Re: 3.4-rc smpboot: do_boot_cpu failed(-1) to wakeup CPU#1

[Donald Parsons]

On Wed, 2015-10-14 at 12:20 -0400, shrybman wrote:
> All 3.4-rc kernels I have tried displayed this issue.

> This report looks similar https://lkml.org/lkml/2015/9/26/165.
> I also have a Core 2 cpu on a Asus P5B (not deluxe) board.

> ...
>  ACPI: Core revision 20150818
>  ACPI: 1 ACPI AML tables successfully acquired and loaded
>  Mount-cache hash table entries: 8192 (order: 4, 65536 bytes)
>  Mountpoint-cache hash table entries: 8192 (order: 4, 65536 bytes)
>  CPU: Physical Processor ID: 0
>  CPU: Processor Core ID: 0
>  mce: CPU supports 6 MCE banks
>  CPU0: Thermal monitoring enabled (TM2)
>  process: using mwait in idle threads
>  Last level iTLB entries: 4KB 128, 2MB 4, 4MB 4
>  Last level dTLB entries: 4KB 256, 2MB 0, 4MB 32, 1GB 0
>  Freeing SMP alternatives memory: 20K (ffffffff819b5000 - ffffffff819ba000)
>  ftrace: allocating 18583 entries in 73 pages
>  ..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
>  smpboot: CPU0: Intel(R) Core(TM)2 CPU          6400  @ 2.13GHz (fam: 06, model: 0f, stepping: 06)
>  Performance Events: PEBS fmt0-, 4-deep LBR, Core2 events, Intel PMU driver.
>  perf_event_intel: PEBS disabled due to CPU errata
>  ... version:                2
>  ... bit width:              40
>  ... generic registers:      2
>  ... value mask:             000000ffffffffff
>  ... max period:             000000007fffffff
>  ... fixed-purpose events:   3
>  ... event mask:             0000000700000003
>  x86: Booting SMP configuration:
>  .... node  #0, CPUs:      #1
>  smpboot: do_boot_cpu failed(-1) to wakeup CPU#1
>  x86: Booted up 1 node, 1 CPUs
>  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.

So all linux-4.3.0-rc[15] lose the second CPU core.

Don


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