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[Karl Dietz <846953@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/846953

Title:
  mythbackend crashed with SIGSEGV in pthread_mutex_lock()

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  New

Bug description:
  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

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