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SubjectRe: WARNING in print_bfs_bug
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syzbot has bisected this bug to:

commit 9c61acffe2b8833152041f7b6a02d1d0a17fd378
Author: Song Liu <songliubraving@fb.com>
Date: Wed Oct 23 00:24:28 2019 +0000

mm,thp: recheck each page before collapsing file THP

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15be4e14e00000
start commit: 49afce6d Add linux-next specific files for 20191031
git tree: linux-next
final crash: https://syzkaller.appspot.com/x/report.txt?x=17be4e14e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=13be4e14e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=3c5f119b33031056
dashboard link: https://syzkaller.appspot.com/bug?extid=62ebe501c1ce9a91f68c
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c162f4e00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=131b5eb8e00000

Reported-by: syzbot+62ebe501c1ce9a91f68c@syzkaller.appspotmail.com
Fixes: 9c61acffe2b8 ("mm,thp: recheck each page before collapsing file THP")

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

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