e2fsck fails with Journal superblock has an unknown incompatible feature flag set

Solution Verified - Updated -

Issue

  • e2fsck fails to check an ext4 file system even after removing the 64bit file system feature.
# e2fsck /<device-name>
e2fsck 1.41.12 (17-May-2010)
Journal superblock has an unknown incompatible feature flag set.
Abort<y>? 

Environment

  • Red Hat Enterprise Linux 6
  • e2fsck

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