Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-15-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
duplicate of 213634
Added google calendar. When plasma accesses KDE Wallet, the whole stuff gets black. Restarts are not helping.
I just made a fresh installation, few additional applications to Kubuntu there.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fc72546a750 (LWP 2032))]

Thread 2 (Thread 0x7fc6ff78a910 (LWP 2033)):
#0  0x00007fc721c205a9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fc724ea64fb in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#2  0x00007fc7212dd78c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fc724ea5445 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fc721c1ba04 in start_thread () from /lib/libpthread.so.0
#5  0x00007fc7227fb7bd in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fc72546a750 (LWP 2032)):
[KCrash Handler]
#5  0x00007fc72279e4de in memcpy () from /lib/libc.so.6
#6  0x00007fc724ee88fe in QString::realloc(int) () from /usr/lib/libQtCore.so.4
#7  0x00007fc724ee8a29 in QString::utf16() const () from /usr/lib/libQtCore.so.4
#8  0x00007fc724ee8b4c in QString::toUcs4() const () from /usr/lib/libQtCore.so.4
#9  0x00007fc702bc2d50 in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtCore.so
#10 0x00007fc7030d7a3b in _PyObject_Str () from /usr/lib/libpython2.6.so.1.0
#11 0x00007fc7030d7b3a in PyObject_Str () from /usr/lib/libpython2.6.so.1.0
#12 0x00007fc7030e6ab7 in ?? () from /usr/lib/libpython2.6.so.1.0
#13 0x00007fc7030ed9d3 in ?? () from /usr/lib/libpython2.6.so.1.0
#14 0x00007fc703092e53 in PyObject_Call () from /usr/lib/libpython2.6.so.1.0
#15 0x00007fc703133f97 in PyEval_EvalFrameEx () from /usr/lib/libpython2.6.so.1.0
#16 0x00007fc703136975 in PyEval_EvalCodeEx () from /usr/lib/libpython2.6.so.1.0
#17 0x00007fc7030bee80 in ?? () from /usr/lib/libpython2.6.so.1.0
#18 0x00007fc703092e53 in PyObject_Call () from /usr/lib/libpython2.6.so.1.0
#19 0x00007fc7030a364f in ?? () from /usr/lib/libpython2.6.so.1.0
#20 0x00007fc703092e53 in PyObject_Call () from /usr/lib/libpython2.6.so.1.0
#21 0x00007fc70312ee43 in PyEval_CallObjectWithKeywords () from /usr/lib/libpython2.6.so.1.0
#22 0x00007fc702880678 in sip_api_invoke_slot () from /usr/lib/pymodules/python2.6/sip.so
#23 0x00007fc702bbe846 in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtCore.so
#24 0x00007fc702bbe95c in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtCore.so
#25 0x00007fc702bbea1a in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtCore.so
#26 0x00007fc724fa0ddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#27 0x00007fc723bf3a22 in KWallet::Wallet::walletOpened(bool) () from /usr/lib/libkdeui.so.5
#28 0x00007fc723bf4940 in KWallet::Wallet::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib/libkdeui.so.5
#29 0x00007fc724fa0ddc in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#30 0x00007fc723cb608f in ?? () from /usr/lib/libkdeui.so.5
#31 0x00007fc723cb6621 in ?? () from /usr/lib/libkdeui.so.5
#32 0x00007fc72100ead4 in ?? () from /usr/lib/libQtDBus.so.4
#33 0x00007fc721015def in ?? () from /usr/lib/libQtDBus.so.4
#34 0x00007fc724f9b0f9 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#35 0x00007fc722f3befc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#36 0x00007fc722f431ce in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#37 0x00007fc723b72ab6 in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#38 0x00007fc724f8bc2c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#39 0x00007fc724f8c80a in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#40 0x00007fc724fb4533 in ?? () from /usr/lib/libQtCore.so.4
#41 0x00007fc721e6cbbe in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#42 0x00007fc721e70588 in ?? () from /lib/libglib-2.0.so.0
#43 0x00007fc721e706b0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#44 0x00007fc724fb41a6 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#45 0x00007fc722fd04be in ?? () from /usr/lib/libQtGui.so.4
#46 0x00007fc724f8a532 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#47 0x00007fc724f8a904 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#48 0x00007fc724f8cab9 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#49 0x00007fc71a6fb4cf in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#50 0x0000000000406da8 in _start ()

Reported using DrKonqi