linux-kernel - Re: Bug on 2.6.26 - x86 VIA Nehemiah CentaurHauls processor cannot boot

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Date:	Mon, 21 Jul 2008 06:23:43 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Luis R. Rodriguez" <mcgrof@...il.com>
CC:	linux kernel <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...nel.org>,
	Ivan Seskar <Seskar@...lab.rutgers.edu>,
	jfm3 <jfm3@...lab.rutgers.edu>, Sujith <m.sujith@...il.com>
Subject: Re: Bug on 2.6.26 - x86 VIA Nehemiah CentaurHauls processor cannot
 boot

Luis R. Rodriguez wrote:
> This bug seems to be present since 2.6.22 [1], so hope we can get this
> fixed ASAP. Let me know if you have patch suggestions I can test.
> 
> This crashes very early, I had to use earlyprintk to get it.
> 
> BUG: Int 6: CR2 00000000
>      EDI 00000000  ESI 0009f000  EBP 00000000  ESP c036ff60
>      EBX c03e6070  EDX 00000006  ECX 0000009f  EAX c034d240
>      err 00000000  EIP c0387ac2   CS 00000060  flg 00010016
> Stack: 00000000 00000000 c03b63d8 c037bb11 0001dff0 00003c00 c0399614 c03b6304
>        00822007 c037aeb4 c0304134 000001df c0304117 00000000 30303030 205d3030
>        00000000 c034c794 00000000 00000000 00822007 c02b921f c034c794 00000000
> [    0.000000] Pid: 0, comm: swapper Not tainted 2.6.26 #1

Use objdump -d or something to find out what is at 0xc0387ac2; the error 
is an undefined instruction exception.

I suspect this is another case of a processor reporting family == 6 and 
not providing the 0F 1F NOP opcodes.

	-hpa
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