Version:           unknown (using 4.2.00 (KDE 4.2.0) "release 102", KDE:KDE4:Factory:Desktop / openSUSE_11.0)
Compiler:          gcc
OS:                Linux (i686) release 2.6.25.20-0.1-pae

KWin crashed with signal 11 (SIGSEGV).
This is an intermittent occurrence and I have yet to find any way of forcing it to occur and so am unable to provide a list of packages running etc.

I've attempted to get a backtrace but I get a message that it's of no use but I enclose it below in case it's of some help anyway. I have searched the openSUSE repos for a kwin debuginfo package but I can't find one.
I'm also adding part of the .xsession-errors file in case that's of some use plus /var/log/messages.

I do have a list of ps auwx of user processes taken immediately after the crash if you want a copy of that, let me know

OpenSUSE 11.0, KDE4 (Factory) up to date as of 3-Mar-2009
Graphics card: Nvidia GeForce 6800 with nvidia drivers version 180-29

<snip>
This backtrace appears to be of no use.
This is probably because your packages are built in a way which prevents creation of proper backtraces, or the stack frame was seriously corrupted in the crash.

[?1034h(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb552f6f0 (LWP 15649)]
[New Thread 0xae8a1b90 (LWP 16921)]
0xffffe430 in __kernel_vsyscall ()
[Current thread is 0 (LWP 15649)]

Thread 2 (Thread 0xae8a1b90 (LWP 16921)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb68eced1 in select () from /lib/libc.so.6
#2  0xb6e2c337 in QProcessManager::run (this=0x807d260) at io/qprocess_unix.cpp:301
#3  0xb6d5a73e in QThreadPrivate::start (arg=0x807d260) at thread/qthread_unix.cpp:185
#4  0xb6cfa175 in start_thread () from /lib/libpthread.so.0
#5  0xb68f3dae in clone () from /lib/libc.so.6

Thread 1 (Thread 0xb552f6f0 (LWP 15649)):
#0  0xffffe430 in __kernel_vsyscall ()
#1  0xb68bd0c6 in nanosleep () from /lib/libc.so.6
#2  0xb68bceae in sleep () from /lib/libc.so.6
#3  0xb7e0c6c0 in KCrash::startDrKonqi (argv=0xbff62c54, argc=17) at /usr/src/debug/kdelibs-4.2.0/kdeui/util/kcrash.cpp:412
#4  0xb7e0d084 in KCrash::defaultCrashHandler (sig=11) at /usr/src/debug/kdelibs-4.2.0/kdeui/util/kcrash.cpp:337
#5  <signal handler called>
#6  0xb793ea2c in typeinfo for QPixmap () from /usr/lib/libQtGui.so.4
#7  0xb31855c3 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#8  0xb3190795 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#9  0xb3190eab in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#10 0xb319182a in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#11 0xb8012387 in ?? () from /usr/lib/libkdeinit4_kwin.so
#12 0xb7f9cc05 in ?? () from /usr/lib/libkdeinit4_kwin.so
#13 0xb7f9cd12 in ?? () from /usr/lib/libkdeinit4_kwin.so
#14 0xb7fc1a08 in ?? () from /usr/lib/libkdeinit4_kwin.so
#15 0xb7faf112 in ?? () from /usr/lib/libkdeinit4_kwin.so
#16 0xb7135fde in qt_x11EventFilter (ev=0x826de00) at kernel/qapplication_x11.cpp:371
#17 0xb7148748 in QApplication::x11ProcessEvent (this=0xbff63d64, event=0xbff63a4c) at kernel/qapplication_x11.cpp:3262
#18 0xb717340c in x11EventSourceDispatch (s=0x806c4e0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:142
#19 0xb652a2d9 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#20 0xb652d85b in ?? () from /usr/lib/libglib-2.0.so.0
#21 0xb652d9d8 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#22 0xb6e7a458 in QEventDispatcherGlib::processEvents (this=0x8069bc0, flags={i = -1074381816}) at kernel/qeventdispatcher_glib.cpp:319
#23 0xb7172ad5 in QGuiEventDispatcherGlib::processEvents (this=0x8069bc0, flags={i = -1074381768}) at kernel/qguieventdispatcher_glib.cpp:198
#24 0xb6e4cf1a in QEventLoop::processEvents (this=0xbff63cb0, flags={i = -1074381704}) at kernel/qeventloop.cpp:145
#25 0xb6e4d35a in QEventLoop::exec (this=0xbff63cb0, flags={i = -1074381640}) at kernel/qeventloop.cpp:196
#26 0xb6e4f7e9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:876
#27 0xb70d2c27 in QApplication::exec () at kernel/qapplication.cpp:3549
#28 0xb7fb1faa in kdemain () from /usr/lib/libkdeinit4_kwin.so
#29 0x08048762 in _start ()
#0  0xffffe430 in __kernel_vsyscall ()
</snip>

# tail /var/log/messages
<snip>
Mar  4 15:31:22 nikyo gconfd (alan-6190): GConf server is not in use, shutting down.
Mar  4 15:31:22 nikyo gconfd (alan-6190): Exiting
</snip>

file: .xsession-errors
<snip>
kdeinit4: preparing to launch
kdeinit4: preparing to launch
kdeinit4: preparing to launch
kdeinit4: preparing to launch
kdeinit4: preparing to launch
kdeinit4: preparing to launch
Application::crashHandler() called with signal 11; recent crashes: 1
KCrash: Application 'kwin' crashing...
kdeinit4: preparing to launch /usr/lib/kde4/libexec/drkonqi
/usr/bin/firefox: line 126:  6188 Segmentation fault      $MOZ_PROGRAM "$@"
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x6c00118
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x6c00118
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  25
  Minor opcode:  0
  Resource id:  0x5c0005e
plasma(5773): Failed to lock file "/var/tmp/kdecache-alanebDtK9/kpc/plasma_theme_Aya.lock" , last result = 1
kwin: X Error (error: <unknown>[DAMAGE+0], request: XDamageDestroy[DAMAGE+2], resource: 0x6401549)
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  25
  Minor opcode:  0
  Resource id:  0x5c0005e
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  25
  Minor opcode:  0
  Resource id:  0x5c0005e
kdeinit4: preparing to launch
dolphin(5813) KConfigGroup::readXdgListEntry: List entry MimeType in "/usr/share/kde4/services/ServiceMenus/preview.desktop" is not compliant with XDG standard (missing trailing semicolon).
kdeinit4: preparing to launch /usr/bin/kwrite
kdeinit4: preparing to launch
kwin: X Error (error: <unknown>[DAMAGE+0], request: XDamageDestroy[DAMAGE+2], resource: 0x64019d5)
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  25
  Minor opcode:  0
  Resource id:  0x5c0005e
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  25
  Minor opcode:  0
  Resource id:  0x5c0005e
kdeinit4: preparing to launch
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  25
  Minor opcode:  0
  Resource id:  0x5c0005e
kwin: X Error (error: <unknown>[DAMAGE+0], request: XDamageDestroy[DAMAGE+2], resource: 0x6402934)
dolphin(5813) KConfigGroup::readXdgListEntry: List entry MimeType in "/usr/share/kde4/services/ServiceMenus/preview.desktop" is not compliant with XDG standard (missing trailing semicolon).
kdeinit4: preparing to launch /usr/bin/kwrite
Object::connect: Attempt to bind non-signal TaskManager::TaskGroup::editRequest()
kwin: X Error (error: <unknown>[DAMAGE+0], request: XDamageDestroy[DAMAGE+2], resource: 0x6402ad8)
X Error: BadWindow (invalid Window parameter) 3
  Major opcode:  25
  Minor opcode:  0
  Resource id:  0x5c0005e
</snip>