Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.2 (4.7.2)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-12-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed: Since 2 weeks, when i start my kubuntu, a segmentation fault occurs. With the same distribution, computer, and configuration the bug didn't occur. Now it's permanent.

The crash can be reproduced every time.

-- Backtrace:
Application: Outil de gestion de fenêtres Plasma (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fa736e897a0 (LWP 2679))]

Thread 3 (Thread 0x7fa714bab700 (LWP 2681)):
#0  0x00007fa73675c773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fa72ace7f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fa72ace8429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa73394ef3e in QEventDispatcherGlib::processEvents (this=0x24fad60, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fa733922cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fa733922ef7 in QEventLoop::exec (this=0x7fa714baadb0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fa73383a27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fa733905cbf in QInotifyFileSystemWatcherEngine::run (this=0x24f7e90) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fa73383cd05 in QThreadPrivate::start (arg=0x24f7e90) at thread/qthread_unix.cpp:331
#9  0x00007fa72b7f4efc in start_thread (arg=0x7fa714bab700) at pthread_create.c:304
#10 0x00007fa73676889d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fa7120b4700 (LWP 2682)):
#0  0x00007fa72b7f81fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x27283a8) at pthread_mutex_unlock.c:290
#2  0x00007fa72ace7900 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fa72ace8258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fa72ace8429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fa73394ef3e in QEventDispatcherGlib::processEvents (this=0x27282b0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007fa733922cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fa733922ef7 in QEventLoop::exec (this=0x7fa7120b3db0, flags=...) at kernel/qeventloop.cpp:201
#8  0x00007fa73383a27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#9  0x00007fa733905cbf in QInotifyFileSystemWatcherEngine::run (this=0x27092e0) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007fa73383cd05 in QThreadPrivate::start (arg=0x27092e0) at thread/qthread_unix.cpp:331
#11 0x00007fa72b7f4efc in start_thread (arg=0x7fa7120b4700) at pthread_create.c:304
#12 0x00007fa73676889d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa736e897a0 (LWP 2679)):
[KCrash Handler]
#6  0x00007fa7332b5734 in QGraphicsLayoutItem::isLayout (this=0x332c680) at graphicsview/qgraphicslayoutitem.cpp:868
#7  0x00007fa7332b46e2 in QGraphicsLayoutPrivate::activateRecursive (this=0x1ee37d0, item=0x332c680) at graphicsview/qgraphicslayout_p.cpp:181
#8  0x00007fa7332b4724 in QGraphicsLayoutPrivate::activateRecursive (this=0x1ee37d0, item=0x1e96640) at graphicsview/qgraphicslayout_p.cpp:194
#9  0x00007fa7332b40db in QGraphicsLayout::activate (this=0x1e96640) at graphicsview/qgraphicslayout.cpp:261
#10 0x00007fa7332b4199 in QGraphicsLayout::widgetEvent (this=0x1e96640, e=<optimized out>) at graphicsview/qgraphicslayout.cpp:389
#11 0x00007fa7332f285a in QGraphicsWidget::event (this=<optimized out>, event=0x314fce0) at graphicsview/qgraphicswidget.cpp:1379
#12 0x00007fa732cd4424 in notify_helper (e=0x314fce0, receiver=0x1ed66f0, this=0x1c2acc0) at kernel/qapplication.cpp:4486
#13 QApplicationPrivate::notify_helper (this=0x1c2acc0, receiver=0x1ed66f0, e=0x314fce0) at kernel/qapplication.cpp:4458
#14 0x00007fa732cd9291 in QApplication::notify (this=0x1c16830, receiver=0x1ed66f0, e=0x314fce0) at kernel/qapplication.cpp:4365
#15 0x00007fa7345d2126 in KApplication::notify (this=0x1c16830, receiver=0x1ed66f0, event=0x314fce0) at ../../kdeui/kernel/kapplication.cpp:311
#16 0x00007fa733923afc in QCoreApplication::notifyInternal (this=0x1c16830, receiver=0x1ed66f0, event=0x314fce0) at kernel/qcoreapplication.cpp:787
#17 0x00007fa73392751f in sendEvent (event=0x314fce0, receiver=0x1ed66f0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#18 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1bb4430) at kernel/qcoreapplication.cpp:1428
#19 0x00007fa73394ea73 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#20 postEventSourceDispatch (s=<optimized out>) at kernel/qeventdispatcher_glib.cpp:277
#21 0x00007fa72ace7a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007fa72ace8258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fa72ace8429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fa73394eed6 in QEventDispatcherGlib::processEvents (this=0x1bb5f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#25 0x00007fa732d7c07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#26 0x00007fa733922cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#27 0x00007fa733922ef7 in QEventLoop::exec (this=0x7fff8276f830, flags=...) at kernel/qeventloop.cpp:201
#28 0x00007fa733927789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#29 0x00007fa736a671a3 in kdemain (argc=1, argv=0x7fff8276fc18) at ../../../../plasma/desktop/shell/main.cpp:120
#30 0x00007fa7366a830d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff8276fc18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff8276fc08) at libc-start.c:226
#31 0x0000000000400671 in _start ()

Possible duplicates by query: bug 285701, bug 285526, bug 285399, bug 285193, bug 284550.

Reported using DrKonqi