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    SubjectRe: PROBLEM: 3.0-rc kernels unbootable since -rc3
    On Sun, Jul 10, 2011 at 10:16:26AM -0700, Paul E. McKenney wrote:
    > On Sun, Jul 10, 2011 at 05:38:25PM +0100, julie Sullivan wrote:
    > > > I added another patch onto the jms.2011.07.07a in the -rcu git tree.
    > > > If you get a chance to test it, please let me know how it goes.
    > > >
    > > >                                                        Thanx, Paul
    > >
    > >
    > > Right, adding this commit to the other six:
    > >
    > > commit 8a153670878242b8a95213d986f4922111321743
    > >
    > > makes us freeze on boot again.
    > Thank you again for the testing! This one will take some thought...

    But maybe not that much thought. My current guess is that your
    configuration is somehow causing some RCU callbacks to be executed
    during early boot, and that these callbacks are attempting to use kernel
    features that are not yet initialized. If my guess is correct, then
    the reason that enabling RCU_BOOST makes things work is that it prevents
    RCU callbacks from executing until after the scheduler is up and running.

    So I added another commit to the jms.2011.07.07a branch in the -rcu
    git tree. If my guesses are correct, this will allow your system to
    boot, possibly emitting a warning on the way up. When you get a chance
    to try this out, please let me know how it goes.

    Thanx, Paul
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