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 2.6.31-17-generic x86_64
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
Happens seemingly randomly. Twice at login, twice when I install any application (apt-get, Ubuntu Software Manager, Synaptic), and whenever it feels like it.

 -- Backtrace:
Application: KBuildSycoca (kdeinit4), signal: Segmentation fault
The current source language is "auto; currently c".
[KCrash Handler]
#5  KSycocaEntry::offset (this=0x0) at ../../kdecore/sycoca/ksycocaentry.cpp:133
#6  0x00007f55465465dd in KBuildMimeTypeFactory::savePatternLists (this=0xccb210, str=<value optimized out>) at ../../kded/kbuildmimetypefactory.cpp:361
#7  0x00007f5546546a93 in KBuildMimeTypeFactory::save (this=0xccb210, str=...) at ../../kded/kbuildmimetypefactory.cpp:307
#8  0x00007f554653fda9 in KBuildSycoca::save (this=0x11372e0, str=0xcbad30) at ../../kded/kbuildsycoca.cpp:525
#9  0x00007f5546542ab3 in KBuildSycoca::recreate (this=0x11372e0) at ../../kded/kbuildsycoca.cpp:433
#10 0x00007f5546543ee6 in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../kded/kbuildsycoca.cpp:829
#11 0x0000000000406da8 in launch (argc=2, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=16, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0xc06dfd "") at ../../kinit/kinit.cpp:677
#12 0x0000000000407aa0 in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#13 0x0000000000407f51 in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1362
#14 0x0000000000408bb2 in main (argc=2, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1793

This bug may be a duplicate of or related to bug 221873

Reported using DrKonqi