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SubjectRe: MM deadlock [was: Re: arca-vm-8...]
> The problem is that "owner" can be stale, and can be updated outside the
> semaphore spinlock by a successful down() - which means that there are no
> synchronizing primitives there to guarantee that the slow part sees the
> new owner.

The only instruction I can see that can adjust both the count and owner
together is cmpxchg8, and I don't see a good way to use it.


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