Commit e4956dc7 authored by Jens Axboe's avatar Jens Axboe
Browse files

io_uring/sqpoll: annotate debug task == current with data_race() 



There's a debug check in io_sq_thread_park() checking if it's the SQPOLL
thread itself calling park. KCSAN warns about this, as we should not be
reading sqd->thread outside of sqd->lock.

Just silence this with data_race(). The pointer isn't used for anything
but this debug check.

Reported-by: default avatar <syzbot+2b946a3fd80caf971b21@syzkaller.appspotmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 48cc7ecd

io_uring/sqpoll.c

+1 −1
Original line number Diff line number Diff line
@@ -44,7 +44,7 @@ void io_sq_thread_unpark(struct io_sq_data *sqd) 
void io_sq_thread_park(struct io_sq_data *sqd)

	__acquires(&sqd->lock)

{

	WARN_ON_ONCE(sqd->thread == current);

	WARN_ON_ONCE(data_race(sqd->thread) == current);



	atomic_inc(&sqd->park_pending);

	set_bit(IO_SQ_THREAD_SHOULD_PARK, &sqd->state);