Application: kwin (4.10.2)
KDE Platform Version: 4.10.2
Qt Version: 4.8.4
Operating System: Linux 3.8.8-1-ARCH i686
Distribution (Platform): Archlinux Packages

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

Reduced from two to one screens, using XRandR

Ok, Dr. Konqui requires more information here ;-)

The crash can be reproduced every time.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
Using host libthread_db library "/usr/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0xaf2b4740 (LWP 13903))]

Thread 3 (Thread 0xabbffb40 (LWP 13916)):
#0  0xb7796424 in __kernel_vsyscall ()
#1  0xb5f606fb in pthread_cond_wait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#2  0xb710e2fd in ?? () from /usr/lib/libQtScript.so.4
#3  0xb710e32f in ?? () from /usr/lib/libQtScript.so.4
#4  0xb53e8e81 in ?? () from /usr/lib/libGL.so.1
#5  0x5c8b0824 in ?? ()
#6  0xbab80424 in ?? ()
#7  0x65000000 in ?? ()
#8  0x001015ff in ?? ()
#9  0xd3890000 in ?? ()
#10 0xfff0013d in ?? ()
#11 0xc30173ff in ?? ()
#12 0x0f6acae8 in ?? ()
#13 0x1bc18100 in ?? ()
#14 0x8b0017c4 in ?? ()
#15 0xffff2089 in ?? ()
#16 0x65d8f7ff in ?? ()
#17 0x00000d03 in ?? ()
#18 0x01890000 in ?? ()
#19 0xc3ffc883 in ?? ()
#20 0x81535657 in ?? ()
#21 0x0000a0ec in ?? ()
#22 0x6a9de800 in ?? ()
#23 0xc381000f in ?? ()
#24 0x0017c3f2 in ?? ()
#25 0xb024b48b in ?? () from /usr/lib/libnvidia-glcore.so.313.30
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 2 (Thread 0xac5a6b40 (LWP 14266)):
#0  0xb7796424 in __kernel_vsyscall ()
#1  0xb5f60ae3 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /usr/lib/libpthread.so.0
#2  0xb5fd8d6d in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#3  0xb5fcb5cc in ?? () from /usr/lib/libQtCore.so.4
#4  0xb5fd8818 in ?? () from /usr/lib/libQtCore.so.4
#5  0xb53e8e81 in ?? () from /usr/lib/libGL.so.1
#6  0x5c8b0824 in ?? ()
#7  0xbab80424 in ?? ()
#8  0x65000000 in ?? ()
#9  0x001015ff in ?? ()
#10 0xd3890000 in ?? ()
#11 0xfff0013d in ?? ()
#12 0xc30173ff in ?? ()
#13 0x0f6acae8 in ?? ()
#14 0x1bc18100 in ?? ()
#15 0x8b0017c4 in ?? ()
#16 0xffff2089 in ?? ()
#17 0x65d8f7ff in ?? ()
#18 0x00000d03 in ?? ()
#19 0x01890000 in ?? ()
#20 0xc3ffc883 in ?? ()
#21 0x81535657 in ?? ()
#22 0x0000a0ec in ?? ()
#23 0x6a9de800 in ?? ()
#24 0xc381000f in ?? ()
#25 0x0017c3f2 in ?? ()
#26 0xb024b48b in ?? () from /usr/lib/libnvidia-glcore.so.313.30
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Thread 1 (Thread 0xaf2b4740 (LWP 13903)):
[KCrash Handler]
#6  operator!= (value=1, this=0xa5) at /usr/include/qt4/QtCore/qbasicatomic.h:75
#7  detach (this=0xa1adb9c) at /usr/include/qt4/QtCore/qmap.h:205
#8  find (akey=<optimized out>, this=0xa1adb9c) at /usr/include/qt4/QtCore/qmap.h:620
#9  KWin::Workspace::constrainedStackingOrder (this=this@entry=0xa0f4918) at /home/src/KDE4/kde-workspace/kwin/layers.cpp:521
#10 0xb762b138 in KWin::Workspace::updateStackingOrder (this=0xa0f4918, propagate_new_clients=<optimized out>) at /home/src/KDE4/kde-workspace/kwin/layers.cpp:125
#11 0x0a1962e8 in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)

Reported using DrKonqi