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[H Buus <mythtv@xxxxxxxxx>]

I believe this is caused by a bug in nzmqt. It has been reported here:
https://github.com/jonnydee/nzmqt/issues/8
Several tickets have been filed against mythtv that appear to have this same root cause:
http://code.mythtv.org/trac/ticket/10924
http://code.mythtv.org/trac/ticket/11043
http://code.mythtv.org/trac/ticket/11360
as well as the mythtv ticket that links to this launchpad bug:
http://code.mythtv.org/trac/ticket/11378

** Bug watch added: code.mythtv.org/trac/ #10924
   http://code.mythtv.org/trac/ticket/10924

** Bug watch added: code.mythtv.org/trac/ #11043
   http://code.mythtv.org/trac/ticket/11043

** Bug watch added: code.mythtv.org/trac/ #11378
   http://code.mythtv.org/trac/ticket/11378

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https://bugs.launchpad.net/bugs/1101395

Title:
  mythlogserver crashed with SIGSEGV in QObject::disconnect()

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  Triaged
Status in MythTV:
  Unknown
Status in “mythtv” package in Ubuntu:
  Triaged

Bug description:
  crashed on remote frontend

  ProblemType: Crash
  DistroRelease: Ubuntu 12.04
  Package: mythtv-common 2:0.26.0+fixes.20130118.8f8274a-0ubuntu0mythbuntu2 [origin: LP-PPA-mythbuntu-0.26]
  ProcVersionSignature: Ubuntu 3.2.0-35.55-generic 3.2.34
  Uname: Linux 3.2.0-35-generic x86_64
  NonfreeKernelModules: nvidia
  .var.log.mythtv.mythavtest.log:
   
  .var.log.mythtv.mythbackend.log:
   
  .var.log.mythtv.mythccextractor.log:
   
  .var.log.mythtv.mythcommflag.log:
   
  .var.log.mythtv.mythfilldatabase.log:
   
  .var.log.mythtv.mythjobqueue.log:
   
  .var.log.mythtv.mythlcdserver.log:
   
  .var.log.mythtv.mythmediaserver.log:
   
  .var.log.mythtv.mythmetadatalookup.log:
   
  .var.log.mythtv.mythpreviewgen.log:
   
  .var.log.mythtv.mythshutdown.log:
   
  .var.log.mythtv.mythtranscode.log:
   
  .var.log.mythtv.mythtv.setup.log:
   
  .var.log.mythtv.mythutil.log:
   
  .var.log.mythtv.mythwelcome.log:
   
  ApportVersion: 2.0.1-0ubuntu17.1
  Architecture: amd64
  CrashDB: mythbuntu
  Date: Fri Jan 18 15:13:07 2013
  Disassembly: => 0x0:	Cannot access memory at address 0x0
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-precise-amd64-20120703-2
  ExecutablePath: /usr/bin/mythlogserver
  InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20120703-15:08
  Installed_mythtv_dbg: 2:0.26.0+fixes.20130118.8f8274a-0ubuntu0mythbuntu2
  MarkForUpload: True
  MythTVDirectoryPermissions:
   total 4
   drwxr-xr-x 2 root root 4096 Nov 24 18:26 videos
  ProcCmdline: /usr/bin/mythlogserver --daemon --verbose general --loglevel info --syslog local7
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SegvAnalysis:
   Segfault happened at: 0x0:	Cannot access memory at address 0x0
   PC (0x00000000) not located in a known VMA region (needed executable region)!
   Stack memory exhausted (SP below stack segment)
  SegvReason: executing NULL VMA
  Signal: 11
  SourcePackage: mythtv
  StacktraceTop:
   ?? ()
   QObject::disconnect(QObject const*, char const*, QObject const*, char const*) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
   disconnect (member=0x0, receiver=0x7ff2d800b560, this=0x7ff2e000b4c0) at /usr/include/qt4/QtCore/qobject.h:252
   unregisterSocket (socket_=0x7ff2e000b4c0, this=0x7ff2d800b560) at ../include/nzmqt/nzmqt.hpp:703
   nzmqt::PollingZMQContext::qt_static_metacall (_o=0x7ff2d800b560, _c=<optimized out>, _id=<optimized out>, _a=<optimized out>) at moc_nzmqt.cpp:401
  Title: mythlogserver crashed with SIGSEGV in QObject::disconnect()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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