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Date:   Sat,  7 Mar 2020 01:15:22 +0300
From:   Pavel Begunkov <>
To:     Jens Axboe <>,,
Subject: [PATCH 1/1] io_uring: fix lockup with timeouts

There is a recipe to deadlock the kernel: submit a timeout sqe with a
linked_timeout (e.g.  test_single_link_timeout_ception() from liburing),
and SIGKILL the process.

Then, io_kill_timeouts() takes @ctx->completion_lock, but the timeout
isn't flagged with REQ_F_COMP_LOCKED, and will try to double grab it
during io_put_free() to cancel the linked timeout. Probably, the same
can happen with another io_kill_timeout() call site, that is

Signed-off-by: Pavel Begunkov <>
 fs/io_uring.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 104f76aace29..94eca92d1354 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1089,6 +1089,7 @@ static void io_kill_timeout(struct io_kiocb *req)
 	if (ret != -1) {
+		req->flags |= REQ_F_COMP_LOCKED;
 		io_cqring_fill_event(req, 0);

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