io_uring: break out of iowq iopoll on teardown

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[ upstream commit 45500dc4e0 ]

io-wq will retry iopoll even when it failed with -EAGAIN. If that
races with task exit, which sets TIF_NOTIFY_SIGNAL for all its workers,
such workers might potentially infinitely spin retrying iopoll again and
again and each time failing on some allocation / waiting / etc. Don't
keep spinning if io-wq is dying.

Fixes: 561fb04a6a ("io_uring: replace workqueue usage with io-wq")
Cc: stable@vger.kernel.org
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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This commit is contained in:

Pavel Begunkov 2023-09-12 14:57:06 +01:00 • committed by Greg Kroah-Hartman

parent b04f22b686

commit 605d055452

3 changed files with 13 additions and 0 deletions

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io_uring/io-wq.c

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io_uring/io-wq.h

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io_uring/io_uring.c

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