Package: mt-daapd
Version: 0.9~r1696.dfsg-13
Severity: normal
I can transcode .flac files perfectly well, but as soon as a .ogg file is
played, the server crashes out. If run with the '-f' switch, it prints
'Segmentation fault'.
Running under gdb, it seems to crash inside libavcodec.so.52, but the stack
trace isn't useful. I couldn't get a full core dump yet (despite 'ulimit -c
unlimited').
---- from gdb ----
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb59d5b90 (LWP 15826)]
0xb79c6b55 in ?? () from /usr/lib/i686/cmov/libavcodec.so.52
(gdb) bt
#0 0xb79c6b55 in ?? () from /usr/lib/i686/cmov/libavcodec.so.52
#1 0x080b5450 in ?? ()
#2 0xb59d44d0 in ?? ()
#3 0xb79356fe in ?? () from /usr/lib/i686/cmov/libavcodec.so.52
#4 0xb518e064 in ?? ()
#5 0xb59d44d0 in ?? ()
#6 0x00000400 in ?? ()
#7 0x00000002 in ?? ()
#8 0x082ed9e0 in ?? ()
#9 0x082ee9e0 in ?? ()
#10 0x081d6370 in ?? ()
#11 0xb763cd80 in av_new_packet () from /usr/lib/i686/cmov/libavcodec.so.52
#12 0x00000009 in ?? ()
#13 0xb59d4518 in ?? ()
#14 0xb59d4514 in ?? ()
#15 0xb7559b2d in ?? () from /usr/lib/i686/cmov/libavformat.so.52
#16 0x081d6370 in ?? ()
#17 0x00000001 in ?? ()
#18 0x00000400 in ?? ()
#19 0x081cbd30 in ?? ()
#20 0x00000001 in ?? ()
#21 0xb59d45b8 in ?? ()
#22 0x081d6370 in ?? ()
#23 0xb769c4ba in avcodec_decode_audio2 () from
/usr/lib/i686/cmov/libavcodec.so.52
Cannot access memory at address 0xffffeffc
(gdb) disass 0xb79c6b45 0xb79c6b65
Dump of assembler code from 0xb79c6b45 to 0xb79c6b65:
0xb79c6b45: cvtps2dq (%eax,%ecx,1),%xmm1
0xb79c6b4a: packssdw %xmm1,%xmm0
0xb79c6b4e: movhlps %xmm0,%xmm1
0xb79c6b51: punpcklwd %xmm1,%xmm0
0xb79c6b55: movdqa %xmm0,(%ebx,%ecx,1)
0xb79c6b5a: add $0x10,%ecx
0xb79c6b5d: js 0xb79c6b40
0xb79c6b5f: mov (%esp),%ebx
0xb79c6b62: mov 0x4(%esp),%esi
(gdb) info registers
eax 0x82ef9e0 137296352
ecx 0xfffff000 -4096
edx 0xb59d44d0 -1247984432
ebx 0xb518f064 -1256656796
...
xmm0 {v4_float = {0x0, 0x0, 0x0, 0x0}, ...
---- 8< ----
ebx isn't 16 byte aligned, so it is probably getting an alignment exception
on the movdqa, which needs to be aligned.
As to whether it's a problem with libavcodec internally, or mt-daapd for
sending down an unaligned buffer, I don't know.
Rather bizarrely the executable seems to be linked to both libavutil.so.49 and
libavutil.so.50, though this is probably an irrelevance.
---- extract from ldd /usr/sbin/mt-daapd ----
...
libogg.so.0 => /usr/lib/libogg.so.0 (0xb7ec0000)
libvorbis.so.0 => /usr/lib/libvorbis.so.0 (0xb7e96000)
libvorbisfile.so.3 => /usr/lib/libvorbisfile.so.3 (0xb7e8e000)
libFLAC.so.8 => /usr/lib/libFLAC.so.8 (0xb7e3b000)
libavcodec.so.52 => /usr/lib/i686/cmov/libavcodec.so.52 (0xb753f000)
libavformat.so.52 => /usr/lib/i686/cmov/libavformat.so.52 (0xb743d000)
libavutil.so.49 => /usr/lib/i686/cmov/libavutil.so.49 (0xb742b000)
...
libm.so.6 => /lib/i686/cmov/libm.so.6 (0xb7268000)
libavutil.so.50 => /usr/lib/i686/cmov/libavutil.so.50 (0xb7256000)
libamrnb.so.3 => /usr/lib/libamrnb.so.3 (0xb7219000)
...
---- 8< ----
-- System Information:
Debian Release: squeeze/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 2.6.27.9 (SMP w/2 CPU cores; PREEMPT)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash
Versions of packages mt-daapd depends on:
ii adduser 3.110 add and remove users and groups
ii avahi-daemon 0.6.25-1 Avahi mDNS/DNS-SD daemon
ii libavahi-client3 0.6.25-1 Avahi client library
ii libavahi-common3 0.6.25-1 Avahi common library
ii libavcodec52 5:0.5+svn20090612-0.1 library to encode decode multimedi
ii libavformat52 5:0.5+svn20090612-0.1 ffmpeg file format library
ii libavutil49 4:0.5+svn20090420-2 ffmpeg utility library
ii libc6 2.9-12 GNU C Library: Shared libraries
ii libflac8 1.2.1-1.2 Free Lossless Audio Codec - runtim
ii libid3tag0 0.15.1b-10 ID3 tag reading library from the M
ii libjs-prototype 1.6.0.3-1 JavaScript Framework for dynamic w
ii libjs-scriptaculou 1.8.2-1 JavaScript library for dynamic web
ii libogg0 1.1.3-5 Ogg Bitstream Library
ii libsqlite3-0 3.6.14.2-1 SQLite 3 shared library
ii libtagc0 1.5-6 TagLib Audio Meta-Data Library (C
ii libvorbis0a 1.2.0.dfsg-5 The Vorbis General Audio Compressi
ii libvorbisfile3 1.2.0.dfsg-5 The Vorbis General Audio Compressi
ii zlib1g 1:1.2.3.3.dfsg-13 compression library - runtime
mt-daapd recommends no packages.
mt-daapd suggests no packages.
-- no debconf information
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