io_uring: spin for sq thread to idle on shutdown

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commit df069d80c8 upstream.

As part of io_uring shutdown, we cancel work that is pending and won't
necessarily complete on its own. That includes requests like poll
commands and timeouts.

If we're using SQPOLL for kernel side submission and we shutdown the
ring immediately after queueing such work, we can race with the sqthread
doing the submission. This means we may miss cancelling some work, which
results in the io_uring shutdown hanging forever.

Cc: stable@vger.kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Jens Axboe 2020-02-04 16:48:34 -07:00 • committed by Greg Kroah-Hartman

parent f9ce114dfb

commit 4e345439cf

1 changed files with 12 additions and 1 deletions

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fs/io_uring.c

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