linux-kernel - Re: WARNING in update_load

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Date:   Wed, 20 Mar 2019 14:01:54 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     syzbot <syzbot+20fddccabc274e99398e@...kaller.appspotmail.com>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Borislav Petkov <bp@...en8.de>,
        David Miller <davem@...emloft.net>,
        Dou Liyang <douly.fnst@...fujitsu.com>,
        "H. Peter Anvin" <hpa@...or.com>, konrad.wilk@...cle.com,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Len Brown <len.brown@...el.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        netdev <netdev@...r.kernel.org>, puwen@...on.cn,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Stefano Brivio <sbrivio@...hat.com>,
        Sabrina Dubroca <sd@...asysnail.net>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Subject: Re: WARNING in update_load_avg

On Wed, Mar 20, 2019 at 1:55 PM syzbot
<syzbot+20fddccabc274e99398e@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this bug to:
>
> commit b8a51b38e4d4dec3e379d52c0fe1a66827f7cf1e
> Author: Stefano Brivio <sbrivio@...hat.com>
> Date:   Thu Nov 8 11:19:23 2018 +0000
>
>      fou, fou6: ICMP error handlers for FoU and GUE
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14a48993200000
> start commit:   b8a51b38 fou, fou6: ICMP error handlers for FoU and GUE
> git tree:       net-next
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=16a48993200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=12a48993200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=d86f24333880b605
> dashboard link: https://syzkaller.appspot.com/bug?extid=20fddccabc274e99398e
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10272c5d400000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=157bd093400000
>
> Reported-by: syzbot+20fddccabc274e99398e@...kaller.appspotmail.com
> Fixes: b8a51b38 ("fou, fou6: ICMP error handlers for FoU and GUE")


That commit caused lots of crashes that look completely differently.
Now all that is fixed. The last crash for this bugs happened 2+ months
ago. So let's just do:

#syz fix:
fou: Prevent unbounded recursion in GUE error handler also with UDP-Lite