io_uring/futex: don't mark futex wake requests as inflight

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Commit 079afb081c ("io_uring/futex: mark wait requests as inflight")
added inflight tracking to ensure that do_exit() ->
io_uring_files_cancel() finds and cancels pending futex waits before the
mm goes away, as a private futex wait depends on the mm private futex
hash staying alive for the duration of the request. However, as
io_futex_prep() is shared between FUTEX_WAIT and FUTEX_WAKE, wake
requests got marked as inflight as well.

A futex wake executes fully inline at issue time and never depends on
the mm staying alive after completion, hence there's no need to track
it. Kill it.

Cc: stable@vger.kernel.org
Fixes: 079afb081c ("io_uring/futex: mark wait requests as inflight")
Reported-by: Chengfeng Lin <lin2530632123@gmail.com>
Link: https://lore.kernel.org/io-uring/CANGjgdn=R_qyUdE=j9za+vkmqcxacbP-84OHXF4nZ4ho9qRyVg@mail.gmail.com/
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Jens Axboe 2026-07-30 06:50:13 -06:00

parent c905736a46

commit 73e7019097

3 changed files with 13 additions and 1 deletions

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11

io_uring/futex.c

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1

io_uring/futex.h

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2

io_uring/opdef.c

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