Version:            (using Devel)
Compiler:          gcc (GCC) 4.1.2 (Gentoo 4.1.2 p1.0.2)  
OS:                Linux
Installed from:    Compiled sources

When I try and do anything that involves logging out in some way, i.e shutting down, restarting or logging off through kickoff, kwin constantly crashes. This started happening 2 weeks back and it still hasn't been fixed for me. This on KDE 4.2 SVN.

I have the backtrace received when kwin crashed:-
Application: KWin (kwin), signal SIGABRT
Using host libthread_db library "/lib/libthread_db.so.1".

Thread 1 (Thread 0xb642ba00 (LWP 4003)):
[KCrash Handler]
#6  0xb7f05424 in __kernel_vsyscall ()
#7  0xb67a9101 in raise () from /lib/libc.so.6
#8  0xb67aa8e8 in abort () from /lib/libc.so.6
#9  0xb67a27a5 in __assert_fail () from /lib/libc.so.6
#10 0xb64768e8 in xcb_xlib_lock (c=0x8ebb9e8) at xcb_xlib.c:73
#11 0xb6ad2278 in _XCBLockDisplay (dpy=0x8eb5bb8) at xcb_lock.c:21
#12 0xb69d5d51 in XRenderFreePicture (dpy=0x8eb5bb8, picture=14680210) at Picture.c:236
#13 0xb6d9b437 in QX11PixmapData::release (this=0x8fe0d80) at image/qpixmap_x11.cpp:1173
#14 0xb6d9b830 in ~QX11PixmapData (this=0x8fe0d80) at image/qpixmap_x11.cpp:1149
#15 0xb6d920bb in QPixmap::deref (this=0x8f69010) at image/qpixmap.cpp:1258
#16 0xb6d92100 in ~QPixmap (this=0x8f69010) at image/qpixmap.cpp:320
#17 0xb4f4e60f in ~OxygenHelper (this=0x8f63108) at /usr/local/Trolltech/Qt-4.4.3/include/QtCore/qcache.h:134
#18 0xb4f4ead3 in destroy () at /home/pramod/KDE/kdebase/workspace/kwin/clients/ozone/oxygenclient.cpp:66
#19 0xb4f4ea98 in __tcf_0 () at /usr/local/include/KDE/../kglobal.h:62
#20 0xb67abd0c in exit () from /lib/libc.so.6
#21 0xb6acb2bb in _XDefaultError (dpy=0x8eb5bb8, event=0xbf820a2c) at XlibInt.c:2860
#22 0xb6acb393 in _XError (dpy=0x8eb5bb8, rep=0x9209798) at XlibInt.c:2912
#23 0xb6ad2b6a in process_responses (dpy=0x8eb5bb8, wait_for_first_event=0, current_error=0xbf820b28, current_request=726234) at xcb_io.c:138
#24 0xb6ad2f4a in _XReply (dpy=0x8eb5bb8, rep=0xbf820b50, extra=0, discard=1) at xcb_io.c:370
#25 0xb6ac6e18 in XSync (dpy=0x8eb5bb8, discard=1) at Sync.c:48
#26 0xb6aa801d in XCloseDisplay (dpy=0x8eb5bb8) at ClDisplay.c:67
#27 0xb6d3825a in qt_cleanup () at kernel/qapplication_x11.cpp:2319
#28 0xb6cd697d in ~QApplication (this=0xbf820d24) at kernel/qapplication.cpp:1013
#29 0xb7c41c4a in ~KApplication (this=0xbf820d24) at /home/pramod/KDE/kdelibs/kdeui/kernel/kapplication.cpp:938
#30 0xb7e7ca01 in ~Application (this=0xbf820d24) at /home/pramod/KDE/kdebase/workspace/kwin/main.cpp:349
#31 0xb7e80d04 in kdemain (argc=3, argv=0xbf820ef4) at /home/pramod/KDE/kdebase/workspace/kwin/main.cpp:513
#32 0x08048792 in main (argc=) at /home/pramod/KDE/kdebase/workspace/kwin/kwin_dummy.cpp:3

If there is anything more necessary, I will be more than happy to procure it.