Application: systemsettings (1.0)
KDE Platform Version: 4.8.5 (4.8.5)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-58-generic i686
Distribution: Ubuntu 12.04.4 LTS

-- Information about the crash:
- What I was doing when the application crashed:
in order to change desktop effects, it was prompting me to "reactivate" an application that apparently crashed

- Custom settings of the application:
have two monitors (extended desktop)

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xb776c740 (LWP 2044))]

Thread 2 (Thread 0xb54b6b40 (LWP 2045)):
#0  0x008b325b in read () from /lib/i386-linux-gnu/libc.so.6
#1  0x086f16ce in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0x086b2b92 in g_main_context_check () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0x086b3002 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0x086b31c1 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0x06d968e7 in QEventDispatcherGlib::processEvents (this=0xb4b00468, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x06d6250d in QEventLoop::processEvents (this=0xb54b6240, flags=...) at kernel/qeventloop.cpp:149
#7  0x06d627a9 in QEventLoop::exec (this=0xb54b6240, flags=...) at kernel/qeventloop.cpp:204
#8  0x06c4b94c in QThread::exec (this=0x9e94648) at thread/qthread.cpp:501
#9  0x06d3fb5d in QInotifyFileSystemWatcherEngine::run (this=0x9e94648) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x06c4ede0 in QThreadPrivate::start (arg=0x9e94648) at thread/qthread_unix.cpp:298
#11 0x00df8d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0x008c3bae in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb776c740 (LWP 2044)):
[KCrash Handler]
#7  nouveau_flush (ctx=0xa189a28) at nouveau_driver.c:70
#8  nouveau_flush (ctx=0xa189a28) at nouveau_driver.c:57
#9  0x037924d0 in _mesa_flush (ctx=0xa189a28) at main/context.c:1652
#10 0x03792572 in _mesa_make_current (newCtx=0x0, drawBuffer=0x0, readBuffer=0x0) at main/context.c:1431
#11 0x03918a34 in _mesa_meta_free (ctx=0xa189a28) at drivers/common/meta.c:417
#12 0x0264502c in nouveau_context_deinit (ctx=0xa189a28) at nouveau_context.c:171
#13 0x02659b48 in nv20_context_destroy (ctx=0xa189a28) at nv20_context.c:427
#14 0x02645088 in nouveau_context_destroy (dri_ctx=0xa037c10) at nouveau_context.c:187
#15 0x0264193a in driDestroyContext (pcp=0xa037c10) at ../common/dri_util.c:277
#16 0x025fb3ca in dri2_destroy_context (context=0xa166e98) at dri2_glx.c:132
#17 0x025d1da2 in glXDestroyContext (ctx=0xa166e98, dpy=0x9aae9a0) at glxcmds.c:424
#18 glXDestroyContext (dpy=0x9aae9a0, ctx=0xa166e98) at glxcmds.c:405
#19 0x0248b446 in KWin::CompositingPrefs::deleteGLXContext (this=0x9f7fbc4) at ../../../../kwin/compositingprefs.cpp:282
#20 0x0248be54 in KWin::CompositingPrefs::detect (this=0x9f7fbc4) at ../../../../kwin/compositingprefs.cpp:223
#21 0x0247e882 in KWin::KWinCompositingConfig::updateStatusUI (this=0x9f7fa90, compositingIsPossible=true) at ../../../../kwin/kcmkwin/kwincompositing/main.cpp:369
#22 0x02481703 in KWin::KWinCompositingConfig::load (this=0x9f7fa90) at ../../../../kwin/kcmkwin/kwincompositing/main.cpp:387
#23 0x0247dd54 in KWin::KWinCompositingConfig::rearmGlSupport (this=0x9f7fa90) at ../../../../kwin/kcmkwin/kwincompositing/main.cpp:303
#24 0x06d7a6b1 in QMetaObject::activate (sender=0x9f8b488, m=0x18e67c8, local_signal_index=2, argv=0xbfce9e88) at kernel/qobject.cpp:3547
#25 0x016929cd in QAbstractButton::clicked (this=0x9f8b488, _t1=false) at .moc/release-shared/moc_qabstractbutton.cpp:220
#26 0x0138667d in QAbstractButtonPrivate::emitClicked (this=0x9f5bd78) at widgets/qabstractbutton.cpp:548
#27 0x01387ceb in QAbstractButtonPrivate::click (this=0x9f5bd78) at widgets/qabstractbutton.cpp:541
#28 0x01387fa6 in QAbstractButton::mouseReleaseEvent (this=0x9f8b488, e=0xbfcea554) at widgets/qabstractbutton.cpp:1123
#29 0x00fb51ac in QWidget::event (this=0x9f8b488, event=0xbfcea554) at kernel/qwidget.cpp:8362
#30 0x01387249 in QAbstractButton::event (this=0x9f8b488, e=0xbfcea554) at widgets/qabstractbutton.cpp:1082
#31 0x0142a7b8 in QPushButton::event (this=0x9f8b488, e=0xbfcea554) at widgets/qpushbutton.cpp:683
#32 0x00f5aed4 in notify_helper (e=0xbfcea554, receiver=0x9f8b488, this=0x9a95290) at kernel/qapplication.cpp:4559
#33 QApplicationPrivate::notify_helper (this=0x9a95290, receiver=0x9f8b488, e=0xbfcea554) at kernel/qapplication.cpp:4531
#34 0x00f61024 in QApplication::notify (this=0x9a95290, receiver=0x9f8b488, e=0xbfcea554) at kernel/qapplication.cpp:4102
#35 0x0057de01 in KApplication::notify (this=0xbfceadac, receiver=0x9f8b488, event=0xbfcea554) at ../../kdeui/kernel/kapplication.cpp:311
#36 0x06d6397e in QCoreApplication::notifyInternal (this=0xbfceadac, receiver=0x9f8b488, event=0xbfcea554) at kernel/qcoreapplication.cpp:876
#37 0x00f5be95 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#38 QApplicationPrivate::sendMouseEvent (receiver=0x9f8b488, event=0xbfcea554, alienWidget=0x9f8b488, nativeWidget=0x9b768d0, buttonDown=0x18efcf4, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:3170
#39 0x00fe80c4 in QETWidget::translateMouseEvent (this=0x9b768d0, event=0xbfceaa0c) at kernel/qapplication_x11.cpp:4619
#40 0x00fe6c5d in QApplication::x11ProcessEvent (this=0xbfceadac, event=0xbfceaa0c) at kernel/qapplication_x11.cpp:3734
#41 0x01013efc in x11EventSourceDispatch (s=0x9a97ce8, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#42 0x086b2d46 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#43 0x086b30e5 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#44 0x086b31c1 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#45 0x06d968e7 in QEventDispatcherGlib::processEvents (this=0x9a72798, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#46 0x01013afa in QGuiEventDispatcherGlib::processEvents (this=0x9a72798, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#47 0x06d6250d in QEventLoop::processEvents (this=0xbfcead04, flags=...) at kernel/qeventloop.cpp:149
#48 0x06d627a9 in QEventLoop::exec (this=0xbfcead04, flags=...) at kernel/qeventloop.cpp:204
#49 0x06d67eba in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#50 0x00f58a74 in QApplication::exec () at kernel/qapplication.cpp:3820
#51 0x080502b8 in main (argc=<error reading variable: Cannot access memory at address 0x0>, argv=<error reading variable: Cannot access memory at address 0x4>) at ../../../systemsettings/app/main.cpp:49

Reported using DrKonqi