[Ffmpeg-devel] random crashes decoding MP3s

[Jacob Meuser]

On Fri, Mar 31, 2006 at 10:13:24PM +0100, M?ns Rullg?rd wrote:
> Jacob Meuser <jakemsr at jakemsr.com> writes:
> 
> > On Fri, Mar 31, 2006 at 11:33:09AM -0800, Jacob Meuser wrote:
> >> On Fri, Mar 31, 2006 at 08:28:12PM +0100, M?ns Rullg?rd wrote:
> >> > Jacob Meuser <jakemsr at jakemsr.com> writes:
> >> > 
> >> > > hola,
> >> > >
> >> > > I'm seeing occasional random crashes decoding VBR MP3s to WAV, ie:
> >> > >
> >> > > $ ffmpeg file_vbr.mp3 file.wav
> >> > >
> >> > > this is from FFmpeg CVS as of about 9 hours ago on OpenBSD
> >> > > -current.  I also see the crashes with FFmpeg CVS from 03/21/06.
> >> > [...]
> >> > > what seems most strange is that the crashes are random.  often
> >> > > just running the process a second time works.  I'm decoding several
> >> > > MP3 files.  ffmpeg crashes about 20% of the time.  the backtrace
> >> > > looks very similar every time (ie, huffman_decode() is always #0).
> >> > 
> >> > This could be bad memory.  Do you have any other random crashes, like
> >> > GCC segfaulting or so?  Run a memory checker like memtest86, and check
> >> > your cabling.
> >> 
> >> hmmm.  I haven't seen anything else go wonky, but of course sh*t
> >> happens when you least expect it (and can least afford it :().
> >> 
> >> I'll try memtest86 and report back in a while.
> >
> > I only let it go for 1.2 passes but no errors.
> >
> > I realized I had always been building FFmpeg with CFLAGS+=-g, so I
> > tried without.  still crashed in huffman_decode(), but I got through
> > a lot more files before it happened.
> 
> FFmpeg is built with -g by default to that shouldn't make a
> difference.

I took it out, just out of curiousity.

> > also, the crashes do not happen with FFmpeg CVS from 04/13/2005.
> 
> Make sure you have a clean build of ffmpeg (make clean; make).

yes, of course.  I actually made a tarball of the sources and blow
away/reextract each time I build.

> Does this happen with all files?  If not, upload a sample somewhere.

well, it's random.  I'm getting the MP3s from the Live Music Archive,
http://www.archive.org/audio/etree.php.

some example files:

http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t01_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t02_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t03_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t04_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t05_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t06_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t07_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t08_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t09_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t10_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d1t11_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d2t01_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d2t02_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d2t03_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d3t01_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d3t02_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d3t03_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d3t04_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d3t05_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d3t06_vbr.mp3
http://www.archive.org/download/gd78-04-14.sbd.clugston.7251.sbefail.shnf/gd78-04-14d3t07_vbr.mp3


-- 
<jakemsr at jakemsr.com>