linux-kernel - Re: [syzbot] WARNING in __percpu_ref

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Date:   Mon, 20 Sep 2021 10:15:12 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+d6218cb2fae0b2411e9d@...kaller.appspotmail.com>
Cc:     asml.silence@...il.com, axboe@...nel.dk, coreteam@...filter.org,
        davem@...emloft.net, dsahern@...nel.org, fw@...len.de,
        hdanton@...a.com, io-uring@...r.kernel.org, kadlec@...filter.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org, ming.lei@...hat.com,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        pablo@...filter.org, syzkaller-bugs@...glegroups.com,
        yoshfuji@...ux-ipv6.org
Subject: Re: [syzbot] WARNING in __percpu_ref_exit (2)

On Thu, 16 Sept 2021 at 16:01, syzbot
<syzbot+d6218cb2fae0b2411e9d@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot has tested the proposed patch and the reproducer did not trigger any issue:
>
> Reported-and-tested-by: syzbot+d6218cb2fae0b2411e9d@...kaller.appspotmail.com
>
> Tested on:
>
> commit:         5318e5b9 io_uring: quiesce files reg
> git tree:       https://github.com/isilence/linux.git syz_test_quiesce_files
> kernel config:  https://syzkaller.appspot.com/x/.config?x=f7d9f99709463d21
> dashboard link: https://syzkaller.appspot.com/bug?extid=d6218cb2fae0b2411e9d
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
>
> Note: testing is done by a robot and is best-effort only.

OK, since it's not failing, I assume we can say:

#syz fix: io_uring: fix link timeout refs

(and it's better to close it with a wrong fix, then to keep it open
forever anyway)