[Bug 51431] New: ext4_mb_generate_buddy self ext4 errors

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https://bugzilla.kernel.org/show_bug.cgi?id=51431

           Summary: ext4_mb_generate_buddy self ext4 errors
           Product: File System
           Version: 2.5
    Kernel Version: 3.0.54-1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@kernel-bugs.osdl.org
        ReportedBy: zakrzewskim@wp.pl
        Regression: No


I'm getting ext4 errors in dmesg even if I unmount partition then make e4fsck
-fy -C0 /dev/md2.

I looks like this parition is mounted with no errors:

EXT4-fs (md2): mounted filesystem with ordered data mode. Opts:
usrjquota=aquota.user,grpjquota=aquota.group,usrquota,grpquota,jqfmt=vfsv0

then after few hours it shows itself:

EXT4-fs (md2): error count: 7
EXT4-fs (md2): initial error at 1354656587: ext4_mb_generate_buddy:736 EXT4-fs
(md2): last error at 1354664617: ext4_ext_split:929: inode 97911179

So far no other issues. 

Disks are fine. SMART ok. RAM checked with memtest and ok.

Partition mounted like this:

/dev/md2 /home ext4
rw,noatime,nodiratime,usrjquota=aquota.user,grpjquota=aquota.group,usrquota,grpquota,jqfmt=vfsv0
0 0

/dev/md2 2,7T 1,8T 885G 68% /home

md2 : active raid1 sdd3[2] sdc3[0]
      2914280100 blocks super 1.0 [2/2] [UU]

It happens only on 2x 3 TB RAID1 array.

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