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Date: Thu, 12 Nov 2009 15:36:42 +0200
From: Andriy Gapon <avg@icyb.net.ua>
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To: "S.N.Grigoriev" <serguey-grigoriev@yandex.ru>
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Cc: freebsd-current@freebsd.org, Mark Atkinson <atkin901@yahoo.com>
Subject: Re: 8.0RC2 amd64 - kernel panic running make buildworld
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on 11/11/2009 21:15 S.N.Grigoriev said the following:
> 
> MCA: CPU3 UNCOR PCC OVER DTLIB L1 error
> MCA: Address 0x8015fb000
> 
> 
> Fatal trap 28: machine check trap while in user mode
> 
> Fatal trap 28: machine check trap while in user mode
> cpuid = 3, apic id = 03
> ..... etc.
> 
> 
> I've typed 'panic' at the 'db>' prompt but got no crash dump.
> Tell me please what can I do for further problem investigation.

Serguey,

are you sure that setting vm.pmap.pg_ps_enabled=0 doesn't help you?
I know that already asked you this once.
But, could you please try again with vm.pmap.pg_ps_enabled=0 and hw.mca.enabled=1
and see what kind of behavior you get?
I am curious what would happen, would it be the same kind of machine check condition.

-- 
Andriy Gapon