Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.2 (4.7.2)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-14-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
About 9 times out of 10 when I shutdown the computer it crashes then eventually continues to shutdown. I am using 64 bit on lenovo e420 laptop. On my other lenovo laptop r61, with 32 bit I did not have this many crashes. Adding network printer crashes system settings too.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f4d878657a0 (LWP 1701))]

Thread 12 (Thread 0x7f4d67315700 (LWP 1702)):
#0  0x00007f4d7c1e0034 in __pthread_mutex_lock (mutex=0x2891598) at pthread_mutex_lock.c:61
#1  0x00007f4d7b6cfe5d in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f4d7b6d0dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4d7b6d1429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f4d84337f3e in QEventDispatcherGlib::processEvents (this=0x2891480, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f4d8430bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f4d8430bef7 in QEventLoop::exec (this=0x7f4d67314db0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f4d8422327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f4d842eecbf in QInotifyFileSystemWatcherEngine::run (this=0x288f710) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x288f710) at thread/qthread_unix.cpp:331
#10 0x00007f4d7c1ddefc in start_thread (arg=0x7f4d67315700) at pthread_create.c:304
#11 0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 11 (Thread 0x7f4d5a52e700 (LWP 1710)):
#0  0x00007f4d87145773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f4d7b6d0f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f4d7b6d1792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4d5b00c516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f4d7b6f62b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d5a52e700) at pthread_create.c:304
#6  0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 10 (Thread 0x7f4d58116700 (LWP 1716)):
#0  0x00007f4d7c1e11fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x2f301b8) at pthread_mutex_unlock.c:290
#2  0x00007f4d7b6d0d79 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4d7b6d1429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f4d84337f3e in QEventDispatcherGlib::processEvents (this=0x28eac60, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f4d8430bcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f4d8430bef7 in QEventLoop::exec (this=0x7f4d58115db0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f4d8422327f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f4d842eecbf in QInotifyFileSystemWatcherEngine::run (this=0x2ef59c0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x2ef59c0) at thread/qthread_unix.cpp:331
#10 0x00007f4d7c1ddefc in start_thread (arg=0x7f4d58116700) at pthread_create.c:304
#11 0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 9 (Thread 0x7f4d57468700 (LWP 3428)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x3b810f0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x3b810f0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80022e24 in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x3b810f0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d57467e00, parent=0x29308d0, th=0x3b810f0) at ../../../threadweaver/Weaver/Thread.cpp:87
#7  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x3b810f0) at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x3b810f0) at thread/qthread_unix.cpp:331
#9  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d57468700) at pthread_create.c:304
#10 0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 8 (Thread 0x7f4d5cd5e700 (LWP 3429)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x2e230e0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x2e230e0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80022e24 in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x2e230e0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d5cd5de00, parent=0x29308d0, th=0x2e230e0) at ../../../threadweaver/Weaver/Thread.cpp:87
#7  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x2e230e0) at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x2e230e0) at thread/qthread_unix.cpp:331
#9  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d5cd5e700) at pthread_create.c:304
#10 0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 7 (Thread 0x7f4d5ad2f700 (LWP 3430)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x7f4d6002c6a0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x7f4d6002c6a0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80022e24 in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x7f4d6002c6a0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:74
#6  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d5ad2ee00, parent=0x29308d0, th=0x7f4d6002c6a0) at ../../../threadweaver/Weaver/Thread.cpp:87
#7  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x7f4d6002c6a0) at ../../../threadweaver/Weaver/Thread.cpp:142
#8  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x7f4d6002c6a0) at thread/qthread_unix.cpp:331
#9  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d5ad2f700) at pthread_create.c:304
#10 0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f4d4ffff700 (LWP 3431)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x419b6b0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x419b6b0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d4fffee00, parent=0x29308d0, th=0x419b6b0) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x419b6b0) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x419b6b0) at thread/qthread_unix.cpp:331
#8  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d4ffff700) at pthread_create.c:304
#9  0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f4d4f7fe700 (LWP 3432)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x3b871a0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x3b871a0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d4f7fde00, parent=0x29308d0, th=0x3b871a0) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x3b871a0) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x3b871a0) at thread/qthread_unix.cpp:331
#8  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d4f7fe700) at pthread_create.c:304
#9  0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f4d4effd700 (LWP 5244)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x399f630) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x399f630) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d4effce00, parent=0x29308d0, th=0x399f630) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x399f630) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x399f630) at thread/qthread_unix.cpp:331
#8  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d4effd700) at pthread_create.c:304
#9  0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f4d4e7fc700 (LWP 5245)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x36196b0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x36196b0) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d4e7fbe00, parent=0x29308d0, th=0x36196b0) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x36196b0) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x36196b0) at thread/qthread_unix.cpp:331
#8  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d4e7fc700) at pthread_create.c:304
#9  0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f4d4dffb700 (LWP 5246)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f4d842261ab in wait (time=18446744073709551615, this=0x28b2c00) at thread/qwaitcondition_unix.cpp:88
#2  QWaitCondition::wait (this=<optimized out>, mutex=0x28cca20, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:160
#3  0x00007f4d80020864 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x29308d0, th=0x3f0ef90) at ../../../threadweaver/Weaver/WeaverImpl.cpp:365
#4  0x00007f4d80022e0b in ThreadWeaver::WorkingHardState::applyForWork (this=0x28d2990, th=0x3f0ef90) at ../../../threadweaver/Weaver/WorkingHardState.cpp:71
#5  0x00007f4d80021ccf in ThreadWeaver::ThreadRunHelper::run (this=0x7f4d4dffae00, parent=0x29308d0, th=0x3f0ef90) at ../../../threadweaver/Weaver/Thread.cpp:87
#6  0x00007f4d80021d5b in ThreadWeaver::Thread::run (this=0x3f0ef90) at ../../../threadweaver/Weaver/Thread.cpp:142
#7  0x00007f4d84225d05 in QThreadPrivate::start (arg=0x3f0ef90) at thread/qthread_unix.cpp:331
#8  0x00007f4d7c1ddefc in start_thread (arg=0x7f4d4dffb700) at pthread_create.c:304
#9  0x00007f4d8715189d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f4d878657a0 (LWP 1701)):
[KCrash Handler]
#6  0x00007f4d84177790 in vtable for QGraphicsLayoutItem () from /usr/lib/x86_64-linux-gnu/libQtGui.so.4
#7  0x00007f4d6db02b96 in TaskGroupItem::~TaskGroupItem (this=0x3fa0710, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:82
#8  0x00007f4d6db02c49 in TaskGroupItem::~TaskGroupItem (this=0x3fa0710, __in_chrg=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/taskgroupitem.cpp:83
#9  0x00007f4d84323a88 in QObject::event (this=0x3fa0710, e=<optimized out>) at kernel/qobject.cpp:1200
#10 0x00007f4d83cdb89b in QGraphicsWidget::event (this=0x3fa0710, event=0x33d5a90) at graphicsview/qgraphicswidget.cpp:1455
#11 0x00007f4d836bd424 in notify_helper (e=0x33d5a90, receiver=0x3fa0710, this=0x1f99130) at kernel/qapplication.cpp:4486
#12 QApplicationPrivate::notify_helper (this=0x1f99130, receiver=0x3fa0710, e=0x33d5a90) at kernel/qapplication.cpp:4458
#13 0x00007f4d836c2291 in QApplication::notify (this=0x1f86280, receiver=0x3fa0710, e=0x33d5a90) at kernel/qapplication.cpp:4365
#14 0x00007f4d84fbb126 in KApplication::notify (this=0x1f86280, receiver=0x3fa0710, event=0x33d5a90) at ../../kdeui/kernel/kapplication.cpp:311
#15 0x00007f4d8430cafc in QCoreApplication::notifyInternal (this=0x1f86280, receiver=0x3fa0710, event=0x33d5a90) at kernel/qcoreapplication.cpp:787
#16 0x00007f4d8431051f in sendEvent (event=0x33d5a90, receiver=0x3fa0710) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#17 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0x1f27430) at kernel/qcoreapplication.cpp:1428
#18 0x00007f4d843107c4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1071
#19 0x00007f4d874501a3 in kdemain (argc=1, argv=0x7fff5289f2f8) at ../../../../plasma/desktop/shell/main.cpp:120
#20 0x00007f4d8709130d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff5289f2f8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff5289f2e8) at libc-start.c:226
#21 0x0000000000400671 in _start ()

This bug may be a duplicate of or related to bug 285045.

Possible duplicates by query: bug 288715, bug 288129, bug 287962, bug 287333, bug 287205.

Reported using DrKonqi