Application: plasma-desktop (0.4)
KDE Platform Version: 4.8.1 (4.8.1)
Qt Version: 4.8.0
Operating System: Linux 3.2.0-18-generic x86_64
Distribution: Ubuntu precise (development branch)

-- Information about the crash:
- What I was doing when the application crashed:
It chashed right after login.
- Unusual behavior I noticed:
Just showed black screen with bug submission dialogue

The crash can be reproduced every time.

-- 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 0x7f967839a780 (LWP 1703))]

Thread 7 (Thread 0x7f964fc0e700 (LWP 1704)):
#0  0x00007f966be22747 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f966be2305b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f966be23264 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9674e41a76 in QEventDispatcherGlib::processEvents (this=0x7f96480008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007f9674e112d2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9674e11527 in QEventLoop::exec (this=0x7f964fc0ddd0, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f9674d10f97 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f9674df106f in QInotifyFileSystemWatcherEngine::run (this=0x2cb24c0) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f9674d13fbb in QThreadPrivate::start (arg=0x2cb24c0) at thread/qthread_unix.cpp:298
#9  0x00007f966c727e9a in start_thread (arg=0x7f964fc0e700) at pthread_create.c:308
#10 0x00007f9677c6e74d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 6 (Thread 0x7f964e634700 (LWP 1705)):
#0  0x00007f9677c6134d in read () at ../sysdeps/unix/syscall-template.S:82
#1  0x00007f966be5d74f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f966be22bfd in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f966be230d6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f966be23264 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f9674e41a76 in QEventDispatcherGlib::processEvents (this=0x7f96400008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007f9674e112d2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f9674e11527 in QEventLoop::exec (this=0x7f964e633dd0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007f9674d10f97 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#9  0x00007f9674df106f in QInotifyFileSystemWatcherEngine::run (this=0x2d39df0) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007f9674d13fbb in QThreadPrivate::start (arg=0x2d39df0) at thread/qthread_unix.cpp:298
#11 0x00007f966c727e9a in start_thread (arg=0x7f964e634700) at pthread_create.c:308
#12 0x00007f9677c6e74d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f9647304700 (LWP 1708)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f9671bf6212 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f9671bf6249 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f966c727e9a in start_thread (arg=0x7f9647304700) at pthread_create.c:308
#4  0x00007f9677c6e74d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f963bfff700 (LWP 1713)):
#0  0x00007f9677c62d93 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f966be23136 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f966be2359a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9644b4b5a6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f966be447f5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f966c727e9a in start_thread (arg=0x7f963bfff700) at pthread_create.c:308
#6  0x00007f9677c6e74d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f963adf8700 (LWP 1714)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f96732dddec in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#2  0x00007f96732ddf19 in ?? () from /usr/lib/x86_64-linux-gnu/libQtWebKit.so.4
#3  0x00007f966c727e9a in start_thread (arg=0x7f963adf8700) at pthread_create.c:308
#4  0x00007f9677c6e74d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f963a4f7700 (LWP 1715)):
#0  0x00007f9677c62d93 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f966be23136 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f966be23264 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f9674e41a76 in QEventDispatcherGlib::processEvents (this=0x7f96280008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007f9674e112d2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f9674e11527 in QEventLoop::exec (this=0x7f963a4f6e00, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007f9674d10f97 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#7  0x00007f9674d13fbb in QThreadPrivate::start (arg=0x258f840) at thread/qthread_unix.cpp:298
#8  0x00007f966c727e9a in start_thread (arg=0x7f963a4f7700) at pthread_create.c:308
#9  0x00007f9677c6e74d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#10 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f967839a780 (LWP 1703)):
[KCrash Handler]
#6  length (this=0x3c53d78) at ../../include/QtCore/../../src/corelib/tools/qstring.h:697
#7  QString::toUcs4 (this=0x3c53d78) at tools/qstring.cpp:3806
#8  0x00007f965a0b0b30 in qpycore_PyObject_FromQString(QString const&) () from /usr/lib/python2.7/dist-packages/PyQt4/QtCore.so
#9  0x00007f965ac6c537 in _PyObject_Str () from /usr/lib/libpython2.7.so.1.0
#10 0x00007f965ac6c62a in PyObject_Str () from /usr/lib/libpython2.7.so.1.0
#11 0x00007f965abff741 in string_new () from /usr/lib/libpython2.7.so.1.0
#12 0x00007f965acb8ec3 in type_call.25605 () from /usr/lib/libpython2.7.so.1.0
#13 0x00007f965acb7e83 in PyObject_Call () from /usr/lib/libpython2.7.so.1.0
#14 0x00007f965ac0746d in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0
#15 0x00007f965abd3605 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0
#16 0x00007f965abd37bd in function_call () from /usr/lib/libpython2.7.so.1.0
#17 0x00007f965acb7e83 in PyObject_Call () from /usr/lib/libpython2.7.so.1.0
#18 0x00007f965ac9c1cf in instancemethod_call.8746 () from /usr/lib/libpython2.7.so.1.0
#19 0x00007f965acb7e83 in PyObject_Call () from /usr/lib/libpython2.7.so.1.0
#20 0x00007f965acb87d7 in PyEval_CallObjectWithKeywords () from /usr/lib/libpython2.7.so.1.0
#21 0x00007f9659d24f80 in sip_api_invoke_slot (slot=<optimized out>, sigargs=) at /build/buildd/sip4-4.13.2/siplib/qtlib.c:203
#22 0x00007f965a0ac396 in PyQtProxy::invokeSlot(qpycore_slot const&, void**) () from /usr/lib/python2.7/dist-packages/PyQt4/QtCore.so
#23 0x00007f965a0ac690 in PyQtProxy::unislot(void**) () from /usr/lib/python2.7/dist-packages/PyQt4/QtCore.so
#24 0x00007f965a0ac772 in PyQtProxy::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/python2.7/dist-packages/PyQt4/QtCore.so
#25 0x00007f9674e26ad9 in QMetaObject::activate (sender=0x3910ff0, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff60166370) at kernel/qobject.cpp:3566
#26 0x00007f9675c07052 in KWallet::Wallet::walletOpened (this=<optimized out>, _t1=true) at ./kwallet.moc:167
#27 0x00007f9674e268d1 in QMetaObject::activate (sender=0x3090a00, m=<optimized out>, local_signal_index=<optimized out>, argv=0x7fff601664c0) at kernel/qobject.cpp:3547
#28 0x00007f9675c38b6f in OrgKdeKWalletInterface::walletAsyncOpened (this=<optimized out>, _t1=0, _t2=1498830808) at kwallet_interface.moc:324
#29 0x00007f9675c3b2d6 in OrgKdeKWalletInterface::qt_static_metacall (_o=0x3090a00, _id=<optimized out>, _a=0x7fff60166c20, _c=<optimized out>) at kwallet_interface.moc:162
#30 0x00007f9675c3b57b in OrgKdeKWalletInterface::qt_metacall (this=0x3090a00, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff60166c20) at kwallet_interface.moc:287
#31 0x00007f967518d37b in QDBusConnectionPrivate::deliverCall (this=0x1dfdd60, object=0x3090a00, msg=..., metaTypes=..., slotIdx=9) at qdbusintegrator.cpp:947
#32 0x00007f9674e2ba96 in QObject::event (this=0x3090a00, e=<optimized out>) at kernel/qobject.cpp:1195
#33 0x00007f96741956b4 in notify_helper (e=0x1f96a30, receiver=0x3090a00, this=0x1e1e7b0) at kernel/qapplication.cpp:4555
#34 QApplicationPrivate::notify_helper (this=0x1e1e7b0, receiver=0x3090a00, e=0x1f96a30) at kernel/qapplication.cpp:4527
#35 0x00007f967419a533 in QApplication::notify (this=0x1df23c0, receiver=0x3090a00, e=0x1f96a30) at kernel/qapplication.cpp:4416
#36 0x00007f9675aef906 in KApplication::notify (this=0x1df23c0, receiver=0x3090a00, event=0x1f96a30) at ../../kdeui/kernel/kapplication.cpp:311
#37 0x00007f9674e124ec in QCoreApplication::notifyInternal (this=0x1df23c0, receiver=0x3090a00, event=0x1f96a30) at kernel/qcoreapplication.cpp:876
#38 0x00007f9674e162ba in sendEvent (event=0x1f96a30, receiver=0x3090a00) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#39 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x1d941f0) at kernel/qcoreapplication.cpp:1500
#40 0x00007f9674e415e3 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#41 postEventSourceDispatch (s=<optimized out>) at kernel/qeventdispatcher_glib.cpp:279
#42 0x00007f966be22dda in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#43 0x00007f966be231a0 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#44 0x00007f966be23264 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#45 0x00007f9674e41a0f in QEventDispatcherGlib::processEvents (this=0x1d95ad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#46 0x00007f967423daae in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#47 0x00007f9674e112d2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#48 0x00007f9674e11527 in QEventLoop::exec (this=0x7fff601675b0, flags=...) at kernel/qeventloop.cpp:204
#49 0x00007f9674e165b7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#50 0x00007f9677f7aa13 in kdemain (argc=1, argv=0x7fff60167998) at ../../../../plasma/desktop/shell/main.cpp:120
#51 0x00007f9677b9f76d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fff60167998, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff60167988) at libc-start.c:226
#52 0x0000000000400671 in _start ()

Reported using DrKonqi