Bug 290870

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: I was closing a virtual box windows guest and then attempted to swirch to a konquer task that was already running.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fa54cbc27a0 (LWP 17502))]

Thread 4 (Thread 0x7fa529623700 (LWP 17503)):
#0  0x00007fa540a2142c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fa549687f3e in QEventDispatcherGlib::processEvents (this=0xdf5fd0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#2  0x00007fa54965bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#3  0x00007fa54965bef7 in QEventLoop::exec (this=0x7fa529622db0, flags=...) at kernel/qeventloop.cpp:201
#4  0x00007fa54957327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#5  0x00007fa54963ecbf in QInotifyFileSystemWatcherEngine::run (this=0xdf53b0) at io/qfilesystemwatcher_inotify.cpp:248
#6  0x00007fa549575d05 in QThreadPrivate::start (arg=0xdf53b0) at thread/qthread_unix.cpp:331
#7  0x00007fa54152defc in start_thread (arg=0x7fa529623700) at pthread_create.c:304
#8  0x00007fa54c4a289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#9  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fa523fff700 (LWP 17507)):
#0  0x00007fa5415311fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0xf7e7f8) at pthread_mutex_unlock.c:290
#2  0x00007fa540a21013 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa540a21429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa549687f3e in QEventDispatcherGlib::processEvents (this=0xf7a410, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007fa54965bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007fa54965bef7 in QEventLoop::exec (this=0x7fa523ffedb0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007fa54957327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007fa54963ecbf in QInotifyFileSystemWatcherEngine::run (this=0xed2000) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007fa549575d05 in QThreadPrivate::start (arg=0xed2000) at thread/qthread_unix.cpp:331
#10 0x00007fa54152defc in start_thread (arg=0x7fa523fff700) at pthread_create.c:304
#11 0x00007fa54c4a289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fa521843700 (LWP 17510)):
#0  0x00007fa54c496773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fa540a20f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa540a21792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa522321516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fa540a462b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fa54152defc in start_thread (arg=0x7fa521843700) at pthread_create.c:304
#6  0x00007fa54c4a289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa54cbc27a0 (LWP 17502)):
[KCrash Handler]
#6  isNull (this=0x6c000000226e60) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x6c000000226e60) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x7fa524144cf0) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007fa53285d112 in WindowTaskItem::publishIconGeometry (this=0x102e630) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007fa53286bb7c in AbstractTaskItem::timerEvent (this=0x102e630, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007fa549673789 in QObject::event (this=0x102e630, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007fa54902b89b in QGraphicsWidget::event (this=0x102e630, event=0x7fffb2d29f30) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007fa548a0d424 in notify_helper (e=0x7fffb2d29f30, receiver=0x102e630, this=0x68dea0) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x68dea0, receiver=0x102e630, e=0x7fffb2d29f30) at kernel/qapplication.cpp:4458
#15 0x00007fa548a12291 in QApplication::notify (this=0x67e7c0, receiver=0x102e630, e=0x7fffb2d29f30) at kernel/qapplication.cpp:4365
#16 0x00007fa54a30b126 in KApplication::notify (this=0x67e7c0, receiver=0x102e630, event=0x7fffb2d29f30) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007fa54965cafc in QCoreApplication::notifyInternal (this=0x67e7c0, receiver=0x102e630, event=0x7fffb2d29f30) at kernel/qcoreapplication.cpp:787
#18 0x00007fa549689d62 in sendEvent (event=0x7fffb2d29f30, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x68c0d0) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007fa549687538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007fa540a20a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fa540a21258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fa540a21429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fa549687ed6 in QEventDispatcherGlib::processEvents (this=0x611f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007fa548ab507e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007fa54965bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007fa54965bef7 in QEventLoop::exec (this=0x7fffb2d2a1c0, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007fa549660789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007fa54c7a11a3 in kdemain (argc=1, argv=0x7fffb2d2a5a8) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007fa54c3e230d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffb2d2a5a8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffb2d2a598) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 290859, bug 290813, bug 290810, bug 290795, bug 290761.

Reported using DrKonqi