Does not solve the root of your problem, but can you umount –f ?

From: toasters-bounces@teaparty.net [mailto:toasters-bounces@teaparty.net] On Behalf Of Iluhes
Sent: Monday, December 22, 2014 2:42 PM
To: Toasters
Subject: new cdot NFS vserver. NFS mount point hang on I/O

Hi Folks,

New cdot isntall, new NFS vserver. NFS shares can be mounted OK on linnux and solaris clients.

I can mkdir and touch files. Copy or move or DD or any I/O operation completly hangs the mount point, the process cannot be Control-C, and kill -9 does not even help