EXT3-fs error - Freeing blocks not in datazone

[Muhammed Sameer]

Hello,

* For further analysis the server that we use is a quad core 64bit server with 2 MB of RAM we faced a file system error as mentioned below on a 
RAID 1. We have a hardware raid and the raid controller is ADAPTEC

* Our kernel is 2.6.18-53.1.14.el5

* The error that our machine faced is as below

* One of our servers experienced a file system corruption
 and gave this error in the /var/log/messages file.
> 
> {code}
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1):
> ext3_free_blocks: Freeing blocks not in datazone - blo
> ck = 2684399216, count = 1
> Jun 17 05:53:47 myhost kernel: Aborting journal on device
> sdb1.
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1)
> in ext3_free_blocks_sb: Journal has aborted
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1)
> in ext3_free_blocks_sb: Journal has aborted
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1)
> in ext3_reserve_inode_write: Journal has aborted
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1)
> in ext3_truncate: Journal has aborted
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1)
> in ext3_reserve_inode_write: Journal has aborted
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1)
> in ext3_orphan_del: Journal has aborted
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1)
> in ext3_reserve_inode_write: Journal has aborted
> Jun 17 05:53:47 myhost kernel: ext3_abort called.
> Jun 17 05:53:47 myhost kernel: EXT3-fs error (device sdb1):
> ext3_journal_start_sb: Detected aborted journal
> Jun 17 05:53:47 myhost kernel: Remounting filesystem
> read-only
> Jun 17 05:53:47 myhost kernel:
> __journal_remove_journal_head: freeing b_committed_data
> {code}
> 
> * The file system then went into read only mode
> 
> * We tried to unmount and then remount the file system,but
> on trying to unmount the server simply hung and we had to
> restart the machine
> 
> * Fsck found errors on the file system and fixed it
> 
> * This filesystem is on a raid partition (RAID 1) and the
> physical and virtual disk caches are turned on.
> 
> * Even the barrier option for this file system was on to
> prevent any corruption of the data in case of a sudden
> reset
> 
> * Can some one please point to me what is that went wrong
> exactly and how we can avoid this in the future
> 
> Regards,
> Muhammed Sameer
> 
> 
> 
> 
> 
>       
> 
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