Re: 2.6.17-rc1: kernel only boots one CPU on HT system

[Andrew Morton]

Kevin Baradon <kevin.baradon@xxxxxxxxx> wrote:
>
> Hello,
> 
> Starting with kernel 2.6.17-rc1 (also happens with 2.6.17-rc2), second 
> logical-CPU of my Hyperthreading system no longer boots.
> 
> I tracked up changes in APIC code, and it appears reverting commit 
> 7c5c1e427b5e83807fd05419d1cf6991b9d87247 fixes this bug.

That helps heaps, thanks.

> See both dmesgs, and kernel configuration attached.
> 
> Feel free to ask me if you need other informations.
> Please CC me as I'm not subscribed to LKML.
> 
> 
> Hardware : 
> ------------------------------
> MB: Gigabyte GA-8SINXP1394
> CPU: Intel Pentium 4 3.06Ghz HT
> RAM: Corsair 512Mo
> 
> cat /proc/cpuinfo: (patched kernel)
> ------------------------------
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Pentium(R) 4 CPU 3.06GHz
> stepping        : 7
> cpu MHz         : 3081.400
> cache size      : 512 KB
> physical id     : 0
> siblings        : 2
> core id         : 0
> cpu cores       : 1
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
> bogomips        : 6165.74
> 
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Pentium(R) 4 CPU 3.06GHz
> stepping        : 7
> cpu MHz         : 3081.400
> cache size      : 512 KB
> physical id     : 0
> siblings        : 2
> core id         : 0
> cpu cores       : 1
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca 
> cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe cid
> bogomips        : 6162.10
> 
> cat /proc/interrupts :  (patched kernel)
> -----------------------------
>            CPU0       CPU1
>   0:    2143303       6647    IO-APIC-edge  timer
>   1:         15          9    IO-APIC-edge  i8042
>   4:          7          1    IO-APIC-edge  serial
>   8:      19518          1    IO-APIC-edge  rtc
>   9:          0          0   IO-APIC-level  acpi
>  15:      37053         23    IO-APIC-edge  ide1
>  16:     240872          1   IO-APIC-level  cx88[0], eth-lan
>  17:      11128         19   IO-APIC-level  ide2, ide3
>  18:      63432          4   IO-APIC-level  libata, ohci1394, CS46XX
>  19:          0          3   IO-APIC-level  ehci_hcd:usb1
>  20:     457635        195   IO-APIC-level  ohci_hcd:usb2
>  21:          0          0   IO-APIC-level  ohci_hcd:usb3
>  22:          0          0   IO-APIC-level  ohci_hcd:usb4
> NMI:    2149889    2149786
> LOC:    2150122    2150121
> ERR:          0
> MIS:          0
> 

Shaohua, I'll queue up a reversion patch so this doesn't get forgotten
about but I won't send it to Linus at this stage.
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