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Message-ID: <1A7043D5F58CCB44A599DFD55ED4C9484693770E@fmsmsx115.amr.corp.intel.com>
Date:	Thu, 15 Oct 2015 02:09:30 +0000
From:	"Brown, Len" <len.brown@...el.com>
To:	shrybman <shrybman@...savvy.com>,
	Donald Parsons <dparsons@...ghtdsl.net>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Re[2]: 3.4-rc smpboot: do_boot_cpu failed(-1) to wakeup CPU#1

Donald, Shane,
Thanks for reporting this.

> > 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.

right, if the issue is caused by the patch below,
that cmdline will not help.

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

Yes, please let me know if reverting that patch helps you too.

You have similar hardware:

Shane:

smpboot: CPU0: Intel(R) Core(TM)2 CPU          6400  @ 2.13GHz (fam: 06, model: 0f, stepping: 06)

Donald:

CPU : Intel Core 2 CPU 6600 @ 2.4GHz

I think I can get ahold of a core2 6xxx box tomorrow.
Please send me your .config directly, and I'll see if I can reproduce the issue.

thanks,
-Len

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