On 08/03/2017 02:35 PM, Jens Axboe wrote: >> I agree with what you wrote in the description of this patch. >> However, since I have not yet found the code that clears tags->rqs[], >> would it be possible to show me that code? > > Since it's been a month since I wrote this code, I went and looked > too. My memory was that we set/clear it dynamically since we added > scheduling, but looks like we don't clear it. The race is still valid > for when someone runs a tag check in parallel with someone allocating > a tag, since there's a window of time where the tag bit is set, but > ->rqs[tag] isn't set yet. That's probably the race I hit, not the > completion race mentioned in the change log.
Rewrote the commit message: http://git.kernel.dk/cgit/linux-block/commit/?h=mq-inflight&id=1908e43118e688e41ac8656edcf3e7a150f3f5081 -- Jens Axboe
