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[Karl Dietz <846383@xxxxxxxxxxxxxxxxxx>]

** Attachment added: "Stacktrace.txt"
   https://bugs.launchpad.net/bugs/846383/+attachment/2384490/+files/Stacktrace.txt

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Title:
  mythbackend crashed with SIGSEGV in ref()

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  New

Bug description:
  This seems to have happened while shutting down the backend service to
  restart it.

  ProblemType: Crash
  DistroRelease: Ubuntu 11.04
  Package: mythtv-backend 2:0.25.0~master.20110910.bc9837f-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
  CrashCounter: 1
  CrashDB: mythbuntu
  Date: Sat Sep 10 10:15:27 2011
  ExecutablePath: /usr/bin/mythbackend
  InstallationMedia: Mythbuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
  Installed_mythtv_dbg: 2:0.25.0~master.20110910.bc9837f-0ubuntu0mythbuntu2
  ProcCmdline: /usr/bin/mythbackend --syslog local7 --user mythtv
  ProcEnviron:
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
  SegvAnalysis:
   Segfault happened at: 0x7fadd037db08 <QMap<int, runningjobinfo>::detach_helper()+136>:	lock incl (%rax)
   PC (0x7fadd037db08) ok
   source "(%rax)" (0x00000024) not located in a known VMA region (needed readable region)!
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: mythtv
  StacktraceTop:
   ref (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qatomic_x86_64.h:121
   QString (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qstring.h:729
   runningjobinfo (this=0x7fadb802a0a0) at jobqueue.h:105
   node_create (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qmap.h:455
   QMap<int, runningjobinfo>::detach_helper (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qmap.h:760
  Title: mythbackend crashed with SIGSEGV in ref()
  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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