On Mon, Apr 09, 2018 at 05:03:05PM +0000, Bart Van Assche wrote:
> My opinion is not only that the two patches that you posted recently do not
> fix all the races that are fixed by this patch but also that the races that

The race was with the path where the ownership of a timed out request
is passed back to normal completion path and those two patches fix
that, right?

> exist today in the blk-mq timeout handling code cannot be fixed completely
> using RCU only.

I really don't think that is that complicated.  Let's first confirm
the race fix and get to narrowing / closing that window.

> That race window did not exist in the legacy block layer. I don't think

IIRC, it did.  It was there when I first started working on libata EH
years ago.



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