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:
- What I was doing when the application crashed: I was closing/minimize/maximize some window

- Unusual behavior I noticed: I is crashing randomly no matter which application's window I close/min/maximize

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f9726b5d7c0 (LWP 2001))]

Thread 8 (Thread 0x7f970196c700 (LWP 2002)):
#0  0x00007f971b4dc034 in __pthread_mutex_lock (mutex=0x2695bd8) at pthread_mutex_lock.c:61
#1  0x00007f971a9cd414 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9723633f3e in QEventDispatcherGlib::processEvents (this=0x2695250, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#3  0x00007f9723607cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#4  0x00007f9723607ef7 in QEventLoop::exec (this=0x7f970196bcd0, flags=...) at kernel/qeventloop.cpp:201
#5  0x00007f972351f27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#6  0x00007f97235eacbf in QInotifyFileSystemWatcherEngine::run (this=0x267e2c0) at io/qfilesystemwatcher_inotify.cpp:248
#7  0x00007f9723521d05 in QThreadPrivate::start (arg=0x267e2c0) at thread/qthread_unix.cpp:331
#8  0x00007f9717ce656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#9  0x00007f971b4d9efc in start_thread (arg=0x7f970196c700) at pthread_create.c:304
#10 0x00007f972644e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f96fafbf700 (LWP 2003)):
#0  0x00007f9726442773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f971a9ccf68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f971a9cd429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9723633f3e in QEventDispatcherGlib::processEvents (this=0x28bd100, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f9723607cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9723607ef7 in QEventLoop::exec (this=0x7f96fafbecd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f972351f27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f97235eacbf in QInotifyFileSystemWatcherEngine::run (this=0x28bc650) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9723521d05 in QThreadPrivate::start (arg=0x28bc650) at thread/qthread_unix.cpp:331
#9  0x00007f9717ce656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f971b4d9efc in start_thread (arg=0x7f96fafbf700) at pthread_create.c:304
#11 0x00007f972644e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f96f6919700 (LWP 2007)):
#0  pthread_mutex_unlock (mutex=0x32f61b8) at forward.c:184
#1  0x00007f971a9cbfe4 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f971a9ccdfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f971a9cd792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f96f73f7516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007f971a9f22b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f9717ce656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#7  0x00007f971b4d9efc in start_thread (arg=0x7f96f6919700) at pthread_create.c:304
#8  0x00007f972644e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#9  0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f96ebfba700 (LWP 6371)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f97235221ab in wait (time=18446744073709551615, this=0x26b5470) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x26b5400, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f971f31c864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2777f90, th=0x44b6f80) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f971f31ee0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x26c2cb0, th=0x44b6f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f971f31ee24 in ThreadWeaver::WorkingHardState::applyForWork (this=0x26c2cb0, th=0x44b6f80) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f971f31dccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f96ebfb9d20, parent=0x2777f90, th=0x44b6f80) at ../../../threadweaver/Weaver/Thread.cpp:87
#7  0x00007f971f31dd5b in ThreadWeaver::Thread::run (this=0x44b6f80) at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007f9723521d05 in QThreadPrivate::start (arg=0x44b6f80) at thread/qthread_unix.cpp:331
#9  0x00007f9717ce656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f971b4d9efc in start_thread (arg=0x7f96ebfba700) at pthread_create.c:304
#11 0x00007f972644e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f96f711a700 (LWP 6372)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f97235221ab in wait (time=18446744073709551615, this=0x26b5470) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x26b5400, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f971f31c864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2777f90, th=0x26feb10) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f971f31ee0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x26c2cb0, th=0x26feb10) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f971f31dccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f96f7119d20, parent=0x2777f90, th=0x26feb10) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f971f31dd5b in ThreadWeaver::Thread::run (this=0x26feb10) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f9723521d05 in QThreadPrivate::start (arg=0x26feb10) at thread/qthread_unix.cpp:331
#8  0x00007f9717ce656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#9  0x00007f971b4d9efc in start_thread (arg=0x7f96f711a700) at pthread_create.c:304
#10 0x00007f972644e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f96f12d7700 (LWP 6373)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f97235221ab in wait (time=18446744073709551615, this=0x26b5470) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x26b5400, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f971f31c864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2777f90, th=0x4d2b5f0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f971f31ee0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x26c2cb0, th=0x4d2b5f0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f971f31dccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f96f12d6d20, parent=0x2777f90, th=0x4d2b5f0) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f971f31dd5b in ThreadWeaver::Thread::run (this=0x4d2b5f0) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f9723521d05 in QThreadPrivate::start (arg=0x4d2b5f0) at thread/qthread_unix.cpp:331
#8  0x00007f9717ce656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#9  0x00007f971b4d9efc in start_thread (arg=0x7f96f12d7700) at pthread_create.c:304
#10 0x00007f972644e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f96f0ad6700 (LWP 6374)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f97235221ab in wait (time=18446744073709551615, this=0x26b5470) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x26b5400, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f971f31c864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x2777f90, th=0x4819e30) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f971f31ee0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x26c2cb0, th=0x4819e30) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f971f31ee24 in ThreadWeaver::WorkingHardState::applyForWork (this=0x26c2cb0, th=0x4819e30) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f971f31dccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f96f0ad5d20, parent=0x2777f90, th=0x4819e30) at ../../../threadweaver/Weaver/Thread.cpp:87
#7  0x00007f971f31dd5b in ThreadWeaver::Thread::run (this=0x4819e30) at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007f9723521d05 in QThreadPrivate::start (arg=0x4819e30) at thread/qthread_unix.cpp:331
#9  0x00007f9717ce656c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007f971b4d9efc in start_thread (arg=0x7f96f0ad6700) at pthread_create.c:304
#11 0x00007f972644e89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f9726b5d7c0 (LWP 2001)):
[KCrash Handler]
#6  isNull (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x5b92880) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f970b43b112 in WindowTaskItem::publishIconGeometry (this=0x2c8d5c0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f970b449b7c in AbstractTaskItem::timerEvent (this=0x2c8d5c0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f972361f789 in QObject::event (this=0x2c8d5c0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f9722fd789b in QGraphicsWidget::event (this=0x2c8d5c0, event=0x7fff457f20d0) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f97229b9424 in notify_helper (e=0x7fff457f20d0, receiver=0x2c8d5c0, this=0x1c35100) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x1c35100, receiver=0x2c8d5c0, e=0x7fff457f20d0) at kernel/qapplication.cpp:4458
#15 0x00007f97229be291 in QApplication::notify (this=0x1c1c7c0, receiver=0x2c8d5c0, e=0x7fff457f20d0) at kernel/qapplication.cpp:4365
#16 0x00007f97242b7126 in KApplication::notify (this=0x1c1c7c0, receiver=0x2c8d5c0, event=0x7fff457f20d0) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f9723608afc in QCoreApplication::notifyInternal (this=0x1c1c7c0, receiver=0x2c8d5c0, event=0x7fff457f20d0) at kernel/qcoreapplication.cpp:787
#18 0x00007f9723635d62 in sendEvent (event=0x7fff457f20d0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x1c48a70) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f9723633538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f971a9cca5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f971a9cd258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f971a9cd429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f9723633ed6 in QEventDispatcherGlib::processEvents (this=0x1b7ff40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f9722a6107e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f9723607cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f9723607ef7 in QEventLoop::exec (this=0x7fff457f2360, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f972360c789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f972674d1a3 in kdemain (argc=1, argv=0x7fff457f2748) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f972638e30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff457f2748, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff457f2738) at libc-start.c:226
#32 0x0000000000400671 in _start ()

This bug may be a duplicate of or related to bug 288954.

Possible duplicates by query: bug 292259, bug 292254, bug 292253, bug 292242, bug 292220.

Reported using DrKonqi