(Sorry for the top post) 

This bug is fixed and the fix should appear in the next MM release.
See this link for the patch
http://marc.info/?l=linux-kernel&m=118313130109808&w=2 

-Anil
-----Original Message-----
From: Randy Dunlap [mailto:rdunlap@xenotime.net] 
Sent: Tuesday, July 10, 2007 9:50 AM
To: Pavel Emelianov
Cc: Raj, Ashok; Li, Shaohua; Keshavamurthy, Anil S; Linux Kernel Mailing
List; Andrew Morton
Subject: Re: OOPS at dmar_table_init (2.6.22-rc6-mm1 kernel)

On Tue, 10 Jul 2007 17:57:25 +0400 Pavel Emelianov wrote:

quoted text
> Hi.
> 
> While working with Andrew's kernel I faced an OOPS on x86_64 
> machine. Unfortunately kernel logs are not appearing in serial 
> console by the time oops happens, but I have some info on the
> screen:
> 
> OOPs is at dmar_table_init() here:
> ffffffff80532873 <dmar_table_init>:
> ffffffff80532873:       41 55                   push   %r13
> ffffffff80532875:       41 54                   push   %r12
> ffffffff80532877:       55                      push   %rbp
> ffffffff80532878:       53                      push   %rbx
> ffffffff80532879:       51                      push   %rcx
> ffffffff8053287a:       4c 8b 2d 07 21 01 00    mov
73991(%rip),%r13        # ffffffff80544988 <dmar_tbl>
quoted text
> ffffffff80532881:       41 0f b6 45 24          movzbl 0x24(%r13),%eax
<<<<<<<<<<< OOPS, %r13 = NULL
quoted text
> ffffffff80532886:       84 c0                   test   %al,%al
> ffffffff80532888:       75 11                   jne
ffffffff8053289b <dmar_table_init+0x28>
quoted text
> ffffffff8053288a:       48 c7 c7 b0 3d 45 80    mov
$0xffffffff80453db0,%rdi
quoted text
> ffffffff80532891:       e8 c2 4a cf ff          callq
ffffffff80227358 <printk>
quoted text
> ffffffff80532896:       e9 f2 01 00 00          jmpq
ffffffff80532a8d <dmar_table_init+0x21a>
quoted text
> 
> Looks like dmar_tbl is NULL. 
> BUG is 100% reproducible. Is there any other info that can be useful?

You could test the patch from
http://lkml.org/lkml/2007/6/29/174 (see "Get diff 1").


---
~Randy
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