io_uring/futex: only mark private futex waits as inflight

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Inflight tracking of futex wait requests exists to ensure that do_exit()
-> io_uring_files_cancel() cancels them 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.

Shared futexes have no such dependency. A FLAGS_SHARED request always
resolves to either an inode based key or an mm-shared key, both of which
fail futex_key_is_private() and hence always hash into the global futex
hash, whose lifetime isn't tied to the mm.

Only mark vectored futex waits as inflight if the futex is private.

Cc: stable@vger.kernel.org
Fixes: 079afb081c ("io_uring/futex: mark wait requests as inflight")
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 06:50:47 -06:00

parent 73e7019097

commit 4d327bbd1c

1 changed files with 13 additions and 4 deletions

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io_uring/futex.c

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