linux-kernel - Re: INFO: rcu detected stall in tipc

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Date:   Mon, 21 Dec 2020 10:21:27 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+3654c027d861c6df4b06@...kaller.appspotmail.com>
Cc:     Markus Elfring <Markus.Elfring@....de>,
        Borislav Petkov <bp@...en8.de>, coreteam@...filter.org,
        David Miller <davem@...emloft.net>,
        Florian Westphal <fw@...len.de>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        Hillf Danton <hdanton@...a.com>,
        "H. Peter Anvin" <hpa@...or.com>, jmaloy@...hat.com,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kadlec@...filter.org,
        Jakub Kicinski <kuba@...nel.org>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        KVM list <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        netdev <netdev@...r.kernel.org>,
        NetFilter <netfilter-devel@...r.kernel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        subashab@...eaurora.org,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        tuong.t.lien@...tech.com.au,
        Vitaly Kuznetsov <vkuznets@...hat.com>, wanpengli@...cent.com,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: INFO: rcu detected stall in tipc_release

On Sun, Dec 20, 2020 at 10:37 AM syzbot
<syzbot+3654c027d861c6df4b06@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit cc00bcaa589914096edef7fb87ca5cee4a166b5c
> Author: Subash Abhinov Kasiviswanathan <subashab@...eaurora.org>
> Date:   Wed Nov 25 18:27:22 2020 +0000
>
>     netfilter: x_tables: Switch synchronization to RCU
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1445cb37500000
> start commit:   7cc2a8ea Merge tag 'block-5.8-2020-07-01' of git://git.ker..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=7be693511b29b338
> dashboard link: https://syzkaller.appspot.com/bug?extid=3654c027d861c6df4b06
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12948233100000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11344c05100000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: netfilter: x_tables: Switch synchronization to RCU
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

It's not immediately obvious that this is indeed the fix for this, but
also not obvious that this is not the fix for this. Bisection log
looks plausible.
Was this bug in tipc fixed? Is it the fix?
If I don't hear better suggestions I will close this bug as fixed by
this commit later.