xfce4-mixer-plugin crashed with SIGSEGV in free()

[pitwalker]

Binary package hint: xfce4-mixer

I insert a movie DVD (automounted to /media/cdrom0).
I just login to gnome, I start the xfmedia that crash 1 minute before the mixer.
maybe this occureb by same cause with
https://bugs.launchpad.net/bugs/326441
https://bugs.launchpad.net/bugs/328358

(I have problems with kernel (may be sound problem). Every login comes with an oops.)

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/lib/xfce4/panel-plugins/xfce4-mixer-plugin
Package: xfce4-mixer 1:4.5.99.1-0ubuntu1
ProcCmdline: /usr/lib/xfce4/panel-plugins/xfce4-mixer-plugin socket_id 16777272 name xfce4-mixer-plugin id 5 display_name Mixer size 24 screen_position 1
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: xfce4-mixer
StacktraceTop:
 free () from /lib/tls/i686/cmov/libc.so.6
 g_free () from /usr/lib/libglib-2.0.so.0
 ?? ()
 g_cclosure_marshal_VOID__VOID ()
 g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
Title: xfce4-mixer-plugin crashed with SIGSEGV in free()
Uname: Linux 2.6.28-8-generic i686
UserGroups: audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare scanner tape video