plasma-desktop crashes at start

Application: plasma-desktop (0.4)
KDE Platform Version: 4.8.00 (4.8.0
Qt Version: 4.8.0
Operating System: Linux 3.2.0-10-generic i686
Distribution: Ubuntu precise (development branch)

-- Information about the crash:

When i login to kde, plasma crashes. If i try start it manually with
"plasma-desktop" it crashes again.
I have just updated to kde 4.8.0, and all was ok, but today morning i updated
few more new packages. I think it may be python-qt4 issue, because it was one
of updated packages.

After downgrading python-qt4, python-qt4-dbus, python-qt4-sql from 4.9-2ubuntu2
to 4.9-2ubuntu1 plasma-desktop starts normally.

Here is aptitude log:

01/26/12 12:09:52 PM Aptitude 0.6.4: log report
01/26/12 12:09:52 PM Thu, Jan 26 2012 11:33:11 +0400
01/26/12 12:09:52 PM
01/26/12 12:09:52 PM IMPORTANT: this log only lists intended
actions; actions which fail due to
01/26/12 12:09:52 PM dpkg problems may not be completed.
01/26/12 12:09:52 PM
01/26/12 12:09:52 PM Will install 13 packages, and remove 0
packages.
01/26/12 12:09:52 PM 207 kB of disk space will be used
01/26/12 12:09:52 PM
===============================================================================
01/26/12 12:09:52 PM [UPGRADE] kdeedu 5:71~pre15ubuntu9 ->
5:71~pre15ubuntu10
01/26/12 12:09:52 PM [UPGRADE] kdegraphics 5:71~pre15ubuntu9 ->
5:71~pre15ubuntu10
01/26/12 12:09:52 PM [UPGRADE] kdeutils 5:71~pre15ubuntu9 ->
5:71~pre15ubuntu10
01/26/12 12:09:52 PM [UPGRADE] kgpg 4:4.7.97-0ubuntu1 ->
4:4.8.0a-0ubuntu1
01/26/12 12:09:52 PM [UPGRADE] khangman 4:4.7.97-0ubuntu1 ->
4:4.8.0-0ubuntu1
01/26/12 12:09:52 PM [UPGRADE] konsole 4:4.7.97-0ubuntu1 ->
4:4.8.0-0ubuntu1
01/26/12 12:09:52 PM [UPGRADE] ksaneplugin 4:4.7.97-0ubuntu1 ->
4:4.8.0-0ubuntu1
01/26/12 12:09:52 PM [UPGRADE] ksnapshot 4:4.7.97-0ubuntu1 ->
4:4.8.0-0ubuntu1
01/26/12 12:09:52 PM [UPGRADE] kwordquiz 4:4.7.97-0ubuntu1 ->
4:4.8.0-0ubuntu1
01/26/12 12:09:52 PM [UPGRADE] libindicator3-7 0.4.90-0ubuntu3 ->
0.4.90-0ubuntu4
01/26/12 12:09:52 PM [UPGRADE] python-qt4 4.9-2ubuntu1 ->
4.9-2ubuntu2
01/26/12 12:09:52 PM [UPGRADE] python-qt4-dbus 4.9-2ubuntu1 ->
4.9-2ubuntu2
01/26/12 12:09:52 PM [UPGRADE] python-qt4-sql 4.9-2ubuntu1 ->
4.9-2ubuntu2
01/26/12 12:09:52 PM
===============================================================================
01/26/12 12:09:52 PM
01/26/12 12:09:52 PM Log complete.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xb77d8720 (LWP 2219))]

Thread 2 (Thread 0xaeb35b70 (LWP 2260)):
#0 0x00701416 in __kernel_vsyscall ()
#1 0x004002ce in __GI___poll (fds=0x97c8e48, nfds=1, timeout=-1) at
../sysdeps/unix/sysv/linux/poll.c:87
#2 0x026904ab in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3 0x02682a7e in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4 0x02682bd1 in g_main_context_iteration () from
/lib/i386-linux-gnu/libglib-2.0.so.0
#5 0x07ed0f17 in QEventDispatcherGlib::processEvents (this=0x97c7ca8,
flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6 0x07e9cb3d in QEventLoop::processEvents (this=0xaeb35290, flags=...) at
kernel/qeventloop.cpp:149
#7 0x07e9cdd9 in QEventLoop::exec (this=0xaeb35290, flags=...) at
kernel/qeventloop.cpp:204
#8 0x07d868fc in QThread::exec (this=0x97c6bc8) at thread/qthread.cpp:501
#9 0x07e7a1dd in QInotifyFileSystemWatcherEngine::run (this=0x97c6bc8) at
io/qfilesystemwatcher_inotify.cpp:248
#10 0x07d89d90 in QThreadPrivate::start (arg=0x97c6bc8) at
thread/qthread_unix.cpp:298
#11 0x0681ec87 in start_thread (arg=0xaeb35b70) at pthread_create.c:304
#12 0x0040e68e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb77d8720 (LWP 2219)):
[KCrash Handler]
#7 createClassType (client=0xad5eae40, ctd=0xad5f2e40, mod_dict=) at
/build/buildd/sip4-4.13.1/siplib/siplib.c:5502
#8 0x067f96b4 in sip_api_init_module (client=0xad5eae40, mod_dict=) at
/build/buildd/sip4-4.13.1/siplib/siplib.c:1418
#9 0xad47a8b7 in initkdecore () at sip/kdecore/sipkdecorepart0.cpp:5361
#10 0xae100e5c in _PyImport_LoadDynamicModule () from
/usr/lib/libpython2.7.so.1.0
#11 0xae197e40 in load_module.39482 () from /usr/lib/libpython2.7.so.1.0
#12 0xae1980a9 in import_submodule.39501 () from /usr/lib/libpython2.7.so.1.0
#13 0xae17e599 in load_next.39506 () from /usr/lib/libpython2.7.so.1.0
#14 0xae1986f6 in import_module_level.isra.9 () from
/usr/lib/libpython2.7.so.1.0
#15 0xae192077 in PyImport_ImportModuleLevel () from
/usr/lib/libpython2.7.so.1.0
#16 0xae099533 in builtin___import__ () from /usr/lib/libpython2.7.so.1.0
#17 0xae18a24d in PyCFunction_Call () from /usr/lib/libpython2.7.so.1.0
#18 0xae188d84 in PyObject_Call () from /usr/lib/libpython2.7.so.1.0
#19 0xae18997f in call_function_tail () from /usr/lib/libpython2.7.so.1.0
#20 0xae13dc40 in PyObject_CallFunction () from /usr/lib/libpython2.7.so.1.0
#21 0xae10157f in PyImport_Import () from /usr/lib/libpython2.7.so.1.0
#22 0xae1028b2 in PyImport_ImportModule () from /usr/lib/libpython2.7.so.1.0
#23 0x067f1c18 in sip_api_export_module (client=0xad98d2a0, api_major=8,
api_minor=1, unused=0x0) at /build/buildd/sip4-4.13.1/siplib/siplib.c:1242
#24 0xad6f7489 in initplasma () at sip/plasma/sipplasmapart0.cpp:3012
#25 0xae100e5c in _PyImport_LoadDynamicModule () from
/usr/lib/libpython2.7.so.1.0
#26 0xae197e40 in load_module.39482 () from /usr/lib/libpython2.7.so.1.0
#27 0xae1980a9 in import_submodule.39501 () from /usr/lib/libpython2.7.so.1.0
#28 0xae17e599 in load_next.39506 () from /usr/lib/libpython2.7.so.1.0
#29 0xae1986f6 in import_module_level.isra.9 () from
/usr/lib/libpython2.7.so.1.0
#30 0xae192077 in PyImport_ImportModuleLevel () from
/usr/lib/libpython2.7.so.1.0
#31 0xae099533 in builtin___import__ () from /usr/lib/libpython2.7.so.1.0
#32 0xae18a24d in PyCFunction_Call () from /usr/lib/libpython2.7.so.1.0
#33 0xae188d84 in PyObject_Call () from /usr/lib/libpython2.7.so.1.0
#34 0xae18971b in PyEval_CallObjectWithKeywords () from
/usr/lib/libpython2.7.so.1.0
#35 0xae0e4e58 in PyEval_EvalFrameEx () from /usr/lib/libpython2.7.so.1.0
#36 0xae09d332 in PyEval_EvalCodeEx () from /usr/lib/libpython2.7.so.1.0
#37 0xae09d673 in PyEval_EvalCode () from /usr/lib/libpython2.7.so.1.0
#38 0xae09ee82 in PyImport_ExecCodeModuleEx () from
/usr/lib/libpython2.7.so.1.0
#39 0xae19794c in load_source_module.39443 () from /usr/lib/libpython2.7.so.1.0
#40 0xae1980a9 in import_submodule.39501 () from /usr/lib/libpython2.7.so.1.0
#41 0xae17e599 in load_next.39506 () from /usr/lib/libpython2.7.so.1.0
#42 0xae1986b6 in import_module_level.isra.9 () from
/usr/lib/libpython2.7.so.1.0
#43 0xae192077 in PyImport_ImportModuleLevel () from
/usr/lib/libpython2.7.so.1.0
#44 0xae099533 in builtin___import__ () from /usr/lib/libpython2.7.so.1.0
#45 0xae18a24d in PyCFunction_Call () from /usr/lib/libpython2.7.so.1.0
#46 0xae188d84 in PyObject_Call () from /usr/lib/libpython2.7.so.1.0
#47 0xae18997f in call_function_tail () from /usr/lib/libpython2.7.so.1.0
#48 0xae13dc40 in PyObject_CallFunction () from /usr/lib/libpython2.7.so.1.0
#49 0xae10157f in PyImport_Import () from /usr/lib/libpython2.7.so.1.0
#50 0xae1028b2 in PyImport_ImportModule () from /usr/lib/libpython2.7.so.1.0
#51 0x080fd720 in ImportModule (moduleName=...) at
../../kpythonpluginfactory/kpythonpluginfactory.cpp:298
#52 0x080fe901 in KPythonPluginFactory::create (this=0x98672d8, iface=0x982fe0
"Plasma::AppletScript", parentWidget=0x0, parent=0x9867800, args=...,
keyword=...) at ../../kpythonpluginfactory/kpythonpluginfactory.cpp:153
#53 0x0087f75f in create<Plasma::AppletScript> (keyword=..., parent=0x9867800,
this=0x98672d8, args=..., parentWidget=0x0) at
../../kdecore/util/kpluginfactory.h:531
#54 createInstance<Plasma::AppletScript> (error=0xbf7fede0, args=...,
parent=0x9867800, parentWidget=0x0, this=0x9860cd8) at
../../kdecore/services/kservice.h:553
#55 createInstance<Plasma::AppletScript> (error=0xbf7fede0, args=...,
parent=0x9867800, this=0x9860cd8) at ../../kdecore/services/kservice.h:530
#56 Plasma::loadEngine (language=..., type=Plasma::AppletComponent,
parent=0x9867800) at ../../plasma/scripting/scriptengine.cpp:175
#57 0x008808e6 in Plasma::loadScriptEngine (language=..., applet=0x9867800) at
../../plasma/scripting/scriptengine.cpp:205
#58 0x007b1993 in Plasma::AppletPrivate::init (this=0x9804d90, packagePath=...)
at ../../plasma/applet.cpp:2782
#59 0x007b2612 in Plasma::Applet::Applet (this=0x9867800, parentObject=0x0,
args=...) at ../../plasma/applet.cpp:193
#60 0x008044ff in Plasma::PluginLoader::loadApplet (this=0x9070d10, name=...,
appletId=<optimized out>, args=...) at ../../plasma/pluginloader.cpp:134
#61 0x007a96b4 in Plasma::Applet::load (appletName=..., appletId=245, args=...)
at ../../plasma/applet.cpp:2416
#62 0x05c3546e in SystemTray::PlasmoidTask::setupApplet (this=0x9804b30,
plugin=..., id=245) at
../../../../../plasma/generic/applets/systemtray/protocols/plasmoid/plasmoidtask.cpp:137
#63 0x05c33340 in SystemTray::PlasmoidProtocol::addApplet (this=0x9211040,
appletName=..., id=245, parent=0x91840b8) at
../../../../../plasma/generic/applets/systemtray/protocols/plasmoid/plasmoidtaskprotocol.cpp:101
#64 0x05c3477c in SystemTray::PlasmoidProtocol::loadFromConfig (this=0x9211040,
parent=0x91840b8) at
../../../../../plasma/generic/applets/systemtray/protocols/plasmoid/plasmoidtaskprotocol.cpp:83
#65 0x05c2ab89 in SystemTray::Manager::loadApplets (this=0x9210648,
parent=0x91840b8) at
../../../../../plasma/generic/applets/systemtray/core/manager.cpp:105
#66 0x05c40bba in SystemTray::Applet::configChanged (this=0x91840b8) at
../../../../../plasma/generic/applets/systemtray/ui/applet.cpp:207
#67 0x05c3e449 in SystemTray::Applet::constraintsEvent (this=0x91840b8,
constraints=...) at
../../../../../plasma/generic/applets/systemtray/ui/applet.cpp:254
#68 0x007b6d98 in Plasma::Applet::flushPendingConstraintsEvents
(this=0x91840b8) at ../../plasma/applet.cpp:1365
#69 0x007c8c50 in Plasma::ContainmentPrivate::initApplets (this=0x910d1d8) at
../../plasma/containment.cpp:470
#70 0x007de351 in Plasma::CoronaPrivate::importLayout (this=0x90b6638,
conf=..., mergeConfig=false) at ../../plasma/corona.cpp:1067
#71 0x007df175 in Plasma::Corona::loadLayout (this=0x8f2b118, configName=...)
at ../../plasma/corona.cpp:278
#72 0x007df24e in Plasma::Corona::initializeLayout (this=0x8f2b118,
configName=...) at ../../plasma/corona.cpp:181
#73 0x00b32151 in PlasmaApp::corona (this=0x8f1e950, createIfMissing=true) at
../../../../plasma/desktop/shell/plasmaapp.cpp:833
#74 0x00b324b4 in PlasmaApp::setupDesktop (this=0x8f1e950) at
../../../../plasma/desktop/shell/plasmaapp.cpp:312
#75 0x00b33941 in qt_static_metacall (_a=0x8fe3c88, _id=14, _o=0x8f1e950,
_c=<optimized out>) at ./plasmaapp.moc:119
#76 PlasmaApp::qt_static_metacall (_o=0x8f1e950,
_c=QMetaObject::InvokeMetaMethod, _id=14, _a=0x8fe3c88) at ./plasmaapp.moc:97
#77 0x07eb0231 in QMetaCallEvent::placeMetaCall (this=0x9025a00,
object=0x8f1e950) at kernel/qobject.cpp:525
#78 0x07eb92ab in QObject::event (this=0x8f1e950, e=0x9025a00) at
kernel/qobject.cpp:1195
#79 0x07e9e5ba in QCoreApplication::event (this=0x8f1e950, e=0x9025a00) at
kernel/qcoreapplication.cpp:1688
#80 0x0153636d in QApplication::event (this=0x8f1e950, e=0x9025a00) at
kernel/qapplication.cpp:2537
#81 0x01531c94 in notify_helper (e=0x9025a00, receiver=0x8f1e950,
this=0x8f2ff78) at kernel/qapplication.cpp:4555
#82 QApplicationPrivate::notify_helper (this=0x8f2ff78, receiver=0x8f1e950,
e=0x9025a00) at kernel/qapplication.cpp:4527
#83 0x015370cd in QApplication::notify (this=0x9025a00, receiver=0x8f1e950,
e=0x9025a00) at kernel/qapplication.cpp:4284
#84 0x011a07b1 in KApplication::notify (this=0x8f1e950, receiver=0x8f1e950,
event=0x9025a00) at ../../kdeui/kernel/kapplication.cpp:311
#85 0x07e9dfae in QCoreApplication::notifyInternal (this=0x8f1e950,
receiver=0x8f1e950, event=0x9025a00) at kernel/qcoreapplication.cpp:876
#86 0x07ea2108 in sendEvent (event=<optimized out>, receiver=<optimized out>)
at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#87 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0,
data=0x8ed5130) at kernel/qcoreapplication.cpp:1500
#88 0x07ea243c in QCoreApplication::sendPostedEvents (receiver=0x0,
event_type=0) at kernel/qcoreapplication.cpp:1393
#89 0x07ed0ac4 in sendPostedEvents () at
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#90 postEventSourceDispatch (s=0x8f308b0) at
kernel/qeventdispatcher_glib.cpp:279
#91 0x026826ea in g_main_context_dispatch () from
/lib/i386-linux-gnu/libglib-2.0.so.0
#92 0x02682af5 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#93 0x02682bd1 in g_main_context_iteration () from
/lib/i386-linux-gnu/libglib-2.0.so.0
#94 0x07ed0eb7 in QEventDispatcherGlib::processEvents (this=0x8ed5ea0,
flags=...) at kernel/qeventdispatcher_glib.cpp:424
#95 0x015e9dca in QGuiEventDispatcherGlib::processEvents (this=0x8ed5ea0,
flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#96 0x07e9cb3d in QEventLoop::processEvents (this=0xbf8003b4, flags=...) at
kernel/qeventloop.cpp:149
#97 0x07e9cdd9 in QEventLoop::exec (this=0xbf8003b4, flags=...) at
kernel/qeventloop.cpp:204
#98 0x07ea24ea in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#99 0x0152f834 in QApplication::exec () at kernel/qapplication.cpp:3816
#100 0x00b15a4b in kdemain (argc=1, argv=0xbf8005b4) at
../../../../plasma/desktop/shell/main.cpp:120
#101 0x0804850b in main (argc=1, argv=0xbf8005b4) at plasma-desktop_dummy.cpp:3