Application: kwin (4.5.1 (KDE 4.5.1))
KDE Platform Version: 4.5.1 (KDE 4.5.1) (Compiled from sources)
Qt Version: 4.7.0
Operating System: Linux 2.6.35-28-generic i686
Distribution: Ubuntu 10.10

-- Information about the crash:
- What I was doing when the application crashed:

Tried to change from RenderX to OpenGL at effects configuration

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0xb7781720 (LWP 3831))]

Thread 2 (Thread 0xaeb32b70 (LWP 3837)):
#0  0x004ec416 in __kernel_vsyscall ()
#1  0x00aee371 in select () from /lib/libc.so.6
#2  0x09098872 in qt_safe_select (nfds=19, fdread=0xa136ab0, fdwrite=0xa136cc4, fdexcept=0xa136ed8, orig_timeout=0x0) at kernel/qcore_unix.cpp:82
#3  0x0909d329 in QEventDispatcherUNIX::select (this=0xa0ceab8, nfds=19, readfds=0xa136ab0, writefds=0xa136cc4, exceptfds=0xa136ed8, timeout=0x0) at kernel/qeventdispatcher_unix.cpp:632
#4  0x0909deac in QEventDispatcherUNIXPrivate::doSelect (this=0xa1369b8, flags=..., timeout=0x0) at kernel/qeventdispatcher_unix.cpp:219
#5  0x0909ec25 in QEventDispatcherUNIX::processEvents (this=0xa0ceab8, flags=...) at kernel/qeventdispatcher_unix.cpp:919
#6  0x0906b609 in QEventLoop::processEvents (this=0xaeb32280, flags=) at kernel/qeventloop.cpp:149
#7  0x0906ba8a in QEventLoop::exec (this=0xaeb32280, flags=...) at kernel/qeventloop.cpp:201
#8  0x08f67b7e in QThread::exec (this=0xa0a3af0) at thread/qthread.cpp:490
#9  0x0904a35b in QInotifyFileSystemWatcherEngine::run (this=0xa0a3af0) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x08f6adf9 in QThreadPrivate::start (arg=0xa0a3af0) at thread/qthread_unix.cpp:266
#11 0x002e6cc9 in start_thread () from /lib/libpthread.so.0
#12 0x00af569e in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb7781720 (LWP 3831)):
[KCrash Handler]
#7  0x02f1a818 in ?? () from /usr/lib/dri/r300_dri.so
#8  0x002321bc in ?? () from /usr/lib/mesa/libGL.so.1
#9  0x0020b1f7 in glXSwapBuffers () from /usr/lib/mesa/libGL.so.1
#10 0x0042ae3e in KWin::SceneOpenGL::flushBuffer (this=0x9e67fa0, mask=165557968, damage=...) at ../../kwin/scene_opengl.cpp:837
#11 0x0042bed4 in KWin::SceneOpenGL::paint (this=0x9e67fa0, damage=..., toplevels=...) at ../../kwin/scene_opengl.cpp:767
#12 0x00413be4 in KWin::Workspace::performCompositing (this=0x9e6db60) at ../../kwin/composite.cpp:454
#13 0x00384c1e in KWin::Workspace::qt_metacall (this=0x9e6db60, _c=QMetaObject::InvokeMetaMethod, _id=190, _a=0xbfd308fc) at ./workspace.moc:583
#14 0x090728ca in QMetaObject::metacall (object=0x9e6db60, cl=165523192, idx=190, argv=0xbfd308fc) at kernel/qmetaobject.cpp:237
#15 0x090856ad in QMetaObject::activate (sender=0x9e6de10, m=0x919f5a4, local_signal_index=0, argv=0x0) at kernel/qobject.cpp:3280
#16 0x090d71e7 in QTimer::timeout (this=0x9e6de10) at .moc/release-shared/moc_qtimer.cpp:134
#17 0x0908b1ce in QTimer::timerEvent (this=0x9e6de10, e=0xbfd30e50) at kernel/qtimer.cpp:271
#18 0x0907f504 in QObject::event (this=0x9e6de10, e=0x31fdef0) at kernel/qobject.cpp:1183
#19 0x01e99fdc in QApplicationPrivate::notify_helper (this=0x9d5aff0, receiver=0x9e6de10, e=0xbfd30e50) at kernel/qapplication.cpp:4396
#20 0x01ea004e in QApplication::notify (this=0xbfd31154, receiver=0x9e6de10, e=0xbfd30e50) at kernel/qapplication.cpp:3798
#21 0x006c568a in KApplication::notify (this=0xbfd31154, receiver=0x9e6de10, event=0xbfd30e50) at ../../kdeui/kernel/kapplication.cpp:310
#22 0x003a1aef in KWin::Application::notify (this=0xbfd31154, o=0x9e6de10, e=0xbfd30e50) at ../../kwin/main.cpp:372
#23 0x0906cb3b in QCoreApplication::notifyInternal (this=0xbfd31154, receiver=0x9e6de10, event=0xbfd30e50) at kernel/qcoreapplication.cpp:732
#24 0x0909ead6 in sendEvent (this=0x9d5b778) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#25 QTimerInfoList::activateTimers (this=0x9d5b778) at kernel/qeventdispatcher_unix.cpp:602
#26 0x0909ec37 in QEventDispatcherUNIX::processEvents (this=0x9d3e998, flags=...) at kernel/qeventdispatcher_unix.cpp:923
#27 0x01f5d0d2 in QEventDispatcherX11::processEvents (this=0x9d3e998, flags=...) at kernel/qeventdispatcher_x11.cpp:152
#28 0x0906b609 in QEventLoop::processEvents (this=0xbfd310a4, flags=) at kernel/qeventloop.cpp:149
#29 0x0906ba8a in QEventLoop::exec (this=0xbfd310a4, flags=...) at kernel/qeventloop.cpp:201
#30 0x0907000f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#31 0x01e98e07 in QApplication::exec () at kernel/qapplication.cpp:3672
#32 0x003a3c54 in kdemain (argc=3, argv=0xbfd313b4) at ../../kwin/main.cpp:531
#33 0x080485ab in main (argc=3, argv=0xbfd313b4) at kwin_dummy.cpp:3

Possible duplicates by query: bug 266543, bug 266362, bug 265296, bug 254798, bug 253703.

Reported using DrKonqi