SIGSEV with --mm:orc and --threads:on

[termermc]

Descrption

Prologue applications SIGSEV when using ORC with threads enabled.

Test program

import prologue

proc hello*(ctx: Context) {.async.} =
  resp "<h1>Hello, Prologue!</h1>"

let app = newApp(settings = newSettings(debug = false))
app.get("/", hello)
app.run()

Command

nim r -d:release --mm:orc --threads:on src/prologuetest.nim

Steps to reproduce

• Use the above code and command (adapted to your setup) to execute the program.
• Send requests to the server concurrently.
  • I used bombardier with the command bombardier -c 3 -d 30s http://localhost:8080 to send requests with 3 connections for a maximum if 30 seconds (it crashed in a second or two, well before the 30s mark)
  • You can use wrk instead of bombardier if you want
• Watch it SIGSEV

Command Output

This is the output of running the program, including when I started hitting it with requests:

/t/prologuetest ❯❯❯ nim r -d:release --mm:orc --threads:on src/prologuetest.nim
Hint: used config file '/home/termer/.choosenim/toolchains/nim-1.6.10/config/nim.cfg' [Conf]
Hint: used config file '/home/termer/.choosenim/toolchains/nim-1.6.10/config/config.nims' [Conf]
Hint: used config file '/tmp/prologuetest/config.nims' [Conf]
Hint: gc: orc; threads: on; opt: speed; options: -d:release
19464 lines; 0.019s; 16.555MiB peakmem; proj: /tmp/prologuetest/src/prologuetest.nim; out: /home/termer/.cache/nim/prologuetest_r/prologuetest_2C3ECAC42048EEF172BBC7FB007EB4C0E8841BAD [SuccessX]
Hint: /home/termer/.cache/nim/prologuetest_r/prologuetest_2C3ECAC42048EEF172BBC7FB007EB4C0E8841BAD  [Exec]
SIGSEGV: Illegal storage access. (Attempt to read from nil?)
Error: execution of an external program failed: '/home/termer/.cache/nim/prologuetest_r/prologuetest_2C3ECAC42048EEF172BBC7FB007EB4C0E8841BAD '

Notes

This is not an httpx or httpbeast problem, as running their benchmark programs with the same options and slamming them with concurrent requests does not cause any crashes.

[ITwrx]

Just as another data point: I wrote a website (portfolio type with admin area for adding projects, blog posts, etc) using Prologue a couple years ago, and once deployed, it was crashing with this error, IIRC. I pulled off of nim for a year or so after that due to being burned, and not seeing a suitable alternative.