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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 5.11 24/44] io_uring: fix ->flags races by linked timeouts
Date: Thu, 25 Mar 2021 07:24:39 -0400	[thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>

From: Pavel Begunkov <[email protected]>

[ Upstream commit efe814a471e0e58f28f1efaf430c8784a4f36626 ]

It's racy to modify req->flags from a not owning context, e.g. linked
timeout calling req_set_fail_links() for the master request might race
with that request setting/clearing flags while being executed
concurrently. Just remove req_set_fail_links(prev) from
io_link_timeout_fn(), io_async_find_and_cancel() and functions down the
line take care of setting the fail bit.

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 | 1 -
 1 file changed, 1 deletion(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 262fd4cfd3ad..b82fe753a6d0 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -6493,7 +6493,6 @@ static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
 	spin_unlock_irqrestore(&ctx->completion_lock, flags);
 
 	if (prev) {
-		req_set_fail_links(prev);
 		io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME);
 		io_put_req_deferred(prev, 1);
 	} else {
-- 
2.30.1


       reply	other threads:[~2021-03-25 11:26 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <[email protected]>
2021-03-25 11:24 ` Sasha Levin [this message]
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 25/44] io_uring: halt SQO submission on ctx exit Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 37/44] io_uring: imply MSG_NOSIGNAL for send[msg]()/recv[msg]() calls Sasha Levin
2021-03-25 11:24 ` [PATCH AUTOSEL 5.11 44/44] io_uring: call req_set_fail_links() on short send[msg]()/recv[msg]() with MSG_WAITALL Sasha Levin
     [not found] ` <[email protected]>
     [not found]   ` <[email protected]>
     [not found]     ` <[email protected]>
2021-03-25 12:11       ` [PATCH AUTOSEL 5.11 43/44] signal: don't allow STOP on PF_IO_WORKER threads Stefan Metzmacher
2021-03-25 13:38         ` Jens Axboe
2021-03-25 13:56           ` Stefan Metzmacher
2021-03-25 14:02             ` Jens Axboe
2021-03-25 15:00               ` Sasha Levin
2021-03-25 15:10               ` Jens Axboe

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