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"Error in flock(): No locks available" when modifying/adding/deleting a VZ on NFS

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I receive the following error on any actions (modify/add/delete) performed on a VZ running on an NFS share.
Code:

Error in flock(): No locks available
Also, when inside a running VZ (also on the NFS share) I receive similar errors about file locks.

Here is my environment.
Proxmox 3.1-24
3 host nodes with 4 NIC's. 2 switches in HA pair/trunk. 2 bonded NICs on each box for guest node traffic, 2 bonded NIC's for storage service. Both are also used for management access.

Storage server is a single server right now, eventually will be HA. It is running OpenFiler with NFS share for Proxmox - mostly default options except also has no_root_squash enabled.

This set up has run quite well for about 2 weeks, until this morning when it gave me this error. No changes have been made on host, guest, or storage nodes. All nodes have been hard rebooted since I saw the issue but it persists anyway.

Not sure what other details would be needed.

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