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

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

    > 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.

    ok, once i added back the localhost distcc component and the hung kernel
    build + stuck TCP socket bug happened again overnight:

    Active Internet connections (w/o servers)
    Proto Recv-Q Send-Q Local Address Foreign Address State
    tcp 72187 0 10.0.1.14:3632 10.0.1.14:47910 ESTABLISHED
    tcp 0 174464 10.0.1.14:47910 10.0.1.14:3632 ESTABLISHED

    so it seems distcc over localhost was the aspect that made it fail.

    _Perhaps_ what matters is to have the new post-rc3 TCP code on _both_
    sides of the connection. But that is just a theory - it could be timing,
    etc.

    Ingo


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