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Subject2.4.9aa3
Only in 2.4.9aa2: 00_silent-stack-overflow-5
Only in 2.4.9aa3: 00_silent-stack-overflow-6

Updated to run expand_stack always with the mm write semaphore acquired
to fix the race conditions. Upgrading the semaphore during
map_user_kiobuf was quite painful so I just disallowed to do direct I/O
on a growsdown VMA (you can still do that as far as it doesn't need to
be live extended on the fly).

Only in 2.4.9aa3: 00_vm_raend-race-1

Sanitize the vm_raend field before trusting it, such field is racy.

Only in 2.4.9aa2: 10_expand-stack-smp-1

Dropped (it wasn't needed).

Only in 2.4.9aa2: 70_mmap-rb-4
Only in 2.4.9aa3: 70_mmap-rb-5

Backed out a few unnecessary minor changes.

Andrea
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