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From: Sasha Levin <[email protected]>
To: [email protected], [email protected]
Cc: Pavel Begunkov <[email protected]>,
	Jens Axboe <[email protected]>, Sasha Levin <[email protected]>,
	[email protected], [email protected]
Subject: [PATCH AUTOSEL 5.8 07/64] io_uring: fix req->work corruption
Date: Mon, 10 Aug 2020 15:08:02 -0400	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

From: Pavel Begunkov <[email protected]>

[ Upstream commit 8ef77766ba8694968ed4ba24311b4bacee14f235 ]

req->work and req->task_work are in a union, so io_req_task_queue() screws
everything that was in work. De-union them for now.

[  704.367253] BUG: unable to handle page fault for address:
	ffffffffaf7330d0
[  704.367256] #PF: supervisor write access in kernel mode
[  704.367256] #PF: error_code(0x0003) - permissions violation
[  704.367261] CPU: 6 PID: 1654 Comm: io_wqe_worker-0 Tainted: G
I       5.8.0-rc2-00038-ge28d0bdc4863-dirty #498
[  704.367265] RIP: 0010:_raw_spin_lock+0x1e/0x36
...
[  704.367276]  __alloc_fd+0x35/0x150
[  704.367279]  __get_unused_fd_flags+0x25/0x30
[  704.367280]  io_openat2+0xcb/0x1b0
[  704.367283]  io_issue_sqe+0x36a/0x1320
[  704.367294]  io_wq_submit_work+0x58/0x160
[  704.367295]  io_worker_handle_work+0x2a3/0x430
[  704.367296]  io_wqe_worker+0x2a0/0x350
[  704.367301]  kthread+0x136/0x180
[  704.367304]  ret_from_fork+0x22/0x30

Signed-off-by: Pavel Begunkov <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 493e5047e67c9..acd98df1f7d44 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -669,12 +669,12 @@ struct io_kiocb {
 		 * restore the work, if needed.
 		 */
 		struct {
-			struct callback_head	task_work;
 			struct hlist_node	hash_node;
 			struct async_poll	*apoll;
 		};
 		struct io_wq_work	work;
 	};
+	struct callback_head	task_work;
 };
 
 #define IO_PLUG_THRESHOLD		2
-- 
2.25.1


       reply	other threads:[~2020-08-10 19:33 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <[email protected]>
2020-08-10 19:08 ` Sasha Levin [this message]
2020-08-10 19:08 ` [PATCH AUTOSEL 5.8 61/64] io_uring: fix racy overflow count reporting Sasha Levin
2020-08-10 19:08 ` [PATCH AUTOSEL 5.8 62/64] io_uring: fix stalled deferred requests Sasha Levin

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