Bug 329210

Application: systemsettings (4.11.3)
KDE Platform Version: 4.12.0
Qt Version: 4.8.4
Operating System: Linux 3.11.0-14-generic i686
Distribution: Ubuntu 13.10

-- Information about the crash:
- What I was doing when the application crashed:

System Settings > Display and Monitor > Screen Locker > Screen Saver

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 0xb1515740 (LWP 4280))]

Thread 3 (Thread 0xae100b40 (LWP 4281)):
#0  __x86.get_pc_thunk.bx () at ../sysdeps/i386/crti.S:66
#1  0xb296fc09 in __pthread_mutex_unlock_usercnt (mutex=0xad700558, decr=1) at pthread_mutex_unlock.c:36
#2  0xb5d6ec04 in pthread_mutex_unlock (mutex=0xad700558) at forward.c:194
#3  0xb28d0bf0 in g_mutex_unlock () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb288d12e in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb288da5f in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#6  0xb288dca8 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#7  0xb60b18df in QEventDispatcherGlib::processEvents (this=0xad700468, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#8  0xb60809f3 in QEventLoop::processEvents (this=this@entry=0xae100228, flags=...) at kernel/qeventloop.cpp:149
#9  0xb6080d19 in QEventLoop::exec (this=this@entry=0xae100228, flags=...) at kernel/qeventloop.cpp:204
#10 0xb5f6fe3d in QThread::exec (this=this@entry=0x96ceb00) at thread/qthread.cpp:542
#11 0xb6060e14 in QInotifyFileSystemWatcherEngine::run (this=0x96ceb00) at io/qfilesystemwatcher_inotify.cpp:265
#12 0xb5f7272f in QThreadPrivate::start (arg=0x96ceb00) at thread/qthread_unix.cpp:338
#13 0xb296cd78 in start_thread (arg=0xae100b40) at pthread_create.c:311
#14 0xb5d6101e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131

Thread 2 (Thread 0xad6ffb40 (LWP 4282)):
#0  0xb772c424 in __kernel_vsyscall ()
#1  0xb297084b in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:187
#2  0xb5d6e9bc in __pthread_cond_wait (cond=0xb3b598d0, mutex=0xb3b598b8) at forward.c:149
#3  0xb3a56ef2 in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#4  0xb3a56f3f in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#5  0xb296cd78 in start_thread (arg=0xad6ffb40) at pthread_create.c:311
#6  0xb5d6101e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131

Thread 1 (Thread 0xb1515740 (LWP 4280)):
[KCrash Handler]
#7  QX11PixmapData::fromImage (this=0x9dab560, img=..., flags=...) at image/qpixmap_x11.cpp:1105
#8  0xb687de72 in QRasterWindowSurface::flush (this=0x93c62e0, widget=0x9c4b2a8, rgn=..., offset=...) at painting/qwindowsurface_raster.cpp:265
#9  0xb6898b5a in qt_flush (tlwOffset=..., tlw=<optimized out>, windowSurface=<optimized out>, region=..., widget=<optimized out>) at painting/qbackingstore.cpp:117
#10 QWidgetBackingStore::flush (this=0x93cfc60, widget=0x9379a50, surface=0x93c62e0) at painting/qbackingstore.cpp:1445
#11 0xb6898f69 in QWidgetBackingStore::endPaint (this=this@entry=0x93cfc60, cleaned=..., windowSurface=0x93c62e0, beginPaintInfo=beginPaintInfo@entry=0xbfbe7378) at painting/qbackingstore.cpp:409
#12 0xb689a216 in QWidgetBackingStore::sync (this=0x93cfc60) at painting/qbackingstore.cpp:1376
#13 0xb66a216b in QWidgetPrivate::syncBackingStore (this=this@entry=0x9375c60) at kernel/qwidget.cpp:1896
#14 0xb66b392c in QWidget::event (this=0x9379a50, event=event@entry=0xbfbe7920) at kernel/qwidget.cpp:8679
#15 0xb6ad4b0f in QMainWindow::event (this=this@entry=0x9379a50, event=event@entry=0xbfbe7920) at widgets/qmainwindow.cpp:1478
#16 0xb7276855 in KMainWindow::event (this=this@entry=0x9379a50, ev=ev@entry=0xbfbe7920) at ../../kdeui/widgets/kmainwindow.cpp:1084
#17 0xb72b8586 in KXmlGuiWindow::event (this=0x9379a50, ev=0xbfbe7920) at ../../kdeui/xmlgui/kxmlguiwindow.cpp:126
#18 0xb665a744 in QApplicationPrivate::notify_helper (this=0x9266940, receiver=0x9379a50, e=0xbfbe7920) at kernel/qapplication.cpp:4567
#19 0xb6661223 in QApplication::notify (this=0xbfbe83dc, receiver=receiver@entry=0x9379a50, e=e@entry=0xbfbe7920) at kernel/qapplication.cpp:4353
#20 0xb71a8164 in KApplication::notify (this=0xbfbe83dc, receiver=0x9379a50, event=0xbfbe7920) at ../../kdeui/kernel/kapplication.cpp:311
#21 0xb6081eda in QCoreApplication::notifyInternal (this=0xbfbe83dc, receiver=receiver@entry=0x9379a50, event=event@entry=0xbfbe7920) at kernel/qcoreapplication.cpp:946
#22 0xb689be67 in sendEvent (event=0xbfbe7920, receiver=0x9379a50) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#23 sendUpdateRequest (updateImmediately=true, widget=0x9379a50) at painting/qbackingstore.cpp:534
#24 QWidgetBackingStore::markDirty (this=0x93cfc60, rect=..., widget=widget@entry=0x9c87270, updateImmediately=updateImmediately@entry=true, invalidateBuffer=invalidateBuffer@entry=false) at painting/qbackingstore.cpp:722
#25 0xb66a24d2 in QWidget::repaint (this=0x9c87270, rect=...) at kernel/qwidget.cpp:10481
#26 0xb66a252b in QWidget::repaint (this=this@entry=0x9c87270) at kernel/qwidget.cpp:10431
#27 0xb6a716e2 in QAbstractButtonPrivate::click (this=this@entry=0x9c9b860) at widgets/qabstractbutton.cpp:536
#28 0xb6a7180e in QAbstractButton::mouseReleaseEvent (this=0x9c87270, e=0xbfbe7e44) at widgets/qabstractbutton.cpp:1123
#29 0xb66b41aa in QWidget::event (this=this@entry=0x9c87270, event=event@entry=0xbfbe7e44) at kernel/qwidget.cpp:8375
#30 0xb6a72812 in QAbstractButton::event (this=this@entry=0x9c87270, e=e@entry=0xbfbe7e44) at widgets/qabstractbutton.cpp:1082
#31 0xb6b0dd2f in QRadioButton::event (this=0x9c87270, e=0xbfbe7e44) at widgets/qradiobutton.cpp:266
#32 0xb665a744 in QApplicationPrivate::notify_helper (this=0x9266940, receiver=receiver@entry=0x9c87270, e=0xbfbe7e44) at kernel/qapplication.cpp:4567
#33 0xb6662df8 in QApplication::notify (this=0xbfbe83dc, receiver=receiver@entry=0x9c87270, e=e@entry=0xbfbe7e44) at kernel/qapplication.cpp:4110
#34 0xb71a8164 in KApplication::notify (this=0xbfbe83dc, receiver=0x9c87270, event=0xbfbe7e44) at ../../kdeui/kernel/kapplication.cpp:311
#35 0xb6081eda in QCoreApplication::notifyInternal (this=0xbfbe83dc, receiver=receiver@entry=0x9c87270, event=event@entry=0xbfbe7e44) at kernel/qcoreapplication.cpp:946
#36 0xb6660aa3 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#37 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x9c87270, event=0xbfbe7e44, alienWidget=0x0, nativeWidget=0x9c87270, buttonDown=buttonDown@entry=0xb6fcfcc4 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3178
#38 0xb66e44e8 in QETWidget::translateMouseEvent (this=0x9c87270, event=event@entry=0xbfbe806c) at kernel/qapplication_x11.cpp:4631
#39 0xb66e3c05 in QApplication::x11ProcessEvent (this=0xbfbe83dc, event=event@entry=0xbfbe806c) at kernel/qapplication_x11.cpp:3624
#40 0xb670f274 in x11EventSourceDispatch (s=0x9268240, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#41 0xb288d83e in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#42 0xb288dbe8 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#43 0xb288dca8 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#44 0xb60b18bf in QEventDispatcherGlib::processEvents (this=this@entry=0x9232ec0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#45 0xb670f32e in QGuiEventDispatcherGlib::processEvents (this=0x9232ec0, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#46 0xb60809f3 in QEventLoop::processEvents (this=this@entry=0xbfbe8328, flags=...) at kernel/qeventloop.cpp:149
#47 0xb6080d19 in QEventLoop::exec (this=this@entry=0xbfbe8328, flags=...) at kernel/qeventloop.cpp:204
#48 0xb608689e in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#49 0xb6658974 in QApplication::exec () at kernel/qapplication.cpp:3828
#50 0x08050490 in main (argc=5, argv=0xbfbe84b4) at ../../../systemsettings/app/main.cpp:49

Possible duplicates by query: bug 327789, bug 323682, bug 320940.

Reported using DrKonqi