Kernel bug or hardware problem

On Tue, Aug 25, 2009 at 04:05:12PM -0500, zql at glomationinc.com wrote:

Atmel 9G20 based custom board with 32MB SDRAM.  Experiencing "random"
segmentation faults.  The following is an example,

Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = c1edc000
[00000000] *pgd=21ddc031, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1]
Modules linked in:
CPU: 0    Not tainted  (2.6.27.4 #4)
PC is at __bug+0x20/0x2c

This is a BUG(), but it seems that you've disabled verbose bug reporting.
It'd be useful to have it enabled.  There's several BUG()s in
cache_alloc_refill, so no idea which.

Also, I think you should report this on lkml; I'm sure there are people
more experienced with the slab allocator who might be able to comment on
this.