syzbot suspects this bug was fixed by commit:
commit 173d9d9fd3ddae84c110fea8aedf1f26af6be9ec
Author: Hugh Dickins <hughd@xxxxxxxxxx>
Date: Fri Nov 30 22:10:16 2018 +0000
mm/huge_memory: splitting set mapping+index before unfreeze
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14202b7ae00000
start commit: a27fc142 Merge branch 'parisc-4.17-3' of git://git.kernel...
git tree: upstream
kernel config: https://syzkaller.appspot.com/x/.config?x=adeb81fdb5db9d72
dashboard link: https://syzkaller.appspot.com/bug?extid=f2a1633f249cece865fe
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1257325b800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=163bb567800000
If the result looks correct, please mark the bug fixed by replying with:
#syz fix: mm/huge_memory: splitting set mapping+index before unfreeze
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
