mythbackend crashed with SIGSEGV in ref()

[Karl Egly]

This seems to have happened while shutting down the backend service to restart it.

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: mythtv-backend 2:0.25.0~master.20110910.bc9837f-0ubuntu0mythbuntu2
ProcVersionSignature: Ubuntu 2.6.38-10.46-generic 2.6.38.7
Uname: Linux 2.6.38-10-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CrashCounter: 1
CrashDB: mythbuntu
Date: Sat Sep 10 10:15:27 2011
ExecutablePath: /usr/bin/mythbackend
InstallationMedia: Mythbuntu 11.04 "Natty Narwhal" - Release amd64 (20110426)
Installed_mythtv_dbg: 2:0.25.0~master.20110910.bc9837f-0ubuntu0mythbuntu2
ProcCmdline: /usr/bin/mythbackend --syslog local7 --user mythtv
ProcEnviron:
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
SegvAnalysis:
 Segfault happened at: 0x7fadd037db08 <QMap<int, runningjobinfo>::detach_helper()+136>: lock incl (%rax)
 PC (0x7fadd037db08) ok
 source "(%rax)" (0x00000024) not located in a known VMA region (needed readable region)!
 Stack memory exhausted (SP below stack segment)
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: mythtv
StacktraceTop:
 ref (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qatomic_x86_64.h:121
 QString (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qstring.h:729
 runningjobinfo (this=0x7fadb802a0a0) at jobqueue.h:105
 node_create (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qmap.h:455
 QMap<int, runningjobinfo>::detach_helper (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qmap.h:760
Title: mythbackend crashed with SIGSEGV in ref()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: audio cdrom dialout video
XsessionErrors:
 (xfwm4:1811): xfwm4-WARNING **: The display does not support the XComposite extension.
 (xfwm4:1811): xfwm4-WARNING **: Compositing manager disabled.
 (nm-applet:1829): libappindicator-WARNING **: Unable to send signal for NewStatus: The connection is closed

[Karl Egly (dekarl)]

StacktraceTop:
 ref (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qatomic_x86_64.h:121
 QString (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qstring.h:729
 runningjobinfo (this=0x7fadb802a0a0) at jobqueue.h:105
 node_create (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qmap.h:455
 QMap<int, runningjobinfo>::detach_helper (this=0x7fadb802a0a0) at /usr/include/qt4/QtCore/qmap.h:760

[Thomas Mashos (tgm4883)]

We really do appreciate you opening this ticket to help improve Mythbuntu, but it needs to be closed for a number of reasons. The biggest one is that upstream believes this to be fixed in the latest version. Could you please verify if this issue still exists in the latest version?

Please do not let the closing of this ticket dissuade you from opening a new ticket if this (or any other) problem occurs with the newer versions.