[Bug 72181] ext4_mb_generate_buddy:free block calculation seems to overflow

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https://bugzilla.kernel.org/show_bug.cgi?id=72181

--- Comment #1 from WeiZhang <zweiustc@xxxxxxxxx> ---
usually, we just get a wrong number of "free" from bitmap while bitmap is
corrupted. but it should not larger than "max = EXT4_CLUSTERS_PER_GROUP(sb)"
right?

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