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Date: Wed, 25 Aug 2004 08:12:48 +0200
From: Philippe Elie <phil.el@wanadoo.fr>
To: Zarakin <zarakin@hotpop.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: nmi_watchdog=2 - Oops with 2.6.8
Message-ID: <20040825061248.GB556@zaniah>
References: <021101c48a44$c8f846e0$6401a8c0@novustelecom.net>
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On Tue, 24 Aug 2004 at 18:42 +0000, Zarakin wrote:

> Hi,
> 
> My Gentoo machine will not boot with nmi_watchdog=2 parameter - I get an
> oops at clear_msr_range.
> 
> Handwritten oops Info:
> CPU 0
> 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);

This probably break oprofile too, patch will be a bit less obvious

regards,
phe