Re: PROBLEM: page allocation or what in 2.6.8.1

[Andrew Morton]

Harry Edmon <harry@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> I have had another crash on the same system as my message of 23 August:
> 
> Unable to handle kernel paging request at virtual address cf0b4e1c

hm.  Is the hardware known to be good?

> ...
> 
> Before the crash I see messages like the following:
> 
> oom-killer: gfp_mask=0xd0

That's because you've enabled CONFIG_DEBUG_PAGEALLOC.  It enormously
increases the size of slab objects, which seems to cause memory reclaim to
blow up.  (It shouldn't but it does.  It's a low-priority problem though).

It's unlikely that the oom-killing caused the oops, but it's possible I
guess.  There's supposed to be a dump_stack() in the out_of_memory() path,
which would help in searching for bugs, but that seems to have got lost.

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