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    SubjectRe: 2.6.26-rc9-git4: Reported regressions from 2.6.25

    * Ingo Molnar <> wrote:

    > cool! :)
    > (hm, could anyone please resend Nick's original mail? The original one
    > is not in my lkml folder nor on - only the quoted one.)

    ok, got the mail now now:

    | | Annoyed this wasn't a crazy obscure error in the algorithm I could
    | | fix :) [...]

    Paul recently ran a formal proof against all sorts of RCU details (and
    found and fixed a few obscure races that way that no-one ever
    triggered), so i'd be quite surprised if we found anything in the core
    algorithm :-)

    | | [...] I spent all day debugging it and had to make a special test
    | | case (rcutorture didn't seem to trigger it), and a big RCU state
    | | logging infrastructure to log millions of RCU state transitions and
    | | events. Oh well.

    nice debugging!

    Acked-by: Ingo Molnar <>

    i'm wondering why rcutorture didnt trigger it. I do run !HOTPLUG +
    RCU_PREEMPT kernels and never saw this. Nor did Paul. That aspect is


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