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    SubjectRe: [bug] stuck localhost TCP connections, v2.6.26-rc3+
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    On Mon, 2008-05-26 at 13:56 +0200, Ingo Molnar wrote:
    > in an overnight -tip testruns that is based on recent -git i got two
    > stuck TCP connections:
    >
    > Active Internet connections (w/o servers)
    > Proto Recv-Q Send-Q Local Address Foreign Address
    > State
    > tcp 0 174592 10.0.1.14:58015 10.0.1.14:3632
    > ESTABLISHED
    > tcp 72134 0 10.0.1.14:3632 10.0.1.14:58015
    > ESTABLISHED
    >
    > on a previously reliable machine. That connection has been stuck for 9
    > hours so it does not time out, etc. - and the distcc run that goes over
    > that connection is stuck as well.
    >
    > kernel config is attached.
    >
    > in terms of debugging there's not much i can do i'm afraid. It's not
    > possible to get a tcpdump of this incident, given the extreme amount of
    > load these testboxes handle. This problem started sometime around rc3
    > and it occured on two boxes (on a laptop and on a desktop), both are SMP
    > Core2Duo based systems. I never saw this problem before on thousands of
    > similar bootups, so i'm 99.9% sure the bug is either new or became
    > easier to trigger.
    >
    > It's not possible to bisect it as it needs up to 12 hours of heavy
    > workload to trigger. The incident happened about 5 times since the first
    > incident a couple of days ago - 4 times on one box and once on another
    > box. The first failing head i became aware of was 78b58e549a3098. (-tip
    > has other changes beyond -git but changes nothing in networking.)
    >
    > One clue (which might or might not matter) is that distcc is one of the
    > very few applications that makes use of sendfile().

    Just a quick note to say, me too!!

    same scenario: distcc on localhost.



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