Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Message-ID: <8cf1ef4e-03b6-4da2-530f-65058c57a9d1@kernel.dk>
Date:   Tue, 17 May 2022 12:34:00 -0600
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (X11; Linux aarch64; rv:91.0) Gecko/20100101
 Thunderbird/91.8.1
Subject: Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in
 io_do_iopoll
Content-Language: en-US
To:     syzbot <syzbot+1a0a53300ce782f8b3ad@syzkaller.appspotmail.com>,
        asml.silence@gmail.com, io-uring@vger.kernel.org,
        linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
References: <00000000000093a60105df3918eb@google.com>
From:   Jens Axboe <axboe@kernel.dk>
In-Reply-To: <00000000000093a60105df3918eb@google.com>
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 7bit
Precedence: bulk

On 5/17/22 12:13 PM, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    42226c989789 Linux 5.18-rc7
> git tree:       upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=125b807ef00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=902c5209311d387c
> dashboard link: https://syzkaller.appspot.com/bug?extid=1a0a53300ce782f8b3ad
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=149eb59ef00000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17cc57c6f00000
> 
> The issue was bisected to:
> 
> commit 3f1d52abf098c85b177b8c6f5b310e8347d1bc42
> Author: Jens Axboe <axboe@kernel.dk>
> Date:   Tue Mar 29 16:43:56 2022 +0000
> 
>     io_uring: defer msg-ring file validity check until command issue

#syz test git://git.kernel.dk/linux-block io_uring-5.18

-- 
Jens Axboe