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 x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
Sometimes it happens that Plasma crashes when I close some application and while it's being closed I switch to another one.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f2595bfb7a0 (LWP 1700))]

Thread 4 (Thread 0x7f2574993700 (LWP 1701)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007f2574992ad0 in ?? ()
#2  0x00007fff0e3fa7e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 3 (Thread 0x7f2571e8d700 (LWP 1702)):
#0  0x00007f258a57a1fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x2b28488) at pthread_mutex_unlock.c:290
#2  0x00007f2589a693f5 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2589a69e6a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2589a6a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f25926d0f3e in QEventDispatcherGlib::processEvents (this=0x2b28460, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007f25926a4cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f25926a4ef7 in QEventLoop::exec (this=0x7f2571e8cdb0, flags=...) at kernel/qeventloop.cpp:201
#8  0x00007f25925bc27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#9  0x00007f2592687cbf in QInotifyFileSystemWatcherEngine::run (this=0x2b278c0) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007f25925bed05 in QThreadPrivate::start (arg=0x2b278c0) at thread/qthread_unix.cpp:331
#11 0x00007f258a576efc in start_thread (arg=0x7f2571e8d700) at pthread_create.c:304
#12 0x00007f25954eb89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f2568225700 (LWP 1710)):
#0  pthread_mutex_lock (mutex=0x315cdd8) at forward.c:182
#1  0x00007f2589a694ca in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2589a69f82 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f2589a6a792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f2568d03516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007f2589a8f2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f258a576efc in start_thread (arg=0x7f2568225700) at pthread_create.c:304
#7  0x00007f25954eb89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f2595bfb7a0 (LWP 1700)):
[KCrash Handler]
#6  isNull (this=0x181000300000001) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x181000300000001) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x2db3b30) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f257c2ec112 in WindowTaskItem::publishIconGeometry (this=0x46e2aa0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f257c2fab7c in AbstractTaskItem::timerEvent (this=0x46e2aa0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f25926bc789 in QObject::event (this=0x46e2aa0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f259207489b in QGraphicsWidget::event (this=0x46e2aa0, event=0x7fff0e3850d0) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f2591a56424 in notify_helper (e=0x7fff0e3850d0, receiver=0x46e2aa0, this=0x2012320) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x2012320, receiver=0x46e2aa0, e=0x7fff0e3850d0) at kernel/qapplication.cpp:4458
#15 0x00007f2591a5b291 in QApplication::notify (this=0x2007150, receiver=0x46e2aa0, e=0x7fff0e3850d0) at kernel/qapplication.cpp:4365
#16 0x00007f2593354126 in KApplication::notify (this=0x2007150, receiver=0x46e2aa0, event=0x7fff0e3850d0) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f25926a5afc in QCoreApplication::notifyInternal (this=0x2007150, receiver=0x46e2aa0, event=0x7fff0e3850d0) at kernel/qcoreapplication.cpp:787
#18 0x00007f25926d2d62 in sendEvent (event=0x7fff0e3850d0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x2016e90) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f25926d0514 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 0x00007f2589a69a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007f2589a6a258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f2589a6a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f25926d0ed6 in QEventDispatcherGlib::processEvents (this=0x1fa6f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#25 0x00007f2591afe07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#26 0x00007f25926a4cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#27 0x00007f25926a4ef7 in QEventLoop::exec (this=0x7fff0e385360, flags=...) at kernel/qeventloop.cpp:201
#28 0x00007f25926a9789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#29 0x00007f25957ea1a3 in kdemain (argc=1, argv=0x7fff0e385748) at ../../../../plasma/desktop/shell/main.cpp:120
#30 0x00007f259542b30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff0e385748, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff0e385738) at libc-start.c:226
#31 0x0000000000400671 in _start ()

This bug may be a duplicate of or related to bug 288866.

Possible duplicates by query: bug 289714, bug 289704, bug 289683, bug 289676, bug 289669.

Reported using DrKonqi