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

[syzbot]

syzbot has bisected this bug to:

commit d68dbb0c9ac8b1ff52eb09aa58ce6358400fa939
Author: Christian Brauner <christian@xxxxxxxxxx>
Date:   Thu Jun 20 23:26:35 2019 +0000

    arch: handle arches who do not yet define clone3

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1456fed1e00000
start commit:   09d4f10a net: sched: act_ctinfo: fix memory leak
git tree:       net
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1656fed1e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1256fed1e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7e89bd00623fe71e
dashboard link: https://syzkaller.appspot.com/bug?extid=6491ea8f6dddbf04930e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=141af959e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1067fa85e00000

Reported-by: syzbot+6491ea8f6dddbf04930e@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: d68dbb0c9ac8 ("arch: handle arches who do not yet define clone3")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection