From: Jens Axboe axboe@kernel.dk
[ Upstream commit 7c977a58dc83366e488c217fd88b1469d242bee5 ]
If we're exiting the ring, just let the IO fail with -EAGAIN as nobody will care anyway. It's not the right context to reissue from.
Cc: stable@vger.kernel.org Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- fs/io_uring.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/fs/io_uring.c b/fs/io_uring.c index 5746998799ab..7625b3e2db2c 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -2617,6 +2617,13 @@ static bool io_rw_reissue(struct io_kiocb *req, long res) return false; if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker()) return false; + /* + * If ref is dying, we might be running poll reap from the exit work. + * Don't attempt to reissue from that path, just let it fail with + * -EAGAIN. + */ + if (percpu_ref_is_dying(&req->ctx->refs)) + return false;
ret = io_sq_thread_acquire_mm(req->ctx, req);