Application: kwin (4.6.5 (4.6.5))
KDE Platform Version: 4.6.5 (4.6.5)
Qt Version: 4.7.2
Operating System: Linux 2.6.38-11-generic i686
Distribution: Ubuntu 11.04

-- Information about the crash:
- What I was doing when the application crashed:
Playing Urban Terror with standard settings. Open GL Quake 3 engine game. 
- Unusual behavior I noticed:
Sometimes often on mine laptop when i play the game screen goes blinking, and kwin crashes everytime after i play it.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7828720 (LWP 2243))]

Thread 3 (Thread 0xb27a3b70 (LWP 2248)):
#0  0x00f05416 in __kernel_vsyscall ()
#1  0x001d9681 in select () from /lib/i386-linux-gnu/libc.so.6
#2  0x0311b38b in qt_safe_select (nfds=15, fdread=0xa4bb0e0, fdwrite=0xa4bb2f4, fdexcept=0xa4bb508, orig_timeout=0x0) at kernel/qcore_unix.cpp:82
#3  0x0311f6e9 in QEventDispatcherUNIX::select (this=0xa3fc560, nfds=15, readfds=0xa4bb0e0, writefds=0xa4bb2f4, exceptfds=0xa4bb508, timeout=0x0) at kernel/qeventdispatcher_unix.cpp:632
#4  0x0312066b in QEventDispatcherUNIXPrivate::doSelect (this=0xa4bafe8, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:219
#5  0x03121326 in QEventDispatcherUNIX::processEvents (this=0xa3fc560, flags=...) at kernel/qeventdispatcher_unix.cpp:919
#6  0x030f0289 in QEventLoop::processEvents (this=0xb27a3280, flags=...) at kernel/qeventloop.cpp:149
#7  0x030f0522 in QEventLoop::exec (this=0xb27a3280, flags=...) at kernel/qeventloop.cpp:201
#8  0x02ffa2a0 in QThread::exec (this=0xa264ba8) at thread/qthread.cpp:492
#9  0x030d1fdb in QInotifyFileSystemWatcherEngine::run (this=0xa264ba8) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x02ffcda2 in QThreadPrivate::start (arg=0xa264ba8) at thread/qthread_unix.cpp:320
#11 0x00d33e99 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0x001e073e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 2 (Thread 0xb1fa2b70 (LWP 2249)):
#0  0x00f05416 in __kernel_vsyscall ()
#1  0x00d3848c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0x001ee3fd in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0x0108d817 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x11a11c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#4  0x0108d851 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x11a11c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#5  0x00d33e99 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0x001e073e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb7828720 (LWP 2243)):
[KCrash Handler]
#7  intel_region_buffer (intel=0x9e72700, region=0x0, flag=2) at intel_regions.c:514
#8  0x02da9ce2 in intelClearWithBlit (ctx=0x9e72700, mask=2) at intel_blit.c:262
#9  0x02dac4c0 in intelClear (ctx=0x9e72700, mask=2) at intel_clear.c:177
#10 0x05089512 in _mesa_Clear (mask=<value optimized out>) at main/clear.c:241
#11 0x00b7f77b in KWin::SceneOpenGL::paintBackground (this=0x9d9abd8, region=...) at ../../kwin/scene_opengl.cpp:921
#12 0x00b76492 in KWin::Scene::paintGenericScreen (this=0x9d9abd8, orig_mask=40) at ../../kwin/scene.cpp:188
#13 0x00b7f961 in KWin::SceneOpenGL::paintGenericScreen (this=0x9d9abd8, mask=40, data=...) at ../../kwin/scene_opengl.cpp:909
#14 0x00b736f0 in KWin::Scene::finalPaintScreen (this=0x9d9abd8, mask=40, region=..., data=...) at ../../kwin/scene.cpp:178
#15 0x00b9220c in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=40, region=..., data=...) at ../../kwin/effects.cpp:173
#16 0x05522159 in KWin::StartupFeedbackEffect::paintScreen (this=0xa3ad640, mask=40, region=..., data=...) at ../../../kwin/effects/startupfeedback/startupfeedback.cpp:166
#17 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=40, region=..., data=...) at ../../kwin/effects.cpp:169
#18 0x00e40256 in KWin::Effect::paintScreen (this=0xa1dbe90, mask=40, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#19 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=40, region=..., data=...) at ../../kwin/effects.cpp:169
#20 0x054c40af in KWin::LogoutEffect::paintScreen (this=0xa2f0420, mask=40, region=..., data=...) at ../../../kwin/effects/logout/logout.cpp:207
#21 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=40, region=..., data=...) at ../../kwin/effects.cpp:169
#22 0x054dfb40 in KWin::ShadowEffect::paintScreen (this=0xa3a0d38, mask=40, region=..., data=...) at ../../../kwin/effects/shadow/shadow.cpp:189
#23 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=40, region=..., data=...) at ../../kwin/effects.cpp:169
#24 0x054f4043 in KWin::BlurEffect::paintScreen (this=0xa1d6038, mask=40, region=..., data=...) at ../../../kwin/effects/blur/blur.cpp:230
#25 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#26 0x054c8e9f in KWin::PresentWindowsEffect::paintScreen (this=0xa1c24a8, mask=8, region=..., data=...) at ../../../kwin/effects/presentwindows/presentwindows.cpp:205
#27 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#28 0x00e40256 in KWin::Effect::paintScreen (this=0xa314b18, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#29 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#30 0x00e40256 in KWin::Effect::paintScreen (this=0xa409828, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#31 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#32 0x00e40256 in KWin::Effect::paintScreen (this=0xa26d948, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#33 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#34 0x00e40256 in KWin::Effect::paintScreen (this=0xa23f090, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#35 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#36 0x054af809 in KWin::DesktopGridEffect::paintScreen (this=0xa3bd260, mask=8, region=..., data=...) at ../../../kwin/effects/desktopgrid/desktopgrid.cpp:156
#37 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#38 0x054a8799 in KWin::BoxSwitchEffect::paintScreen (this=0xa4092e8, mask=8, region=..., data=...) at ../../../kwin/effects/boxswitch/boxswitch.cpp:143
#39 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#40 0x05502c1c in KWin::CubeEffect::paintScreen (this=0xa2c2cf8, mask=8, region=..., data=...) at ../../../kwin/effects/cube/cube.cpp:698
#41 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#42 0x00e40256 in KWin::Effect::paintScreen (this=0xa3f3658, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#43 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#44 0x00e40256 in KWin::Effect::paintScreen (this=0xa324808, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#45 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#46 0x0550be40 in KWin::CubeSlideEffect::paintScreen (this=0xa2a47f8, mask=8, region=..., data=...) at ../../../kwin/effects/cube/cubeslide.cpp:111
#47 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#48 0x00e40256 in KWin::Effect::paintScreen (this=0xa312950, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#49 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#50 0x00e40256 in KWin::Effect::paintScreen (this=0xa240c30, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#51 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#52 0x054fba5c in KWin::CoverSwitchEffect::paintScreen (this=0xa25e7a8, mask=8, region=..., data=...) at ../../../kwin/effects/coverswitch/coverswitch.cpp:126
#53 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#54 0x00e40256 in KWin::Effect::paintScreen (this=0xa2b5740, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#55 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#56 0x00e40256 in KWin::Effect::paintScreen (this=0xa1b1170, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#57 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#58 0x00e40256 in KWin::Effect::paintScreen (this=0xa2ec5e0, mask=8, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#59 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#60 0x054f10f1 in KWin::ZoomEffect::paintScreen (this=0xa311d58, mask=8, region=..., data=...) at ../../../kwin/effects/zoom/zoom.cpp:341
#61 0x00b92269 in KWin::EffectsHandlerImpl::paintScreen (this=0xa184110, mask=8, region=..., data=...) at ../../kwin/effects.cpp:169
#62 0x00b748bc in KWin::Scene::paintScreen (this=0x9d9abd8, mask=0xbfd8a3b8, region=0xbfd8a440) at ../../kwin/scene.cpp:137
#63 0x00b8b892 in KWin::SceneOpenGL::paint (this=0x9d9abd8, damage=..., toplevels=...) at ../../kwin/scene_opengl.cpp:772
#64 0x00b707b6 in KWin::Workspace::performCompositing (this=0xb3e4c0e8) at ../../kwin/composite.cpp:448
#65 0x03106214 in QObject::event (this=0xb3e4c0e8, e=0xbfd8a96c) at kernel/qobject.cpp:1190
#66 0x012d4d24 in QApplicationPrivate::notify_helper (this=0x9d11330, receiver=0xb3e4c0e8, e=0xbfd8a96c) at kernel/qapplication.cpp:4462
#67 0x012d98ce in QApplication::notify (this=0xbfd8ac84, receiver=0xb3e4c0e8, e=0xbfd8a96c) at kernel/qapplication.cpp:3862
#68 0x0053c32a in KApplication::notify (this=0xbfd8ac84, receiver=0xb3e4c0e8, event=0xbfd8a96c) at ../../kdeui/kernel/kapplication.cpp:311
#69 0x00aff9ef in KWin::Application::notify (this=0xbfd8ac84, o=0xb3e4c0e8, e=0xbfd8a96c) at ../../kwin/main.cpp:376
#70 0x030f10bb in QCoreApplication::notifyInternal (this=0xbfd8ac84, receiver=0xb3e4c0e8, event=0xbfd8a96c) at kernel/qcoreapplication.cpp:731
#71 0x031211e4 in sendEvent (this=0x9d121d8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#72 QTimerInfoList::activateTimers (this=0x9d121d8) at kernel/qeventdispatcher_unix.cpp:604
#73 0x03121338 in QEventDispatcherUNIX::processEvents (this=0x9ccfaa8, flags=...) at kernel/qeventdispatcher_unix.cpp:923
#74 0x0138c25a in QEventDispatcherX11::processEvents (this=0x9ccfaa8, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#75 0x030f0289 in QEventLoop::processEvents (this=0xbfd8abc4, flags=...) at kernel/qeventloop.cpp:149
#76 0x030f0522 in QEventLoop::exec (this=0xbfd8abc4, flags=...) at kernel/qeventloop.cpp:201
#77 0x030f4ecc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#78 0x012d28e7 in QApplication::exec () at kernel/qapplication.cpp:3736
#79 0x00b024e2 in kdemain (argc=1, argv=0xbfd8af04) at ../../kwin/main.cpp:542
#80 0x080485bb in main (argc=1, argv=0xbfd8af04) at kwin_dummy.cpp:3

Possible duplicates by query: bug 283498, bug 283096, bug 282981, bug 282275, bug 281056.

Reported using DrKonqi