linux-kernel - Re: [syzbot] general protection fault in io_kill

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Date:   Wed, 23 Mar 2022 19:35:46 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     syzbot <syzbot+f252f28df734e8521387@...kaller.appspotmail.com>,
        axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] general protection fault in io_kill_timeouts

On 3/23/22 18:47, syzbot wrote:
> syzbot has bisected this issue to:
> 
> commit c9be622494c012d56c71e00cb90be841820c3e34
> Author: Pavel Begunkov <asml.silence@...il.com>
> Date:   Mon Mar 21 22:02:20 2022 +0000
> 
>      io_uring: remove extra ifs around io_commit_cqring

Already found and fixed something pretty similar

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


> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15a04739700000
> start commit:   b61581ae229d Add linux-next specific files for 20220323
> git tree:       linux-next
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=17a04739700000
> console output: https://syzkaller.appspot.com/x/log.txt?x=13a04739700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=def28433baf109ed
> dashboard link: https://syzkaller.appspot.com/bug?extid=f252f28df734e8521387
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=117d3a43700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15538925700000
> 
> Reported-by: syzbot+f252f28df734e8521387@...kaller.appspotmail.com
> Fixes: c9be622494c0 ("io_uring: remove extra ifs around io_commit_cqring")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

-- 
Pavel Begunkov