Bug 358656

Application: plasma-desktop (4.12.2)
KDE Platform Version: 4.14.2
Qt Version: 4.8.2
Operating System: Linux 3.2.0-95-generic-pae i686
Distribution: Ubuntu 12.04.5 LTS

-- Information about the crash:
- What I was doing when the application crashed:
Changed activity, klicking on the activity manager icon (red-blue-green dots), while 6 okular windows were open and mirrored separately in the task manager panel, with "lock widgets" off. After the crash, only one okular icon appeared in the task manager panel, but with a small triangle to indicate that the the 6 open files could be seen in a tool tip-type list when the mouse hovers over the icon.

The crash can be reproduced sometimes.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xb1c4b740 (LWP 2347))]

Thread 4 (Thread 0xa3f17b40 (LWP 2355)):
#0  0xb7729428 in __kernel_vsyscall ()
#1  0xb288796b in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/i386-linux-gnu/libpthread.so.0
#2  0xb75e349c in pthread_cond_wait () from /lib/i386-linux-gnu/libc.so.6
#3  0xb37e0029 in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#4  0xb37e006f in ?? () from /usr/lib/i386-linux-gnu/libQtScript.so.4
#5  0xb2883d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#6  0xb75d5b8e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 3 (Thread 0xa2027b40 (LWP 2360)):
#0  0xb7729428 in __kernel_vsyscall ()
#1  0xb75c7440 in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2788a3b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb277b06e in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb277b1c1 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb5fb2de7 in QEventDispatcherGlib::processEvents (this=0xa1700468, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0xb5f7e6ad in QEventLoop::processEvents (this=0xa2027240, flags=...) at kernel/qeventloop.cpp:149
#7  0xb5f7e949 in QEventLoop::exec (this=0xa2027240, flags=...) at kernel/qeventloop.cpp:204
#8  0xb5e67a1c in QThread::exec (this=0xa61fee8) at thread/qthread.cpp:501
#9  0xb5f5bcfd in QInotifyFileSystemWatcherEngine::run (this=0xa61fee8) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb5e6aeb0 in QThreadPrivate::start (arg=0xa61fee8) at thread/qthread_unix.cpp:307
#11 0xb2883d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb75d5b8e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 2 (Thread 0x9fdaab40 (LWP 2363)):
#0  0xb7729428 in __kernel_vsyscall ()
#1  0xb75c7440 in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0xb2788a3b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb277b06e in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb277b1c1 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb5fb2de7 in QEventDispatcherGlib::processEvents (this=0x9f400468, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0xb5f7e6ad in QEventLoop::processEvents (this=0x9fdaa240, flags=...) at kernel/qeventloop.cpp:149
#7  0xb5f7e949 in QEventLoop::exec (this=0x9fdaa240, flags=...) at kernel/qeventloop.cpp:204
#8  0xb5e67a1c in QThread::exec (this=0xa736f48) at thread/qthread.cpp:501
#9  0xb5f5bcfd in QInotifyFileSystemWatcherEngine::run (this=0xa736f48) at io/qfilesystemwatcher_inotify.cpp:248
#10 0xb5e6aeb0 in QThreadPrivate::start (arg=0xa736f48) at thread/qthread_unix.cpp:307
#11 0xb2883d4c in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#12 0xb75d5b8e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb1c4b740 (LWP 2347)):
[KCrash Handler]
#7  0xb6b6507e in QDeclarativeItem::~QDeclarativeItem (this=0xc6370d0, __in_chrg=<optimized out>) at graphicsitems/qdeclarativeitem.cpp:1668
#8  0xa3169980 in ?? () from /usr/lib/kde4/imports/org/kde/plasma/core/libcorebindingsplugin.so
#9  0xa3155db0 in ?? () from /usr/lib/kde4/imports/org/kde/plasma/core/libcorebindingsplugin.so
#10 0xb5f94203 in qDeleteInEventHandler (o=0xc6370d0) at kernel/qobject.cpp:4277
#11 0xb5f9b1a8 in QObject::event (this=0xc6370d0, e=0xa4473c0) at kernel/qobject.cpp:1176
#12 0xb6b5eae2 in QDeclarativeItem::event (this=0xc6370d0, ev=0xa4473c0) at graphicsitems/qdeclarativeitem.cpp:3746
#13 0xb5469df4 in notify_helper (e=0xa4473c0, receiver=0xc6370d0, this=0x99c23f0) at kernel/qapplication.cpp:4556
#14 QApplicationPrivate::notify_helper (this=0x99c23f0, receiver=0xc6370d0, e=0xa4473c0) at kernel/qapplication.cpp:4528
#15 0xb546f15d in QApplication::notify (this=0xa4473c0, receiver=0xc6370d0, e=0xa4473c0) at kernel/qapplication.cpp:4285
#16 0xb66243b1 in KApplication::notify (this=0x99a6d60, receiver=0xc6370d0, event=0xa4473c0) at ../../kdeui/kernel/kapplication.cpp:311
#17 0xb5f7fe0e in QCoreApplication::notifyInternal (this=0x99a6d60, receiver=0xc6370d0, event=0xa4473c0) at kernel/qcoreapplication.cpp:915
#18 0xb5f83f68 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9974a88) at kernel/qcoreapplication.cpp:1539
#20 0xb5f8429c in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1432
#21 0xb5fb2994 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#22 postEventSourceDispatch (s=0x99c84b0) at kernel/qeventdispatcher_glib.cpp:279
#23 0xb277ad46 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#24 0xb277b0e5 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#25 0xb277b1c1 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#26 0xb5fb2d87 in QEventDispatcherGlib::processEvents (this=0x9975818, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#27 0xb5522a1a in QGuiEventDispatcherGlib::processEvents (this=0x9975818, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#28 0xb5f7e6ad in QEventLoop::processEvents (this=0xbf94ed14, flags=...) at kernel/qeventloop.cpp:149
#29 0xb5f7e949 in QEventLoop::exec (this=0xbf94ed14, flags=...) at kernel/qeventloop.cpp:204
#30 0xb5f8434a in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1187
#31 0xb54679c4 in QApplication::exec () at kernel/qapplication.cpp:3817
#32 0xb76e22e9 in kdemain () from /usr/lib/kde4/libkdeinit/libkdeinit4_plasma-desktop.so
#33 0x0804850b in ?? ()
#34 0xb75004d3 in __libc_start_main () from /lib/i386-linux-gnu/libc.so.6
#35 0x08048531 in _start ()

Reported using DrKonqi