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io_uring: don't run task work on an exiting task

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This isn't safe, and isn't needed either. We are guaranteed that any
work we queue is on a live task (and will be run), or it goes to
our backup io-wq threads if the task is exiting.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2020-09-13 14:38:30 -06:00
parent 87ceb6a6b8
commit 6200b0ae4e
1 changed files with 11 additions and 0 deletions
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11
fs/io_uring.c
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@ -1753,6 +1753,9 @@ static int io_req_task_work_add(struct io_kiocb *req, struct callback_head *cb,
struct io_ring_ctx *ctx = req->ctx;
int ret, notify;
if (tsk->flags & PF_EXITING)
return -ESRCH;
/*
* SQPOLL kernel thread doesn't need notification, just a wakeup. For
* all other cases, use TWA_SIGNAL unconditionally to ensure we're
@ -2012,6 +2015,12 @@ static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req)
static inline bool io_run_task_work(void)
{
/*
* Not safe to run on exiting task, and the task_work handling will
* not add work to such a task.
*/
if (unlikely(current->flags & PF_EXITING))
return false;
if (current->task_works) {
__set_current_state(TASK_RUNNING);
task_work_run();
@ -8184,6 +8193,8 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
/* cancel this request, or head link requests */
io_attempt_cancel(ctx, cancel_req);
io_put_req(cancel_req);
/* cancellations _may_ trigger task work */
io_run_task_work();
schedule();
finish_wait(&ctx->inflight_wait, &wait);
}