Re: nfs tranfers hang in state getblck or nfsread

From: Alexander Leidinger (Alexander_at_Leidinger.net)
Date: 08/28/03

  • Next message: Peter Ulrich Kruppa : "Re: ftpd on -CURRENT ?" 
    Date: Thu, 28 Aug 2003 19:33:42 +0200
To: freebsd-current@freebsd.org

    On Thu, 28 Aug 2003 08:54:07 -0400 (EDT)
    Robert Watson <rwatson@freebsd.org> wrote:

    > Ok, so let me see if I have the sequence of events straight:
    >
    > (1) Boot a 4.8-RELEASE/STABLE NFS server
    > (2) Boot a 5.1-RELEASE/CURRENT NFS client
    > (3) Mount a file system using TCP NFSv3
    > (4) Reboot the client system, reboot, and remount
    > (5) Thrash the file system a bit with large reads/writes, and it hangs
    >
    > Is this correct? I'd like to work out the minimum sequence of events
    > necessary to cause the problem. Is (4) necessary to reproduce the hang,
    > or can you cause it without (4) if you wait long enough? You mention a

    As my server "never" shuts down and the 5-current client is switched off
    in the night, I don't know about (4), but I don't think it's necessary
    (on a shutdown the filesystems get umounted and /var/db/mountdtab only
    show one mount for the client).

    > server reboot here, also, so I want to make sure I'm not confused about
    > the steps to hit the problem.

    In my case there's no server reboot.

    > Once the hang is occuring on the client, can you drop into DDB and do a
    > ps, and in particular, paste into an e-mail any lines about nfsiod
    > threads, and any threads that are blocked in nfs?

    Normally I don't notice that it is blocked, as you see in the following,
    it may also be the case, that the server is alive again in the same
    second:
    ---snip---
    /var/log/messages.0.bz2:Aug 24 11:52:05 Magelan kernel: nfs server Andro-Beta:/big/Windows: not responding
    /var/log/messages.0.bz2:Aug 24 11:52:27 Magelan kernel: nfs server Andro-Beta:/big/Windows: is alive again
    /var/log/messages.0.bz2:Aug 24 11:52:28 Magelan kernel: nfs server Andro-Beta:/big/Windows: not responding
    /var/log/messages.0.bz2:Aug 24 11:52:36 Magelan kernel: nfs server Andro-Beta:/big/Windows: is alive again
    /var/log/messages.0.bz2:Aug 24 11:52:46 Magelan kernel: nfs server Andro-Beta:/big/Windows: not responding
    /var/log/messages.0.bz2:Aug 24 11:52:46 Magelan kernel: nfs server Andro-Beta:/big/Windows: not responding
    /var/log/messages.0.bz2:Aug 24 11:52:46 Magelan kernel: nfs server Andro-Beta:/big/Windows: is alive again
    /var/log/messages.0.bz2:Aug 24 11:52:46 Magelan kernel: nfs server Andro-Beta:/big/Windows: is alive again
    /var/log/messages.0.bz2:Aug 24 11:53:13 Magelan kernel: nfs server Andro-Beta:/big/Windows: not responding
    /var/log/messages.0.bz2:Aug 24 11:53:58 Magelan kernel: nfs server Andro-Beta:/big/Windows: is alive again
    ---snip---

    > For kicks, try disabling rpc.lockd on all sides, as well as rpc.statd. I
    > don't think they're involved here, but it's worth disabling them to be
    > sure.

    There's no lockd running, only the statd on the server, so we already
    can rule out the lockd.

    BTW.: Robert, mwlucas CCed you in a mail regarding the use of the
    FreeBSD Foundation address for the commercial icc license, can you
    please confirm that you got the mail?

    Bye,
    Alexander. 

    -- 
                       There's no place like ~
http://www.Leidinger.net                       Alexander @ Leidinger.net
  GPG fingerprint = C518 BC70 E67F 143F BE91  3365 79E2 9C60 B006 3FE7
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  • Next message: Peter Ulrich Kruppa : "Re: ftpd on -CURRENT ?"

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