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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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