Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-15-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- Unusual behavior I noticed:

Kde or plasma crashes very often for no obvious reasons

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fd41f1a27c0 (LWP 1768))]

Thread 4 (Thread 0x7fd3fb6f6700 (LWP 1772)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007fd3fb6f5ab0 in ?? ()
#2  0x00007fff283d97e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 3 (Thread 0x7fd3f6268700 (LWP 1777)):
#0  __pthread_mutex_lock (mutex=0x1c365a8) at pthread_mutex_lock.c:127
#1  0x00007fd41310d414 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd41bd73f3e in QEventDispatcherGlib::processEvents (this=0x1c36580, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#3  0x00007fd41bd47cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#4  0x00007fd41bd47ef7 in QEventLoop::exec (this=0x7fd3f6267d90, flags=...) at kernel/qeventloop.cpp:201
#5  0x00007fd41bc5f27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#6  0x00007fd41bd2acbf in QInotifyFileSystemWatcherEngine::run (this=0x1c35c00) at io/qfilesystemwatcher_inotify.cpp:248
#7  0x00007fd41bc61d05 in QThreadPrivate::start (arg=0x1c35c00) at thread/qthread_unix.cpp:331
#8  0x00007fd413c19efc in start_thread (arg=0x7fd3f6268700) at pthread_create.c:304
#9  0x00007fd41eb8e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fd3ed99c700 (LWP 1782)):
#0  0x00007fd413c1c02d in __pthread_mutex_lock (mutex=0x2255f68) at pthread_mutex_lock.c:61
#1  0x00007fd41310b649 in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd41310cd81 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd41310d792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fd3ee47a516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007fd4131322b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007fd413c19efc in start_thread (arg=0x7fd3ed99c700) at pthread_create.c:304
#7  0x00007fd41eb8e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fd41f1a27c0 (LWP 1768)):
[KCrash Handler]
#6  isNull (this=0x404e800000000000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x404e800000000000) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x449e960) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007fd402ee1112 in WindowTaskItem::publishIconGeometry (this=0x2517340) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007fd402eefb7c in AbstractTaskItem::timerEvent (this=0x2517340, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007fd41bd5f789 in QObject::event (this=0x2517340, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007fd41b71789b in QGraphicsWidget::event (this=0x2517340, event=0x7fff282ba840) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007fd41b0f9424 in notify_helper (e=0x7fff282ba840, receiver=0x2517340, this=0x9baa30) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x9baa30, receiver=0x2517340, e=0x7fff282ba840) at kernel/qapplication.cpp:4458
#15 0x00007fd41b0fe291 in QApplication::notify (this=0x9abe90, receiver=0x2517340, e=0x7fff282ba840) at kernel/qapplication.cpp:4365
#16 0x00007fd41c9f7126 in KApplication::notify (this=0x9abe90, receiver=0x2517340, event=0x7fff282ba840) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007fd41bd48afc in QCoreApplication::notifyInternal (this=0x9abe90, receiver=0x2517340, event=0x7fff282ba840) at kernel/qcoreapplication.cpp:787
#18 0x00007fd41bd75d62 in sendEvent (event=0x7fff282ba840, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x9ba0a0) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007fd41bd73538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007fd41310ca5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fd41310d258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fd41310d429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fd41bd73ed6 in QEventDispatcherGlib::processEvents (this=0x948f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007fd41b1a107e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007fd41bd47cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007fd41bd47ef7 in QEventLoop::exec (this=0x7fff282baad0, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007fd41bd4c789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007fd41ee8d1a3 in kdemain (argc=1, argv=0x7fff282baeb8) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007fd41eace30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff282baeb8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff282baea8) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 292361, bug 292341, bug 292310, bug 292271, bug 292267.

Reported using DrKonqi