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SubjectRe: PROBLEM: 3.0-rc kernels unbootable since -rc3
> 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

Fantastic, now we boot perfectly!
I also tried the same treatment on v3.0-rc5 and -rc6 (i.e. revert
f8b7fc6b514f34a51875 and a46e0899eec7a3069bcad then add those
8 commits from the jms.2011.07.07a branch) with the same success.

Thanks for giving me back 3.0-rc4, -rc5 and -rc6!

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