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[James Cuzella <TrinitronX@xxxxxxxxx>]

same crash happens often on my system but while it is tuned to a TV
channel (ATSC Digital OTA Antenna) which has bad signal quality.  Crash
happens also when Alt+Tab switching between applications and back to
MythTV when it is still tuned to a frozen TV channel.

Trying to hit Escape to exit TV mode back to main menu usually triggers
the  crash.

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https://bugs.launchpad.net/bugs/1456438

Title:
  mythpreviewgen crashed with SIGSEGV in QMutex::lock()

Status in Mythbuntu:
  New

Bug description:
  After watching a Recording, I exited during the movie credits by
  pressing the 'Esc' button without pausing the Recording. While looking
  through other Recordings, crash occurred.

  ProblemType: Crash
  DistroRelease: Ubuntu 14.04
  Package: mythtv-backend 2:0.27.4+fixes.20150514.6b73976-0ubuntu0mythbuntu4 [origin: LP-PPA-mythbuntu-0.27]
  ProcVersionSignature: Ubuntu 3.16.0-37.51~14.04.1-generic 3.16.7-ckt9
  Uname: Linux 3.16.0-37-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  CrashCounter: 1
  CrashDB: mythbuntu
  Date: Mon May 18 22:03:02 2015
  ExecutablePath: /usr/bin/mythpreviewgen
  InstallationDate: Installed on 2015-03-10 (70 days ago)
  InstallationMedia: Mythbuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  Installed_mythtv_dbg: 2:0.27.4+fixes.20150514.6b73976-0ubuntu0mythbuntu4
  ProcCmdline: mythpreviewgen --size 0x0 --chanid 1082 --starttime 20150517203000 --verbose general --loglevel info --quiet --syslog local7
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   LANG=en_US.UTF-8
  SegvAnalysis:
   Segfault happened at: 0x7f294e6d7346 <_ZN6QMutex4lockEv+6>:	mov    (%rdi),%rbx
   PC (0x7f294e6d7346) ok
   source "(%rdi)" (0x8080808080808110) not located in a known VMA region (needed readable region)!
   destination "%rbx" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: mythtv
  StacktraceTop:
   QMutex::lock() () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
   QMutex::lockInline (this=0x8080808080808110) at /usr/include/qt4/QtCore/qmutex.h:198
   QMutexLocker::QMutexLocker (this=0x7f2927ffec20, m=0x8080808080808110) at /usr/include/qt4/QtCore/qmutex.h:109
   MDBManager::PurgeIdleConnections (this=0x8080808080808110, leaveOne=false) at mythdbcon.cpp:365
   MPoolThread::run (this=0x25f40d0) at mthreadpool.cpp:151
  Title: mythpreviewgen crashed with SIGSEGV in QMutex::lock()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: audio cdrom dialout video

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