Re: exit_mmap() BUG_ON triggering since 3.1

[Roland Dreier]

On Wed, Feb 15, 2012 at 6:14 PM, Hugh Dickins <hughd@xxxxxxxxxx> wrote:
> My suspicion was that it would be related to Transparent HugePages:
> they do complicate the pagetable story.  And I think I have found a
> potential culprit.  I don't know if nr_ptes is the only loser from
> these two split_huge_pages calls, but assuming it is...

Do you have an idea when this bug might have been introduced?
Presumably it's been there since THP came in?

The reason I ask is that I have one of these exit_mm BUG_ONs
in my pile of one-off unreproducible crashes, but in my case it
happened with 2.6.39 (with THP enabled).  So I'm wondering if
I can cross it off my list and blame this bug, or if it remains one
of those inexplicable mysteries...

Thanks,
  Roland
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