Application that crashed: kbuildsycoca4
Version of the application: 1.1
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-17-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
When I booted up the PC again, it told me that he had no permissions on my / home because it was mounted as read only, and each time I booted back told me the same. Using the fsck command tried to solve some corruption that had the system files from my / home. I found corruptions and managed. But apparently she spent the same. reused the fsck command and I was surprised because he turned to corrupt the file system. Until once I stop doing

 -- Backtrace:
Application: KBuildSycoca (kdeinit4), signal: Segmentation fault
[KCrash Handler]
#6  KSycocaEntry::offset (this=0x9eebdd8) at ../../kdecore/sycoca/ksycocaentry.cpp:133
#7  0x01e3e76f in KBuildMimeTypeFactory::save (this=0x9eebdd8, str=...) at ../../kded/kbuildmimetypefactory.cpp:307
#8  0x01e3745c in KBuildSycoca::save (this=0xa67a4b8, str=<value optimized out>) at ../../kded/kbuildsycoca.cpp:525
#9  0x01e3a24d in KBuildSycoca::recreate (this=0xa67a4b8) at ../../kded/kbuildsycoca.cpp:433
#10 0x01e3b90f in kdemain (argc=3, argv=0x9e78e40) at ../../kded/kbuildsycoca.cpp:829
#11 0x0804dde1 in launch (argc=<value optimized out>, _name=<value optimized out>, args=<value optimized out>, cwd=0x0, envc=1, envs=0x9e79273 "DISPLAY=:0.0", reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x9e79284 "janet;1264974286;521419;2565_TIME0") at ../../kinit/kinit.cpp:677
#12 0x0804ea35 in handle_launcher_request (sock=<value optimized out>, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#13 0x0804eeac in handle_requests (waitForPid=<value optimized out>) at ../../kinit/kinit.cpp:1362
#14 0x0804fcef in main (argc=2, argv=0xbfb5c3e4, envp=0xbfb5c3f0) at ../../kinit/kinit.cpp:1745

Reported using DrKonqi