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:
- Using Firefox
- Using Thunderbird email client
- Using Dolphin
- Terminal (konsole)

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f3f77ed77a0 (LWP 1674))]

Thread 4 (Thread 0x7f3f5b432700 (LWP 1675)):
#0  0x00007f3f777b5773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f3f6bd3ff68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3f6bd40429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3f749a6f3e in QEventDispatcherGlib::processEvents (this=0x1796f80, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f3f7497acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f3f7497aef7 in QEventLoop::exec (this=0x7f3f5b431db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f3f7489227f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f3f7495dcbf in QInotifyFileSystemWatcherEngine::run (this=0x179bfa0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f3f74894d05 in QThreadPrivate::start (arg=0x179bfa0) at thread/qthread_unix.cpp:331
#9  0x00007f3f6c84cefc in start_thread (arg=0x7f3f5b432700) at pthread_create.c:304
#10 0x00007f3f777c189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f3f4df46700 (LWP 1676)):
#0  0x00007f3f777b5773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f3f6bd3ff68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3f6bd40429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3f749a6f3e in QEventDispatcherGlib::processEvents (this=0x13114a0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f3f7497acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f3f7497aef7 in QEventLoop::exec (this=0x7f3f4df45db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f3f7489227f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f3f7495dcbf in QInotifyFileSystemWatcherEngine::run (this=0x1c60530) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f3f74894d05 in QThreadPrivate::start (arg=0x1c60530) at thread/qthread_unix.cpp:331
#9  0x00007f3f6c84cefc in start_thread (arg=0x7f3f4df46700) at pthread_create.c:304
#10 0x00007f3f777c189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f3f485e0700 (LWP 1685)):
#0  0x00007f3f777b5773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f3f6bd3ff68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f3f6bd40792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f3f490be516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f3f6bd652b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f3f6c84cefc in start_thread (arg=0x7f3f485e0700) at pthread_create.c:304
#6  0x00007f3f777c189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f3f77ed77a0 (LWP 1674)):
[KCrash Handler]
#6  isNull (this=0x3fba36e2eb1c4300) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x3fba36e2eb1c4300) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x24a5470) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f3f5da54112 in WindowTaskItem::publishIconGeometry (this=0x22239d0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f3f5da62b7c in AbstractTaskItem::timerEvent (this=0x22239d0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f3f74992789 in QObject::event (this=0x22239d0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f3f7434a89b in QGraphicsWidget::event (this=0x22239d0, event=0x7fff1fcb2220) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f3f73d2c424 in notify_helper (e=0x7fff1fcb2220, receiver=0x22239d0, this=0x10412b0) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x10412b0, receiver=0x22239d0, e=0x7fff1fcb2220) at kernel/qapplication.cpp:4458
#15 0x00007f3f73d31291 in QApplication::notify (this=0x1036410, receiver=0x22239d0, e=0x7fff1fcb2220) at kernel/qapplication.cpp:4365
#16 0x00007f3f7562a126 in KApplication::notify (this=0x1036410, receiver=0x22239d0, event=0x7fff1fcb2220) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f3f7497bafc in QCoreApplication::notifyInternal (this=0x1036410, receiver=0x22239d0, event=0x7fff1fcb2220) at kernel/qcoreapplication.cpp:787
#18 0x00007f3f749a8d62 in sendEvent (event=0x7fff1fcb2220, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x1040600) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f3f749a6538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f3f6bd3fa5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f3f6bd40258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f3f6bd40429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f3f749a6ed6 in QEventDispatcherGlib::processEvents (this=0xfc9f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f3f73dd407e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f3f7497acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f3f7497aef7 in QEventLoop::exec (this=0x7fff1fcb24b0, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f3f7497f789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f3f77ac01a3 in kdemain (argc=1, argv=0x7fff1fcb2898) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f3f7770130d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff1fcb2898, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff1fcb2888) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 290507, bug 290506, bug 290505, bug 290499, bug 290453.

Reported using DrKonqi