On Mon, 8 Sep 2008, John Baldwin wrote:
SVN rev 182879 on 2008-09-08 21:40:15Z by jhb
- Reduce scope of #ifdef's in uma_zcreate() call in init_turnstile0().
- Set UMA_ZONE_NOFREE so that the per-turnstile spin locks are type stable
to avoid a race where one thread might dereference a lock in a free'd
turnstile that was previously used by another thread.
Is this a feature or a workaround for a bug? Normally in the above scenario
we would consider use-after-free a bug or symptom of a larger architectural
problem rather than a feature. At least, that's what I consider similar use
of UMA_ZONE_NOFREE where it persists in the network stack :-).
Robert N M Watson
Computer Laboratory
University of Cambridge
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