I have a similar bug on Slackware 12.2, kernel 2.6.27.7, but I found a
work around after reading bug 302552
The "quick fix" is to rename the sis-agp.ko module to something else.
sis-agp.ko is found in a directory like this:
/lib/modules/2.6.27.7*/kernel/drivers/char/agp/
It appears that the amd64-agp.ko module is the correct one, but for some
reason the sis-agp.ko module gets in the way.
One sign of the trouble is earlier in the dmesg log where the sis-agp.ko
module sets the agp aperture to 4M.. It should be 128M or so:
agpgart-sis 0000:00:00.0: AGP aperture is 4M @ ...
When my system is working correctly it shows this instead:
agpgart-amd64 0000:00:00.0: AGP aperture is 128M @ ...
This "bug" may be related to the build environment and the version of
the gcc compiler.
When I compile the 2.6.27.7 kernel on a Slackware 12.1 platform using
gcc 4.2.3 then everything works great! No bug.
But when I compile the 2.6.27.7 on a Slackware 12.2 platform using gcc
4.2.4 then it fails.
Kernel 2.6.26 also fails in a similar way, but does not generate a "kernel null
pointer".
It simply calls sis-agp.ko when compiled under gcc 4.2.3
and calls amd64-agp.ko when compiled under gcc 4.2.4.
--
ubuntu 8.10 crashes after about 5 minutes
https://bugs.launchpad.net/bugs/302522
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