Re: [syzbot] WARNING in change_pte_range

[syzbot]

syzbot has bisected this issue to:

commit b1f9e876862d8f7176299ec4fb2108bc1045cbc8
Author: Peter Xu <peterx@xxxxxxxxxx>
Date:   Fri May 13 03:22:56 2022 +0000

    mm/uffd: enable write protection for shmem & hugetlbfs

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=108e8fb8880000
start commit:   511cce163b75 Merge tag 'net-6.0-rc8' of git://git.kernel.o..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=128e8fb8880000
console output: https://syzkaller.appspot.com/x/log.txt?x=148e8fb8880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4520785fccee9b40
dashboard link: https://syzkaller.appspot.com/bug?extid=2c2bb573a9524a95e787
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14ecac35080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15668b38880000

Reported-by: syzbot+2c2bb573a9524a95e787@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: b1f9e876862d ("mm/uffd: enable write protection for shmem & hugetlbfs")

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