Kernel bug or hardware problem

Russell King - ARM Linux linux at
Fri Sep 18 16:26:05 EDT 2009

On Tue, Aug 25, 2009 at 04:05:12PM -0500, zql at 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  ( #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

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