"ext4_lookup: deleted inode referenced" errors in /var/log/messages in RHEL 6

Issue

• Errors similar to the following in system logging:

EXT4-fs error (device dm-6): ext4_lookup: deleted inode referenced: 1048628
EXT4-fs error (device dm-6): ext4_lookup: deleted inode referenced: 1048628

• Directory warnings are being seen in the logs:

EXT4-fs warning (device dm-6): dx_probe: Unrecognised inode hash code 20
EXT4-fs warning (device dm-6): dx_probe: Corrupt dir inode 1048627, running e2fsck is recommended.

• After performing maintenance on my cluster nodes which required stopping/starting services with ext4 file systems, I see errors in the logs:

Mar 18 04:16:41 node1 kernel: EXT4-fs error (device dm-8): ext4_lookup: deleted inode referenced: 204277
Mar 18 04:16:41 node1 kernel: EXT4-fs error (device dm-8): ext4_lookup: deleted inode referenced: 204280
Mar 18 04:16:41 node1 kernel: EXT4-fs error (device dm-8): ext4_lookup: deleted inode referenced: 204279
Mar 18 04:16:41 node1 kernel: EXT4-fs error (device dm-8): ext4_lookup: deleted inode referenced: 204283
Mar 18 04:16:41 node1 kernel: EXT4-fs error (device dm-8): ext4_mb_free_metadata: Double free of blocks 4327 (4327 1)
Mar 18 04:16:41 node1 kernel: JBD: Spotted dirty metadata buffer (dev = dm-8, blocknr = 0). There's a risk of filesystem corruption in case of system crash.
Mar 18 04:16:45 node1 kernel: EXT4-fs error (device dm-8): mb_free_blocks: double-free of inode 0's block 563840(bit 6784 in group 17)
Mar 18 04:16:45 node1 kernel: EXT4-fs error (device dm-8): mb_free_blocks: double-free of inode 0's block 563841(bit 6785 in group 17)
Mar 18 04:16:45 node1 kernel: EXT4-fs error (device dm-8): mb_free_blocks: double-free of inode 0's block 563858(bit 6802 in group 17)