This is a note to let you know that I've just added the patch titled
io_uring: fix poll_remove stalled req completion
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
io_uring-fix-poll_remove-stalled-req-completion.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit fcaff8f33afba6a6bd55ae9465f3fb71552b5381
Author: Pavel Begunkov <asml.silence@xxxxxxxxx>
Date: Fri Mar 15 15:29:51 2024 +0000
io_uring: fix poll_remove stalled req completion
[ Upstream commit 5e3afe580a9f5ca173a6bd55ffe10948796ef7e5 ]
Taking the ctx lock is not enough to use the deferred request completion
infrastructure, it'll get queued into the list but no one would expect
it there, so it will sit there until next io_submit_flush_completions().
It's hard to care about the cancellation path, so complete it via tw.
Fixes: ef7dfac51d8ed ("io_uring/poll: serialize poll linked timer start with poll removal")
Signed-off-by: Pavel Begunkov <asml.silence@xxxxxxxxx>
Link: https://lore.kernel.org/r/c446740bc16858f8a2a8dcdce899812f21d15f23.1710514702.git.asml.silence@xxxxxxxxx
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/io_uring/poll.c b/io_uring/poll.c
index 7513afc7b702e..58b7556f621eb 100644
--- a/io_uring/poll.c
+++ b/io_uring/poll.c
@@ -995,7 +995,6 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
struct io_hash_bucket *bucket;
struct io_kiocb *preq;
int ret2, ret = 0;
- struct io_tw_state ts = { .locked = true };
io_ring_submit_lock(ctx, issue_flags);
preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table, &bucket);
@@ -1044,7 +1043,8 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags)
req_set_fail(preq);
io_req_set_res(preq, -ECANCELED, 0);
- io_req_task_complete(preq, &ts);
+ preq->io_task_work.func = io_req_task_complete;
+ io_req_task_work_add(preq);
out:
io_ring_submit_unlock(ctx, issue_flags);
if (ret < 0) {
