diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 69f5b73a609e2f6d507990771c4b308c29fd4ad0..65dc2e3440041be35bc658145d42e8c68264746d 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -498,7 +498,11 @@ void io_queue_iowq(struct io_kiocb *req, struct io_tw_state *ts_dont_use)
 	struct io_uring_task *tctx = req->task->io_uring;
 
 	BUG_ON(!tctx);
-	BUG_ON(!tctx->io_wq);
+
+	if ((current->flags & PF_KTHREAD) || !tctx->io_wq) {
+		io_req_task_queue_fail(req, -ECANCELED);
+		return;
+	}
 
 	/* init ->work of the whole link before punting */
 	io_prep_async_link(req);