Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-14-generic-pae i686
Distribution: Ubuntu 11.10

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

Moving among apps and the "show desktop", including Mozilla Firefox, Mozilla Thunderbird, Libre Office, Konsole

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb1f19b20 (LWP 1721))]

Thread 4 (Thread 0xb03ffb70 (LWP 1728)):
#0  0xb3052d44 in __pthread_mutex_unlock_usercnt () from /lib/i386-linux-gnu/libpthread.so.0
#1  0xb766ff54 in pthread_mutex_unlock () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2f3487f in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2f35637 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2f35f9b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb15e9cea in ?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#6  0xb2f5c5f4 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#7  0xb304fd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#8  0xb76620ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 3 (Thread 0xadf59b70 (LWP 1729)):
#0  0xb77a0424 in __kernel_vsyscall ()
#1  0xb765340e in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2f4434b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2f35896 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2f35c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb64adb37 in QEventDispatcherGlib::processEvents (this=0xb04059d0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0xb647e1dd in QEventLoop::processEvents (this=0xadf592a0, flags=...) at kernel/qeventloop.cpp:149
#7  0xb647e421 in QEventLoop::exec (this=0xadf592a0, flags=...) at kernel/qeventloop.cpp:201
#8  0xb638190b in QThread::exec (this=0xa3d6928) at thread/qthread.cpp:498
#9  0xb645ee2d in QInotifyFileSystemWatcherEngine::run (this=0xa3d6928) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb63847b3 in QThreadPrivate::start (arg=0xa3d6928) at thread/qthread_unix.cpp:331
#11 0xb304fd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb76620ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 2 (Thread 0xa7747b70 (LWP 1731)):
#0  0xb77a0424 in __kernel_vsyscall ()
#1  0xb765340e in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2f4434b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2f35896 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2f35c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb64adb37 in QEventDispatcherGlib::processEvents (this=0xa438780, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0xb647e1dd in QEventLoop::processEvents (this=0xa77472a0, flags=...) at kernel/qeventloop.cpp:149
#7  0xb647e421 in QEventLoop::exec (this=0xa77472a0, flags=...) at kernel/qeventloop.cpp:201
#8  0xb638190b in QThread::exec (this=0x9f4e1d0) at thread/qthread.cpp:498
#9  0xb645ee2d in QInotifyFileSystemWatcherEngine::run (this=0x9f4e1d0) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb63847b3 in QThreadPrivate::start (arg=0x9f4e1d0) at thread/qthread_unix.cpp:331
#11 0xb304fd31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb76620ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 1 (Thread 0xb1f19b20 (LWP 1721)):
[KCrash Handler]
#7  operator== (value=0, this=0x9) at /usr/include/qt4/QtCore/qbasicatomic.h:70
#8  isNull (this=0xaff82d0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#9  operator! (this=0xaff82d0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#10 TaskManager::TaskItem::task (this=0xb23a8e8) at ../../../libs/taskmanager/taskitem.cpp:113
#11 0xaeb8f590 in WindowTaskItem::publishIconGeometry (this=0xb220320, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#12 0xaeba1b24 in TaskGroupItem::publishIconGeometry (this=0xb13ce70, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1438
#13 0xaeba1801 in publishIconGeometry (this=0xb13ce70) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#14 TaskGroupItem::publishIconGeometry (this=0xb13ce70) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#15 0xaeba0688 in AbstractTaskItem::timerEvent (this=0xb13ce70, event=0xbfad31bc) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#16 0xb6497994 in QObject::event (this=0xb13ce70, e=0xbfad31bc) at kernel/qobject.cpp:1181
#17 0xb6069bd4 in QGraphicsWidget::event (this=0xb13ce70, event=0xbfad31bc) at graphicsview/qgraphicswidget.cpp:1455
#18 0xb59aad54 in notify_helper (e=0xbfad31bc, receiver=0xb13ce70, this=0x9a60220) at kernel/qapplication.cpp:4486
#19 QApplicationPrivate::notify_helper (this=0x9a60220, receiver=0xb13ce70, e=0xbfad31bc) at kernel/qapplication.cpp:4458
#20 0xb59b0103 in QApplication::notify (this=0xbfad31bc, receiver=0xb13ce70, e=0xbfad31bc) at kernel/qapplication.cpp:3886
#21 0xb6ae4681 in KApplication::notify (this=0x9a44b88, receiver=0xb13ce70, event=0xbfad31bc) at ../../kdeui/kernel/kapplication.cpp:311
#22 0xb647f19e in QCoreApplication::notifyInternal (this=0x9a44b88, receiver=0xb13ce70, event=0xbfad31bc) at kernel/qcoreapplication.cpp:787
#23 0xb64afc10 in sendEvent (event=0xbfad31bc, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#24 QTimerInfoList::activateTimers (this=0x9a5d974) at kernel/qeventdispatcher_unix.cpp:603
#25 0xb64ad155 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#26 idleTimerSourceDispatch (source=0x9a5d9a8) at kernel/qeventdispatcher_glib.cpp:231
#27 0xb2f3525f in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#28 0xb2f35990 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#29 0xb2f35c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#30 0xb64adada in QEventDispatcherGlib::processEvents (this=0x9a0e218, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#31 0xb5a62e3a in QGuiEventDispatcherGlib::processEvents (this=0x9a0e218, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#32 0xb647e1dd in QEventLoop::processEvents (this=0xbfad3434, flags=...) at kernel/qeventloop.cpp:149
#33 0xb647e421 in QEventLoop::exec (this=0xbfad3434, flags=...) at kernel/qeventloop.cpp:201
#34 0xb648319d in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#35 0xb59a88f4 in QApplication::exec () at kernel/qapplication.cpp:3760
#36 0xb775518b in kdemain (argc=1, argv=0xbfad3634) at ../../../../plasma/desktop/shell/main.cpp:120
#37 0x0804850b in main (argc=1, argv=0xbfad3634) at plasma-desktop_dummy.cpp:3

Possible duplicates by query: bug 290152, bug 290081, bug 290071, bug 289985, bug 289940.

Reported using DrKonqi