Messages in this thread | | | Date | Wed, 23 Apr 2008 12:05:01 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: 2.6.25-git2: BUG: unable to handle kernel paging request at ffffffffffffffff |
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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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