Receiving the error "Circular directory structure" when running 'du' on a mounted NFS-share from a ISILON Filer

Issue

• Received the error Circular directory structure when running 'du' on a mounted NFS-share from a ISILON Filer.

isilon:/ifs/SHARED/ORACLE12/TAS6341_01
                       40G     0   40G   0% /u01/app/oragg
node1 ~]# du -sh /u01/app/*
634M    /u01/app/oraagent
5.9G    /u01/app/oraallegrod
du: WARNING: Circular directory structure.
This almost certainly means that you have a corrupted file system.
NOTIFY YOUR SYSTEM MANAGER.
The following directory is part of the cycle:
  `/u01/app/oragg/.snapshot'

2.0K    /u01/app/oragg
4.2G    /u01/app/orainfra
6.9G    /u01/app/orainfrahome
20M /u01/app/oraInventory
2.6G    /u01/app/oraodi
5.3G    /u01/app/oratstad
5.9G    /u01/app/orawgestord