Further information:

I have now repeated the crash with packages installed only from the main squeeze archives.

The dependency list is now:

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         4:0.5+svn20090420-2 ffmpeg codec library
ii  libavformat52        4:0.5+svn20090420-2 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-scriptaculous  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

(I managed to install from my d/l cache using dpkg, even though apt wouldn't do it)

The gdb information from the latest crash is:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb5f2db90 (LWP 1252)]
0xb7a5df75 in ?? () from /usr/lib/i686/cmov/libavcodec.so.52
(gdb) bt
#0  0xb7a5df75 in ?? () from /usr/lib/i686/cmov/libavcodec.so.52
#1  0x080a5e80 in ?? ()
#2  0xb5f2c510 in ?? ()
#3  0xb79cc996 in ?? () from /usr/lib/i686/cmov/libavcodec.so.52
#4  0xb56e6064 in ?? ()
#5  0xb5f2c510 in ?? ()
#6  0x00000400 in ?? ()
#7  0x00000002 in ?? ()
#8  0x082de410 in ?? ()
#9  0x082df410 in ?? ()
#10 0x00000000 in ?? ()
(gdb) disass 0xb7a5df65 0xb7a5df85
Dump of assembler code from 0xb7a5df65 to 0xb7a5df85:
0xb7a5df65:     cvtps2dq (%eax,%ecx,1),%xmm1
0xb7a5df6a:     packssdw %xmm1,%xmm0
0xb7a5df6e:     movhlps %xmm0,%xmm1
0xb7a5df71:     punpcklwd %xmm1,%xmm0
0xb7a5df75:     movdqa %xmm0,(%ebx,%ecx,1)
0xb7a5df7a:     add    $0x10,%ecx
0xb7a5df7d:     js     0xb7a5df60
0xb7a5df7f:     mov    (%esp),%ebx
0xb7a5df82:     mov    0x4(%esp),%esi
End of assembler dump.
(gdb) info regs
Undefined info command: "regs".  Try "help info".
(gdb) info registers eax 0x82e0410 137233424
ecx            0xfffff000       -4096
edx            0xb5f2c510       -1242381040
ebx            0xb56e7064       -1251053468

So it looks like an alignment bug, just like before.



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