Segfault when computing MD5

[ahthovaikied]

I am getting a segfault when computing MD5, with a build from git master (commit fd2bcfc4d6967588168443849b9bc365c78bb9af).

Sample file is available here : ​http://www.auby.no/files/video_tests/h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv (4.3M)

$ gdb --args ./ffmpeg -i h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv -f md5 -GNU gdb (Ubuntu 7.7-0ubuntu3) 7.7
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Reading symbols from ./ffmpeg...(no debugging symbols found)...done.
(gdb) run
Starting program: /tmp/ffmpeg/ffmpeg -i h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv -f md5 -
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
ffmpeg version N-62058-gfd2bcfc Copyright (c) 2000-2014 the FFmpeg developers
  built on Apr  3 2014 13:21:04 with gcc 4.8 (Ubuntu 4.8.2-17ubuntu2)
  configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --enable-debug --cpu=core-avx-i
  WARNING: library configuration mismatch
  avutil      configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  avcodec     configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  avformat    configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  avdevice    configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  avfilter    configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  swscale     configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  swresample  configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  postproc    configuration: --enable-gpl --enable-version3 --enable-nonfree --disable-static --enable-shared --disable-runtime-cpudetect --disable-ffserver --disable-encoder=vorbis --disable-encoder=aac --enable-x11grab --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopus --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid --disable-debug --cpu=core-avx-i
  libavutil      52. 71.100 / 52. 66.100
  libavcodec     55. 56.107 / 55. 52.102
  libavformat    55. 36.101 / 55. 33.100
  libavdevice    55. 11.100 / 55. 10.100
  libavfilter     4.  3.100 /  4.  2.100
  libswscale      2.  6.100 /  2.  5.102
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, matroska,webm, from 'h264_720p_hp_3.1_600kbps_aac_mp3_dual_audio_harry_potter.mkv':
  Metadata:
    title           : Harry Potter 4[Eng-Hindi]Dual.Audio BRRIP 720p-=[champ_is_here]=-
    encoder         : libebml v1.0.0 + libmatroska v1.0.0
    creation_time   : 2011-01-07 07:42:53
  Duration: 00:00:57.61, start: 0.000000, bitrate: 613 kb/s
    Stream #0:0(eng): Video: h264 (High), yuv420p, 1280x528 [SAR 1:1 DAR 80:33], 25 fps, 25 tbr, 1k tbn, 47.95 tbc
    Metadata:
      title           : -=[champ_is_here]=-
    Stream #0:1(eng): Audio: aac, 48000 Hz, stereo, fltp
    Metadata:
      title           : -=[champ_is_here]=-
    Stream #0:2(hin): Audio: mp3, 48000 Hz, stereo, s16p, 160 kb/s
    Metadata:
      title           : -=[champ_is_here]=-
[New Thread 0x7fffed725700 (LWP 6455)]
[New Thread 0x7fffecf24700 (LWP 6456)]
[New Thread 0x7fffec723700 (LWP 6457)]
[New Thread 0x7fffebf22700 (LWP 6458)]
[New Thread 0x7fffeb721700 (LWP 6459)]
[New Thread 0x7fffeaf20700 (LWP 6460)]
[New Thread 0x7fffea71f700 (LWP 6461)]
[New Thread 0x7fffe9f1e700 (LWP 6462)]
[New Thread 0x7fffe971d700 (LWP 6463)]
[New Thread 0x7fffe8f1c700 (LWP 6464)]
[New Thread 0x7fffe871b700 (LWP 6465)]
[New Thread 0x7fffe7f1a700 (LWP 6466)]
[New Thread 0x7fffe7719700 (LWP 6467)]
[New Thread 0x7fffe6f18700 (LWP 6468)]
[New Thread 0x7fffe6717700 (LWP 6469)]
Output #0, md5, to 'pipe:':
  Metadata:
    title           : Harry Potter 4[Eng-Hindi]Dual.Audio BRRIP 720p-=[champ_is_here]=-
    encoder         : Lavf55.33.100
    Stream #0:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p, 1280x528 [SAR 1:1 DAR 80:33], q=2-31, 200 kb/s, 90k tbn, 25 tbc
    Metadata:
      title           : -=[champ_is_here]=-
    Stream #0:1(eng): Audio: pcm_s16le, 48000 Hz, stereo, s16, 1536 kb/s
    Metadata:
      title           : -=[champ_is_here]=-
Stream mapping:
  Stream #0:0 -> #0:0 (h264 -> rawvideo)
  Stream #0:1 -> #0:1 (aac -> pcm_s16le)
Press [q] to stop, [?] for help

Program received signal SIGSEGV, Segmentation fault.
0x0000000000408b37 in ?? ()
(gdb) bt
#0  0x0000000000408b37 in ?? ()
#1  0x00007ffff4db2ec5 in __libc_start_main (main=0x406fd0, argc=6, argv=0x7fffffffdf28, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>,
    stack_end=0x7fffffffdf18) at libc-start.c:287
#2  0x0000000000409c31 in ?? ()

I have another PC with a build from the same source, but with different CPU and compiler that works fine. See bug ​https://trac.ffmpeg.org/ticket/3524 for context.

[Carl Eugen Hoyos]

Replying to ahthovaikied:

WARNING: library configuration mismatch

This means that your binary is broken and you cannot report a crash.
(There may indeed be a bug but you would have to point to the commit that introduces it.)

Please either:

• compile without --disable-static --enable-shared (after running make distclean)
• or set LD_LIBRARY_PATH to your build directory.

[gjdfgh]

This means that your binary is broken and you cannot report a crash.

This is wrong. Ever heard of ABI compatibility?

[Carl Eugen Hoyos]

Replying to gjdfgh:

This means that your binary is broken and you cannot report a crash.

This is wrong. Ever heard of ABI compatibility?

As in: Replacing current libraries with older versions?

[gjdfgh]

In any case, the libraries should check for incompatible configurations.

Why are you closing this? A crash is a serious issue.

[Carl Eugen Hoyos]

Replying to gjdfgh:

In any case, the libraries should check for incompatible configurations.

But this is not what this ticket is about (and I don't think we would make anybody happy by being more strict than necessary for testing).

Why are you closing this? A crash is a serious issue.

Because I can crash any dynamically linked ffmpeg binary by switching libraries against older versions.

[ahthovaikied]

I confirm, without --disable-static --enable-shared, the crash is gone.