Application: kwin (4.7.3 (4.7.3))
KDE Platform Version: 4.7.3 (4.7.3) (Compiled from sources)
Qt Version: 4.8.0
Operating System: Linux 3.1.1-gentoo x86_64
Distribution: "Gentoo Base System release 2.0.3"

-- Information about the crash:
I was just exiting KDE and got this crash. It often occurs that I get crashes when I'm leaving my session. Some are related to kwin like this one.

The crash does not seem to be reproducible.

-- Backtrace:
Application: KWin (kwin), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fa6285127a0 (LWP 5782))]

Thread 2 (Thread 0x7fa60d049700 (LWP 5816)):
#0  pthread_cond_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fa626bef962 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fa626ee7e80) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007fa626bef999 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<value optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007fa6255ea2aa in ?? () from /usr/lib64/opengl/nvidia/lib/libGL.so.1
#4  0x00007fa623d07d4c in start_thread (arg=0x7fa60d049700) at pthread_create.c:301
#5  0x00007fa627d8c2ad in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:115

Thread 1 (Thread 0x7fa6285127a0 (LWP 5782)):
[KCrash Handler]
#6  ref (this=0x387e030, r=...) at src/corelib/arch/qatomic_x86_64.h:121
#7  QRegion::operator= (this=0x387e030, r=...) at painting/qregion.cpp:3934
#8  0x00007fa6280dbee0 in KWin::Toplevel::copyToDeleted (this=0x387dfc0, c=0x2107260) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/toplevel.cpp:129
#9  0x00007fa6280f80a9 in KWin::Deleted::copyToDeleted (this=0x387dfc0, c=0x2107260) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/deleted.cpp:68
#10 0x00007fa6280f82e5 in KWin::Deleted::create (c=0x2107260) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/deleted.cpp:53
#11 0x00007fa6280dcd6c in KWin::Unmanaged::release (this=0x2107260) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/unmanaged.cpp:84
#12 0x00007fa628065fb1 in KWin::Workspace::~Workspace (this=0x7fa6082ac410, __in_chrg=<value optimized out>) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/workspace.cpp:542
#13 0x00007fa628066739 in KWin::Workspace::~Workspace (this=0x7fa6082ac410, __in_chrg=<value optimized out>) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/workspace.cpp:574
#14 0x00007fa62807bb60 in KWin::Application::~Application (this=0x7fff1c4e2a60, __in_chrg=<value optimized out>) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/main.cpp:338
#15 0x00007fa62807e2ca in kdemain (argc=3, argv=0x7fff1c4e30a8) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3/kwin/main.cpp:491
#16 0x000000000040076b in main (argc=<value optimized out>, argv=<value optimized out>) at /usr/src/debug/kde-base/kwin-4.7.3/kwin-4.7.3_build/kwin/kwin_dummy.cpp:3

Reported using DrKonqi