Application: kwin (4.7.3 (4.7.3))
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.8.0
Operating System: Linux 3.1.1-2.fc16.x86_64 x86_64
Distribution: "Fedora release 16 (Verne)"

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

I had just changed few Desktop Effects and hit the Apply button.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
82	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7ff644c27840 (LWP 11732))]

Thread 2 (Thread 0x7ff631d33700 (LWP 11744)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:165
#1  0x0000003d09384e52 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x3d0967e240) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x0000003d09384e89 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x0000003ceac07d90 in start_thread (arg=0x7ff631d33700) at pthread_create.c:309
#4  0x0000003cea0eeddd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 1 (Thread 0x7ff644c27840 (LWP 11732)):
[KCrash Handler]
#6  0x00007ff639d4671d in ?? () from /usr/lib64/dri/nouveau_dri.so
#7  0x00007ff639d0872b in ?? () from /usr/lib64/dri/nouveau_dri.so
#8  0x00007ff639a855c5 in nouveau_pushbuf_flush () from /usr/lib64/libdrm_nouveau.so.1
#9  0x00007ff639dead82 in ?? () from /usr/lib64/dri/nouveau_dri.so
#10 0x00007ff64827d5de in KWin::SceneOpenGL::EffectFrame::free (this=0x1c2ab90) at /usr/src/debug/kde-workspace-4.7.3/kwin/scene_opengl.cpp:1093
#11 0x0000003cf1d8b7d1 in QMetaObject::activate (sender=0x17f7bc0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3546
#12 0x00007ff647c0e1d7 in Plasma::ThemePrivate::blurBehindChanged (this=0x17fa780, blur=<optimized out>) at /usr/src/debug/kdelibs-4.7.3/plasma/theme.cpp:338
#13 0x00007ff647c0ff80 in qt_static_metacall (_a=<optimized out>, _id=<optimized out>, _o=<optimized out>, _c=<optimized out>) at /usr/src/debug/kdelibs-4.7.3/x86_64-redhat-linux-gnu/plasma/theme.moc:97
#14 Plasma::Theme::qt_static_metacall (_o=<optimized out>, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at /usr/src/debug/kdelibs-4.7.3/x86_64-redhat-linux-gnu/plasma/theme.moc:87
#15 0x0000003cf1d8b7d1 in QMetaObject::activate (sender=0x17fdfb0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff8db7d050) at kernel/qobject.cpp:3546
#16 0x00007ff647bac04f in Plasma::EffectWatcher::blurBehindChanged (this=<optimized out>, _t1=true) at /usr/src/debug/kdelibs-4.7.3/x86_64-redhat-linux-gnu/plasma/effectwatcher_p.moc:99
#17 0x00007ff647bac191 in Plasma::EffectWatcher::x11Event (this=0x17fdfb0, event=0x7fff8db7d680) at /usr/src/debug/kdelibs-4.7.3/plasma/private/effectwatcher.cpp:61
#18 0x00007ff646fa62f6 in publicx11Event (e=0x7fff8db7d680, this=<optimized out>) at /usr/src/debug/kdelibs-4.7.3/kdeui/kernel/kapplication.cpp:918
#19 KApplication::x11EventFilter (this=<optimized out>, _event=0x7fff8db7d680) at /usr/src/debug/kdelibs-4.7.3/kdeui/kernel/kapplication.cpp:930
#20 0x0000003cf24373c5 in qt_x11EventFilter (ev=0x7fff8db7d680) at kernel/qapplication_x11.cpp:435
#21 qt_x11EventFilter (ev=0x7fff8db7d680) at kernel/qapplication_x11.cpp:423
#22 0x0000003cf2444378 in QApplication::x11ProcessEvent (this=0x7fff8db7d990, event=0x7fff8db7d680) at kernel/qapplication_x11.cpp:3353
#23 0x0000003cf246d23a in QEventDispatcherX11::processEvents (this=0x15a1ba0, flags=...) at kernel/qeventdispatcher_x11.cpp:132
#24 0x0000003cf1d76c82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#25 0x0000003cf1d76ed7 in QEventLoop::exec (this=0x7fff8db7d8d0, flags=...) at kernel/qeventloop.cpp:204
#26 0x0000003cf1d7b8d5 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#27 0x00007ff6482099b6 in kdemain (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kde-workspace-4.7.3/kwin/main.cpp:517
#28 0x0000003cea02169d in __libc_start_main (main=0x400810 <main(int, char**)>, argc=3, ubp_av=0x7fff8db7dff8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff8db7dfe8) at libc-start.c:226
#29 0x0000000000400841 in _start ()

Reported using DrKonqi