empathy-av crashed with SIGSEGV in pthread_mutex_lock()

[A. Bram Neijt]

Binary package hint: empathy

After stopping and then starting the Video feed using Google Talk with another Empathy client.

To reproduce:
1. Start an audio chat
2. After connecting, turn on Video support
3. Turn off Video support
4. Turn on Video support

The result:
A crash of the call. Empathy luckily survives.

ProblemType: Crash
DistroRelease: Ubuntu 10.10
Package: empathy 2.31.92-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: c61c47905a08381ec5d89e05cd06d034
CheckboxSystem: d00f84de8a555815fa1c4660280da308
CrashCounter: 1
Date: Mon Sep 27 20:34:02 2010
ExecutablePath: /usr/lib/empathy/empathy-av
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta amd64 (20100901.1)
ProcCmdline: /usr/lib/empathy/empathy-av
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.utf8
SegvAnalysis:
 Segfault happened at: 0x7fece3a6e634 <pthread_mutex_lock+4>: mov 0x10(%rdi),%esi
 PC (0x7fece3a6e634) ok
 source "0x10(%rdi)" (0xaaaaaaaaaaaaac22) not located in a known VMA region (needed readable region)!
 destination "%esi" ok
 Stack memory exhausted (SP below stack segment)
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: empathy
StacktraceTop:
 pthread_mutex_lock () from /lib/libpthread.so.0
 g_static_rw_lock_reader_lock () from /lib/libglib-2.0.so.0
 ?? () from /usr/lib/gstreamer-0.10/libfsrtpconference.so
 ?? () from /usr/lib/gstreamer-0.10/libfsrtpconference.so
 ?? () from /usr/lib/libgstreamer-0.10.so.0
Title: empathy-av crashed with SIGSEGV in pthread_mutex_lock()
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (polkit-gnome-authentication-agent-1:1768): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (Do:1775): Wnck-CRITICAL **: wnck_set_client_type got called multiple times.
 (nautilus:1779): Gtk-WARNING **: Refusing to add non-unique action 'NautilusOpenTerminal::open_terminal' to action group 'ExtensionsMenuGroup'

[Apport retracing service (apport)]

StacktraceTop:
 pthread_mutex_lock () from /lib/libpthread.so.0
 g_static_rw_lock_reader_lock (
 fs_rtp_session_has_disposed_enter (self=0x184c480,
 _discovery_pad_blocked_callback (pad=0x1d926b0,
 handle_pad_block (pad=0x1d926b0) at gstpad.c:3986

[Omer Akram (om26er)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. Please try to obtain a backtrace following the instructions at http://wiki.ubuntu.com/DebuggingProgramCrash and upload the backtrace (as an attachment) to the bug report. This will greatly help us in tracking down your problem

[A. Bram Neijt (bneijt)]

I was not able to reproduce this bug with the latest versions in maverick.