XFS memory allocation deadlock in 2.6.38

[Sean Noonan]

> Regarding the deadlock: I am curious to see if it could be made to
> happen before 5ecfda041e4b4bd858d25bbf5a16c2a6c06d7272. Could you test
> what happens if you remove the MAP_POPULATE flag from your mmap call,
> and instead read all pages from userspace right after the mmap ? I
> expect you would then be able to trigger the deadlock before
> 5ecfda041e4b4bd858d25bbf5a16c2a6c06d7272.

I still see the deadlock without MAP_POPULATE

Sean