Bug 405989 – >=dev-qt/qtgui-4.8[egl]: some Qt apps crash with SIGSEGV in XVisualIDFromVisual from /usr/lib64/libX11.so.6

• Product: Gentoo Linux
• Status: RESOLVED CANTFIX

[Description jannis 2012-02-27 07:54:23 UTC]

With x11-libs/qt-gui-4.8.0-r2 installed and using the default "raster" graphics backend, some Qt apps crash. Under them mythfrontend (from overlay) and qtdemo (from portage tree). On KDE startup there is also a crash-reporting window but I can't remember right now.
gdb backtrace of crashing qtdemo and "emerge --info" will be attached.
Graphics card is an AMD Radeon HD 4670 using the open-source r600g (Gallium3D) driver with mesa-8.0.

Procedure suggestions for further tracking the issue down are very welcome.

Reproducible: Always

[Comment 1 jannis 2012-02-27 07:55:35 UTC]

Created attachment 303455 [details]
gdb backtrace

[Comment 2 jannis 2012-02-27 07:55:50 UTC]

Created attachment 303457 [details]
emerge --info

[Comment 3 jannis 2012-02-27 08:06:21 UTC]

Might be related to:
https://bugs.kde.org/show_bug.cgi?id=198294
https://bugreports.qt-project.org/browse/QTBUG-12836

[Comment 4 jannis 2012-02-27 08:45:22 UTC]

Updated mesa to 8.0.1: No change.

Tried all the different Qt graphic systems:
- "native": no change - qtdemo crashes
- "opengl": KDE doesn't even start - crash
- "openvg": KDE loads but dosn't display anything
- "render" (default): KDE works - qtdemo crashes

[Comment 5 Davide Pesavento (RETIRED) 2012-02-28 10:49:32 UTC]

(In reply to comment #3)
> Might be related to:
> https://bugs.kde.org/show_bug.cgi?id=198294
> https://bugreports.qt-project.org/browse/QTBUG-12836

Yep, the backtrace is very similar to the one in QTBUG-12836.

Please post the output of 'emerge -pv qt-gui'

[Comment 6 jannis 2012-02-28 17:27:42 UTC]

Created attachment 303609 [details]
output of "emerge -pv qt-gui qt-demo"

[Comment 7 Davide Pesavento (RETIRED) 2012-02-28 17:39:16 UTC]

Is the crash reproducible with USE="-egl" in qt-gui?

[Comment 8 jannis 2012-02-28 17:53:17 UTC]

(In reply to comment #7)
> Is the crash reproducible with USE="-egl" in qt-gui?

No, it's not. I rebuilt qt-gui and qt-opengl with USE="-egl" and it worked afterwards (re-login wasn't needed).

I just found my qt-project.org login details so I could post a reference to this bug here in their tracker. Maybe could speed up upstream-development?

I'm just trying to figure out why I had +egl in first place... Will post here as soon as I remember :)

[Comment 9 Davide Pesavento (RETIRED) 2012-02-28 19:05:27 UTC]

(In reply to comment #8)
> (In reply to comment #7)
> > Is the crash reproducible with USE="-egl" in qt-gui?
> 
> No, it's not. I rebuilt qt-gui and qt-opengl with USE="-egl" and it worked
> afterwards (re-login wasn't needed).
> 

Ok, thanks for testing.

> I just found my qt-project.org login details so I could post a reference to
> this bug here in their tracker. Maybe could speed up upstream-development?
> 

Please do, upstream bug seems dead since August 2010 :-/

[Comment 10 jannis 2012-02-28 19:41:03 UTC]

Very welcome :) Thanks for the hint with USE="-egl". Notified upstream. Let's see what happens, I'm happy with -egl. I assume I just wanted to test s.th. and forgot about it then ...

[Comment 11 Davide Pesavento (RETIRED) 2012-03-26 23:57:51 UTC]

*** Bug 409805 has been marked as a duplicate of this bug. ***

[Comment 12 Davide Pesavento (RETIRED) 2012-03-30 10:25:14 UTC]

Please retry with Qt 4.8.1 if you can.

[Comment 13 jannis 2012-03-31 07:05:05 UTC]

Created attachment 307251 [details]
Still crashing with qt-4.8.1

I can still reproduce this with Qt-4.8.1. Everything is fine with USE="-egl" on qt-gui and qt-opengl but crashed with USE="egl". gdb backtrace is attached.

Just like the user in bug#409805 I use the r600g-driver (now with mesa-8.0.2). I wanted to test the "classic" R600-driver but I don't have this option anymore:

64bit r300 (Radeon R300-R500)
  [1]   gallium *
64bit r600 (Radeon R600-R700, Evergreen, Northern Islands)
  [1]   gallium *
64bit sw (Software renderer)
  [1]   classic
  [2]   gallium *

Maybe I need to re-check USE-flags on mesa

[Comment 14 Davide Pesavento (RETIRED) 2015-06-14 14:26:31 UTC]

Qt4 will not have any more releases after 4.8.7, except for security fixes.  Therefore the chances of getting this bug fixed upstream are practically zero, sorry.