Bug#538082: Segmentation fault in avg_pixels8_xy2_altivec()
Christian E. Böhme
monodhs at gmx.de
Wed Jul 22 22:38:28 UTC 2009
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: powerpc (ppc)
Kernel: Linux 22.214.171.124-tibookIV-fbc-xfs+ext2 (PREEMPT)
Locale: LANG=POSIX, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages libavcodec52 depends on:
ii libavutil49 4:0.5+svn20090609-1 ffmpeg utility library
ii libc6 2.9-12 GNU C Library: Shared libraries
ii libfaad0 2.6.1-3.1 freeware Advanced Audio Decoder -
ii libgsm1 1.0.12-1 Shared libraries for GSM speech co
ii libopenjpeg2 1.3+dfsg-4 JPEG 2000 image compression/decomp
ii libschroedinger-1.0- 1.0.7-1 library for encoding/decoding of D
ii libspeex1 1.2~rc1-1 The Speex codec runtime library
ii libtheora0 1.0-2 The Theora Video Compression Codec
ii libvorbis0a 1.2.0.dfsg-5 The Vorbis General Audio Compressi
ii libvorbisenc2 1.2.0.dfsg-5 The Vorbis General Audio Compressi
ii zlib1g 1:126.96.36.199.dfsg-13 compression library - runtime
libavcodec52 recommends no packages.
libavcodec52 suggests no packages.
-- no debconf information
Running any of the various video playback programs such as vlc or gxine
(I happen to use the latter) has them crash due to invalid memory access(es)
from within the /usr/lib/altivec/libavcodec.so.52 du jour.
As an example, open and play the video file that is available via the
attached torrent (these are the only files that cause the errors, BTW).
Executing gxine from withing gdb, in particular, yields the following
lines at a crash:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x35a51480 (LWP 2996)]
0x0e07a8b4 in avg_pixels8_altivec () from /usr/lib/altivec/libavcodec.so.52
The behaviour is reproducible in that it causes a crash but varies in the
time it takes for the seg fault to occur (usually within the fist two to three
minutes, occasionally longer) unless a fast forward or backward (via the
progress bar slider simultaneously acting as a random access control)
is attempted in which case the program bombs immediately.
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