Application that crashed: kcmshell4
Version of the application: 
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.27.21-170.2.56.fc10.x86_64 x86_64
Distribution: "Fedora release 10 (Cambridge)"

What I was doing when the application crashed:
Login Manager did crash after the password query. System-settings styas open. Interesting is, i clicked a second time and it opened just fine. Maybe just a gremlin.

 -- Backtrace:
Application: KDE Control Module (kcmshell4), signal: Segmentation fault
[KCrash Handler]
#5  QDataStream::operator>> (this=0x0, i=@0x7fff2bef29e4) at io/qdatastream.cpp:661
#6  0x0000003a68536bc0 in KServiceFactory (this=0x2321d70) at /usr/src/debug/kdelibs-4.3.0/kdecore/services/kservicefactory.cpp:44
#7  0x0000003a68536e82 in KSycocaFactorySingleton<KServiceFactory>::self () at /usr/src/debug/kdelibs-4.3.0/kdecore/sycoca/ksycocafactory.h:200
#8  KServiceFactory::self () at /usr/src/debug/kdelibs-4.3.0/kdecore/services/kservicefactory.cpp:75
#9  0x0000003a6852d8d9 in KService::serviceByMenuId (_name=@0x7fff2bef29e4) at /usr/src/debug/kdelibs-4.3.0/kdecore/services/kservice.cpp:600
#10 0x0000003a685339c3 in KService::serviceByStorageId (_storageId=@0x7fff2bef29e4) at /usr/src/debug/kdelibs-4.3.0/kdecore/services/kservice.cpp:605
#11 0x0000003a6ba0602d in locateModule (module=@0x7fff2bef2e40) at /usr/src/debug/kdebase-runtime-4.3.0/kcmshell/main.cpp:73
#12 0x0000003a6ba073ff in kdemain (_argc=4, _argv=0x7fff2bef3508) at /usr/src/debug/kdebase-runtime-4.3.0/kcmshell/main.cpp:224
#13 0x000000349501e576 in __libc_start_main (main=0x400750 <main>, argc=4, ubp_av=0x7fff2bef3508, init=0x400780 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fff2bef34f8) at libc-start.c:220
#14 0x0000000000400689 in _start ()

Reported using DrKonqi