On Sun, 13 Aug 2023 23:23:25 +0800, chengming.zhou@linux.dev wrote:

Chuck reported [1] a IO hang problem on NFS exports that reside on SATA
devices and bisected to commit 615939a2ae73 ("blk-mq: defer to the normal
submission path for post-flush requests").

We analysed the IO hang problem, found there are two postflush requests
are waiting for each other.

[...]

Applied, thanks!

[1/1] blk-mq: release scheduler resource when request complete
      (no commit info)

Best regards,
-- 
Jens Axboe