Re: KASAN: slab-out-of-bounds Read in tick_sched_handle

[syzbot]

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=16f943e7200000
start commit:   b8a51b38 fou, fou6: ICMP error handlers for FoU and GUE
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=15f943e7200000
console output: https://syzkaller.appspot.com/x/log.txt?x=11f943e7200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b05cfdb4ee8ab9b2
dashboard link: https://syzkaller.appspot.com/bug?extid=09d51a30df9fe76edb2a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17359fab400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154a2a37400000

Reported-by: syzbot+09d51a30df9fe76edb2a@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b8a51b38 ("fou, fou6: ICMP error handlers for FoU and GUE")