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SubjectRe[2]: 3.4-rc smpboot: do_boot_cpu failed(-1) to wakeup CPU#1
..snip..

> >  smpboot: Total of 1 processors activated (4272.42 BogoMIPS)
> >  devtmpfs: initialized
> > I took a guess and got lucky.
> > Reverting "x86/smpboot: Remove APIC.wait_for_init_deassert and atomic init_deasserted" resolved the issue.
>
>
> As a followup, I updated compiler to gcc-5.2 (no help or change).
> I also tried suggested /vmlinuz-4.3.0-rc3 parameter in grub:
>        "cpu_init_udelay=10000"
> which did not help getting missing CPU back online.


Did you try reverting the "x86/smpboot: Remove APIC.wait_for_init_deassert
and atomic init_deasserted"  patch?







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