NFS locking fails with "lockd: unexpected unlock status: 9 or 150994944"

Solution Unverified - Updated -

Environment

  • Red Hat Enterprise Linux 6 - NFS Client
  • Kernel 2.6.32-573
  • NetApp Clustered C-Mode Data ONTap (CDOT) - NFS Server
  • NFS Network File System v3

Issue

  • The following messages are printed to /var/log/messages periodically:
kernel: lockd: unexpected unlock status: 9
kernel: lockd: unexpected unlock status: 150994944

kernel: lockd: unexpected unlock status: 7
kernel: lockd: unexpected unlock status: 117440512

Resolution

  • Unknown at this point. Suspected to be an issue within the NetApp filer operating system.

  • Update kernel to 2.6.32-642.el6 or later to resolve issue.

Root Cause

  • [kernel] lockd: properly convert be32 values in debug messages.
        lockd: properly convert be32 values in debug messages

        lockd: server returns status 50331648
        it's quite hard to understand that number in this message is 3 in big endian

Diagnostic Steps

  • Decode the "9" error message:
kernel: lockd: unexpected unlock status: 9

include/linux/lockd/nlm.h
/* Return states for NLM */
enum {
        NLM_LCK_GRANTED                 = 0,
        NLM_LCK_DENIED                  = 1,
        NLM_LCK_DENIED_NOLOCKS          = 2,
        NLM_LCK_BLOCKED                 = 3,
        NLM_LCK_DENIED_GRACE_PERIOD     = 4,
#ifdef CONFIG_LOCKD_V4
        NLM_DEADLCK                     = 5,
        NLM_ROFS                        = 6,
        NLM_STALE_FH                    = 7,
        NLM_FBIG                        = 8,
        NLM_FAILED                      = 9,
#endif
};

This implies the Network Lock Manager failed.

  • Decode the "150994944" error message
kernel: lockd: unexpected unlock status: 150994944

The hexadecimal representation of 150994944 is 0x 9000 0000.

It's likely this means the same thing (ie: 9), the network byte order is just around the wrong way.

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