New: EXT4-fs error (device sdf1): ext4_mb_complex_scan_group:1786: group 11890254 free clusters as per group info. But got 256 blocks

https://bugzilla.kernel.org/show_bug.cgi?id=72401

Bug ID: 72401
Summary: EXT4-fs error (device sdf1):
ext4_mb_complex_scan_group:1786: group 11890254 free clusters as per group info. But got 256 blocks
Product: File System
Version: 2.5
Kernel Version: 3.2
Hardware: IA-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: [email protected]
Reporter: [email protected]
Regression: No

EXT4-fs error (device sdf1): ext4_mb_complex_scan_group:1786: group 11890254 free clusters as per group info. But got 256 blocks
EXT4-fs error (device sdf1): ext4_mb_complex_scan_group:1786: group 11890494 free clusters as per group info. But got 496 blocks
EXT4-fs error (device sdf1): ext4_mb_complex_scan_group:1786: group 125222297 free clusters as per group info. But got 2304 blocks

The server log showed that the num of free blocks diffs from the result we calculate from the extent tree. I have not found how to reproduce it but it happened on several servers. I am trying to reproduce it and look into the code. I wonder anyone once confronted such a case before.

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https://bugzilla.kernel.org/show_bug.cgi?id=72401

WeiZhang <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

            Summary|EXT4-fs error (device       |EXT4-fs error (device
                   |sdf1):                      |sdf1):
                   |ext4_mb_complex_scan_group: |ext4_mb_complex_scan_group:
                   |1786: group 11890254 free   |1786: group 11890, 254 free
                   |clusters as per group info. |clusters as per group info.
                   |But got 256 blocks          |But got 256 blocks

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