io_uring: fix wqe->lock/completion_lock deadlock
commit 907d1df30a51cc1a1d25414a00cde0494b83df7b upstream.
Joseph reports following deadlock:
CPU0:
...
io_kill_linked_timeout // &ctx->completion_lock
io_commit_cqring
__io_queue_deferred
__io_queue_async_work
io_wq_enqueue
io_wqe_enqueue // &wqe->lock
CPU1:
...
__io_uring_files_cancel
io_wq_cancel_cb
io_wqe_cancel_pending_work // &wqe->lock
io_cancel_task_cb // &ctx->completion_lock
Only __io_queue_deferred() calls queue_async_work() while holding
ctx->completion_lock, enqueue drained requests via io_req_task_queue()
instead.
Cc: stable@vger.kernel.org # 5.9+
Reported-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Tested-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/io_uring.c b/fs/io_uring.c
index fd12d93..907ecaf 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -972,6 +972,7 @@ static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
const struct iovec *fast_iov,
struct iov_iter *iter, bool force);
static void io_req_drop_files(struct io_kiocb *req);
+static void io_req_task_queue(struct io_kiocb *req);
static struct kmem_cache *req_cachep;
@@ -1502,18 +1503,11 @@ static void __io_queue_deferred(struct io_ring_ctx *ctx)
do {
struct io_defer_entry *de = list_first_entry(&ctx->defer_list,
struct io_defer_entry, list);
- struct io_kiocb *link;
if (req_need_defer(de->req, de->seq))
break;
list_del_init(&de->list);
- /* punt-init is done before queueing for defer */
- link = __io_queue_async_work(de->req);
- if (link) {
- __io_queue_linked_timeout(link);
- /* drop submission reference */
- io_put_req_deferred(link, 1);
- }
+ io_req_task_queue(de->req);
kfree(de);
} while (!list_empty(&ctx->defer_list));
}