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[MarcRandolph <mrand@xxxxxxxxx>]

Thank you for helping to improve Mythbuntu by opening this ticket. Unfortunately, this backtrace attached is not useful to the
developers. Could you please follow the "basic backtrace" directions outlined here:

http://www.mythtv.org/wiki/Debugging#Debugging_with_Ubuntu_packages
The above process should result in a new ticket being opened, so I'm going to close this one.

** Changed in: mythtv (Ubuntu)
   Importance: Undecided => High

** Changed in: mythtv (Ubuntu)
       Status: New => Invalid

-- 
mythfrontend.real crashed with SIGSEGV in QMutex::lock()
https://bugs.launchpad.net/bugs/542787
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Status in “mythtv” package in Ubuntu: Invalid

Bug description:
Binary package hint: mythtv

When trying to play any recorded programs, mythfrontend crashes.

Using the nvidia driver 195.36.15.  Worked fine on Karmic before upgrading to Lucid.

ProblemType: Crash
Architecture: amd64
CrashCounter: 1
Date: Sat Mar 20 13:00:14 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/mythfrontend.real
Installed_mythplugins-dbg: 0.0
Installed_mythtv-dbg: 0.0
NonfreeKernelModules: nvidia
Package: mythtv-frontend 0.23.0~trunk23623-0ubuntu1
ProcCmdline: /usr/bin/mythfrontend.real -v playback
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_CA.UTF-8
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic
SegvAnalysis:
 Segfault happened at: 0x7fb6120b78dc <_ZN6QMutex4lockEv+12>:	cmpb   $0x0,(%rdx)
 PC (0x7fb6120b78dc) ok
 source "$0x0" ok
 destination "(%rdx)" (0x00000001) not located in a known VMA region (needed writable region)!
SegvReason: writing NULL VMA
Signal: 11
SourcePackage: mythtv
StacktraceTop:
 QMutex::lock() () from /usr/lib/libQtCore.so.4
 NuppelDecoder::NuppelDecoder(NuppelVideoPlayer*, ProgramInfo const&) () from /usr/lib/libmythtv-0.23.so.0
 NuppelVideoPlayer::OpenFile(bool, unsigned int, bool) () from /usr/lib/libmythtv-0.23.so.0
 PlayerContext::CreateNVP(TV*, QWidget*, TVState, unsigned long, QRect const*, bool) () from /usr/lib/libmythtv-0.23.so.0
 TV::StartPlayer(PlayerContext*, PlayerContext*, TVState) () from /usr/lib/libmythtv-0.23.so.0
Title: mythfrontend.real crashed with SIGSEGV in QMutex::lock()
Uname: Linux 2.6.32-16-generic x86_64
UserGroups: audio cdrom floppy fuse games mythtv plugdev video
XsessionErrors:
 (polkit-gnome-authentication-agent-1:3900): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-terminal:4373): Gtk-CRITICAL **: gtk_accel_map_unlock_path: assertion `entry != NULL && entry->lock_count > 0' failed
 (gnome-terminal:8485): Gtk-CRITICAL **: gtk_accel_map_unlock_path: assertion `entry != NULL && entry->lock_count > 0' failed