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From: Pavel Begunkov <asml.silence@gmail.com>
To: Dmitry Vyukov <dvyukov@google.com>,
	syzbot <syzbot+d6218cb2fae0b2411e9d@syzkaller.appspotmail.com>
Cc: axboe@kernel.dk, coreteam@netfilter.org, davem@davemloft.net,
	dsahern@kernel.org, fw@strlen.de, hdanton@sina.com,
	io-uring@vger.kernel.org, kadlec@netfilter.org, kuba@kernel.org,
	linux-kernel@vger.kernel.org, ming.lei@redhat.com,
	netdev@vger.kernel.org, netfilter-devel@vger.kernel.org,
	pablo@netfilter.org, syzkaller-bugs@googlegroups.com,
	yoshfuji@linux-ipv6.org
Subject: Re: [syzbot] WARNING in __percpu_ref_exit (2)
Date: Thu, 16 Sep 2021 14:17:46 +0100	[thread overview]
Message-ID: <0ddad8d7-03c2-4432-64a4-b717bbc90fb4@gmail.com> (raw)
In-Reply-To: <CACT4Y+avszKiyXYBTRus9DqeSUoGrWC8d2uEiJN3z=oYQSdz0g@mail.gmail.com>

On 9/16/21 8:59 AM, Dmitry Vyukov wrote:
> On Mon, 13 Sept 2021 at 11:22, syzbot
> <syzbot+d6218cb2fae0b2411e9d@syzkaller.appspotmail.com> wrote:
>>
>> syzbot suspects this issue was fixed by commit:
>>
>> commit 43016d02cf6e46edfc4696452251d34bba0c0435
>> Author: Florian Westphal <fw@strlen.de>
>> Date:   Mon May 3 11:51:15 2021 +0000
>>
>>     netfilter: arptables: use pernet ops struct during unregister
>>
>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10acd273300000
>> start commit:   c98ff1d013d2 Merge tag 'scsi-fixes' of git://git.kernel.or..
>> git tree:       upstream
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=1c70e618af4c2e92
>> dashboard link: https://syzkaller.appspot.com/bug?extid=d6218cb2fae0b2411e9d
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=145cb2b6d00000
>> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=157b72b1d00000
>>
>> If the result looks correct, please mark the issue as fixed by replying with:
>>
>> #syz fix: netfilter: arptables: use pernet ops struct during unregister
>>
>> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> 
> I guess this is a wrong commit and it was fixed by something in io_uring.
> Searching for refcount fixes I see
> a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 "io_uring: fix link timeout
> refs".
> Pavel, does it look right to you?

I don't remember to be honest, if the dates fit, it can pretty well be it.
Let's test one thing to be sure it hasn't been shut just by coincidence.

#syz test: https://github.com/isilence/linux.git syz_test_quiesce_files


-- 
Pavel Begunkov

  reply	other threads:[~2021-09-16 13:18 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-15 11:58 [syzbot] WARNING in __percpu_ref_exit (2) syzbot
2021-03-15 12:18 ` Pavel Begunkov
     [not found] ` <20210318083340.1900-1-hdanton@sina.com>
2021-03-18 14:28   ` Pavel Begunkov
2021-04-18 19:30 ` syzbot
2021-04-19 12:07   ` Pavel Begunkov
2021-04-19 15:02     ` syzbot
2021-09-13  9:22 ` syzbot
2021-09-16  7:59   ` Dmitry Vyukov
2021-09-16 13:17     ` Pavel Begunkov [this message]
2021-09-16 14:01       ` syzbot
2021-09-20  8:15         ` Dmitry Vyukov

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