Re: [boot crash] Re: [tip:x86/mce3] x86, mce: use 64bit machinecheck code on 32bit

[Ingo Molnar]

* Hidetoshi Seto <seto.hidetoshi@xxxxxxxxxxxxxx> wrote:

> Hi Ingo,
> 
> Ingo Molnar wrote:
> > * tip-bot for Andi Kleen <ak@xxxxxxxxxxxxxxx> wrote:
> > 
> >> Commit-ID:  4efc0670baf4b14bc95502e54a83ccf639146125
> >> Gitweb:     http://git.kernel.org/tip/4efc0670baf4b14bc95502e54a83ccf639146125
> >> Author:     Andi Kleen <ak@xxxxxxxxxxxxxxx>
> >> AuthorDate: Tue, 28 Apr 2009 19:07:31 +0200
> >> Committer:  H. Peter Anvin <hpa@xxxxxxxxx>
> >> CommitDate: Thu, 28 May 2009 09:24:13 -0700
> >>
> >> x86, mce: use 64bit machine check code on 32bit
> 
> (snip)
> 
> > 
> > This commit causes a new regression, it broke the bootup on one of 
> > my -tip testsystems, an older, Pentium-M based HP laptop (HP 
> > OmniBook 6000 EA).
> > 
> > The symptom is that the bootup hard-hangs after MCE init:
> > 
> >  [    0.022996] Mount-cache hash table entries: 512
> >  [    0.024996] Initializing cgroup subsys debug
> >  [    0.025996] Initializing cgroup subsys cpuacct
> >  [    0.026995] Initializing cgroup subsys devices
> >  [    0.027995] Initializing cgroup subsys freezer
> >  [    0.028995] mce: CPU supports 5 MCE banks
> > 
> > Kernel config attached. cpuinfo:
> > 
> > processor	: 0
> > vendor_id	: GenuineIntel
> > cpu family	: 6
> > model		: 8
> > model name	: 06/08
> > stepping	: 10
> > cpu MHz		: 846.372
> 
> According to the cpuid, I suppose this cpu is Pentium III.

yep.

> > 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 sep mtrr pge mca cmov pat pse36 mmx fxsr sse up
> 
> None of acpi, apic, and tm is available.
> So at least thermal codes should be innocent.

yes.

> > bogomips	: 1692.74
> > clflush size	: 32
> > power management:
> > 
> > 	Ingo
> 
> Could you try boot your laptop with mce=nobootlog?

Hm, why should that make any difference? mce=nobootlog only 
influences whether we pass records into the mcelog buffer but does 
not affect whether we touch the hardware.

	Ingo
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