Application that crashed: kbuildsycoca4
Version of the application: 1.1
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-20-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I was checking my facebook on google chrome (there was no picture/video/flash content) and then opened a new tab and tried to click the address bar. kdeinit crashed and took me back to login screen.

 -- Backtrace:
Application: KBuildSycoca (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  0x00bd310f in ?? () from /lib/tls/i686/cmov/libc.so.6
#7  0x00bd468f in ?? () from /lib/tls/i686/cmov/libc.so.6
#8  0x00bd77cd in free () from /lib/tls/i686/cmov/libc.so.6
#9  0x0097e68d in qFree (ptr=0x9a09290) at global/qmalloc.cpp:60
#10 0x0098b569 in ~QByteArray (this=0x9a02294, data=0x9a04488) at ../../include/QtCore/../../src/corelib/tools/qbytearray.h:375
#11 QList<QByteArray>::node_destruct (this=0x9a02294, data=0x9a04488) at ../../include/QtCore/../../src/corelib/tools/qlist.h:369
#12 QList<QByteArray>::free (this=0x9a02294, data=0x9a04488) at ../../include/QtCore/../../src/corelib/tools/qlist.h:559
#13 0x00a096f7 in ~QList (this=0xcaa3d0, __in_chrg=<value optimized out>) at ../../include/QtCore/../../src/corelib/tools/qlist.h:534
#14 0x00a0cdc3 in ~QRingBuffer (this=0x9a02248, __in_chrg=<value optimized out>) at ../../include/QtCore/private/../../../src/corelib/tools/qringbuffer_p.h:62
#15 ~QIODevicePrivate (this=0x9a02248, __in_chrg=<value optimized out>) at io/qiodevice.cpp:129
#16 0x00a8b86a in ~QObject (this=0x9a05128, __in_chrg=<value optimized out>) at kernel/qobject.cpp:857
#17 0x00a0cca8 in ~QIODevice (this=0x9a05128, __in_chrg=<value optimized out>) at io/qiodevice.cpp:399
#18 0x00316da5 in ~KNoDebugStream () at ../../kdecore/io/kdebug.cpp:96
#19 ~KSyslogDebugStream () at ../../kdecore/io/kdebug.cpp:107
#20 ~KDebugPrivate () at ../../kdecore/io/kdebug.cpp:235
#21 destroy () at ../../kdecore/io/kdebug.cpp:587
#22 0x002e0e1b in ~KCleanUpGlobalStatic (this=0x49b474, __in_chrg=<value optimized out>) at ../../kdecore/kernel/kglobal.h:62
#23 0x00b9705f in ?? () from /lib/tls/i686/cmov/libc.so.6
#24 0x00b970cf in exit () from /lib/tls/i686/cmov/libc.so.6
#25 0x0804dde9 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=1, envs=0x99a2495 "DISPLAY=:0.0", reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x99a24a6 "icalper-laptop;1270822341;137639;2431_TIME0") at ../../kinit/kinit.cpp:677
#26 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#27 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#28 0x0804fcef in main (argc=2, argv=0xbfc829a4, envp=0xbfc829b0) at ../../kinit/kinit.cpp:1745

Reported using DrKonqi