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Date:   Fri, 5 Mar 2021 08:58:14 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+aa7d098bd6fa788fae8e@...kaller.appspotmail.com>
Cc:     David Miller <davem@...emloft.net>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Jiří Pírko <jiri@...nulli.us>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Subject: Re: INFO: rcu detected stall in corrupted (4)

On Fri, Sep 4, 2020 at 8:49 PM syzbot
<syzbot+aa7d098bd6fa788fae8e@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    0f091e43 netlabel: remove unused param from audit_log_form..
> git tree:       net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=14551a71900000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=61025c6fd3261bb1
> dashboard link: https://syzkaller.appspot.com/bug?extid=aa7d098bd6fa788fae8e
> compiler:       gcc (GCC) 10.1.0-syz 20200507
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14eeda25900000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=161472f5900000
>
> The issue was bisected to:
>
> commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
> Author: Vinicius Costa Gomes <vinicius.gomes@...el.com>
> Date:   Sat Sep 29 00:59:43 2018 +0000
>
>     tc: Add support for configuring the taprio scheduler

This still happens. The bisection and repro look correct, the repro
also sets up taprio scheduler;
https://syzkaller.appspot.com/bug?id=7349616606afa3c986c377792f7ccbf9daae1142

Vinicius, could you please take a look? Thanks

> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13096476900000
> console output: https://syzkaller.appspot.com/x/log.txt?x=17096476900000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+aa7d098bd6fa788fae8e@...kaller.appspotmail.com
> Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")
>
> hrtimer: interrupt took 18040217 ns
> rcu: INFO: rcu_preempt self-detected stall on CPU
> rcu:    0-....: (1 ticks this GP) idle=4ae/0/0x1 softirq=7665/7665 fqs=3
>         (t=11294 jiffies g=9289 q=363)
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
> --
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