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

[syzbot]

syzbot has bisected this bug to:

commit b9a1e627405d68d475a3c1f35e685ccfb5bbe668
Author: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Date:   Thu Jul 4 00:21:13 2019 +0000

    hsr: implement dellink to clean up resources

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13ddfa85e00000
start commit:   25e73aad Merge tag 'io_uring-5.5-2020-01-16' of git://git...
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=103dfa85e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17ddfa85e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cfbb8fa33f49f9f3
dashboard link: https://syzkaller.appspot.com/bug?extid=df0d0f5895ef1f41a65b
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=124774c9e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15aa48d6e00000

Reported-by: syzbot+df0d0f5895ef1f41a65b@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b9a1e627405d ("hsr: implement dellink to clean up resources")

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