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

commit 5db470e229e22b7eda6e23b5566e532c96fb5bc3
Author: Jaegeuk Kim <>
Date: Thu Jan 10 03:17:14 2019 +0000

loop: drop caches if offset or block_size are changed

bisection log:
start commit: 2187f215 Merge tag 'for-5.5-rc2-tag' of git://git.kernel.o..
git tree: upstream
final crash:
console output:
kernel config:
dashboard link:
syz repro:
C reproducer:

Fixes: 5db470e229e2 ("loop: drop caches if offset or block_size are

For information about bisection process see:

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