Bug 313952

Application: plasma-desktop (0.4)
KDE Platform Version: 4.9.4
Qt Version: 4.8.3
Operating System: Linux 3.5.0-22-generic x86_64
Distribution: Ubuntu 12.10

-- Information about the crash:
- What I was doing when the application crashed:

I was removing a second panel from my desktop. The only widget on the panel was the "System Tray" widget (my other widgets had all been on my primary panel).

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff464882780 (LWP 9307))]

Thread 7 (Thread 0x7ff447fff700 (LWP 9324)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007ff471912cd7 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007ff471912d09 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007ff46bfabe9a in start_thread (arg=0x7ff447fff700) at pthread_create.c:308
#4  0x00007ff477c18cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7ff439a31700 (LWP 9344)):
#0  0x00007ff46bfaf05d in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x7ff434000a60) at pthread_mutex_unlock.c:290
#2  0x00007ff46b8e9e51 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff46b8acc5c in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff46b8acea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ff4748bbc16 in QEventDispatcherGlib::processEvents (this=0x7ff4340008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007ff47488c2bf in QEventLoop::processEvents (this=this@entry=0x7ff439a30dc0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007ff47488c548 in QEventLoop::exec (this=0x7ff439a30dc0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007ff47478db10 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007ff47486e478 in QDnotifySignalThread::run (this=0x32a9220) at io/qfilesystemwatcher_dnotify.cpp:179
#10 0x00007ff474790aec in QThreadPrivate::start (arg=0x32a9220) at thread/qthread_unix.cpp:338
#11 0x00007ff46bfabe9a in start_thread (arg=0x7ff439a31700) at pthread_create.c:308
#12 0x00007ff477c18cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7ff438eed700 (LWP 9349)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007ff472d80b2d in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007ff472d80c39 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007ff46bfabe9a in start_thread (arg=0x7ff438eed700) at pthread_create.c:308
#4  0x00007ff477c18cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7ff433fff700 (LWP 9350)):
#0  0x00007ff46bfaf05d in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x7ff42c000a60) at pthread_mutex_unlock.c:290
#2  0x00007ff46b8e9e51 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff46b8acd79 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007ff46b8acea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007ff4748bbc16 in QEventDispatcherGlib::processEvents (this=0x7ff42c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007ff47488c2bf in QEventLoop::processEvents (this=this@entry=0x7ff433ffee00, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007ff47488c548 in QEventLoop::exec (this=0x7ff433ffee00, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007ff47478db10 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007ff474790aec in QThreadPrivate::start (arg=0x32d9ba0) at thread/qthread_unix.cpp:338
#10 0x00007ff46bfabe9a in start_thread (arg=0x7ff433fff700) at pthread_create.c:308
#11 0x00007ff477c18cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7ff3ebfff700 (LWP 9357)):
#0  0x00007ff46b8ac72f in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007ff46b8accf9 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff46b8acea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff4748bbc16 in QEventDispatcherGlib::processEvents (this=0x7ff3e00008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007ff47488c2bf in QEventLoop::processEvents (this=this@entry=0x7ff3ebffee00, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007ff47488c548 in QEventLoop::exec (this=0x7ff3ebffee00, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007ff47478db10 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007ff474790aec in QThreadPrivate::start (arg=0x3329d90) at thread/qthread_unix.cpp:338
#8  0x00007ff46bfabe9a in start_thread (arg=0x7ff3ebfff700) at pthread_create.c:308
#9  0x00007ff477c18cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7ff3d1961700 (LWP 9418)):
#0  0x00007ff477c0d303 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007ff46b8acd84 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007ff46b8acea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007ff4748bbc16 in QEventDispatcherGlib::processEvents (this=0x7ff3cc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007ff47488c2bf in QEventLoop::processEvents (this=this@entry=0x7ff3d1960e00, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007ff47488c548 in QEventLoop::exec (this=0x7ff3d1960e00, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007ff47478db10 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007ff474790aec in QThreadPrivate::start (arg=0x25dbdc0) at thread/qthread_unix.cpp:338
#8  0x00007ff46bfabe9a in start_thread (arg=0x7ff3d1961700) at pthread_create.c:308
#9  0x00007ff477c18cbd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7ff464882780 (LWP 9307)):
[KCrash Handler]
#6  0x0000000000000040 in ?? ()
#7  0x00007ff4748a6bda in QObject::connect (sender=0x7908c80, signal=0x7ff4505b9a29 "2destroyed()", receiver=0x3cb8930, method=0x7ff4505b9a18 "1widgetDeleted()", type=Qt::AutoConnection) at kernel/qobject.cpp:2551
#8  0x00007ff45059c908 in SystemTray::Task::widget (this=0x3cb8930, host=0x854f180, createIfNecessary=<optimized out>) at ../../../../../plasma/generic/applets/systemtray/core/task.cpp:83
#9  0x00007ff4505b6556 in SystemTray::TaskArea::addWidgetForTask (this=this@entry=0x8cf30c0, task=0x3cb8930) at ../../../../../plasma/generic/applets/systemtray/ui/taskarea.cpp:270
#10 0x00007ff4505b6c46 in SystemTray::TaskArea::addTask (this=0x8cf30c0, task=<optimized out>) at ../../../../../plasma/generic/applets/systemtray/ui/taskarea.cpp:196
#11 0x00007ff4748a2f5f in QMetaObject::activate (sender=0x25fa060, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff16ba6d00) at kernel/qobject.cpp:3547
#12 0x00007ff45059ba62 in SystemTray::Manager::taskChanged (this=<optimized out>, _t1=0x3cb8930) at ./manager.moc:120
#13 0x00007ff4748a2f5f in QMetaObject::activate (sender=0x3cb8930, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff16ba6e50) at kernel/qobject.cpp:3547
#14 0x00007ff45059c65f in SystemTray::Task::changed (this=<optimized out>, _t1=0x3cb8930) at ./task.moc:128
#15 0x00007ff4748a243e in QObject::event (this=0x3cb8930, e=<optimized out>) at kernel/qobject.cpp:1195
#16 0x00007ff473c34e9c in QApplicationPrivate::notify_helper (this=this@entry=0x1c59a00, receiver=receiver@entry=0x3cb8930, e=e@entry=0x78ffed0) at kernel/qapplication.cpp:4562
#17 0x00007ff473c3930a in QApplication::notify (this=0x1c3f5f0, receiver=0x3cb8930, e=0x78ffed0) at kernel/qapplication.cpp:4423
#18 0x00007ff4755461d6 in KApplication::notify (this=0x1c3f5f0, receiver=0x3cb8930, event=0x78ffed0) at ../../kdeui/kernel/kapplication.cpp:311
#19 0x00007ff47488d56e in QCoreApplication::notifyInternal (this=0x1c3f5f0, receiver=receiver@entry=0x3cb8930, event=event@entry=0x78ffed0) at kernel/qcoreapplication.cpp:915
#20 0x00007ff4748913f1 in sendEvent (event=0x78ffed0, receiver=0x3cb8930) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#21 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1bda1f0) at kernel/qcoreapplication.cpp:1539
#22 0x00007ff4748bba63 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#23 postEventSourceDispatch (s=0x1c58760) at kernel/qeventdispatcher_glib.cpp:279
#24 0x00007ff46b8acab5 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007ff46b8acde8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007ff46b8acea4 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007ff4748bbbf6 in QEventDispatcherGlib::processEvents (this=0x1c58d50, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#28 0x00007ff473cd9c1e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#29 0x00007ff47488c2bf in QEventLoop::processEvents (this=this@entry=0x7fff16ba7750, flags=...) at kernel/qeventloop.cpp:149
#30 0x00007ff47488c548 in QEventLoop::exec (this=0x7fff16ba7750, flags=...) at kernel/qeventloop.cpp:204
#31 0x00007ff474891708 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#32 0x00007ff477f1f035 in kdemain (argc=1, argv=0x7fff16ba7a48) at ../../../../plasma/desktop/shell/main.cpp:120
#33 0x00007ff477b4676d in __libc_start_main (main=0x4006a0 <main(int, char**)>, argc=1, ubp_av=0x7fff16ba7a48, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff16ba7a38) at libc-start.c:226
#34 0x00000000004006d1 in _start ()

This bug may be a duplicate of or related to bug 290712.

Possible duplicates by query: bug 313400, bug 313045, bug 311163, bug 310838, bug 309177.

Reported using DrKonqi