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
