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

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Date:   Tue, 3 May 2022 13:48:52 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+568dc81cd20b72d4a49f@...kaller.appspotmail.com>
Cc:     cgroups@...r.kernel.org, changbin.du@...el.com,
        christian.brauner@...ntu.com, davem@...emloft.net,
        edumazet@...gle.com, hannes@...xchg.org, hkallweit1@...il.com,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        lizefan.x@...edance.com, longman@...hat.com, mkoutny@...e.com,
        netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tj@...nel.org, yajun.deng@...ux.dev
Subject: Re: [syzbot] WARNING in cpuset_write_resmask

On Mon, 4 Apr 2022 at 21:25, syzbot
<syzbot+568dc81cd20b72d4a49f@...kaller.appspotmail.com> wrote:
>
> syzbot suspects this issue was fixed by commit:
>
> commit d068eebbd4822b6c14a7ea375dfe53ca5c69c776
> Author: Michal Koutný <mkoutny@...e.com>
> Date:   Fri Dec 17 15:48:54 2021 +0000
>
>     cgroup/cpuset: Make child cpusets restrict parents on v1 hierarchy
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=142f17f7700000
> start commit:   e5313968c41b Merge branch 'Split bpf_sk_lookup remote_port..
> git tree:       bpf-next
> kernel config:  https://syzkaller.appspot.com/x/.config?x=c40b67275bfe2a58
> dashboard link: https://syzkaller.appspot.com/bug?extid=568dc81cd20b72d4a49f
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13bb97ce700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12062c8e700000
>
> If the result looks correct, please mark the issue as fixed by replying with:
>
> #syz fix: cgroup/cpuset: Make child cpusets restrict parents on v1 hierarchy
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Based on commit subject looks reasonable:

#syz fix: cgroup/cpuset: Make child cpusets restrict parents on v1 hierarchy