Bug#699722: src:libav: x264 decoding crashes

[Reinhard Tartler]

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On Mon, Feb 4, 2013 at 3:12 AM, Dmitry Smirnov <onlyjob at member.fsf.org> wrote:
> Package: src:libav
> Version: 6:9.1-3
> Severity: normal
>
> I still don't have a whole picture but starting with one of the latest libav
> experimental releases "xpra" package started to crash on x264 decoding:

There is no such thing as "x264 decoding", as x264 is an encoder, not
a decoder. The backtrace below indicates that someone (maybe
upstream?) was seriously confused here.

>
>         ======= Backtrace: =========
>         /lib/x86_64-linux-gnu/libc.so.6(+0x76d76)[0x7f22c283bd76]
>         /lib/x86_64-linux-gnu/libc.so.6(cfree+0x6c)[0x7f22c2840aac]
>         /usr/lib/x86_64-linux-gnu/libavutil.so.52(av_freep+0xc)[0x7f22bf0989ac]
>         /usr/lib/x86_64-linux-gnu/libavcodec.so.54(avcodec_get_frame_defaults+0x13)[0x7f22be09ed93]
>         /usr/lib/python2.7/dist-packages/xpra/x264/codec.so(decompress_image+0x61)[0x7f22bee83731]
>         /usr/lib/python2.7/dist-packages/xpra/x264/codec.so(+0x5faa)[0x7f22bee7ffaa]
>         /usr/bin/python(PyEval_EvalFrameEx+0x2de)[0x4ac5ce]
>         /usr/bin/python(PyEval_EvalFrameEx+0xaf0)[0x4acde0]
>

Fortunately, there is no mention of libx264, so a bug in libx264 is unlikely.

Unfortunately, this backtrace is pretty useless. We need a *full*
backtrace as instructed by the following URLs:

http://libav.org/bugreports.html
http://wiki.debian.org/HowToGetABacktrace

-- 
regards,
    Reinhard