nas crashing with Bad file descriptor message in the log

Document ID : KB000095743
Last Modified Date : 14/05/2018
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Issue:
nas probe crashes several times daily.  The following messages can be found in the logs:

 nas: nimSessionWait: epoll_handle: -1 failed EPOLL_CTL_ADD fd:10 error: 9 errorStr: Bad file descriptor 
 nas: nimSessionWaitMsg: got error on client session: 0 
 nas: sockClose:0x7f1ccaee5d60:<IPAddress>/<PortNumber> 

 
Environment:
nas 9.00
nas 8.56
UBUNTU OS
Cause:
The cause is a defect in nas 8.56 and nas 9.0 running on the Ubuntu OS where a socket descriptor leak has been discovered.
Resolution:
Install NAS 9.0HF1 or NAS 8.56HF2