Distribution:         
Gentoo Linux

Hardware Environment: 
Linux ganymede 2.6.5-gentoo-r1 #9 Sun Oct 24 23:37:44 CEST 2004 x86_64 AMD
Athlon(tm) 64 Processor 3000+ AuthenticAMD GNU/Linux
Matrox Millenium graphics adapter
Soundblaster Live! soundcard

Software Environment:
kernel config          http://www.gubi24.de/users/helge/gentoo-2.6.9-r4.config
Gnu C                  3.4.3
Gnu make               3.80
binutils               2.15.92.0.2
util-linux             2.12i
mount                  2.12i
module-init-tools      3.0
e2fsprogs              1.35
reiserfsprogs          2003------------->
reiser4progs           line
xfsprogs               2.3.9
nfs-utils              1.0.6
Linux C Library        2.3.4
Dynamic linker (ldd)   2.3.4
Procps                 3.2.4
Net-tools              1.60
Kbd                    1.12
Sh-utils               5.2.1
Modules Loaded         
MPlayer                1.0pre2-3.3.3
Celestia               1.3.1

Problem Description:   
using mplayer for about 20 minutes to play AVI files, the kernel hangs. the
crash starts with a high-pitched whine from the sound track, after some seconds
tis develops into a loop of about half a second length consisting of the sound
playing at the moment of the crash. the image stands still. the computer totally
hangs otherwise, no way to switch to a console. there is no entry in the syslog
either.
using celestia (an application making heavy use of OpenGL graphics and textures)
for a variable time, the same crash appears. I have only used celestia with an
xmms playing along up to now, which led to the same sound as described above. I
do not know whether the crash was caused by a combination od graphics and sound
drivers or by graphics alone.
This bug is reproducible, it happens every time I use mplayer or celestia with
the kernel version mentioned.
On kernel 2.6.5-gentoo-r1, none of the crashes appear.
I feel I should stress that I use a very old Matrox Millennium I graphics
adapter. I had no occasion to test this behaviour on newer hardware.
I did not test the standard 2.6.9 kernel (without the gentoo patches) yet, but
the circumstance that 2.6.10-rc2 crashes too lets me expect the same behaviour.

Steps to reproduce:
Run mplayer, wait for half an hour maximum.
Run celestia, do some manipulations.