linux-kernel - Re: [PATCH] io_uring: Fix WARNING in io_cqring_event

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Message-ID: <25b3b412-5b9c-4b53-b084-4b4cc8b60f90@kernel.dk>
Date: Wed, 3 Jul 2024 06:07:31 -0600
From: Jens Axboe <axboe@...nel.dk>
To: Pei Li <peili.dev@...il.com>, Pavel Begunkov <asml.silence@...il.com>
Cc: io-uring@...r.kernel.org, linux-kernel@...r.kernel.org,
 skhan@...uxfoundation.org, syzkaller-bugs@...glegroups.com,
 linux-kernel-mentees@...ts.linuxfoundation.org,
 syzbot+f7f9c893345c5c615d34@...kaller.appspotmail.com
Subject: Re: [PATCH] io_uring: Fix WARNING in io_cqring_event_overflow

On 7/2/24 6:48 PM, Pei Li wrote:
> Acquire ctx->completion_lock in io_add_aux_cqe().
> 
> syzbot reports a warning message in io_cqring_event_overflow(). We were
> supposed to hold ctx->completion_lock before entering this function, but
> instead we did not.
> 
> This patch acquires and releases ctx->completion_lock when entering and
> exiting io_add_aux_cqe().

Thanks for sending a patch, but Pavel already fixed it:

https://git.kernel.dk/cgit/linux/commit/?h=for-6.11/io_uring&id=3b7c16be30e35ec035b2efcc0f7d7b368789c443

-- 
Jens Axboe