Crash (SIGSEGV) in memcpy using libfaad2

[Christopher Bowman]

While listening to m4a files that were pulled from my iTunes collection, beep will crash randomly. This is probably not a bug in beep, but that's where I see the crash. Below is a backtrace:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1274565712 (LWP 21696)]
0xb7616505 in mempcpy () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0 0xb7616505 in mempcpy () from /lib/tls/i686/cmov/libc.so.6
#1 0xb760a69a in _IO_file_xsputn () from /lib/tls/i686/cmov/libc.so.6
#2 0xb760b578 in _IO_sgetn () from /lib/tls/i686/cmov/libc.so.6
#3 0xb75ff699 in fread () from /lib/tls/i686/cmov/libc.so.6
#4 0xb68c4861 in read_callback () from /usr/lib/bmp/Input/libmp4.so
#5 0xb684034f in mp4ff_read_data () from /usr/lib/libmp4ff.so.0
#6 0xb683db6f in mp4ff_read_sample () from /usr/lib/libmp4ff.so.0
#7 0xb68c40b9 in mp4_get_file_type () from /usr/lib/bmp/Input/libmp4.so
#8 0xb77fc341 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#9 0xb76744ee in clone () from /lib/tls/i686/cmov/libc.so.6

Versions:
beep-media-player 0.9.7.1+cvs20050803-1ubuntu2
bmp-mp4 2.0.0+cvs20040908+mp4v2+bmp-0ubuntu3
libfaad2-0 2.0.0+cvs20040908+mp4v2+bmp-0ubuntu3
libc6-i686 2.3.6-0ubuntu17

[Luca Falavigna (dktrkranz)]

Thank you for your bug report.
Could you please generate a backtrace of it? You may follow this procedure: https://wiki.ubuntu.com/DebuggingProgramCrash.
Thank you.

[Christopher Bowman (cbowman)]

Attached is a backtrace per the instructions in the wiki.

I'm running Valgrind now and will upload it after another crash.

[Christopher Bowman (cbowman)]

Attached is Valgrind output.

[Luca Falavigna (dktrkranz)]

I filed a new bug in DBT and in SF.net bugtracker (http://sourceforge.net/tracker/index.php?func=detail&aid=1567145&group_id=95272&atid=610824).
BMP Bugzilla, located at http://www.sosdg.org/~larne/bugs, is not available at the moment, I will try later on.

[Christopher Bowman (cbowman)]

Thanks. I recompiled the faad2 with debugging and captured another backtrace that has more debugging information.

The Debug: lines in the previous backtrace were probably caused by my attempt at debugging this months ago.

I'll try to reproduce this with xmms, since I believe the issue isn't exclusive to bmp.

[Christopher Bowman (cbowman)]

xmms backtrace.

faad2 is a common link, so maybe this should go there.

[Luca Falavigna (dktrkranz)]

I'm trying to reproduce the bug, which seems related to libfaad2 rather than beep-media-player.

[Christopher Bowman (cbowman)]

Possibly useful information:

The crash seems to always occur at the end of a song and before the next song has started.

The size of the playlist doesn't seem to matter.

All files in the playlist are m4a.

This occurs on more than one machine, so I don't think it's a problem with this hardware and the m4a files play correctly when using mplayer.

[Luca Falavigna (dktrkranz)]

I downloaded some samples and I noticed a message "mp4: stream error" when reaching the end of the song, but program (XMMS actually) didn't crash. I will keep watching it anyway.

[Luca Falavigna (dktrkranz)]

mplayer didn't crash because it doesn't use libfaad2, which seems responsible for this issue.

[Luca Falavigna (dktrkranz)]

I obtained a backtrace using beep-media-player.

[Luca Falavigna (dktrkranz)]

I obtained a backtrace using XMMS too.
Now I'm able to confim this bug. Affected package seems faad2, so I'm going to change source package related to this bug.

[Luca Falavigna (dktrkranz)]

I closed debian and bmp bug reports.
I also filed a new bug in faad2 bugtrack. See http://sourceforge.net/tracker/index.php?func=detail&aid=1568321&group_id=704&atid=100704 for more info.

[Luca Falavigna (dktrkranz)]

Attached debdiff should fix this.

[Luca Falavigna (dktrkranz)]

A new debdiff is needed: https://lists.ubuntu.com/archives/gutsy-changes/2007-June/002986.html.

[Luca Falavigna (dktrkranz)]

Debdiff updated.

[Lionel Porcheron (lionel.porcheron)]

Format: 1.7
Date: Tue, 12 Jun 2007 13:17:39 +0200
Source: faad2
Binary: libfaad2-0 bmp-mp4 xmms-mp4 libmp4v2-dev libmp4v2-0 libfaad2-dev faad
Architecture: source
Version: 2.0.0+cvs20040908+mp4v2+bmp-0ubuntu5
Distribution: gutsy
Urgency: low
Maintainer: Ubuntu MOTU Developers <email address hidden>
Changed-By: Luca Falavigna <email address hidden>
Description:
 bmp-mp4 - a mp4/aac audio player for bmp
 faad - freeware Advanced Audio Decoder player
 libfaad2-0 - freeware Advanced Audio Decoder - runtime files
 libfaad2-dev - freeware Advanced Audio Decoder - development files
 libmp4v2-0 - MP4 container library - runtime files
 libmp4v2-dev - MP4 container library - development files
 xmms-mp4 - a mp4/aac audio player for xmms
Changes:
 faad2 (2.0.0+cvs20040908+mp4v2+bmp-0ubuntu5) gutsy; urgency=low
 .
   * 10_libmp4_sample_check.diff: fixed SIGSEGV while listening to m4a
     files (LP: 40043)
   * Update Maintainer field in debian/control
Files:
 045463b8f35b5bf749ca16d9cb40f288 851 libs optional faad2_2.0.0+cvs20040908+mp4v2+bmp-0ubuntu5.dsc
 42cc5ca6f05156e7539f41825d920aab 5947 libs optional faad2_2.0.0+cvs20040908+mp4v2+bmp-0ubuntu5.diff.gz
Original-Maintainer: Sebastian Droege <email address hidden>

[Luca Falavigna (dktrkranz)]

Package built. Thank you.