Re: 2.6.25-git2: BUG: unable to handle kernel paging request atffffffffffffffff

[Christoph Lameter]

On Wed, 23 Apr 2008, Pekka Enberg wrote:

>     fault = check_bytes(start + length, POISON_INUSE, remainder);

fault == NULL if the check was successful. Otherwise it contains the first
address that does not match our expectations.

>     if (!fault)
>             return 1;
>     while (end > fault && end[-1] == POISON_INUSE)
>             end--;
> 
>     slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
> 
> So how come we're printing out 'fault' as zero and 'end' at 4 GB? Christoph?

We should have returned from the function and not printed this message. If 
we somehow skipped the test for !fault then end could have wrapped around 
which gets us to 4GB.


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