Re: KASAN: slab-out-of-bounds Read in bitmap_port_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=170438d6e00000
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=148438d6e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=108438d6e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d9290aeb7e6cf1c4
dashboard link: https://syzkaller.appspot.com/bug?extid=53cdd0ec0bbabd53370a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17eb74c9e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=14db11d1e00000

Reported-by: syzbot+53cdd0ec0bbabd53370a@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b9a1e627405d ("hsr: implement dellink to clean up resources")

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