Why some cifs shares were lost showing the message "CIFS VFS: Unexpected lookup error -512" on RHEL 6.4?

Solution Verified - Updated -

Issue

  • cifs shares got unmounted with the messages.
 kernel: CIFS VFS: Unexpected lookup error -512
 kernel: CIFS VFS: No task to wake, unknown frame received! NumMids 0
 kernel: CIFS VFS: Unexpected SMB signature

Environment

  • Red Hat Enterprise Linux 6.4
  • kernel versions earlier than 2.6.32-408

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