Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-12-generic-pae i686
Distribution: Ubuntu 11.10

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

Logoff and shutdown the computer. The system crashes only at times, not reproducible.

- Unusual behavior I noticed:

Sometimes, the system hangs (black screen), when I leave the computer for some time. A reboot is necessary then (magic sysrq or reset button). This happens also on a irregular basis (by chance), even though I disabled all energy option meanwhile.

All crashes occured using KDE 4.7.2 and 4.7.3 as well.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0xb1f7a940 (LWP 1883))]

Thread 3 (Thread 0xa6e1fb70 (LWP 1901)):
#0  0xb7732f48 in pthread_mutex_unlock () from /lib/i386-linux-gnu/libc.so.6
#1  0xb2ff787f in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0xb2ff8637 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2ff8c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb6570b37 in QEventDispatcherGlib::processEvents (this=0xa45a328, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#5  0xb65411dd in QEventLoop::processEvents (this=0xa6e1f2a0, flags=...) at kernel/qeventloop.cpp:149
#6  0xb6541421 in QEventLoop::exec (this=0xa6e1f2a0, flags=...) at kernel/qeventloop.cpp:201
#7  0xb644490b in QThread::exec (this=0xa185190) at thread/qthread.cpp:498
#8  0xb6521e2d in QInotifyFileSystemWatcherEngine::run (this=0xa185190) at io/qfilesystemwatcher_inotify.cpp:248
#9  0xb64477b3 in QThreadPrivate::start (arg=0xa185190) at thread/qthread_unix.cpp:331
#10 0xb3112d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#11 0xb77250ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 2 (Thread 0xa5837b70 (LWP 1904)):
#0  0xb3114dbd in pthread_mutex_lock () from /lib/i386-linux-gnu/libpthread.so.0
#1  0xb7732f14 in pthread_mutex_lock () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2ff78bb in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2ff8637 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2ff8c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb6570b37 in QEventDispatcherGlib::processEvents (this=0xa77d9f0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#6  0xb65411dd in QEventLoop::processEvents (this=0xa58372a0, flags=...) at kernel/qeventloop.cpp:149
#7  0xb6541421 in QEventLoop::exec (this=0xa58372a0, flags=...) at kernel/qeventloop.cpp:201
#8  0xb644490b in QThread::exec (this=0xa77c308) at thread/qthread.cpp:498
#9  0xb6521e2d in QInotifyFileSystemWatcherEngine::run (this=0xa77c308) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb64477b3 in QThreadPrivate::start (arg=0xa77c308) at thread/qthread_unix.cpp:331
#11 0xb3112d31 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb77250ce in clone () from /lib/i386-linux-gnu/libc.so.6
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 1 (Thread 0xb1f7a940 (LWP 1883)):
[KCrash Handler]
#7  ref (this=<optimized out>) at /usr/include/qt4/QtCore/qatomic_i386.h:120
#8  KSharedPtr (p=0x0, this=0xbfe3c098) at /usr/include/KDE/../ksharedptr.h:77
#9  TaskManager::TaskItem::task (this=0xab3e7a0) at ../../../libs/taskmanager/taskitem.cpp:116
#10 0xb04a2662 in WindowTaskItem::publishIconGeometry (this=0xb263520) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#11 0xb04b3688 in AbstractTaskItem::timerEvent (this=0xb263520, event=0xbfe3c56c) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#12 0xb655a994 in QObject::event (this=0xb263520, e=0xbfe3c56c) at kernel/qobject.cpp:1181
#13 0xb612cbd4 in QGraphicsWidget::event (this=0xb263520, event=0xbfe3c56c) at graphicsview/qgraphicswidget.cpp:1455
#14 0xb5a6dd54 in notify_helper (e=0xbfe3c56c, receiver=0xb263520, this=0x9aa4d90) at kernel/qapplication.cpp:4486
#15 QApplicationPrivate::notify_helper (this=0x9aa4d90, receiver=0xb263520, e=0xbfe3c56c) at kernel/qapplication.cpp:4458
#16 0xb5a73103 in QApplication::notify (this=0xbfe3c56c, receiver=0xb263520, e=0xbfe3c56c) at kernel/qapplication.cpp:3886
#17 0xb6ba7681 in KApplication::notify (this=0x9a8af38, receiver=0xb263520, event=0xbfe3c56c) at ../../kdeui/kernel/kapplication.cpp:311
#18 0xb654219e in QCoreApplication::notifyInternal (this=0x9a8af38, receiver=0xb263520, event=0xbfe3c56c) at kernel/qcoreapplication.cpp:787
#19 0xb6572c10 in sendEvent (event=0xbfe3c56c, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#20 QTimerInfoList::activateTimers (this=0x9aa2734) at kernel/qeventdispatcher_unix.cpp:603
#21 0xb6570155 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#22 idleTimerSourceDispatch (source=0x9aa2768) at kernel/qeventdispatcher_glib.cpp:231
#23 0xb2ff825f in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#24 0xb2ff8990 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#25 0xb2ff8c2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#26 0xb6570ada in QEventDispatcherGlib::processEvents (this=0x9a49248, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#27 0xb5b25e3a in QGuiEventDispatcherGlib::processEvents (this=0x9a49248, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#28 0xb65411dd in QEventLoop::processEvents (this=0xbfe3c7e4, flags=...) at kernel/qeventloop.cpp:149
#29 0xb6541421 in QEventLoop::exec (this=0xbfe3c7e4, flags=...) at kernel/qeventloop.cpp:201
#30 0xb654619d in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#31 0xb5a6b8f4 in QApplication::exec () at kernel/qapplication.cpp:3760
#32 0xb782018b in kdemain (argc=1, argv=0xbfe3c9e4) at ../../../../plasma/desktop/shell/main.cpp:120
#33 0x0804850b in main (argc=1, argv=0xbfe3c9e4) at plasma-desktop_dummy.cpp:3

This bug may be a duplicate of or related to bug 284989.

Possible duplicates by query: bug 286329.

Reported using DrKonqi