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:
I was alt-tabbing through a set of windows on a desktop when plasma unexpectedly crashed.  Nothing was apparently different from all the times before when I did the same thing.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f7d4a96f7a0 (LWP 2318))]

Thread 4 (Thread 0x7f7d27c75700 (LWP 2319)):
#0  0x00007f7d4a255773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f7d3e7dff68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7d3e7e0429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7d47446f3e in QEventDispatcherGlib::processEvents (this=0x1784dc0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f7d4741acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f7d4741aef7 in QEventLoop::exec (this=0x7f7d27c74db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f7d4733227f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f7d473fdcbf in QInotifyFileSystemWatcherEngine::run (this=0x1780fe0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f7d47334d05 in QThreadPrivate::start (arg=0x1780fe0) at thread/qthread_unix.cpp:331
#9  0x00007f7d3f2ecefc in start_thread (arg=0x7f7d27c75700) at pthread_create.c:304
#10 0x00007f7d4a26189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f7d25194700 (LWP 2320)):
#0  0x00007fffc0fff7ef in ?? ()
#1  0x00007f7d3ea9507b in __GI_clock_gettime (clock_id=1, tp=0x7f7d25193b20) at ../sysdeps/unix/clock_gettime.c:100
#2  0x00007f7d47385074 in do_gettime (frac=0x7f7d25193b38, sec=0x7f7d25193b30) at tools/qelapsedtimer_unix.cpp:123
#3  qt_gettime () at tools/qelapsedtimer_unix.cpp:140
#4  0x00007f7d474476ed in QTimerInfoList::updateCurrentTime (this=0x1999fc0) at kernel/qeventdispatcher_unix.cpp:339
#5  0x00007f7d47447a33 in QTimerInfoList::timerWait (this=0x1999fc0, tm=...) at kernel/qeventdispatcher_unix.cpp:442
#6  0x00007f7d4744644c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7f7d25193c1c) at kernel/qeventdispatcher_glib.cpp:136
#7  0x00007f7d474464f5 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:169
#8  0x00007f7d3e7deff2 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9  0x00007f7d3e7dfdfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007f7d3e7e0429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007f7d47446f3e in QEventDispatcherGlib::processEvents (this=0x199a220, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#12 0x00007f7d4741acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#13 0x00007f7d4741aef7 in QEventLoop::exec (this=0x7f7d25193db0, flags=...) at kernel/qeventloop.cpp:201
#14 0x00007f7d4733227f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#15 0x00007f7d473fdcbf in QInotifyFileSystemWatcherEngine::run (this=0x1999500) at io/qfilesystemwatcher_inotify.cpp:248
#16 0x00007f7d47334d05 in QThreadPrivate::start (arg=0x1999500) at thread/qthread_unix.cpp:331
#17 0x00007f7d3f2ecefc in start_thread (arg=0x7f7d25194700) at pthread_create.c:304
#18 0x00007f7d4a26189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#19 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f7d1ddfc700 (LWP 2326)):
#0  0x00007f7d4a255773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f7d3e7dff68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f7d3e7e0792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f7d1e8da516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f7d3e8052b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f7d3f2ecefc in start_thread (arg=0x7f7d1ddfc700) at pthread_create.c:304
#6  0x00007f7d4a26189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f7d4a96f7a0 (LWP 2318)):
[KCrash Handler]
#6  operator== (value=0, this=0x34a51a20d) at /usr/include/qt4/QtCore/qbasicatomic.h:70
#7  isNull (this=0x44a7f20) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#8  operator! (this=0x44a7f20) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#9  TaskManager::TaskItem::task (this=<optimized out>) at ../../../libs/taskmanager/taskitem.cpp:113
#10 0x00007f7d314d3112 in WindowTaskItem::publishIconGeometry (this=0x4eeaf50) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#11 0x00007f7d314e1b7c in AbstractTaskItem::timerEvent (this=0x4eeaf50, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#12 0x00007f7d47432789 in QObject::event (this=0x4eeaf50, e=<optimized out>) at kernel/qobject.cpp:1181
#13 0x00007f7d46dea89b in QGraphicsWidget::event (this=0x4eeaf50, event=0x7fffc0ea7c20) at graphicsview/qgraphicswidget.cpp:1455
#14 0x00007f7d467cc424 in notify_helper (e=0x7fffc0ea7c20, receiver=0x4eeaf50, this=0xbcd9a0) at kernel/qapplication.cpp:4486
#15 QApplicationPrivate::notify_helper (this=0xbcd9a0, receiver=0x4eeaf50, e=0x7fffc0ea7c20) at kernel/qapplication.cpp:4458
#16 0x00007f7d467d1291 in QApplication::notify (this=0xbc2560, receiver=0x4eeaf50, e=0x7fffc0ea7c20) at kernel/qapplication.cpp:4365
#17 0x00007f7d480ca126 in KApplication::notify (this=0xbc2560, receiver=0x4eeaf50, event=0x7fffc0ea7c20) at ../../kdeui/kernel/kapplication.cpp:311
#18 0x00007f7d4741bafc in QCoreApplication::notifyInternal (this=0xbc2560, receiver=0x4eeaf50, event=0x7fffc0ea7c20) at kernel/qcoreapplication.cpp:787
#19 0x00007f7d47448d62 in sendEvent (event=0x7fffc0ea7c20, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#20 QTimerInfoList::activateTimers (this=0xbd08d0) at kernel/qeventdispatcher_unix.cpp:603
#21 0x00007f7d47446538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#22 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#23 0x00007f7d3e7dfa5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f7d3e7e0258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f7d3e7e0429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007f7d47446ed6 in QEventDispatcherGlib::processEvents (this=0xb51f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#27 0x00007f7d4687407e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#28 0x00007f7d4741acf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#29 0x00007f7d4741aef7 in QEventLoop::exec (this=0x7fffc0ea7eb0, flags=...) at kernel/qeventloop.cpp:201
#30 0x00007f7d4741f789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#31 0x00007f7d4a5601a3 in kdemain (argc=1, argv=0x7fffc0ea8298) at ../../../../plasma/desktop/shell/main.cpp:120
#32 0x00007f7d4a1a130d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffc0ea8298, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffc0ea8288) at libc-start.c:226
#33 0x0000000000400671 in _start ()

Possible duplicates by query: bug 291905, bug 291893, bug 291785, bug 291689, bug 291619.

Reported using DrKonqi