On 11/26/21 10:58 AM, Kenneth R. Crudup wrote:

On Fri, 26 Nov 2021, Jens Axboe wrote:

quoted

Can you apply this on top of 5.16-rc2 or current -git and see if it fixes
it for you?

Since it's related to writeback throttling, is there anything I can try to
taunt it? I was thinking "iozone" or "bonnie++", but if there's something
better, let me know.

I'd just do what you usually do, that's usually the best way to gain
confidence in the fix. But it's related to writeback throttling _and_
racing with eg iostats grabbing a reference to the request, so it would
be more likely to trigger with a heavier combination of those two.

That said, I'm pretty confident in the fix, so if you'd just use it for
a day or two, then with the previous amount of hangs you saw on -rc2 it
should provide a good level of confidence in it.

-- 
Jens Axboe