linux-kernel - Re: [PATCH] io_uring: unregister eventfd while holding lock when freeing ring ctx

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Message-ID: <696e49fe-3d2e-da6c-2fc6-5d69bc7a60f9@kernel.dk>
Date:   Mon, 7 Feb 2022 06:46:46 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Usama Arif <usama.arif@...edance.com>, io-uring@...r.kernel.org,
        asml.silence@...il.com, linux-kernel@...r.kernel.org
Cc:     fam.zheng@...edance.com, lkp@...ts.01.org, lkp@...el.com,
        kernel test robot <oliver.sang@...el.com>
Subject: Re: [PATCH] io_uring: unregister eventfd while holding lock when
 freeing ring ctx

On 2/7/22 3:50 AM, Usama Arif wrote:
> This is because ctx->io_ev_fd is rcu_dereference_protected using
> ctx->uring_lock in io_eventfd_unregister. Not locking the function
> resulted in suspicious RCU usage reported by kernel test robot.

I'll fold this in with the change, thanks.

-- 
Jens Axboe