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SubjectRe: kernel BUG at fs/buffer.c:LINE!
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syzbot has bisected this bug to:

commit 5db470e229e22b7eda6e23b5566e532c96fb5bc3
Author: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Thu Jan 10 03:17:14 2019 +0000

loop: drop caches if offset or block_size are changed

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13f3ca8ee00000
start commit: 2187f215 Merge tag 'for-5.5-rc2-tag' of git://git.kernel.o..
git tree: upstream
final crash: https://syzkaller.appspot.com/x/report.txt?x=100bca8ee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=17f3ca8ee00000
kernel config: https://syzkaller.appspot.com/x/.config?x=dcf10bf83926432a
dashboard link: https://syzkaller.appspot.com/bug?extid=cfed5b56649bddf80d6e
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1171ba8ee00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=107440aee00000

Reported-by: syzbot+cfed5b56649bddf80d6e@syzkaller.appspotmail.com
Fixes: 5db470e229e2 ("loop: drop caches if offset or block_size are
changed")

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

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