Re: [PATCH 5.15] io_uring: don't forget to clear REQ_F_ARM_LTIMEOUT

[Jens Axboe <axboe@kernel.dk>]

On 8/16/21 12:16 PM, Pavel Begunkov wrote:
> Even though it should be safe to poke into req->link after
> io_issue_sqe() in terms of races, it may end up retiring a request, e.g.
> when someone calls io_req_complete(). It'll be placed into an internal
> request cache, so the memory would be valid with other guarantees, but
> the request will be actually dismantled and with requests linked removed
> and enqueued.
> 
> Hence, don't forget to remove REQ_F_ARM_LTIMEOUT after a linked timeout
> got disarmed, otherwise following io_prep_linked_timeout() will expect
> req->link to be not-zero and so fault.

Since its tip of tree, I will just fold this one in.

-- 
Jens Axboe