nepomukservicestub crashed with SIGSEGV in _int_malloc()

[Bzzz]

Related to https://bugs.kde.org/show_bug.cgi?id=264354 - crash reporter opened on re-login after Xorg crashed for no apparent reason, this time in firefox 3.6.15pre about 10 seconds after switching over from a tty.

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: kdebase-runtime 4:4.5.1-0ubuntu3.1
ProcVersionSignature: Ubuntu 2.6.35-25.44-generic 2.6.35.10
Uname: Linux 2.6.35-25-generic x86_64
Architecture: amd64
CrashCounter: 1
Date: Sun Jan 30 18:23:25 2011
ExecutablePath: /usr/bin/nepomukservicestub
InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
ProcCmdline: /usr/bin/nepomukservicestub nepomukstorage
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
 LANGUAGE=
SegvAnalysis:
 Segfault happened at: 0x7ffbb6069ced <_int_malloc+13>: mov %rbx,-0x30(%rsp)
 PC (0x7ffbb6069ced) ok
 source "%rbx" ok
 destination "-0x30(%rsp)" (0x7ffb9b6e4ff8) in non-writable VMA region: 0x7ffb9b6e4000-0x7ffb9b6e5000 ---p None
 Stack memory exhausted (SP below stack segment)
SegvReason: writing VMA None
Signal: 11
SourcePackage: kdebase-runtime
StacktraceTop:
 _int_malloc (av=0x7ffbb636de40, bytes=120) at malloc.c:4249
 __libc_malloc (bytes=120) at malloc.c:3660
 operator new(unsigned long) () from /usr/lib/libstdc++.so.6
 QMutex::QMutex (this=0x40c2160, mode=120) at thread/qmutex.cpp:124
 QPostEventList (this=0x40c2120, initialRefCount=<value optimized out>) at thread/qthread_p.h:110
Title: nepomukservicestub crashed with SIGSEGV in _int_malloc()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors: (process:29453): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed