Application: kwin (4.11.6)
KDE Platform Version: 4.12.90
Qt Version: 4.8.6
Operating System: Linux 3.13.0-18-generic x86_64
Distribution: Ubuntu Trusty Tahr (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
Pressed „Re-enable OpenGl detection” in the Desktop Effects KCM.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  xcb_glx_query_server_string_string_length (R=R@entry=0x0) at glx.c:2460
#7  0x00007fc5dc690ec5 in __glXQueryServerString (dpy=dpy@entry=0x1d952f0, opcode=<optimized out>, screen=screen@entry=0, name=name@entry=2) at ../../../../src/glx/glx_query.c:55
#8  0x00007fc5dc67244e in AllocAndFetchScreenConfigs (priv=0x1f5d070, dpy=0x1d952f0) at ../../../../src/glx/glxext.c:764
#9  __glXInitialize (dpy=0x1d952f0) at ../../../../src/glx/glxext.c:887
#10 0x00007fc5dc66e731 in glXQueryVersion (dpy=<optimized out>, major=0x7fffbf43b828, minor=0x7fffbf43b82c) at ../../../../src/glx/glxcmds.c:487
#11 0x00007fc5dc8c982d in KWin::initGLX () at ../../../kwin/libkwineffects/kwinglutils.cpp:76
#12 0x00007fc5e1ba0e94 in KWin::GlxBackend::init (this=0x1fa8ac0) at ../../kwin/glxbackend.cpp:80
#13 0x00007fc5e1b9bddc in KWin::SceneOpenGL::createScene () at ../../kwin/scene_opengl.cpp:222
#14 0x00007fc5e1b80395 in KWin::Compositor::slotCompositingOptionsInitialized (this=this@entry=0x1f32d60) at ../../kwin/composite.cpp:202
#15 0x00007fc5e1b8071d in KWin::Compositor::setup (this=0x1f32d60) at ../../kwin/composite.cpp:161
#16 0x00007fc5e1b80ac5 in setup (this=0x1f32d60) at ../../kwin/composite.cpp:403
#17 KWin::Compositor::slotConfigChanged (this=0x1f32d60) at ../../kwin/composite.cpp:398
#18 0x00007fc5e1b07b15 in KWin::Compositor::qt_static_metacall (_o=<optimized out>, _id=<optimized out>, _a=<optimized out>, _c=<optimized out>) at moc_composite.cpp:199
#19 0x00007fc5dbbc487a in QMetaObject::activate (sender=sender@entry=0x1ee9060, m=m@entry=0x7fc5e1e51f60 <KWin::Workspace::staticMetaObject>, local_signal_index=local_signal_index@entry=11, argv=argv@entry=0x0) at kernel/qobject.cpp:3539
#20 0x00007fc5e1b1833f in configChanged (this=0x1ee9060) at ./workspace.moc:415
#21 KWin::Workspace::slotReconfigure (this=0x1ee9060) at ../../kwin/workspace.cpp:799
#22 0x00007fc5e1b1893d in KWin::Workspace::qt_static_metacall (_o=0x1ee9060, _id=0, _a=0x1d68808, _c=<optimized out>) at ./workspace.moc:271
#23 0x00007fc5dbbc487a in QMetaObject::activate (sender=0x1ee9190, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3539
#24 0x00007fc5dbbc8a31 in QObject::event (this=0x1ee9190, e=<optimized out>) at kernel/qobject.cpp:1156
#25 0x00007fc5daf49e2c in QApplicationPrivate::notify_helper (this=this@entry=0x1d60920, receiver=receiver@entry=0x1ee9190, e=e@entry=0x7fffbf43c160) at kernel/qapplication.cpp:4567
#26 0x00007fc5daf504a0 in QApplication::notify (this=this@entry=0x7fffbf43c630, receiver=receiver@entry=0x1ee9190, e=e@entry=0x7fffbf43c160) at kernel/qapplication.cpp:4353
#27 0x00007fc5e0435b9a in KApplication::notify (this=0x7fffbf43c630, receiver=0x1ee9190, event=0x7fffbf43c160) at ../../kdeui/kernel/kapplication.cpp:311
#28 0x00007fc5dbbb04dd in QCoreApplication::notifyInternal (this=0x7fffbf43c630, receiver=0x1ee9190, event=0x7fffbf43c160) at kernel/qcoreapplication.cpp:953
#29 0x00007fc5dbbe0323 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#30 QTimerInfoList::activateTimers (this=0x1d61548) at kernel/qeventdispatcher_unix.cpp:621
#31 0x00007fc5dbbe03a0 in QEventDispatcherUNIX::activateTimers (this=this@entry=0x1d05af0) at kernel/qeventdispatcher_unix.cpp:878
#32 0x00007fc5dbbe0d20 in QEventDispatcherUNIX::processEvents (this=this@entry=0x1d05af0, flags=...) at kernel/qeventdispatcher_unix.cpp:940
#33 0x00007fc5dafec4d6 in QEventDispatcherX11::processEvents (this=0x1d05af0, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#34 0x00007fc5dbbaf0af in QEventLoop::processEvents (this=this@entry=0x7fffbf43c4a0, flags=...) at kernel/qeventloop.cpp:149
#35 0x00007fc5dbbaf3a5 in QEventLoop::exec (this=this@entry=0x7fffbf43c4a0, flags=...) at kernel/qeventloop.cpp:204
#36 0x00007fc5dbbb4b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#37 0x00007fc5daf4837c in QApplication::exec () at kernel/qapplication.cpp:3828
#38 0x00007fc5e1b38856 in kdemain (argc=1, argv=0x7fffbf43c778) at ../../kwin/main.cpp:597
#39 0x00007fc5e1718ec5 in __libc_start_main (main=0x4006d0 <main(int, char**)>, argc=1, argv=0x7fffbf43c778, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffbf43c768) at libc-start.c:285
#40 0x00000000004006fe in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 213182.

Possible duplicates by query: bug 324580, bug 323298.

Reported using DrKonqi