the BUG_ON(). But unfortunately, our perf. team is able reproduce the
problem.

What are they doing to reproduce it?  How much setup does it take?

Debug indicated that, the ret2 == 1 :(

That could be consistent with the theory that we're racing with the dio struct being freed and reused before it's tested in the BUG_ON() condition. Suparna's suggestion to sample dio->is_async before releasing the refcount and using that in the BUG_ON condition is a good one.

- z
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