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:
When I shutdown the pc, plasma desktop crash every time and appear the error notification. When I choose to skip debug notification, the system shutdown without any problem.

The crash can be reproduced every time.

-- Backtrace:
Application: Shell del desktop di Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fecb13097a0 (LWP 1646))]

Thread 7 (Thread 0x7fec8ea7a700 (LWP 1647)):
#0  0x00007fecb0be6773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007feca5170f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007feca5171429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fecaddd7f3e in QEventDispatcherGlib::processEvents (this=0x1f637b0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fecaddabcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fecaddabef7 in QEventLoop::exec (this=0x7fec8ea79db0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fecadcc327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fecadd8ecbf in QInotifyFileSystemWatcherEngine::run (this=0x1f6d130) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fecadcc5d05 in QThreadPrivate::start (arg=0x1f6d130) at thread/qthread_unix.cpp:331
#9  0x00007feca5c7defc in start_thread (arg=0x7fec8ea7a700) at pthread_create.c:304
#10 0x00007fecb0bf289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7fec8cfb9700 (LWP 1648)):
#0  0x00007feca5170d30 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007feca5171429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fecaddd7f3e in QEventDispatcherGlib::processEvents (this=0x1a7f960, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#3  0x00007fecaddabcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#4  0x00007fecaddabef7 in QEventLoop::exec (this=0x7fec8cfb8db0, flags=...) at kernel/qeventloop.cpp:201
#5  0x00007fecadcc327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#6  0x00007fecadd8ecbf in QInotifyFileSystemWatcherEngine::run (this=0x1a971f0) at io/qfilesystemwatcher_inotify.cpp:248
#7  0x00007fecadcc5d05 in QThreadPrivate::start (arg=0x1a971f0) at thread/qthread_unix.cpp:331
#8  0x00007feca5c7defc in start_thread (arg=0x7fec8cfb9700) at pthread_create.c:304
#9  0x00007fecb0bf289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7fec831df700 (LWP 2035)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fecadcc61ab in wait (time=18446744073709551615, this=0x1f91630) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1f96a30, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007feca9ac0864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1fb4750, th=0x1e8eb20) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007feca9ac2e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1f8f810, th=0x1e8eb20) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007feca9ac1ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7fec831dee00, parent=0x1fb4750, th=0x1e8eb20) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007feca9ac1d5b in ThreadWeaver::Thread::run (this=0x1e8eb20) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007fecadcc5d05 in QThreadPrivate::start (arg=0x1e8eb20) at thread/qthread_unix.cpp:331
#8  0x00007feca5c7defc in start_thread (arg=0x7fec831df700) at pthread_create.c:304
#9  0x00007fecb0bf289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7fec848fe700 (LWP 2036)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fecadcc61ab in wait (time=18446744073709551615, this=0x1f91630) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1f96a30, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007feca9ac0864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1fb4750, th=0x7fec88003e90) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007feca9ac2e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1f8f810, th=0x7fec88003e90) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007feca9ac2e24 in ThreadWeaver::WorkingHardState::applyForWork (this=0x1f8f810, th=0x7fec88003e90) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007feca9ac1ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7fec848fde00, parent=0x1fb4750, th=0x7fec88003e90) at ../../../threadweaver/Weaver/Thread.cpp:87
#7  0x00007feca9ac1d5b in ThreadWeaver::Thread::run (this=0x7fec88003e90) at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007fecadcc5d05 in QThreadPrivate::start (arg=0x7fec88003e90) at thread/qthread_unix.cpp:331
#9  0x00007feca5c7defc in start_thread (arg=0x7fec848fe700) at pthread_create.c:304
#10 0x00007fecb0bf289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fec80e1f700 (LWP 2037)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fecadcc61ab in wait (time=18446744073709551615, this=0x1f91630) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1f96a30, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007feca9ac0864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1fb4750, th=0x2e83240) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007feca9ac2e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1f8f810, th=0x2e83240) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007feca9ac1ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7fec80e1ee00, parent=0x1fb4750, th=0x2e83240) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007feca9ac1d5b in ThreadWeaver::Thread::run (this=0x2e83240) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007fecadcc5d05 in QThreadPrivate::start (arg=0x2e83240) at thread/qthread_unix.cpp:331
#8  0x00007feca5c7defc in start_thread (arg=0x7fec80e1f700) at pthread_create.c:304
#9  0x00007fecb0bf289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fec8061e700 (LWP 2038)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007fecadcc61ab in wait (time=18446744073709551615, this=0x1f91630) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x1f96a30, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007feca9ac0864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x1fb4750, th=0x151f1a0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007feca9ac2e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x1f8f810, th=0x151f1a0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007feca9ac1ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7fec8061de00, parent=0x1fb4750, th=0x151f1a0) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007feca9ac1d5b in ThreadWeaver::Thread::run (this=0x151f1a0) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007fecadcc5d05 in QThreadPrivate::start (arg=0x151f1a0) at thread/qthread_unix.cpp:331
#8  0x00007feca5c7defc in start_thread (arg=0x7fec8061e700) at pthread_create.c:304
#9  0x00007fecb0bf289d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fecb13097a0 (LWP 1646)):
[KCrash Handler]
#6  0x00000000016fd648 in ?? ()
#7  0x00007fec97503b96 in TaskGroupItem::~TaskGroupItem (this=0x293ccf0, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#8  0x00007fec97503c59 in TaskGroupItem::~TaskGroupItem (this=0x293ccf0, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:84
#9  0x00007fecaddc3a88 in QObject::event (this=0x293ccf0, e=<optimized out>) at kernel/qobject.cpp:1200
#10 0x00007fecad77b89b in QGraphicsWidget::event (this=0x293ccf0, event=0x28e1610) at graphicsview/qgraphicswidget.cpp:1455
#11 0x00007fecad15d424 in notify_helper (e=0x28e1610, receiver=0x293ccf0, this=0x1572f00) at kernel/qapplication.cpp:4486
#12 QApplicationPrivate::notify_helper (this=0x1572f00, receiver=0x293ccf0, e=0x28e1610) at kernel/qapplication.cpp:4458
#13 0x00007fecad162291 in QApplication::notify (this=0x1563220, receiver=0x293ccf0, e=0x28e1610) at kernel/qapplication.cpp:4365
#14 0x00007fecaea5b126 in KApplication::notify (this=0x1563220, receiver=0x293ccf0, event=0x28e1610) at ../../kdeui/kernel/kapplication.cpp:311
#15 0x00007fecaddacafc in QCoreApplication::notifyInternal (this=0x1563220, receiver=0x293ccf0, event=0x28e1610) at kernel/qcoreapplication.cpp:787
#16 0x00007fecaddb051f in sendEvent (event=0x28e1610, receiver=0x293ccf0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0x14fa430) at kernel/qcoreapplication.cpp:1428
#18 0x00007fecaddb07c4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1071
#19 0x00007fecb0ef11a3 in kdemain (argc=1, argv=0x7fffbb0aac48) at ../../../../plasma/desktop/shell/main.cpp:120
#20 0x00007fecb0b3230d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffbb0aac48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffbb0aac38) at libc-start.c:226
#21 0x0000000000400671 in _start ()

Possible duplicates by query: bug 291155, bug 290942, bug 290911, bug 290667, bug 290290.

Reported using DrKonqi