mythfilldatabase crashed with SIGSEGV in MythContext::ClearSettingsCache()

[Nigel Hathaway]

Binary package hint: mythtv

This happened after canning Freeview channels

ProblemType: Crash
Architecture: i386
Date: Sat Mar 20 15:08:55 2010
DistroRelease: Ubuntu 10.04
ExecutablePath: /usr/bin/mythfilldatabase
InstallationMedia: Mythbuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
Installed_mythplugins-dbg: 0.0
Installed_mythtv-dbg: 0.0
NonfreeKernelModules: nvidia
Package: mythtv-backend 0.23.0~trunk23623-0ubuntu1
ProcCmdline: mythfilldatabase
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_GB.utf8
ProcVersionSignature: Ubuntu 2.6.32-16.25-generic-pae
SegvAnalysis:
 Segfault happened at: 0xb5ca239e <_ZN11MythContext18ClearSettingsCacheERK7QString+30>: mov 0xc8(%eax),%eax
 PC (0xb5ca239e) ok
 source "0xc8(%eax)" (0x0020c008) not located in a known VMA region (needed readable region)!
 destination "%eax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: mythtv
StacktraceTop:
 MythContext::ClearSettingsCache(QString const&) ()
 MythContext::readyRead(MythSocket*) ()
 MythSocketThread::ReadyToBeRead(MythSocket*) ()
 MythSocketThread::run() () from /usr/lib/libmythdb-0.23.so.0
 ?? () from /usr/lib/libQtCore.so.4
Title: mythfilldatabase crashed with SIGSEGV in MythContext::ClearSettingsCache()
Uname: Linux 2.6.32-16-generic-pae i686
UserGroups: adm admin cdrom dialout lpadmin mythtv plugdev sambashare video
XsessionErrors: (polkit-gnome-authentication-agent-1:2371): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed

[Apport retracing service (apport)]

StacktraceTop:
 MythContext::ClearSettingsCache ()
 MythContext::readyRead () from /usr/lib/libmyth-0.23.so.0
 MythSocketThread::ReadyToBeRead ()
 MythSocketThread::run () from /usr/lib/libmythdb-0.23.so.0
 QThreadPrivate::start (arg=0x87b7ec0)

[MarcRandolph (mrand)]

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.

Also, could you please rerun mythtv-setup and make sure you have inputs assigned to capture cards? The following message was in your backend log:

2010-03-20 14:02:17.327 MythBackend, Error: No valid capture cards are defined in the database.
   Perhaps you should re-read the installation instructions?

Lastly, if mythfilldatabase continues to crash, a copy of the mythfilldatabase.log from the run that crashes would be helpful. Only one run, please... more than that, and the log gets unwieldy.

Thanks!