValue(this=0x000055555a6eed88, newLabel="Center_of_Mass: ") at PropertyStandard.cpp:1413:16
    frame #47: 0x00007ffff6025ffa libFreeCADApp.so`App::PropertyString::setValue(this=<unavailable>, sString=<unavailable>) at PropertyStandard.cpp:1424:13
    frame #48: 0x00007fffbdcff9a0 MeasureGui.so`MeasureGui::ViewProviderMeasureBase::updateData(this=0x000055555a6ef2b0, prop=0x000055555a6eed88) at ViewProviderMeasureBase.cpp:310:28
    frame #49: 0x00007ffff70914c4 libFreeCADGui.so`Gui::ViewProviderDocumentObject::updateView(this=0x000055555a6ef2b0) at ViewProviderDocumentObject.cpp:324:19
    frame #50: 0x00007fffbdcffc45 MeasureGui.so`MeasureGui::ViewProviderMeasure::positionAnno(this=0x000055555a6ef2b0, measureObject=<unavailable>) at ViewProviderMeasureBase.cpp:555:15
    frame #51: 0x00007fffbdcff7a7 MeasureGui.so`MeasureGui::ViewProviderMeasureBase::attach(this=0x000055555a6ef2b0, pcObj=0x000055555a6eeca0) at ViewProviderMeasureBase.cpp:271:17
    frame #52: 0x00007ffff6cc2725 libFreeCADGui.so`Gui::Document::slotNewObject(this=0x0000555555ea4790, Obj=0x000055555a6eeca0) at Document.cpp:692:31
    frame #53: 0x00007ffff6cd748b libFreeCADGui.so`void std::__invoke_impl<void, void (Gui::Document::*&)(App::DocumentObject const&), Gui::Document*&, App::DocumentObject const&>((null)=__invoke_memfun_deref @ 0x00007fffffffc2a0, __f=<unavailable>, __t=<unavailable>, (null)=<unavailable>) at invoke.h:74:46
    frame #54: 0x00007ffff6cd74a9 libFreeCADGui.so`boost::detail::function::void_function_obj_invoker1<std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>))(App::DocumentObject const&)>, void, App::DocumentObject const&>::invoke(boost::detail::function::function_buffer&, App::DocumentObject const&) [inlined] std::__invoke_result<void (Gui::Document::*&)(App::DocumentObject const&), Gui::Document*&, App::DocumentObject const&>::type std::__invoke<void (Gui::Document::*&)(App::DocumentObject const&), Gui::Document*&, App::DocumentObject const&>((null)=0x000055555a6eeca0, (null)=<unavailable>, __fn=<unavailable>) at invoke.h:96:40
    frame #55: 0x00007ffff6cd74a4 libFreeCADGui.so`boost::detail::function::void_function_obj_invoker1<std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>))(App::DocumentObject const&)>, void, App::DocumentObject const&>::invoke(boost::detail::function::function_buffer&, App::DocumentObject const&) [inlined] void std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>))(App::DocumentObject const&)>::__call<void, App::DocumentObject const&, 0ul, 1ul>((null)=<unavailable>, __args=0x00007fffffffc2a8, this=<unavailable>) at functional:506:24
    frame #56: 0x00007ffff6cd74a0 libFreeCADGui.so`boost::detail::function::void_function_obj_invoker1<std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>))(App::DocumentObject const&)>, void, App::DocumentObject const&>::invoke(boost::detail::function::function_buffer&, App::DocumentObject const&) [inlined] void std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>))(App::DocumentObject const&)>::operator()<App::DocumentObject const&, void>((null)=0x000055555a6eeca0, this=<unavailable>) at functional:591:32
    frame #57: 0x00007ffff6cd749c libFreeCADGui.so`boost::detail::function::void_function_obj_invoker1<std::_Bind<void (Gui::Document::* (Gui::Document*, std::_Placeholder<1>))(App::DocumentObject const&)>, void, App::DocumentObject const&>::invoke(function_obj_ptr=<unavailable>, a0=0x000055555a6eeca0) at function_template.hpp:158:11
    frame #58: 0x00007ffff5eb6633 libFreeCADApp.so`boost::function1<void, App::DocumentObject const&>::operator()(this=<unavailable>, a0=<unavailable>) const at function_template.hpp:763:28
    frame #59: 0x00007ffff5eb66f1 libFreeCADApp.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>> const&) const [inlined] boost::signals2::detail::void_type boost::signals2::detail::call_with_tuple_args<boost::signals2::detail::void_type>::m_invoke<boost::function<void (App::DocumentObject const&)>, 0u, App::DocumentObject const&>((null)=0x0000000000000000, args=0x00007fffffffc560, (null)=<unavailable>, func=<unavailable>, this=<unavailable>) const at variadic_slot_invoker.hpp:105:15
    frame #60: 0x00007ffff5eb66e5 libFreeCADApp.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>> const&) const [inlined] boost::signals2::detail::void_type boost::signals2::detail::call_with_tuple_args<boost::signals2::detail::void_type>::operator()<boost::function<void (App::DocumentObject const&)>, App::DocumentObject const&, 1ul>((null)=<unavailable>, args=0x00007fffffffc560, func=<unavailable>, this=<unavailable>) const at variadic_slot_invoker.hpp:90:32
    frame #61: 0x00007ffff5eb66e5 libFreeCADApp.so`boost::signals2::detail::void_type boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>::operator()<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(this=0x00007fffffffc560, connectionBody=<unavailable>) const at variadic_slot_invoker.hpp:133:53
    frame #62: 0x00007ffff5eb6725 libFreeCADApp.so`boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>::dereference(this=0x00007fffffffc350) const at slot_call_iterator.hpp:110:43
    frame #63: 0x00007ffff5ed3e52 libFreeCADApp.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>) const [inlined] boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>::reference boost::iterators::iterator_core_access::dereference<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(f=0x00007fffffffc350) at iterator_facade.hpp:550:31
    frame #64: 0x00007ffff5ed3e49 libFreeCADApp.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>) const [inlined] boost::iterators::detail::iterator_facade_base<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>, boost::signals2::detail::void_type, boost::iterators::single_pass_traversal_tag, boost::signals2::detail::void_type const&, long, false, false>::operator*(this=0x00007fffffffc350) const at iterator_facade.hpp:656:53
    frame #65: 0x00007ffff5ed3e49 libFreeCADApp.so`void boost::signals2::optional_last_value<void>::operator()<boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(this=<unavailable>, first=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > @ 0x00007fffffffc350, last=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > @ 0x00007fffffffc370) const at optional_last_value.hpp:57:13
    frame #66: 0x00007ffff5ed40bf libFreeCADApp.so`boost::signals2::detail::signal_impl<void (App::DocumentObject const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&)>, boost::signals2::mutex>::operator()(App::DocumentObject const&) [inlined] void boost::signals2::detail::combiner_invoker<void>::operator()<boost::signals2::optional_last_value<void>, boost::signals2::detail::slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, App::DocumentObject const&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int>>, boost::signals2::slot<void (App::DocumentObject const&), boost::function<void (App::DocumentObject const&)>>, boost::signals2::mutex>>>(last=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > @ 0x00007fffffffc430, first=slot_call_iterator_t<boost::signals2::detail::variadic_slot_invoker<boost::signals2::detail::void_type, const App::DocumentObject&>, std::_List_iterator<boost::shared_ptr<boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > >, boost::signals2::detail::connection_body<std::pair<boost::signals2::detail::slot_meta_group, boost::optional<int> >, boost::signals2::slot<void(const App::DocumentObject&), boost::function<void(const App::DocumentObject&)> >, boost::signals2::mutex> > @ 0x00007fffffffc410, combiner=<unavailable>, this=<unavailable>) const at result_type_wrapper.hpp:64:19
    frame #67: 0x00007ffff5ed408f libFreeCADApp.so`boost::signals2::detail::signal_impl<void (App::DocumentObject const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&)>, boost::signals2::mutex>::operator()(this=<unavailable>, args#0=0x000055555a6eeca0) at signal_template.hpp:243:13
    frame #68: 0x00007ffff5ed418e libFreeCADApp.so`boost::signals2::signal<void (App::DocumentObject const&), boost::signals2::optional_last_value<void>, int, std::less<int>, boost::function<void (App::DocumentObject const&)>, boost::function<void (boost::signals2::connection const&, App::DocumentObject const&)>, boost::signals2::mutex>::operator()(this=<unavailable>, args#0=0x000055555a6eeca0) at signal_template.hpp:722:25
    frame #69: 0x00007ffff5e756ab libFreeCADApp.so`App::Document::addObject(this=0x0000555558c1bfc0, sType=<unavailable>, pObjectName="Center of Mass", isNew=true, viewType=<unavailable>, isPartial=false) at Document.cpp:3264:20
    frame #70: 0x00007ffff6e23f83 libFreeCADGui.so`Gui::TaskMeasure::update(this=0x000055555a665610) at TaskMeasure.cpp:220:48
    frame #71: 0x00007ffff6e243a5 libFreeCADGui.so`Gui::TaskMeasure::invoke(this=<unavailable>) at TaskMeasure.cpp:272:11
    frame #72: 0x00007ffff6e250e8 libFreeCADGui.so`QtPrivate::FunctorCall<QtPrivate::IndexesList<>, QtPrivate::List<>, void, void (Gui::TaskMeasure::*)()>::call(f=<unavailable>, o=<unavailable>, arg=<unavailable>) at qobjectdefs_impl.h:152:20
    frame #73: 0x00007ffff6e25126 libFreeCADGui.so`QtPrivate::QSlotObject<void (Gui::TaskMeasure::*)(), QtPrivate::List<>, void>::impl(int, QtPrivate::QSlotObjectBase*, QObject*, void**, bool*) [inlined] void QtPrivate::FunctionPointer<void (Gui::TaskMeasure::*)()>::call<QtPrivate::List<>, void>(arg=<unavailable>, o=<unavailable>, f=<unavailable>) at qobjectdefs_impl.h:185:95
    frame #74: 0x00007ffff6e2511e libFreeCADGui.so`QtPrivate::QSlotObject<void (Gui::TaskMeasure::*)(), QtPrivate::List<>, void>::impl(which=<unavailable>, this_=<unavailable>, r=<unavailable>, a=<unavailable>, ret=<unavailable>) at qobjectdefs_impl.h:418:49
    frame #75: 0x00007ffff3ed3364 libQt5Core.so.5`QMetaCallEvent::placeMetaCall(QObject*) [inlined] QtPrivate::QSlotObjectBase::call(a=<unavailable>, r=0x000055555a665610, this=<unavailable>) at qobjectdefs_impl.h:398:57
    frame #76: 0x00007ffff3ed3350 libQt5Core.so.5`QMetaCallEvent::placeMetaCall(this=0x000055555a6c20e0, object=0x000055555a665610) at qobject.cpp:633:25
    frame #77: 0x00007ffff3edaefe libQt5Core.so.5`QObject::event(this=0x000055555a665610, e=0x000055555a6c20e0) at qobject.cpp:1347:31
    frame #78: 0x00007ffff4ae1813 libQt5Widgets.so.5`QApplicationPrivate::notify_helper(this=0x000055555593a2e0, receiver=0x000055555a665610, e=0x000055555a6c20e0) at qapplication.cpp:3640:31
    frame #79: 0x00007ffff4aea1be libQt5Widgets.so.5`QApplication::notify(this=0x00007fffffffd7c0, receiver=0x000055555a665610, e=0x000055555a6c20e0) at qapplication.cpp:2980:31
    frame #80: 0x00007ffff6d16222 libFreeCADGui.so`Gui::GUIApplication::notify(this=0x00007fffffffd7c0, receiver=0x000055555a665610, event=0x000055555a6c20e0) at GuiApplication.cpp:83:40
    frame #81: 0x00007ffff3e9ef19 libQt5Core.so.5`QCoreApplication::notifyInternal2(receiver=0x000055555a665610, event=0x000055555a6c20e0) at qcoreapplication.cpp:1064:24
    frame #82: 0x00007ffff3e9f196 libQt5Core.so.5`QCoreApplication::sendEvent(receiver=<unavailable>, event=<unavailable>) at qcoreapplication.cpp:1462:27
    frame #83: 0x00007ffff3ea2feb libQt5Core.so.5`QCoreApplicationPrivate::sendPostedEvents(receiver=0x0000000000000000, event_type=0, data=0x000055555570e850) at qcoreapplication.cpp:1821:36
    frame #84: 0x00007ffff3ea3303 libQt5Core.so.5`QCoreApplication::sendPostedEvents(receiver=0x0000000000000000, event_type=0) at qcoreapplication.cpp:1680:46
    frame #85: 0x00007ffff3f0c6af libQt5Core.so.5`postEventSourceDispatch(s=0x0000555555876230, (null)=<unavailable>, (null)=<unavailable>) at qeventdispatcher_glib.cpp:277:39
    frame #86: 0x00007ffff311bd3b libglib-2.0.so.0`g_main_context_dispatch + 619
    frame #87: 0x00007ffff31712b8 libglib-2.0.so.0`___lldb_unnamed_symbol2709 + 488
    frame #88: 0x00007ffff31193e3 libglib-2.0.so.0`g_main_context_iteration + 51
    frame #89: 0x00007ffff3f0bfbf libQt5Core.so.5`QEventDispatcherGlib::processEvents(this=0x0000555555873b60, flags=(i = 36)) at qeventdispatcher_glib.cpp:423:43
    frame #90: 0x00007fffee068826 libQt5XcbQpa.so.5`QXcbGlibEventDispatcher::processEvents(this=<unavailable>, flags=<unavailable>) at qxcbeventdispatcher.cpp:143:47
    frame #91: 0x00007ffff3e9c89b libQt5Core.so.5`QEventLoop::processEvents(this=0x00007fffffffd2c0, flags=<unavailable>) at qeventloop.cpp:142:68
    frame #92: 0x00007ffff3e9cf3c libQt5Core.so.5`QEventLoop::exec(this=0x00007fffffffd2c0, flags=(i = 0)) at qeventloop.cpp:235:22
    frame #93: 0x00007ffff3ea78df libQt5Core.so.5`QCoreApplication::exec() at qcoreapplication.cpp:1375:36
    frame #94: 0x00007ffff4224a24 libQt5Gui.so.5`QGuiApplication::exec() at qguiapplication.cpp:1870:34
    frame #95: 0x00007ffff4ae177d libQt5Widgets.so.5`QApplication::exec() at qapplication.cpp:2832:33
    frame #96: 0x00007ffff6c6993b libFreeCADGui.so`(anonymous namespace)::tryRunEventLoop(mainApp=0x00007fffffffd7c0) at Application.cpp:2042:23
    frame #97: 0x00007ffff6c69c04 libFreeCADGui.so`(anonymous namespace)::runEventLoop(mainApp=0x00007fffffffd7c0) at Application.cpp:2062:24
    frame #98: 0x00007ffff6c6da7e libFreeCADGui.so`Gui::Application::runApplication() at Application.cpp:2139:17
    frame #99: 0x000055555556a3a5 FreeCAD`main(argc=<unavailable>, argv=<unavailable>) at MainGui.cpp:278:45
    frame #100: 0x00007ffff3229d90 libc.so.6`__libc_start_call_main(main=(FreeCAD`main at MainGui.cpp:105:1), argc=1, argv=0x00007fffffffdd98) at libc_start_call_main.h:58:16
    frame #101: 0x00007ffff3229e40 libc.so.6`__libc_start_main_impl(main=(FreeCAD`main at MainGui.cpp:105:1), argc=1, argv=0x00007fffffffdd98, init=<unavailable>, fini=<unavailable>, rtld_fini=<unavailable>, stack_end=0x00007fffffffdd88) at libc-start.c:392:3
    frame #102: 0x0000555555569c05 FreeCAD`_start + 37
(lldb)

OS: Ubuntu 22.04.3 LTS (KDE/plasma)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37303 (Git)
Build type: Debug
Branch: main
Hash: 869cb1f83b5f92ee134dafde46c9c5e0dceb8889
Python 3.10.12, Qt 5.15.12, Coin 4.0.0, Vtk 9.1.0, OCC 7.5.1
Locale: English/United States (en_US)

One may notice that it is failing assert causes the segfault.

@furgo16
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furgo16 commented May 19, 2024

At this point, I cannot use the Measure tool. It crashes FreeCAD every time I click on it. Let me know if I can provide more info or help testing.

@furgo16
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furgo16 commented May 19, 2024

As a workaround, disabling DAGView as per https://wiki.freecad.org/DAG_view stops the Measure tool from crashing. Thanks xtemp09 for the hint, I can now continue working on my model.

@maxwxyz
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maxwxyz commented May 19, 2024

@hlorus can you reproduce this?

@maxwxyz maxwxyz added Bug This issue or PR is related to a bug and removed Missing: confirmation Missing confirmation from other testers labels May 19, 2024
@hlorus
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hlorus commented May 20, 2024

@hlorus can you reproduce this?

Yes i can reproduce it when enabling DAG View, i'll have to investigate.

@krushia
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krushia commented May 23, 2024

Introduced sometime between these builds:

(Last weekly without crash)
Version: 0.22.0dev.37249 (Git) AppImage
Hash: 3acbc56

(First weekly with crash)
Version: 0.22.0dev.37302 (Git) AppImage
Hash: 0e24e12

@hlorus
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hlorus commented May 25, 2024

Thanks @krushia! It was introduced in 2b9e9d6, more specifically line 310 seems to trigger the crash.

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@krushia @maxwxyz @xtemp09 @hlorus @furgo16