Re: WARNING in update_load_avg

[Dmitry Vyukov]

On Wed, Mar 20, 2019 at 1:55 PM syzbot
<syzbot+20fddccabc274e99398e@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> syzbot has bisected this bug to:
>
> commit b8a51b38e4d4dec3e379d52c0fe1a66827f7cf1e
> Author: Stefano Brivio <sbrivio@xxxxxxxxxx>
> 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> 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