Bug 287489

Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-13-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- Unusual behavior I noticed:
sometimes taskbar stops responding (can't switch active window)
plasma sometimes stops responding for a time, "freezes temporarily" ...
A workaround -- switching to console and back to X unfreezes plasma
desktop but sometimes leads to crash ...

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f56dfaec7a0 (LWP 2120))]

Thread 4 (Thread 0x7f56c2c6e700 (LWP 2122)):
#0  0x00007f56df3df773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f56d3969f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f56d396a792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f56c374c516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f56d398f2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f56d4476efc in start_thread (arg=0x7f56c2c6e700) at pthread_create.c:304
#6  0x00007f56df3eb89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f56b3b51700 (LWP 2123)):
#0  0x00007f56d4479034 in __pthread_mutex_lock (mutex=0x7f56bc120c58) at pthread_mutex_lock.c:61
#1  0x00007f56d3969023 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f56d3969dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f56d396a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f56dc5d0f3e in QEventDispatcherGlib::processEvents (this=0x7f56bc11ffb0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#5  0x00007f56dc5a4cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007f56dc5a4ef7 in QEventLoop::exec (this=0x7f56b3b50db0, flags=...) at kernel/qeventloop.cpp:201
#7  0x00007f56dc4bc27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#8  0x00007f56dc587cbf in QInotifyFileSystemWatcherEngine::run (this=0x2c890a0) at io/qfilesystemwatcher_inotify.cpp:248
#9  0x00007f56dc4bed05 in QThreadPrivate::start (arg=0x2c890a0) at thread/qthread_unix.cpp:331
#10 0x00007f56d4476efc in start_thread (arg=0x7f56b3b51700) at pthread_create.c:304
#11 0x00007f56df3eb89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f56ac0a4700 (LWP 2155)):
#0  0x00007f56d3968fd8 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f56d3969dfd in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f56d396a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f56dc5d0f3e in QEventDispatcherGlib::processEvents (this=0x41211e0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f56dc5a4cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f56dc5a4ef7 in QEventLoop::exec (this=0x7f56ac0a3de0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f56dc4bc27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f56dc4bed05 in QThreadPrivate::start (arg=0x28e11d0) at thread/qthread_unix.cpp:331
#8  0x00007f56d4476efc in start_thread (arg=0x7f56ac0a4700) at pthread_create.c:304
#9  0x00007f56df3eb89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f56dfaec7a0 (LWP 2120)):
[KCrash Handler]
#6  isNull (this=0x7400690054e160) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x7400690054e160) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x3d151c0) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007f56c4f40112 in WindowTaskItem::publishIconGeometry (this=0x435aa50) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007f56c4f4eb7c in AbstractTaskItem::timerEvent (this=0x435aa50, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007f56dc5bc789 in QObject::event (this=0x435aa50, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007f56dbf7489b in QGraphicsWidget::event (this=0x435aa50, event=0x7fffb322f650) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007f56db956424 in notify_helper (e=0x7fffb322f650, receiver=0x435aa50, this=0x2100bd0) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0x2100bd0, receiver=0x435aa50, e=0x7fffb322f650) at kernel/qapplication.cpp:4458
#15 0x00007f56db95b291 in QApplication::notify (this=0x20f4ca0, receiver=0x435aa50, e=0x7fffb322f650) at kernel/qapplication.cpp:4365
#16 0x00007f56dd254126 in KApplication::notify (this=0x20f4ca0, receiver=0x435aa50, event=0x7fffb322f650) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007f56dc5a5afc in QCoreApplication::notifyInternal (this=0x20f4ca0, receiver=0x435aa50, event=0x7fffb322f650) at kernel/qcoreapplication.cpp:787
#18 0x00007f56dc5d2d62 in sendEvent (event=0x7fffb322f650, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0x210a290) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007f56dc5d0538 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 idleTimerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#22 0x00007f56d3969a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007f56d396a258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007f56d396a429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007f56dc5d0ed6 in QEventDispatcherGlib::processEvents (this=0x2059f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#26 0x00007f56db9fe07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#27 0x00007f56dc5a4cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#28 0x00007f56dc5a4ef7 in QEventLoop::exec (this=0x7fffb322f8e0, flags=...) at kernel/qeventloop.cpp:201
#29 0x00007f56dc5a9789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#30 0x00007f56df6ea1a3 in kdemain (argc=1, argv=0x7fffb322fcc8) at ../../../../plasma/desktop/shell/main.cpp:120
#31 0x00007f56df32b30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffb322fcc8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffb322fcb8) at libc-start.c:226
#32 0x0000000000400671 in _start ()

Possible duplicates by query: bug 287460, bug 287277, bug 287181, bug 287120, bug 287064.

Reported using DrKonqi