Reproducible error on FC4 + rsync.

From: Naoki (naoki_at_valuecommerce.com)
Date: 08/31/05

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    To: For users of Fedora Core releases <fedora-list@redhat.com>
Date: Wed, 31 Aug 2005 18:45:14 +0900

    Two boxes both with FC4.

    I start an rsync of about 11GB between them, and hilarity ensues. The
    client process hangs and needs to be CTRL-C'ed. The server locks up
    completely. Nothing returns from the console after entering a username
    and hitting return. It does reply to ping though.

    Client - 2.6.12-1.1398_FC4 i386
    Server - 2.6.12-1.1447_FC4smp x86_64

    I need to power cycle the server and here is what from 'sar' I found
    when it came back :

    proc/s = 100.00
    cswch/s = 0.00
    %iowait = 100.00
    intr/s = 100

    And so on.. There are no kernel messages either on console, nor in
    messages.

    I left top running on the server and this was the last screen dump :

    top - 16:27:01 up 16 min, 1 user, load average: 0.38, 0.10, 0.06
    Tasks: 58 total, 1 running, 57 sleeping, 0 stopped, 0 zombie
    Cpu(s): 3.0% us, 18.8% sy, 0.0% ni, 35.9% id, 41.6% wa, 0.0% hi,
    0.7% si
    Mem: 1023568k total, 508976k used, 514592k free, 40280k buffers
    Swap: 0k total, 0k used, 0k free, 99340k cached

      PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
     2329 root 16 0 282m 266m 744 D 37.3 26.6 0:01.42 rsync
     2253 root 15 0 38524 2876 2096 S 6.3 0.3 0:01.62 sshd

    Nothing crazy going on there and the cursor is still blinking.

    The rsync and SSH running on the client are stuck on an unfinished
    "select()" call.
    tethereal shows no traffic between the two (ohh by the way how do you
    get ethereal to show a more tcpdump style output so I can actually see
    the ports things are coming from / going to?).

    So, what do you recommend ? Network kernel debug or oprofile perhaps? 

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