linux-kernel - Re: [syzbot] [net] INFO: rcu detected stall in sys

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Date:   Wed, 30 Aug 2023 05:16:38 +0200
From:   Eric Dumazet <edumazet@...gle.com>
To:     syzbot <syzbot+e46fbd5289363464bc13@...kaller.appspotmail.com>
Cc:     brauner@...nel.org, davem@...emloft.net, eric.dumazet@...il.com,
        gautamramk@...il.com, hdanton@...a.com, jhs@...atatu.com,
        jiri@...nulli.us, kuba@...nel.org, lesliemonis@...il.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        mohitbhasi1998@...il.com, netdev@...r.kernel.org,
        pabeni@...hat.com, sdp.sachin@...il.com,
        syzkaller-bugs@...glegroups.com, tahiliani@...k.edu.in,
        viro@...iv.linux.org.uk, vsaicharan1998@...il.com,
        xiyou.wangcong@...il.com
Subject: Re: [syzbot] [net] INFO: rcu detected stall in sys_close (5)

On Wed, Aug 30, 2023 at 12:57 AM syzbot
<syzbot+e46fbd5289363464bc13@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit ec97ecf1ebe485a17cd8395a5f35e6b80b57665a
> Author: Mohit P. Tahiliani <tahiliani@...k.edu.in>
> Date:   Wed Jan 22 18:22:33 2020 +0000
>
>     net: sched: add Flow Queue PIE packet scheduler
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=101bb718680000
> start commit:   727dbda16b83 Merge tag 'hardening-v6.6-rc1' of git://git.k..
> git tree:       upstream
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=121bb718680000
> console output: https://syzkaller.appspot.com/x/log.txt?x=141bb718680000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=45047a5b8c295201
> dashboard link: https://syzkaller.appspot.com/bug?extid=e46fbd5289363464bc13
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14780797a80000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17c1fc9fa80000
>
> Reported-by: syzbot+e46fbd5289363464bc13@...kaller.appspotmail.com
> Fixes: ec97ecf1ebe4 ("net: sched: add Flow Queue PIE packet scheduler")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Yeah, I figured that out, and sent :

https://patchwork.kernel.org/project/netdevbpf/patch/20230829123541.3745013-1-edumazet@google.com/