Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-2-amd64 x86_64
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
Plasma desktop crashed due to a SEGFAULT I think, it is possible that nvidia driver are to blame. After login I get a blank screen. I am able to use  programs I just don't have desktop.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#5  0x00007ff997075411 in strlen () from /lib/libc.so.6
#6  0x00007ff97c18b3c6 in PyString_FromFormatV (format=0x7ff97b942ab0 "the sip module implements API v%d.0 but the %s module requires API v%d.%d", vargs=0x7fff88b34120)
    at ../Objects/stringobject.c:211
#7  0x00007ff97c1d8cd0 in PyErr_Format (exception=0x7ff97c446540, format=0xfffffff0 <Address 0xfffffff0 out of bounds>) at ../Python/errors.c:522
#8  0x00007ff97b93f5d5 in ?? () from /usr/lib/pymodules/python2.5/sip.so
#9  0x00007ff97ac889d5 in initplasma () from /usr/lib/pymodules/python2.5/PyKDE4/plasma.so
#10 0x00007ff97c1e2eec in _PyImport_LoadDynamicModule (name=0x7fff88b353b0 "PyKDE4.plasma", pathname=0x7fff88b342e0 "/usr/lib/pymodules/python2.5/PyKDE4/plasma.so", fp=<value optimized out>)
    at ../Python/importdl.c:53
#11 0x00007ff97c1e1433 in import_submodule (mod=0x1fe7750, subname=0x7fff88b353b7 "plasma", fullname=0x7fff88b353b0 "PyKDE4.plasma") at ../Python/import.c:2400
#12 0x00007ff97c1e16c2 in load_next (mod=0x1fe7750, altmod=0x1fe7750, p_name=<value optimized out>, buf=0x7fff88b353b0 "PyKDE4.plasma", p_buflen=0x7fff88b363b8) at ../Python/import.c:2220
#13 0x00007ff97c1e1d26 in import_module_level (name=0x0, globals=<value optimized out>, locals=<value optimized out>, fromlist=0x1e82a90, level=<value optimized out>) at ../Python/import.c:2008
#14 0x00007ff97c1e20af in PyImport_ImportModuleLevel (name=0x1e8ab7c "PyKDE4.plasma", globals=0x1e9b060, locals=0x1e9b060, fromlist=0x1e82a90, level=-1) at ../Python/import.c:2072
#15 0x00007ff97c1c491d in builtin___import__ (self=<value optimized out>, args=<value optimized out>, kwds=<value optimized out>) at ../Python/bltinmodule.c:47
#16 0x00007ff97c142103 in PyObject_Call (func=0xfffffff0, arg=0xffffffff, kw=0x18) at ../Objects/abstract.c:1861
#17 0x00007ff97c1c4eee in PyEval_CallObjectWithKeywords (func=0x1e125f0, arg=0x1e7e788, kw=0x0) at ../Python/ceval.c:3481
#18 0x00007ff97c1c8502 in PyEval_EvalFrameEx (f=0x1e47030, throwflag=<value optimized out>) at ../Python/ceval.c:2093
#19 0x00007ff97c1cbbc5 in PyEval_EvalCodeEx (co=0x1e853f0, globals=<value optimized out>, locals=<value optimized out>, args=0x0, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0)
    at ../Python/ceval.c:2875
#20 0x00007ff97c1cbdb2 in PyEval_EvalCode (co=0xfffffff0, globals=0xffffffff, locals=0x18) at ../Python/ceval.c:514
#21 0x00007ff97c1de40e in PyImport_ExecCodeModuleEx (name=0x7fff88b38930 "pyappletscript", co=0x1e853f0, pathname=0x7fff88b367f0 "/usr/share/kde4/apps/plasma_scriptengine_python/pyappletscript.pyc")
    at ../Python/import.c:675
#22 0x00007ff97c1de690 in load_source_module (name=0x7fff88b38930 "pyappletscript", pathname=0x7fff88b367f0 "/usr/share/kde4/apps/plasma_scriptengine_python/pyappletscript.pyc", 
    fp=<value optimized out>) at ../Python/import.c:959
#23 0x00007ff97c1e1433 in import_submodule (mod=0x7ff97c450230, subname=0x7fff88b38930 "pyappletscript", fullname=0x7fff88b38930 "pyappletscript") at ../Python/import.c:2400
#24 0x00007ff97c1e16c2 in load_next (mod=0x7ff97c450230, altmod=0x7ff97c450230, p_name=<value optimized out>, buf=0x7fff88b38930 "pyappletscript", p_buflen=0x7fff88b39938) at ../Python/import.c:2220
#25 0x00007ff97c1e1ce2 in import_module_level (name=0x0, globals=0x1e93aa0, locals=<value optimized out>, fromlist=0x1e1b680, level=32062112) at ../Python/import.c:2001
#26 0x00007ff97c1e20af in PyImport_ImportModuleLevel (name=0x1e8a284 "pyappletscript", globals=0x1e93aa0, locals=0x1e93aa0, fromlist=0x1e1b680, level=-1) at ../Python/import.c:2072
#27 0x00007ff97c1c491d in builtin___import__ (self=<value optimized out>, args=<value optimized out>, kwds=<value optimized out>) at ../Python/bltinmodule.c:47
#28 0x00007ff97c142103 in PyObject_Call (func=0xfffffff0, arg=0xffffffff, kw=0x18) at ../Objects/abstract.c:1861
#29 0x00007ff97c14623e in PyObject_CallFunctionObjArgs (callable=0x1e125f0) at ../Objects/abstract.c:2091
#30 0x00007ff97c1e2275 in PyImport_Import (module_name=0x1e8a260) at ../Python/import.c:2576
#31 0x00007ff97c1e2445 in PyImport_ImportModule (name=<value optimized out>) at ../Python/import.c:1972
#32 0x00007ff97c47ce16 in ?? () from /usr/lib/kde4/kpythonpluginfactory.so
#33 0x00007ff97c47f13c in ?? () from /usr/lib/kde4/kpythonpluginfactory.so
#34 0x00007ff9911df987 in ?? () from /usr/lib/libplasma.so.3
#35 0x00007ff9911dfefe in Plasma::loadScriptEngine(QString const&, Plasma::Applet*) () from /usr/lib/libplasma.so.3
#36 0x00007ff991175535 in ?? () from /usr/lib/libplasma.so.3
#37 0x00007ff9911762d9 in Plasma::Applet::Applet(QObject*, QList<QVariant> const&) () from /usr/lib/libplasma.so.3
#38 0x00007ff991176e25 in Plasma::Applet::load(QString const&, unsigned int, QList<QVariant> const&) () from /usr/lib/libplasma.so.3
#39 0x00007ff991185a60 in ?? () from /usr/lib/libplasma.so.3
#40 0x00007ff991188989 in Plasma::Containment::restoreContents(KConfigGroup&) () from /usr/lib/libplasma.so.3
#41 0x00007ff99118af13 in Plasma::Containment::restore(KConfigGroup&) () from /usr/lib/libplasma.so.3
#42 0x00007ff99118e182 in Plasma::Corona::loadLayout(QString const&) () from /usr/lib/libplasma.so.3
#43 0x00007ff99118fd32 in Plasma::Corona::initializeLayout(QString const&) () from /usr/lib/libplasma.so.3
#44 0x00007ff98d9bc72c in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#45 0x00007ff98d9bc8b8 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#46 0x00007ff98d9c09ed in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#47 0x00007ff9998c2df2 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQtCore.so.4
#48 0x00007ff9998c7f5f in ?? () from /usr/lib/libQtCore.so.4
#49 0x00007ff9998bd353 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#50 0x00007ff99783701d in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#51 0x00007ff99783f07a in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#52 0x00007ff9984900db in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#53 0x00007ff9998adc9c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#54 0x00007ff9998da2c6 in ?? () from /usr/lib/libQtCore.so.4
#55 0x00007ff9998d6634 in ?? () from /usr/lib/libQtCore.so.4
#56 0x00007ff99674f12a in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#57 0x00007ff996752988 in ?? () from /lib/libglib-2.0.so.0
#58 0x00007ff996752b3c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#59 0x00007ff9998d639c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#60 0x00007ff9978cdf1f in ?? () from /usr/lib/libQtGui.so.4
#61 0x00007ff9998ac562 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#62 0x00007ff9998ac934 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#63 0x00007ff9998aeba4 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#64 0x00007ff98d9a726b in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#65 0x0000000000407264 in _start ()

This bug may be a duplicate of or related to bug 214776

Reported using DrKonqi