RHEL server filesystem went read-only mode with errors 'deleting unreferenced inode'

Issue

• Red Hat Enterprise Linux 5 server filesystem went read-only mode with errors 'deleting unreferenced inode'. The following are the log messages.

      Mar 24 18:59:31 server02 kernel: ext3_orphan_cleanup: deleting unreferenced inode 100734
      Mar 24 19:00:30 server02 kernel: EXT3-fs: sda2: 8182 orphan inodes deleted
      Mar 24 19:00:30 server02 kernel: EXT3-fs: recovery complete.
      Mar 24 19:00:30 server02 kernel: EXT3-fs: mounted filesystem with ordered data mode.
  
      EXT3-fs: INFO: recovery required on readonly filesystem.
      EXT3-fs: write access will be enabled during recovery.
      kjournald starting.  Commit interval 5 seconds 
      EXT3-fs: sda2: orphan cleanup on readonly fs
      ext3_orphan_cleanup: deleting unreferenced inode 98316
      ext3_orphan_cleanup: deleting unreferenced inode 98315
      ext3_orphan_cleanup: deleting unreferenced inode 98314 
      ext3_orphan_cleanup: deleting unreferenced inode 98313
      ext3_orphan_cleanup: deleting unreferenced inode 98312
      ext3_orphan_cleanup: deleting unreferenced inode 98311
      EXT3-fs: sda2: 6 orphan inodes deleted 
      EXT3-fs: recovery complete.
      EXT3-fs: mounted filesystem with ordered data mode.
  

• For ext4:

  ext4_orphan_cleanup: deleting unreferenced inode 57
  ext4_orphan_cleanup: deleting unreferenced inode 56
  ext4_orphan_cleanup: deleting unreferenced inode 55