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From:   Kent Overstreet <kent.overstreet@linux.dev>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     "Darrick J. Wong" <djwong@kernel.org>,
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        peterz@infradead.org, akpm@linux-foundation.org,
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On Thu, Aug 10, 2023 at 10:20:22PM -0700, Linus Torvalds wrote:
> If it's purely "umount doesnt' succeed because the filesystem is still
> busy with cleanups", then things are much better.

That's exactly it. We have various tests that kill -9 fio and then
umount, and umount spuriously fails.