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[Steve Netting <steve@xxxxxxxxxxxxxx>]

I'm seeing identical issues here.  Mythbunu 10.10 installed & latest
updates applied.  System 100% stable for a few days, then yesterday myth
backend starting failing (segfault at 50 ip b46922dc sp bfb94bc0 error 4
in libQtCore.so.4.7.0).

Entries from /var/log/messages:-


Apr 12 10:58:02 myth kernel: [42307.944489] NVRM: os_raise_smp_barrier(), invalid context!
Apr 12 10:58:12 myth kernel: [42318.063773] mythbackend[4207]: segfault at 50 ip b46922dc sp bfb94bc0 error 4 in libQtCore.so.4.7.0[b4636000+290000]
Apr 12 10:58:12 myth kernel: [42318.745247] NVRM: os_raise_smp_barrier(), invalid context!
Apr 12 10:58:12 myth kernel: [42318.762507] NVRM: os_raise_smp_barrier(), invalid context!
Apr 12 10:58:46 myth kernel: [42352.066598] mythbackend[4267]: segfault at 128 ip b466d2dc sp bf905fc0 error 4 in libQtCore.so.4.7.0[b4611000+290000]
Apr 12 10:58:50 myth kernel: [42356.145538] NVRM: os_raise_smp_barrier(), invalid context!

Note: I've been seeing the NVRM errors since the install - but this
didn't cause problems.  Unsure if related?

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https://bugs.launchpad.net/bugs/705077

Title:
  mythbackend will segfault about 10 minutes after starting. "segfault
  at 50 ip 0209d2dc sp bff215c0 error 4 in
  libQtCore.so.4.7.0[2041000+290000]"

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  Invalid

Bug description:
  After performing an apt-get update && apt-get upgrade today (1/19),
  mythbackend is no longer stable. There is no exiting information
  contained in the mythbackend.log file, however there are numerous
  reports of "MainServer, Warning: Unknown socket closing MythSocket"
  and "MainServer, Error: Failed t oopen master server socket, timeout."
  The segfault is recorded in /var/log/messages as follows: "kernel:
  [10921.030926] mythbackend[5755]: segfault at 50 ip 0209d2dc sp
  bff215c0 error 4 in libQtCore.so.4.7.0[2041000+290000]"

  This issue was not present in the earlier package, which I updated to
  earlier this week when I upgraded from 10.04 to 10.10.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: mythtv-backend 2:0.24.0+fixes.20110119.40df4b6-0ubuntu0mythbuntu2
  ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
  Uname: Linux 2.6.35-24-generic i686
  NonfreeKernelModules: nvidia
  Architecture: i386
  CrashDB: mythbuntu
  Date: Wed Jan 19 14:18:35 2011
  InstallationMedia: Mythbuntu 9.10 "Karmic Koala" - Release i386 (20091028.4)
  Installed_mythtv_dbg: 0.0
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: mythtv