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SubjectNFS Locking violates protocol spec (incompatible with FreeBSD)

can be found the following comment:

35 /*
36 * NLM cookies. Technically they can be 1K, Nobody uses over 8 bytes
37 * however.
38 */
40 struct nlm_cookie
41 {
42 unsigned char data[8];
43 unsigned int len;
44 };
Unfortunately, this is incorrect: FreeBSD 5.x's rpc.lockd uses a 16
byte cookie, and therefore FreeBSD 5.x NFS clients cannot interoperate
with Linux when NFS locking is enabled.

contains more details about this problem, including a workaround for
FreeBSD to limit the cookie size to 8 bytes. Obviously, it would be
better for this bug to be fixed in Linux, since Linux is
non-conformant to the protocol.


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