Gui: Crash on Python Console autocompletion Qt6/Pyside6

[pieterhijma]

Is there an existing issue for this?

• I have searched the existing issues

Problem description

The autocompletion popup in the Python console causes a segfault with PySide6/Qt6.

To reproduce, type the following in the Python console:

from PySide import QtNetwork
QtNetwork.QNetworkRequest.

On typing the ., the console tries to show a popup with autocompletion, but it crashes before it can do that:

Stacktrace:

#0  /usr/lib/libc.so.6(+0x3cae0) [0x7a1d61250ae0]
#1  /usr/lib/libpython3.12.so.1.0(PyFrame_GetCode+0x4) [0x7a1d63e6ec14]
#2  /usr/lib/libshiboken6.cpython-312-x86_64-linux-gnu.so.6.7(+0x32656) [0x7a1d63bc0656]
#3  /usr/lib/libshiboken6.cpython-312-x86_64-linux-gnu.so.6.7(mangled_type_getattro+0x135) [0x7a1d63bc0a15]
#4  /usr/lib/libpython3.12.so.1.0(PyObject_GetAttrString+0xb3) [0x7a1d63dad623]
#5  0x7a1d6757747a in Py::Object::getAttr(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) const from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0x36
#6  0x7a1d67b125c5 in Gui::CallTipsList::extractTipsFromObject(Py::Object&, Py::List&, QMap<QString, Gui::CallTip>&) const from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0xf3
#7  0x7a1d67b12159 in Gui::CallTipsList::extractTips(QString const&) const from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0xb4f
#8  0x7a1d67b13f2a in Gui::CallTipsList::showTips(QString const&) from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0x70e
#9  0x7a1d67b26c79 in Gui::PythonConsole::keyPressEvent(QKeyEvent*) from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0x62f
#10  0x7a1d6294950e in QWidget::event(QEvent*) from /usr/lib/libQt6Widgets.so.6+0x62e
#11  0x7a1d629dbf6a in QFrame::event(QEvent*) from /usr/lib/libQt6Widgets.so.6+0x3a
#12  0x7a1d628fc44d in QApplicationPrivate::notify_helper(QObject*, QEvent*) from /usr/lib/libQt6Widgets.so.6+0x4d
#13  0x7a1d6290187b in QApplication::notify(QObject*, QEvent*) from /usr/lib/libQt6Widgets.so.6+0x124b
#14  0x7a1d677196c4 in Gui::GUIApplication::notify(QObject*, QEvent*) from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0x114
#15  0x7a1d6193fe18 in QCoreApplication::notifyInternal2(QObject*, QEvent*) from /usr/lib/libQt6Core.so.6+0x158
#16  /usr/lib/libQt6Widgets.so.6(+0x160336) [0x7a1d62960336]
#17  0x7a1d628fc44d in QApplicationPrivate::notify_helper(QObject*, QEvent*) from /usr/lib/libQt6Widgets.so.6+0x4d
#18  0x7a1d677196c4 in Gui::GUIApplication::notify(QObject*, QEvent*) from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0x114
#19  0x7a1d6193fe18 in QCoreApplication::notifyInternal2(QObject*, QEvent*) from /usr/lib/libQt6Core.so.6+0x158
#20  0x7a1d61f77a30 in QGuiApplicationPrivate::processKeyEvent(QWindowSystemInterfacePrivate::KeyEvent*) from /usr/lib/libQt6Gui.so.6+0x330
#21  0x7a1d61fe8dcc in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) from /usr/lib/libQt6Gui.so.6+0x2ac
#22  /usr/lib/qt6/plugins/platforms/../../../libQt6XcbQpa.so.6(+0x4dcb7) [0x7a1d5d07ccb7]
#23  /usr/lib/libglib-2.0.so.0(+0x5ca89) [0x7a1d5e70ea89]
#24  /usr/lib/libglib-2.0.so.0(+0xbe9b7) [0x7a1d5e7709b7]
#25  /usr/lib/libglib-2.0.so.0(g_main_context_iteration+0x35) [0x7a1d5e70df95]
#26  0x7a1d61b93389 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) from /usr/lib/libQt6Core.so.6+0x89
#27  0x7a1d61948350 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) from /usr/lib/libQt6Core.so.6+0x1b0
#28  0x7a1d61943c1d in QCoreApplication::exec() from /usr/lib/libQt6Core.so.6+0x8d
#29  /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so(+0x1372470) [0x7a1d67572470]
#30  /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so(+0x13727bb) [0x7a1d675727bb]
#31  0x7a1d67572b74 in Gui::Application::runApplication() from /home/pieter/build-freecad-main-debug/lib/libFreeCADGui.so+0x22e
#32  ./bin/FreeCAD(+0x26579) [0x607c1498b579]
#33  /usr/lib/libc.so.6(+0x25c88) [0x7a1d61239c88]
#34  /usr/lib/libc.so.6(__libc_start_main+0x8c) [0x7a1d61239d4c]
#35  ./bin/FreeCAD(+0x25745) [0x607c1498a745]

Full version info

OS: Arch Linux
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37347 (Git)
Build type: DEBUG
Branch: main
Hash: 18c85a58aeb0fa9d69fae1b70de85d7fff9e0eb3
Python 3.12.3, Qt 6.7.0, Coin 4.0.2, Vtk , OCC 7.7.2
Locale: English/United States (en_US)

Subproject(s) affected?

Other (specify in description)

Anything else?

This seems related: #10974

Code of Conduct

• I agree to follow this project's Code of Conduct

[pieterhijma]

@chennes, we briefly discussed this and mentioned you had a Qt debug compilation, so let's hope you can reproduce this.

[maxwxyz]

related: #13303 ?

[pieterhijma]

Yes, I think so.

[wwmayer]

Looking at the stack trace this doesn't look like it's related to Qt6 but rather to Python 3.12.

It perfectly works with

OS: Ubuntu 22.04.4 LTS (XFCE/xubuntu)
Word size of FreeCAD: 64-bit
Version: 0.22.0dev.37369 (Git)
Build type: Release
Branch: main
Hash: f814ef63aa6dce9067b507da3fc34c8cc017d882
Python 3.10.12, Qt 6.2.4, Coin 4.0.0, Vtk 7.1.1, OCC 7.5.1
Locale: German/Germany (de_DE)