mythbackend crashed with SIGSEGV in pthread_mutex_lock()

[Karl Egly]

mythbackend didn't cleanly shutdown in the process of updating it via apt-get from mythbuntu ppa

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: mythtv-backend 2:0.25.0~master.20110911.5b19e55-0ubuntu0mythbuntu2
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CrashDB: mythbuntu
Date: Sun Sep 11 13:14:40 2011
ExecutablePath: /usr/bin/mythbackend
InstallationMedia: Mythbuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
Installed_mythtv_dbg: 2:0.25.0~master.20110911.5b19e55-0ubuntu0mythbuntu2
ProcCmdline: /usr/bin/mythbackend --syslog local7 --user mythtv
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7f38552de394 <pthread_mutex_lock+4>: mov 0x10(%rdi),%esi
 PC (0x7f38552de394) ok
 source "0x10(%rdi)" (0x65007200f60078) not located in a known VMA region (needed readable region)!
 destination "%esi" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: mythtv
StacktraceTop:
 pthread_mutex_lock () from /lib/x86_64-linux-gnu/libpthread.so.0
 QWaitCondition::wakeAll (this=0x7f3844ce0400) at thread/qwaitcondition_unix.cpp:141
 PreviewGenerator::TeardownAll (this=0x7f3844ce03d0) at previewgenerator.cpp:91
 PreviewGenerator::deleteLater (this=0x7f3844ce03d0) at previewgenerator.cpp:97
 PreviewGeneratorQueue::~PreviewGeneratorQueue (this=0x7f38440ce190, __in_chrg=<value optimized out>) at previewgeneratorqueue.cpp:57
Title: mythbackend crashed with SIGSEGV in pthread_mutex_lock()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: audio cdrom dialout video
XsessionErrors:
 (xfwm4:1811): xfwm4-WARNING **: The display does not support the XComposite extension.
 (xfwm4:1811): xfwm4-WARNING **: Compositing manager disabled.
 (nm-applet:1829): libappindicator-WARNING **: Unable to send signal for NewStatus: The connection is closed

[Thomas Mashos (tgm4883)]

We really do appreciate you opening this ticket to help improve Mythbuntu, but it needs to be closed for a number of reasons. The biggest one is that upstream believes this to be fixed in the latest version. Could you please verify if this issue still exists in the latest version?

Please do not let the closing of this ticket dissuade you from opening a new ticket if this (or any other) problem occurs with the newer versions.