Bug 199300

Did you installed KDE from Ubuntu packages or from any other way?
THanks

I have them installed from Kubuntu Backports PPA (http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu)

I'm not so sure whether does this help, but in my case, I've removed .local and .config which is located in home directory(Additional, I've also removed all FILES in ~/.kde/cache-{systemname}/ and all FILES in ~/.kde/cache-{systemname}/kpc.) then re-login and that crash of kbuildsyscoca4 has gone.

I also experienced this bug when I updated kde from the kubuntu Backports PPA.
Now I can't start kde or run any kde apps from gnome, I get a kbuildsycoca4 crash.
The "KDE Crash Handler" that automatically starts gives the following information:

Application that crashed: kbuildsycoca4
Version of the application: 1.1
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

 -- Backtrace:
Application: KBuildSycoca (kbuildsycoca4), signal: Segmentation fault
[KCrash Handler]
#5  KSycocaEntry::offset (this=0x0) at /build/buildd/kde4libs-4.3.0/kdecore/sycoca/ksycocaentry.cpp:132
#6  0x00007f71e521f9a8 in KBuildMimeTypeFactory::savePatternLists (this=0x14cc320, str=@0x148ca30) at /build/buildd/kde4libs-4.3.0/kded/kbuildmimetypefactory.cpp:361
#7  0x00007f71e521fe63 in KBuildMimeTypeFactory::save (this=0x14cc320, str=@0x148ca30) at /build/buildd/kde4libs-4.3.0/kded/kbuildmimetypefactory.cpp:307
#8  0x00007f71e5218d61 in KBuildSycoca::save (this=0x14cccb0, str=0x148ca30) at /build/buildd/kde4libs-4.3.0/kded/kbuildsycoca.cpp:525
#9  0x00007f71e521af05 in KBuildSycoca::recreate (this=0x14cccb0) at /build/buildd/kde4libs-4.3.0/kded/kbuildsycoca.cpp:433
#10 0x00007f71e521cd5c in kdemain (argc=1, argv=0x7fffed667b78) at /build/buildd/kde4libs-4.3.0/kded/kbuildsycoca.cpp:829
#11 0x00007f71e1d925a6 in __libc_start_main (main=0x4007d0 <main>, argc=1, ubp_av=0x7fffed667b78, init=0x400800 <__libc_csu_init>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
    stack_end=0x7fffed667b68) at libc-start.c:220
#12 0x0000000000400709 in _start () at ../sysdeps/x86_64/elf/start.S:113

I think bug 202871 is a duplicate of this bug, because if I remove the ~/.local/share/mime/globs file, the problem is resolved. And I can confirm the description of that bug 202871: kbuildsycoca4 also crashes if ~/.local/share/mime/globs is empty.

*** Bug 206720 has been marked as a duplicate of this bug. ***

*** Bug 199745 has been marked as a duplicate of this bug. ***

*** This bug has been marked as a duplicate of bug 202871 ***

Reopening as this is a different crash.
Christoph's comments (comment 4 and comment 5) are indeed bug 202871 (which is fixed in SC 4.4beta2), but it seems they are unrelated to this (which is still unfixed).

From bug 219550:
---
What I was doing when the application crashed:
I was installing a number of new packages through Add/Remove Applications
including some that required confirmation, such as Sun Java 6.  The message
appeared after to downloads, while the packages were being installed -- but I
can't remember which package was being installed at the time.

*** Bug 219550 has been marked as a duplicate of this bug. ***

Everyone with this crash: please check if you don't have the umask problem that leads to bug 202871 (I'm still not sure if it's the same bug or not).

More precisely: type
 ls -l ~/.local/share/mime
and check if any directory misses "x" permissions in the 4th character, like
 drw-r--r--

If so, making the directory executable (+x) again will fix the crash, and then this is the same as 202871. Otherwise, I need a way to reproduce this one...

Also, is anyone here not using Ubuntu? From a quick look, it seems like a Ubuntu-only crash?

*** Bug 221271 has been marked as a duplicate of this bug. ***

*** Bug 225071 has been marked as a duplicate of this bug. ***

fixed in kde 4.4