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    SubjectSendmail 8.9.0 claims a Linux kernel bug
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    Date
    From the Sendmail 8.9.0 Known Bugs List:

    * accept() problem on Linux.

    Apparently, the accept() in sendmail daemon loop can return ETIMEDOUT
    and cause sendmail to sleep for 5 seconds during which time no new
    connections will be accepted. An error is reported to syslog:

    Jun 9 17:14:12 hostname sendmail[207]: NOQUEUE: SYSERR(root):
    getrequests: accept: Connection timed out

    "Connection timed out" is not documented as a valid return from
    accept(2) and this is believed to be a bug in the Linux kernel.

    I'm running into this problem a *LOT*.

    Jun 24 18:09:41 always sendmail[1745]: NOQUEUE: SYSERR(root): getrequests: accept: No route to host
    Jun 24 18:10:13 always last message repeated 4 times
    Jun 24 18:11:17 always last message repeated 7 times
    Jun 24 18:12:21 always last message repeated 5 times
    Jun 24 18:13:21 always last message repeated 7 times
    Jun 24 18:14:24 always last message repeated 5 times
    Jun 24 18:15:26 always last message repeated 5 times
    Jun 24 18:16:03 always last message repeated 2 times
    Jun 24 18:17:15 always last message repeated 5 times
    Jun 24 18:18:17 always last message repeated 6 times
    Jun 24 18:19:23 always last message repeated 6 times


    and every time the error happens, sendmail refuses connections for
    5 seconds.

    What is going on here? This is a heavily loaded mail server. Is
    this really a Linux kernel bug?

    Ben

    --
    Brought to you by the letters K and T and the number 8.
    "If you turn both processors off, you will have to reboot." -- The Be Book
    Debian GNU/Linux -- where do you want to go tomorrow? http://www.debian.org/
    I'm on FurryMUCK as Che, and EFNet and YiffNet IRC as Che_Fox.

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