Application: kwin (4.9.2)
KDE Platform Version: 4.9.2
Qt Version: 4.8.3
Operating System: Linux 3.5.0-17-generic x86_64
Distribution: Ubuntu 12.10

-- Information about the crash:
I connected my second Display to my laptop (Asus ux32a).
When connecting the display, the KDE-Display settings menu opens. Thats also when kwin crashes.
The Settings menu remains usable though.

Although the systems remains +- stable, the gui becomes glitchy and slow for some seconds to minutes.

1366x768 pixel, 60hz
+ 1920x1080, 60hz

The crash can be reproduced some of the time.

-- Backtrace:
Application: KWin (kwin), signal: Bus error
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[KCrash Handler]
#6  __memset_sse2 () at ../sysdeps/x86_64/multiarch/../memset.S:908
#7  0x00007f2592445de6 in memset (__len=<optimized out>, __ch=255, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:85
#8  intel_miptree_alloc_mcs (intel=intel@entry=0x1425ab0, mt=0x12d4820, num_samples=num_samples@entry=8) at intel_mipmap_tree.c:823
#9  0x00007f25924460cd in intel_miptree_create_for_renderbuffer (intel=intel@entry=0x1425ab0, format=format@entry=MESA_FORMAT_ARGB8888, width=<optimized out>, height=<optimized out>, num_samples=num_samples@entry=8) at intel_mipmap_tree.c:480
#10 0x00007f2592446df7 in intel_miptree_create_for_dri2_buffer (intel=intel@entry=0x1425ab0, dri_attachment=1, format=MESA_FORMAT_ARGB8888, num_samples=num_samples@entry=8, region=0x1169530) at intel_mipmap_tree.c:372
#11 0x00007f25924420ab in intel_process_dri2_buffer (buffer_name=0x7f25924c3f29 "dri2 back buffer", rb=0x12b4b60, buffer=<optimized out>, intel=0x1425ab0, drawable=<optimized out>) at intel_context.c:1024
#12 intel_update_renderbuffers (context=context@entry=0x140a680, drawable=drawable@entry=0x140ba70) at intel_context.c:389
#13 0x00007f2592442202 in intel_prepare_render (intel=intel@entry=0x1425ab0) at intel_context.c:408
#14 0x00007f2592442ec7 in intelMakeCurrent (driContextPriv=0x140a680, driDrawPriv=0x140ba70, driReadPriv=0x140ba70) at intel_context.c:886
#15 0x00007f25924c0876 in driCreateConfigs (fb_format=2097152000, fb_type=255, depth_bits=0x116dc10 "", stencil_bits=0x0, num_depth_stencil_bits=117440384, db_modes=0xc0000, num_db_modes=31457490, msaa_samples=0x12a5ca0 "\020K*\001", num_msaa_modes=2863060416, enable_accum=248 '\370') at utils.c:312
#16 0x00007f25ae6c86d5 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#17 0x00007f25ae6c935c in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#18 0x00007f25ae6b7df8 in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#19 0x00007f25ae65138a in ?? () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#20 0x00007f25a9fd4f5f in QMetaObject::activate (sender=0x115f640, m=<optimized out>, local_signal_index=<optimized out>, argv=0x0) at kernel/qobject.cpp:3547
#21 0x00007f25a9eb3477 in QFutureWatcherBase::event (this=<optimized out>, event=0x7f258c0020f0) at concurrent/qfuturewatcher.cpp:344
#22 0x00007f25a9366e9c in QApplicationPrivate::notify_helper (this=this@entry=0xf89bd0, receiver=receiver@entry=0x115f640, e=e@entry=0x7f258c0020f0) at kernel/qapplication.cpp:4562
#23 0x00007f25a936b30a in QApplication::notify (this=0x7fff5e23e3c0, receiver=0x115f640, e=0x7f258c0020f0) at kernel/qapplication.cpp:4423
#24 0x00007f25ade311d6 in KApplication::notify (this=0x7f257d000000, receiver=0xff, event=0xffffffffffffffff) at ../../kdeui/kernel/kapplication.cpp:289
#25 0x00007f25a9e558e0 in ?? () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
#26 0x00007f25a8ef760d in operator new(unsigned long) () from /usr/lib/x86_64-linux-gnu/libstdc++.so.6
#27 0x0000000000f341f0 in ?? ()
#28 0x00007fff5e23e3c0 in ?? ()
#29 0x00007f25a9fbf56e in QCoreApplication::notifyInternal (this=0x7fff5e23e3c0, receiver=receiver@entry=0x115f640, event=event@entry=0x7f258c0020f0) at kernel/qcoreapplication.cpp:915
#30 0x00007f25a9fc33f1 in sendEvent (event=0x7f258c0020f0, receiver=0x115f640) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#31 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xf341f0) at kernel/qcoreapplication.cpp:1539
#32 0x00007f25a940c89c in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#33 QEventDispatcherX11::processEvents (this=0xf35ad0, flags=...) at kernel/qeventdispatcher_x11.cpp:75
#34 0x00007f25a9fbe2bf in QEventLoop::processEvents (this=this@entry=0x7fff5e23e0d0, flags=...) at kernel/qeventloop.cpp:149
#35 0x00007f25a9fbe548 in QEventLoop::exec (this=0x7fff5e23e0d0, flags=...) at kernel/qeventloop.cpp:204
#36 0x00007f25a9fc3708 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#37 0x00007f25ae670e34 in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_kwin.so
#38 0x00007f25ae27076d in __libc_start_main (main=0x4006a0, argc=3, ubp_av=0x7fff5e23e508, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff5e23e4f8) at libc-start.c:226
#39 0x00000000004006d1 in _start ()

Possible duplicates by query: bug 308398, bug 308369.

Reported using DrKonqi