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:
when closing apps, this time vlc, plasma crash. i can see black screen and after a recharge of the desktop.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Shell del desktop di Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7faf0a0ba7c0 (LWP 3271))]

Thread 3 (Thread 0x7faee18cc700 (LWP 4463)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007faee18cb9f0 in ?? ()
#2  0x00007ffff5bad7e7 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 2 (Thread 0x7faed5552700 (LWP 4477)):
#0  0x00007faefea3402d in __pthread_mutex_lock (mutex=0x24dd7f8) at pthread_mutex_lock.c:61
#1  0x00007faefdf248c2 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007faefdf25258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007faefdf25429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007faf06b8bf3e in QEventDispatcherGlib::processEvents (this=0x24dd410, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007faf06b5fcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007faf06b5fef7 in QEventLoop::exec (this=0x7faed5551cd0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007faf06a7727f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007faf06b42cbf in QInotifyFileSystemWatcherEngine::run (this=0x24dbb30) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007faf06a79d05 in QThreadPrivate::start (arg=0x24dbb30) at thread/qthread_unix.cpp:331
#10 0x00007faefb23e56c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#11 0x00007faefea31efc in start_thread (arg=0x7faed5552700) at pthread_create.c:304
#12 0x00007faf099a689d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7faf0a0ba7c0 (LWP 3271)):
[KCrash Handler]
#6  operator== (value=0, this=0x280000000d) at /usr/include/qt4/QtCore/qbasicatomic.h:70
#7  isNull (this=0x35fba00) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#8  operator! (this=0x35fba00) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#9  TaskManager::TaskItem::task (this=<optimized out>) at ../../../libs/taskmanager/taskitem.cpp:113
#10 0x00007faeeabf4068 in WindowTaskItem::publishIconGeometry (this=0x4007e20, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#11 0x00007faeeac03d24 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#12 0x00007faeeac03aa5 in publishIconGeometry (this=0x4007a90) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#13 TaskGroupItem::publishIconGeometry (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#14 0x00007faeeac02b7c in AbstractTaskItem::timerEvent (this=0x4007a90, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#15 0x00007faf06b77789 in QObject::event (this=0x4007a90, e=<optimized out>) at kernel/qobject.cpp:1181
#16 0x00007faf0652f89b in QGraphicsWidget::event (this=0x4007a90, event=0x7ffff5a59010) at graphicsview/qgraphicswidget.cpp:1455
#17 0x00007faf05f11424 in notify_helper (e=0x7ffff5a59010, receiver=0x4007a90, this=0xa35ba0) at kernel/qapplication.cpp:4486
#18 QApplicationPrivate::notify_helper (this=0xa35ba0, receiver=0x4007a90, e=0x7ffff5a59010) at kernel/qapplication.cpp:4458
#19 0x00007faf05f16291 in QApplication::notify (this=0xa26c20, receiver=0x4007a90, e=0x7ffff5a59010) at kernel/qapplication.cpp:4365
#20 0x00007faf0780f126 in KApplication::notify (this=0xa26c20, receiver=0x4007a90, event=0x7ffff5a59010) at ../../kdeui/kernel/kapplication.cpp:311
#21 0x00007faf06b60afc in QCoreApplication::notifyInternal (this=0xa26c20, receiver=0x4007a90, event=0x7ffff5a59010) at kernel/qcoreapplication.cpp:787
#22 0x00007faf06b8dd62 in sendEvent (event=0x7ffff5a59010, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#23 QTimerInfoList::activateTimers (this=0xa385d0) at kernel/qeventdispatcher_unix.cpp:603
#24 0x00007faf06b8b538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#25 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#26 0x00007faefdf24a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007faefdf25258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007faefdf25429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007faf06b8bed6 in QEventDispatcherGlib::processEvents (this=0x96df40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#30 0x00007faf05fb907e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#31 0x00007faf06b5fcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#32 0x00007faf06b5fef7 in QEventLoop::exec (this=0x7ffff5a592a0, flags=...) at kernel/qeventloop.cpp:201
#33 0x00007faf06b64789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#34 0x00007faf09ca51a3 in kdemain (argc=1, argv=0x7ffff5a59688) at ../../../../plasma/desktop/shell/main.cpp:120
#35 0x00007faf098e630d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7ffff5a59688, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff5a59678) at libc-start.c:226
#36 0x0000000000400671 in _start ()

Possible duplicates by query: bug 288866, bug 288759, bug 288635, bug 288553, bug 288468.

Reported using DrKonqi