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SubjectRe: nmi_watchdog=2 - Oops with 2.6.8
Philippe Elie writes:
> > EIP: 0060: [<0xc0110d4b>] Not tainted
> > EIP is at clear_msr_range+0x18/0x25
> > eax: 0 ebx:1f ecx: 3ba edx: 0
> > esi: 3a0 edi: 1a ebp:0 esp: d7d83f74
> > ds: 7b es: 7b ss: 68
> >
> > Dump of assembler code for function clear_msr_range:
> > 0xc0110d33 <clear_msr_range+0>: push %edi
> > 0xc0110d34 <clear_msr_range+1>: xor %edi,%edi
> > 0xc0110d36 <clear_msr_range+3>: push %esi
> > 0xc0110d37 <clear_msr_range+4>: push %ebx
> > 0xc0110d38 <clear_msr_range+5>: mov 0x14(%esp,1),%ebx
> > 0xc0110d3c <clear_msr_range+9>: mov 0x10(%esp,1),%esi
> > 0xc0110d40 <clear_msr_range+13>: cmp %ebx,%edi
> > 0xc0110d42 <clear_msr_range+15>: jae 0xc0110d54
> > 0xc0110d44 <clear_msr_range+17>: xor %eax,%eax
> > 0xc0110d46 <clear_msr_range+19>: lea (%edi,%esi,1),%ecx
> > 0xc0110d49 <clear_msr_range+22>: mov %eax,%edx
> > 0xc0110d4b <clear_msr_range+24>: wrmsr
>
> Intel removed MSR 0x3ba/0x3bb (MSR_IQ_ESCR0 and 1) in prescott processor
> (family 15 model 3). I'm going to sleep, if nobody beat me I'll try to
> provide a patch, see nmi.c:setup_p4_watchdog() --> clear_msr_range(0x3A0, 31);

I figured that too. Strangely enough, perfctr has been run
successfully on two CPUID 0xF3x machines, and it didn't hit
this problem. I have no idea why, yet. Maybe they haven't
removed IQ_ESCR{0,1} from the Nocona?
I don't have physical access to either a Prescott or a Nocona,
but it it shouldn't be difficult to test. Just set up IQ_ESCR{0,1}
with a clock-like event and see what happens.
/Mikael
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