Arch Linux

Please provide traces and information about what drivers you're using.

Update: Also happens in KDE SC 4.5.



Backtrace information from KDE's bug report utility:

---------------------------------------------------
Application: KWin (kwin), signal: Segmentation fault
[KCrash Handler]
#6 0x00007f086b7b7470 in ?? () from /usr/lib/libGL.so.1
#7 0x00007f086b79272d in ?? () from /usr/lib/libGL.so.1
#8 0x00007f086dd525e1 in KWin::SceneOpenGL::waitSync() () from /usr/lib/libkdeinit4_kwin.so
#9 0x00007f086dd56b20 in KWin::SceneOpenGL::flushBuffer(int, QRegion) () from /usr/lib/libkdeinit4_kwin.so
#10 0x00007f086dd5733a in KWin::SceneOpenGL::paint(QRegion, QList<KWin::Toplevel*>) () from /usr/lib/libkdeinit4_kwin.so
#11 0x00007f086dd4348c in KWin::Workspace::performCompositing() () from /usr/lib/libkdeinit4_kwin.so
#12 0x00007f086dcccafd in KWin::Workspace::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdeinit4_kwin.so
#13 0x00007f086a31dd9f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
#14 0x00007f086a31b35e in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#15 0x00007f08694e5854 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#16 0x00007f08694e993a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x00007f086d52f146 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#18 0x00007f086a309d3c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#19 0x00007f086a3351d2 in ?? () from /usr/lib/libQtCore.so.4
#20 0x00007f086a335310 in QEventDispatcherUNIX::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#21 0x00007f0869585ea2 in ?? () from /usr/lib/libQtGui.so.4
#22 0x00007f086a309122 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#23 0x00007f086a30935c in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#24 0x00007f086a30d76b in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#25 0x00007f086dce7138 in kdemain () from /usr/lib/libkdeinit4_kwin.so
#26 0x00007f086d95ac4d in __libc_start_main () from /lib/libc.so.6
#27 0x00000000004005c9 in _start ()
---------------------------------------------------

I don't see a frame zero in the GDB output but it's the same. I can only use GDB in non-X console, and I don't quite know how to copy/output that into something.


As I told in the bug report:
> extra/xf86-video-ati 6.13.1-1
> extra/libgl 7.8.2-1
> extra/mesa 7.8.2-1

A bug report was filled upstream:
https://bugs.freedesktop.org/show_bug.cgi?id=29513

Can you try to rebuilt mesa-7.8.2-1 with debugging symbols ? 'options=('!strip')'

This should produce a more complete libgl backtrace.

Hi Laurent,

Yep, no problem. I'll try to give you the detailed GDB backtrace, by the end of day.

OK, So I've recompiled mesa and installed the new packages. Now it only gives a segfault every 2 times, or at least not at the first.

I'm now also having doubts regarding the kernel driver or (god forsake HW failure), as I leave this laptop at home as my server, when I got home I does not respond to anything.


In annex is the backtrace generated by KDE's bug report tool. Hope it helps

I forgot, I've modified the compile flags to:

CFLAGS="-g -march=x86-64 -mtune=generic -O0 -pipe"
CXXFLAGS="-g -march=x86-64 -mtune=generic -O0 -pipe"

As my wife is currently waiting for me to helper her clean the house, I've reduced the optimization level to speed things up a bit :)

Can you test if the attached package fix the problem ?

The problem still persists.

In annex is the new backtrace.

Can you try with that patch ?
(replace the file in the 'patches' directory with this one)

Digging a bit in kwin/scene_opengl.cpp source code, you should avoid the segfault if you disable the vsync option ('Use Vsync' option)

Again, same problem :(

Edit: This will be my last try tonight, I've got to get up early tomorrow.

Sorry, I've just now have seen your 21:16GMT post, I haven't tried.

If I have the time, I'll bring this laptop with me to the weekend and dig into the code, it's just been a very busy week :(

Do you have any more pointers/hints where should I search?

You can always test with the mesa git tree, a repo is available with some instructions here:
https://bbs.archlinux.org/viewtopic.php?id=79509&p=1

So i could report the results upstream

Hi, I've tried with mesa-git AUR packages the other day, and still the problem maintains.

How's state with new Xorg, new Mesa and new AMD/Ati driver in testing?

Sorry, I no longer have this laptop, so I'm unable to test this issue any longer.