Application: kwin (4.6.2 (4.6.2))
KDE Platform Version: 4.6.2 (4.6.2)
Qt Version: 4.7.2
Operating System: Linux 2.6.38-8-generic i686
Distribution: Ubuntu 11.04

-- Information about the crash:
- What I was doing when the application crashed:Each time i lock the screen in kde the system becomes unstable. The unlock dialogue becomes transparent and "glitchy", when i unlock the screen the taskbar is not visable and this error report comes up. This happens everytime, someone in the IRC suggested it was something to do with libgl1-mesa-dri.

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0xb77a7720 (LWP 4733))]

Thread 3 (Thread 0xb2e17b70 (LWP 4739)):
#0  0x02d13d41 in clock_gettime () from /lib/i386-linux-gnu/librt.so.1
#1  0x05302dd8 in do_gettime () at tools/qelapsedtimer_unix.cpp:123
#2  qt_gettime () at tools/qelapsedtimer_unix.cpp:140
#3  0x053d0525 in updateCurrentTime (this=0x8cf1250, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:339
#4  QEventDispatcherUNIXPrivate::doSelect (this=0x8cf1250, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:182
#5  0x053d1326 in QEventDispatcherUNIX::processEvents (this=0x8cc51c0, flags=...) at kernel/qeventdispatcher_unix.cpp:919
#6  0x053a0289 in QEventLoop::processEvents (this=0xb2e17280, flags=...) at kernel/qeventloop.cpp:149
#7  0x053a0522 in QEventLoop::exec (this=0xb2e17280, flags=...) at kernel/qeventloop.cpp:201
#8  0x052aa2a0 in QThread::exec (this=0x8cd99a8) at thread/qthread.cpp:492
#9  0x05381fdb in QInotifyFileSystemWatcherEngine::run (this=0x8cd99a8) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x052acda2 in QThreadPrivate::start (arg=0x8cd99a8) at thread/qthread_unix.cpp:320
#11 0x08100e99 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0x0040673e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 2 (Thread 0xb260eb70 (LWP 4740)):
#0  0x0089b416 in __kernel_vsyscall ()
#1  0x0810548c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0x004143fd in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0x01123817 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x12371c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#4  0x01123851 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x12371c0) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#5  0x08100e99 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0x0040673e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb77a7720 (LWP 4733)):
[KCrash Handler]
#7  intel_region_buffer (intel=0x86db9f0, region=0x0, flag=2) at intel_regions.c:514
#8  0x03bbcce2 in intelClearWithBlit (ctx=0x86db9f0, mask=2) at intel_blit.c:262
#9  0x03bbf4c0 in intelClear (ctx=0x86db9f0, mask=2) at intel_clear.c:177
#10 0x03d63512 in _mesa_Clear (mask=<value optimized out>) at main/clear.c:241
#11 0x00f5184b in KWin::SceneOpenGL::paintBackground (this=0x86fef78, region=...) at ../../kwin/scene_opengl.cpp:921
#12 0x00f48562 in KWin::Scene::paintGenericScreen (this=0x86fef78, orig_mask=32) at ../../kwin/scene.cpp:188
#13 0x00f51a31 in KWin::SceneOpenGL::paintGenericScreen (this=0x86fef78, mask=32, data=...) at ../../kwin/scene_opengl.cpp:909
#14 0x00f457c0 in KWin::Scene::finalPaintScreen (this=0x86fef78, mask=32, region=..., data=...) at ../../kwin/scene.cpp:178
#15 0x00f670fc in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=32, region=..., data=...) at ../../kwin/effects.cpp:173
#16 0x044390e9 in KWin::StartupFeedbackEffect::paintScreen (this=0x8c2c738, mask=32, region=..., data=...) at ../../../kwin/effects/startupfeedback/startupfeedback.cpp:166
#17 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=32, region=..., data=...) at ../../kwin/effects.cpp:169
#18 0x00180256 in KWin::Effect::paintScreen (this=0x8b3be18, mask=32, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#19 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=32, region=..., data=...) at ../../kwin/effects.cpp:169
#20 0x043db07f in KWin::LogoutEffect::paintScreen (this=0x8c6c150, mask=32, region=..., data=...) at ../../../kwin/effects/logout/logout.cpp:207
#21 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=32, region=..., data=...) at ../../kwin/effects.cpp:169
#22 0x043f6b10 in KWin::ShadowEffect::paintScreen (this=0x8c73bc8, mask=32, region=..., data=...) at ../../../kwin/effects/shadow/shadow.cpp:189
#23 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=32, region=..., data=...) at ../../kwin/effects.cpp:169
#24 0x0440b013 in KWin::BlurEffect::paintScreen (this=0x8a68f90, mask=32, region=..., data=...) at ../../../kwin/effects/blur/blur.cpp:230
#25 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#26 0x043dfe6f in KWin::PresentWindowsEffect::paintScreen (this=0x8b38480, mask=0, region=..., data=...) at ../../../kwin/effects/presentwindows/presentwindows.cpp:205
#27 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#28 0x00180256 in KWin::Effect::paintScreen (this=0x8b49140, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#29 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#30 0x00180256 in KWin::Effect::paintScreen (this=0x8b18450, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#31 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#32 0x00180256 in KWin::Effect::paintScreen (this=0x8c44648, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#33 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#34 0x00180256 in KWin::Effect::paintScreen (this=0x870fb28, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#35 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#36 0x00180256 in KWin::Effect::paintScreen (this=0x8ba2198, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#37 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#38 0x00180256 in KWin::Effect::paintScreen (this=0x86d1f88, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#39 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#40 0x0442a202 in KWin::FlipSwitchEffect::paintScreen (this=0x8c094b8, mask=0, region=..., data=...) at ../../../kwin/effects/flipswitch/flipswitch.cpp:148
#41 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#42 0x043c67e9 in KWin::DesktopGridEffect::paintScreen (this=0x8b389a0, mask=0, region=..., data=...) at ../../../kwin/effects/desktopgrid/desktopgrid.cpp:155
#43 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#44 0x043bf799 in KWin::BoxSwitchEffect::paintScreen (this=0x86d55e0, mask=0, region=..., data=...) at ../../../kwin/effects/boxswitch/boxswitch.cpp:143
#45 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#46 0x04419bcc in KWin::CubeEffect::paintScreen (this=0x8b03d00, mask=0, region=..., data=...) at ../../../kwin/effects/cube/cube.cpp:698
#47 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#48 0x00180256 in KWin::Effect::paintScreen (this=0x8c05110, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#49 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#50 0x04422df0 in KWin::CubeSlideEffect::paintScreen (this=0x8b192f8, mask=0, region=..., data=...) at ../../../kwin/effects/cube/cubeslide.cpp:111
#51 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#52 0x00180256 in KWin::Effect::paintScreen (this=0x8c89dc8, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#53 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#54 0x00180256 in KWin::Effect::paintScreen (this=0x8b35fe0, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#55 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#56 0x04412a0c in KWin::CoverSwitchEffect::paintScreen (this=0x8cac6d8, mask=0, region=..., data=...) at ../../../kwin/effects/coverswitch/coverswitch.cpp:126
#57 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#58 0x00180256 in KWin::Effect::paintScreen (this=0x8c46a38, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#59 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#60 0x00180256 in KWin::Effect::paintScreen (this=0x8a434f0, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#61 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#62 0x00180256 in KWin::Effect::paintScreen (this=0x8c73bb0, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#63 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#64 0x044330ac in KWin::MouseMarkEffect::paintScreen (this=0x8a461e0, mask=0, region=..., data=...) at ../../../kwin/effects/mousemark/mousemark.cpp:78
#65 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#66 0x04404c55 in KWin::ThumbnailAsideEffect::paintScreen (this=0x8b19bb0, mask=0, region=..., data=...) at ../../../kwin/effects/thumbnailaside/thumbnailaside.cpp:56
#67 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#68 0x00180256 in KWin::Effect::paintScreen (this=0x8b86d28, mask=0, region=..., data=...) at ../../../kwin/lib/kwineffects.cpp:227
#69 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#70 0x044080c1 in KWin::ZoomEffect::paintScreen (this=0x8c89238, mask=0, region=..., data=...) at ../../../kwin/effects/zoom/zoom.cpp:341
#71 0x00f67172 in KWin::EffectsHandlerImpl::paintScreen (this=0x89fb1e0, mask=0, region=..., data=...) at ../../kwin/effects.cpp:169
#72 0x00f4698c in KWin::Scene::paintScreen (this=0x86fef78, mask=0xbfdcbe28, region=0xbfdcbeb0) at ../../kwin/scene.cpp:137
#73 0x00f5d962 in KWin::SceneOpenGL::paint (this=0x86fef78, damage=..., toplevels=...) at ../../kwin/scene_opengl.cpp:772
#74 0x00f42886 in KWin::Workspace::performCompositing (this=0x89ff818) at ../../kwin/composite.cpp:448
#75 0x053b6214 in QObject::event (this=0x89ff818, e=0xbfdcc3dc) at kernel/qobject.cpp:1190
#76 0x075f0d24 in QApplicationPrivate::notify_helper (this=0x8632bd8, receiver=0x89ff818, e=0xbfdcc3dc) at kernel/qapplication.cpp:4462
#77 0x075f58ce in QApplication::notify (this=0xbfdcc6f4, receiver=0x89ff818, e=0xbfdcc3dc) at kernel/qapplication.cpp:3862
#78 0x00a7d3ca in KApplication::notify (this=0xbfdcc6f4, receiver=0x89ff818, event=0xbfdcc3dc) at ../../kdeui/kernel/kapplication.cpp:311
#79 0x00ed1abf in KWin::Application::notify (this=0xbfdcc6f4, o=0x89ff818, e=0xbfdcc3dc) at ../../kwin/main.cpp:376
#80 0x053a10bb in QCoreApplication::notifyInternal (this=0xbfdcc6f4, receiver=0x89ff818, event=0xbfdcc3dc) at kernel/qcoreapplication.cpp:731
#81 0x053d11e4 in sendEvent (this=0x86336d0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#82 QTimerInfoList::activateTimers (this=0x86336d0) at kernel/qeventdispatcher_unix.cpp:604
#83 0x053d1338 in QEventDispatcherUNIX::processEvents (this=0x85f0aa8, flags=...) at kernel/qeventdispatcher_unix.cpp:923
#84 0x076a57ea in QEventDispatcherX11::processEvents (this=0x85f0aa8, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#85 0x053a0289 in QEventLoop::processEvents (this=0xbfdcc634, flags=...) at kernel/qeventloop.cpp:149
#86 0x053a0522 in QEventLoop::exec (this=0xbfdcc634, flags=...) at kernel/qeventloop.cpp:201
#87 0x053a4ecc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#88 0x075ee8e7 in QApplication::exec () at kernel/qapplication.cpp:3736
#89 0x00ed45b2 in kdemain (argc=3, argv=0xbfdcc974) at ../../kwin/main.cpp:542
#90 0x080485bb in main (argc=3, argv=0xbfdcc974) at kwin_dummy.cpp:3

Possible duplicates by query: bug 272102, bug 272069, bug 272021, bug 272011, bug 271964.

Reported using DrKonqi