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    SubjectRe: [bug] stuck localhost TCP connections, v2.6.26-rc3+

    * Ingo Molnar <mingo@elte.hu> wrote:

    > after about 50 bootups i got a hung test again:
    >
    > titan:~/tip> netstat -nt
    > Active Internet connections (w/o servers)
    > Proto Recv-Q Send-Q Local Address Foreign Address
    > State
    > tcp 0 0 10.0.1.14:22 10.0.1.16:58062 ESTABLISHED
    > tcp 0 0 10.0.1.14:22 10.0.1.16:60109 ESTABLISHED
    > tcp 0 86368 10.0.1.14:43914 10.0.1.16:3632 ESTABLISHED
    >
    > and this time with CUBIC_TCP disabled - so that was a red herring.

    ah, in retrospect i realized that this test had one flaw: some of the
    systems i the build cluster already ran a newer kernel and hence were
    targets for this bug.

    so i turned off CONFIG_TCP_CONG_CUBIC on all the testboxes and rebooted
    the cluster boxes into 2.6.25, and the hung sockets are now gone. (about
    150 successful iterations)

    i did another change as well: i removed the localhost distcc component.
    I'll reinstate that now to make sure it's really related to
    TCP_CONG_CUBIC and not to localhost networking.

    Ingo


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