mythbackend crashed with SIGSEGV in __pthread_mutex_lock()

[mathieg2]

Not sure whats going on

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: mythtv-backend 2:0.25.0~master.20120223.532cee8-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-17.27-generic-pae 3.2.6
Uname: Linux 3.2.0-17-generic-pae i686
NonfreeKernelModules: nvidia
ApportVersion: 1.94-0ubuntu1
Architecture: i386
CrashCounter: 1
Date: Sun Mar 4 10:54:27 2012
ExecutablePath: /usr/bin/mythbackend
Installed_mythtv_dbg: 0.0
ProcCmdline: /usr/bin/mythbackend --syslog local7 --user mythtv
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
SegvAnalysis:
 Segfault happened at: 0xb6723cb7 <pthread_mutex_lock+23>: mov 0xc(%esi),%edi
 PC (0xb6723cb7) ok
 source "0xc(%esi)" (0x0000000c) not located in a known VMA region (needed readable region)!
 destination "%edi" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: mythtv
StacktraceTop:
 pthread_mutex_lock () from /lib/i386-linux-gnu/libpthread.so.0
 QWaitCondition::wakeAll() () from /usr/lib/i386-linux-gnu/libQtCore.so.4
 PreviewGenerator::TeardownAll() () from /usr/lib/libmythtv-0.25.so.0
 PreviewGenerator::deleteLater() () from /usr/lib/libmythtv-0.25.so.0
 PreviewGeneratorQueue::~PreviewGeneratorQueue() () from /usr/lib/libmythtv-0.25.so.0
Title: mythbackend crashed with SIGSEGV in pthread_mutex_lock()
UpgradeStatus: Upgraded to precise on 2012-02-26 (6 days ago)
UserGroups: audio cdrom dialout video

[Apport retracing service (apport)]

StacktraceTop:
 __pthread_mutex_lock (mutex=0x0) at pthread_mutex_lock.c:50
 QWaitCondition::wakeAll (this=0xa9c3d1b0) at thread/qwaitcondition_unix.cpp:139
 PreviewGenerator::TeardownAll (this=0xa9c3d198) at previewgenerator.cpp:91
 PreviewGenerator::deleteLater (this=0xa9c3d198) at previewgenerator.cpp:97
 PreviewGeneratorQueue::~PreviewGeneratorQueue (this=0x82fe8d8, __in_chrg=<optimized out>) at previewgeneratorqueue.cpp:57

[MarcRandolph (mrand)]

Howdy, and thank you for helping to improve Mythbuntu by opening this ticket. I've forwarded the important information to the MythTV developers - we'll see what they find!