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    SubjectNFSv4 poops itself
    Background:

    Server: x86-64 dual core Intel, kernel 2.6.23-rc1 (my home fileserver)
    Exporting NFS/NFSv4 mounts. Client count: 1 Uptime: 4 days

    Client: x86-64 dual core Intel, kernel 2.6.23-rc1 (my main workstation)
    NFS mount setup:
    pretzel:/ on /g type nfs4 (rw,noatime,proto=tcp,addr=10.10.10.1)
    Uptime: 4 days

    Home directory mounted via NFSv4.

    Problem:

    My workstation has been happily talking to my file server for several
    days without incident. An hour ago, my numeric keypad stopping working
    (unrelated problem... USB or X bug?). The solution to the keypad
    problem is usually to log out of X and log back in, or worse case, reboot.

    So, I log out, and log back in. At first, a few shell windows open and
    successfully initialize themselves (read bash profile over NFS, etc.)
    Then, as more shell windows open, things start hanging. I can easily
    switch to console and ssh to the fileserver, so it is clear this is an
    NFS hang.

    No adverse messages at all on the client.

    On the server, I see NFSv4 spamming dmesg with hundreds of thousands of
    messages:

    Jul 27 08:20:53 pretzel kernel: NFSD: preprocess_seqid_op: old stateid!
    Jul 27 08:21:24 pretzel last message repeated 167966 times
    Jul 27 08:21:55 pretzel last message repeated 173628 times
    Jul 27 08:21:55 pretzel kernel: NFSD: preprocess_seqid_op: old stateid!
    Jul 27 08:22:26 pretzel last message repeated 171286 times
    Jul 27 08:23:27 pretzel last message repeated 344461 times
    Jul 27 08:23:30 pretzel last message repeated 18656 times

    I rebooted the client, the problem disappeared, and everything is happy
    again... but clearly NFSv4 shat itself. And now I am worried this will
    happen again.

    In all my quite-heavy use of NFSv4 I've never seen this behavior before,
    so I would call this a regression.

    I always run vanilla linux-2.6.git self-built kernels on both client and
    server.

    Jeff


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