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Date: Wed, 18 Sep 2019 11:13:11 -0500
From: "A. Wilcox" <awilfox@...lielinux.org>
To: musl@...ts.openwall.com
Subject: Re: ffmpeg segfault with musl

On 18/09/2019 08:50, Rich Felker wrote:
> On Wed, Sep 18, 2019 at 04:22:06PM +0300, JS wrote:
>> Hello
>>
>> Does anybody have experience/solution with ffmpeg segfaulting with
>> musl? The issue happens when mpd tries to play wav file that is
>> decoded by ffmpeg. Tested with musl 1.1.17 and 1.1.23 and both old
>> and new ffmpeg versions. This does not happen with uClibc on the
>> same hardware.
> 
> I'm not aware of any such problem. Are there publicly available files
> you can reproduce the crash with? Is mpd necessary or does ffplay
> crash too? (easier test case)
> 
> Rich


I'll note here if it helps that I've been *incredibly* rough with ffplay
and other ffmpeg consumers (including Firefox, Audacious, VLC) and I've
never experienced an ffmpeg-related segfault on Adélie, ppc64 + x86_64.

By "rough" I mean "files wrongly encoded by misbehaving programs", in
addition to a wide swath of formats.  I wanted to make sure that there
wouldn't be any issues playing back any media.

I've personally tested WAV (16-bit LE and 8-bit LE), AIFF (BE only),
FLAC, AU (Sun only), MP2, MP3, M4A/AAC, Apple Lossless, Opus, WebM
Audio, and CDDA (audio CDs).

I'd be *very* curious to see an example WAV file as well, if they are
unique in any way; this could even be a security-adjacent bug if there
really is a buffer issue in mpd or ffmpeg.

I'm also interested in what the audio stack looks like.  For example, is
this playing back to the ALSA back-end, Pulse, SDL, socket, sndio?  I
*have* seen a bit of trouble out of the ALSA back end at times, and the
SDL output has been no end of trouble.

Best,
--arw


-- 
A. Wilcox (awilfox)
Project Lead, Adélie Linux
https://www.adelielinux.org



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