Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.1.6-030106-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
I was just saving file in Firefox. It happens from time to time.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Powłoka pulpitu Plazmy (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f11867bf7a0 (LWP 1550))]

Thread 3 (Thread 0x7f1163e6b700 (LWP 1552)):
#0  0x00007fff587be7b6 in ?? ()
#1  0x00007f117a8cf07b in __GI_clock_gettime (clock_id=1, tp=0x7f1163e6ab20) at ../sysdeps/unix/clock_gettime.c:100
#2  0x00007f11831bf074 in do_gettime (frac=0x7f1163e6ab38, sec=0x7f1163e6ab30) at tools/qelapsedtimer_unix.cpp:123
#3  qt_gettime () at tools/qelapsedtimer_unix.cpp:140
#4  0x00007f11832816ed in QTimerInfoList::updateCurrentTime (this=0x1b6a950) at kernel/qeventdispatcher_unix.cpp:339
#5  0x00007f1183281a33 in QTimerInfoList::timerWait (this=0x1b6a950, tm=...) at kernel/qeventdispatcher_unix.cpp:442
#6  0x00007f118328044c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7f1163e6ac1c) at kernel/qeventdispatcher_glib.cpp:136
#7  0x00007f11832804f5 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:169
#8  0x00007f117a618ff2 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f117a619dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f117a61a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f1183280f3e in QEventDispatcherGlib::processEvents (this=0x1b62290, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#12 0x00007f1183254cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#13 0x00007f1183254ef7 in QEventLoop::exec (this=0x7f1163e6adb0, flags=...) at kernel/qeventloop.cpp:201
#14 0x00007f118316c27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#15 0x00007f1183237cbf in QInotifyFileSystemWatcherEngine::run (this=0x1b5e130) at io/qfilesystemwatcher_inotify.cpp:248
#16 0x00007f118316ed05 in QThreadPrivate::start (arg=0x1b5e130) at thread/qthread_unix.cpp:331
#17 0x00007f117b126efc in start_thread (arg=0x7f1163e6b700) at pthread_create.c:304
#18 0x00007f118609b89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#19 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f1161379700 (LWP 1553)):
#0  __pthread_mutex_lock (mutex=0x1) at pthread_mutex_lock.c:47
#1  0x00007f117a61a044 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f117a61a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f1183280f3e in QEventDispatcherGlib::processEvents (this=0x1d77410, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f1183254cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f1183254ef7 in QEventLoop::exec (this=0x7f1161378db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f118316c27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f1183237cbf in QInotifyFileSystemWatcherEngine::run (this=0x1d79490) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f118316ed05 in QThreadPrivate::start (arg=0x1d79490) at thread/qthread_unix.cpp:331
#9  0x00007f117b126efc in start_thread (arg=0x7f1161379700) at pthread_create.c:304
#10 0x00007f118609b89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f11867bf7a0 (LWP 1550)):
[KCrash Handler]
#6  operator== (value=0, this=0xd) at /usr/include/qt4/QtCore/qbasicatomic.h:70
#7  isNull (this=0x2555cf0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#8  operator! (this=0x2555cf0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#9  TaskManager::TaskItem::task (this=<optimized out>) at ../../../libs/taskmanager/taskitem.cpp:113
#10 0x00007f116c916068 in WindowTaskItem::publishIconGeometry (this=0x23b0d50, rect=...) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:130
#11 0x00007f116c925d24 in TaskGroupItem::publishIconGeometry (this=<optimized out>, rect=...) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1432
#12 0x00007f116c925aa5 in publishIconGeometry (this=0x2879930) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1424
#13 TaskGroupItem::publishIconGeometry (this=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:1416
#14 0x00007f116c924b7c in AbstractTaskItem::timerEvent (this=0x2879930, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#15 0x00007f118326c789 in QObject::event (this=0x2879930, e=<optimized out>) at kernel/qobject.cpp:1181
#16 0x00007f1182c2489b in QGraphicsWidget::event (this=0x2879930, event=0x7fff5867fae0) at graphicsview/qgraphicswidget.cpp:1455
#17 0x00007f1182606424 in notify_helper (e=0x7fff5867fae0, receiver=0x2879930, this=0x1366930) at kernel/qapplication.cpp:4486
#18 QApplicationPrivate::notify_helper (this=0x1366930, receiver=0x2879930, e=0x7fff5867fae0) at kernel/qapplication.cpp:4458
#19 0x00007f118260b291 in QApplication::notify (this=0x1346890, receiver=0x2879930, e=0x7fff5867fae0) at kernel/qapplication.cpp:4365
#20 0x00007f1183f04126 in KApplication::notify (this=0x1346890, receiver=0x2879930, event=0x7fff5867fae0) at ../../kdeui/kernel/kapplication.cpp:311
#21 0x00007f1183255afc in QCoreApplication::notifyInternal (this=0x1346890, receiver=0x2879930, event=0x7fff5867fae0) at kernel/qcoreapplication.cpp:787
#22 0x00007f1183282d62 in sendEvent (event=0x7fff5867fae0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#23 QTimerInfoList::activateTimers (this=0x1365fd0) at kernel/qeventdispatcher_unix.cpp:603
#24 0x00007f1183280514 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#25 0x00007f117a619a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f117a61a258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007f117a61a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007f1183280ed6 in QEventDispatcherGlib::processEvents (this=0x12ebf40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#29 0x00007f11826ae07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007f1183254cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007f1183254ef7 in QEventLoop::exec (this=0x7fff5867fd70, flags=...) at kernel/qeventloop.cpp:201
#32 0x00007f1183259789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#33 0x00007f118639a1a3 in kdemain (argc=1, argv=0x7fff58680158) at ../../../../plasma/desktop/shell/main.cpp:120
#34 0x00007f1185fdb30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff58680158, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff58680148) at libc-start.c:226
#35 0x0000000000400671 in _start ()

Possible duplicates by query: bug 290071, bug 289985, bug 289940, bug 289826, bug 289676.

Reported using DrKonqi