Application: plasma-desktop (0.4)
KDE Platform Version: 4.8.90 (4.8.90)
Qt Version: 4.8.2
Operating System: Linux 3.4.4-1-ARCH x86_64
Distribution (Platform): Archlinux Packages

-- Information about the crash:
- What I was doing when the application crashed:
Just loging in the workspace makes plasma crash. 
- Unusual behavior I noticed:
Prior to first problematic login, plasma had trouble redrawing plasmoids and panel (suppressed clock and moved cashew on screensaver would still show, activity panel and plasmoids panel would superimpose etc...)
- Custom settings of the application:
Played a bit with grid desktop and tabbed containments.
Using a latest Qtcurve windec compiled from sources patched (http://codepad.org/qx6qdGNa) to alleviate a bug (i.e.: Kwin not launching. It worked perfectly for the last stable session so not sure it is related...)

The crash can be reproduced every time.

-- Backtrace:
Application: Outil de gestion de fenêtres Plasma (kdeinit4), signal: Segmentation fault
Using host libthread_db library "/lib/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd46d082780 (LWP 1195))]

Thread 5 (Thread 0x7fd44a503700 (LWP 1217)):
#0  0x00007fd46b9588f4 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fd4603b4ae7 in ?? () from /usr/lib/libQtScript.so.4
#2  0x00007fd4603b4b19 in ?? () from /usr/lib/libQtScript.so.4
#3  0x00007fd46b954e0e in start_thread () from /lib/libpthread.so.0
#4  0x00007fd46a6e91ed in clone () from /lib/libc.so.6

Thread 4 (Thread 0x7fd44645c700 (LWP 1253)):
#0  0x00007fff152d68bf in clock_gettime ()
#1  0x00007fd4678aef6d in clock_gettime () from /lib/librt.so.1
#2  0x00007fd46bc3a344 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fd46bd0d30d in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fd46bd0d653 in ?? () from /usr/lib/libQtCore.so.4
#5  0x00007fd46bd0c1cc in ?? () from /usr/lib/libQtCore.so.4
#6  0x00007fd46bd0c275 in ?? () from /usr/lib/libQtCore.so.4
#7  0x00007fd4675fdfaf in g_main_context_prepare () from /usr/lib/libglib-2.0.so.0
#8  0x00007fd4675fe69b in ?? () from /usr/lib/libglib-2.0.so.0
#9  0x00007fd4675fe894 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#10 0x00007fd46bd0cb06 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#11 0x00007fd46bcdd63f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#12 0x00007fd46bcdd8c8 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#13 0x00007fd46bbe16e0 in QThread::exec() () from /usr/lib/libQtCore.so.4
#14 0x00007fd46bcbe03f in ?? () from /usr/lib/libQtCore.so.4
#15 0x00007fd46bbe467b in ?? () from /usr/lib/libQtCore.so.4
#16 0x00007fd46b954e0e in start_thread () from /lib/libpthread.so.0
#17 0x00007fd46a6e91ed in clone () from /lib/libc.so.6

Thread 3 (Thread 0x7fd444dbf700 (LWP 1262)):
#0  0x00007fd46b9588f4 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fd461ab537d in ?? () from /usr/lib/libQtWebKit.so.4
#2  0x00007fd461ab5489 in ?? () from /usr/lib/libQtWebKit.so.4
#3  0x00007fd46b954e0e in start_thread () from /lib/libpthread.so.0
#4  0x00007fd46a6e91ed in clone () from /lib/libc.so.6

Thread 2 (Thread 0x7fd437fff700 (LWP 1263)):
#0  0x00007fff152d68bf in clock_gettime ()
#1  0x00007fd4678aef6d in clock_gettime () from /lib/librt.so.1
#2  0x00007fd46bc3a344 in ?? () from /usr/lib/libQtCore.so.4
#3  0x00007fd46bd0d30d in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fd46bd0c555 in ?? () from /usr/lib/libQtCore.so.4
#5  0x00007fd4675fe28b in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#6  0x00007fd4675fe712 in ?? () from /usr/lib/libglib-2.0.so.0
#7  0x00007fd4675fe894 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#8  0x00007fd46bd0cb06 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#9  0x00007fd46bcdd63f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#10 0x00007fd46bcdd8c8 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#11 0x00007fd46bbe16e0 in QThread::exec() () from /usr/lib/libQtCore.so.4
#12 0x00007fd46bbe467b in ?? () from /usr/lib/libQtCore.so.4
#13 0x00007fd46b954e0e in start_thread () from /lib/libpthread.so.0
#14 0x00007fd46a6e91ed in clone () from /lib/libc.so.6

Thread 1 (Thread 0x7fd46d082780 (LWP 1195)):
[KCrash Handler]
#5  0x00007fd46bc25e71 in ?? () from /usr/lib/libQtCore.so.4
#6  0x00007fd46ae992f2 in QKeySequence::mnemonic(QString const&) () from /usr/lib/libQtGui.so.4
#7  0x00007fd46b2d1148 in QTabBar::insertTab(int, QIcon const&, QString const&) () from /usr/lib/libQtGui.so.4
#8  0x00007fd4626cdce6 in Plasma::TabBar::insertTab(int, QIcon const&, QString const&, QGraphicsLayoutItem*) () from /usr/lib/libplasma.so.3
#9  0x00007fd4626cde9e in Plasma::TabBar::insertTab(int, QString const&, QGraphicsLayoutItem*) () from /usr/lib/libplasma.so.3
#10 0x00007fd4511ea958 in ?? () from /usr/lib/libplasma_groupingcontainment.so.4
#11 0x00007fd4511cd4c9 in AbstractGroup::restoreChildren() () from /usr/lib/libplasma_groupingcontainment.so.4
#12 0x00007fd4511ea80d in ?? () from /usr/lib/libplasma_groupingcontainment.so.4
#13 0x00007fd4511cb914 in ?? () from /usr/lib/libplasma_groupingcontainment.so.4
#14 0x00007fd4511d6b16 in ?? () from /usr/lib/libplasma_groupingcontainment.so.4
#15 0x00007fd46bcf32ae in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#16 0x00007fd46b4882eb in QGraphicsWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#17 0x00007fd46ae73f7c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#18 0x00007fd46ae783fa in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#19 0x00007fd46ca80c86 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#20 0x00007fd46bcde8ee in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#21 0x00007fd46bce2251 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#22 0x00007fd46bd0c953 in ?? () from /usr/lib/libQtCore.so.4
#23 0x00007fd4675fe4a5 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#24 0x00007fd4675fe7d8 in ?? () from /usr/lib/libglib-2.0.so.0
#25 0x00007fd4675fe894 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#26 0x00007fd46bd0cae6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#27 0x00007fd46af142fe in ?? () from /usr/lib/libQtGui.so.4
#28 0x00007fd46bcdd63f in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#29 0x00007fd46bcdd8c8 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#30 0x00007fd46bce2568 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#31 0x00007fd459ab6f85 in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#32 0x0000000000408292 in _start ()

Possible duplicates by query: bug 282251.

Reported using DrKonqi