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

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Message-ID: <CACT4Y+b9naqoj4c3qaGrqwD1YsAb96zToZg8m2QCitovV9jj7g@mail.gmail.com>
Date:   Fri, 23 Oct 2020 11:56:04 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+60b38542a0dfb2e0f746@...kaller.appspotmail.com>
Cc:     David Howells <dhowells@...hat.com>,
        Frédéric Weisbecker <fweisbec@...il.com>,
        linux-afs@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: INFO: rcu detected stall in sys_newlstat

On Fri, Oct 23, 2020 at 11:34 AM syzbot
<syzbot+60b38542a0dfb2e0f746@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit 1d0e850a49a5b56f8f3cb51e74a11e2fedb96be6
> Author: David Howells <dhowells@...hat.com>
> Date:   Fri Oct 16 12:21:14 2020 +0000
>
>     afs: Fix cell removal
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=103fa33c500000
> start commit:   eff48dde Merge tag 'trace-v5.9-rc5' of git://git.kernel.or..
> git tree:       upstream
> kernel config:  https://syzkaller.appspot.com/x/.config?x=af502ec9a451c9fc
> dashboard link: https://syzkaller.appspot.com/bug?extid=60b38542a0dfb2e0f746
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14ddd69b900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=179a69ab900000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: afs: Fix cell removal
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Based on the reproducer looks right:

#syz fix: afs: Fix cell removal