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io_uring: include dying ring in task_work "should cancel" state

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Commit 3539b1467e94336d5854ebf976d9627bfb65d6c3 upstream.

When running task_work for an exiting task, rather than perform the
issue retry attempt, the task_work is canceled. However, this isn't
done for a ring that has been closed. This can lead to requests being
successfully completed post the ring being closed, which is somewhat
confusing and surprising to an application.

Rather than just check the task exit state, also include the ring
ref state in deciding whether or not to terminate a given request when
run from task_work.

Cc: stable@vger.kernel.org # 6.1+
Link: https://github.com/axboe/liburing/discussions/1459
Reported-by: Benedek Thaler <thaler@thaler.hu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jens Axboe 2025-09-18 10:21:14 -06:00 committed by Greg Kroah-Hartman
parent c8e69b783b
commit abc9f859a9
4 changed files with 8 additions and 6 deletions
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6
io_uring/io_uring.c
View File

@ -1459,8 +1459,10 @@ static void io_req_task_cancel(struct io_kiocb *req, struct io_tw_state *ts)
void io_req_task_submit(struct io_kiocb *req, struct io_tw_state *ts)
{
io_tw_lock(req->ctx, ts);
if (unlikely(io_should_terminate_tw()))
struct io_ring_ctx *ctx = req->ctx;
io_tw_lock(ctx, ts);
if (unlikely(io_should_terminate_tw(ctx)))
io_req_defer_failed(req, -EFAULT);
else if (req->flags & REQ_F_FORCE_ASYNC)
io_queue_iowq(req);

4
io_uring/io_uring.h
View File

@ -402,9 +402,9 @@ static inline bool io_allowed_run_tw(struct io_ring_ctx *ctx)
* 2) PF_KTHREAD is set, in which case the invoker of the task_work is
* our fallback task_work.
*/
static inline bool io_should_terminate_tw(void)
static inline bool io_should_terminate_tw(struct io_ring_ctx *ctx)
{
return current->flags & (PF_KTHREAD | PF_EXITING);
return (current->flags & (PF_KTHREAD | PF_EXITING)) || percpu_ref_is_dying(&ctx->refs);
}
static inline void io_req_queue_tw_complete(struct io_kiocb *req, s32 res)

2
io_uring/poll.c
View File

@ -258,7 +258,7 @@ static int io_poll_check_events(struct io_kiocb *req, struct io_tw_state *ts)
{
int v;
if (unlikely(io_should_terminate_tw()))
if (unlikely(io_should_terminate_tw(req->ctx)))
return -ECANCELED;
do {

2
io_uring/timeout.c
View File

@ -307,7 +307,7 @@ static void io_req_task_link_timeout(struct io_kiocb *req, struct io_tw_state *t
int ret = -ENOENT;
if (prev) {
if (!io_should_terminate_tw()) {
if (!io_should_terminate_tw(req->ctx)) {
struct io_cancel_data cd = {
.ctx = req->ctx,
.data = prev->cqe.user_data,