(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:[email protected]]
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:
> 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>
> ffffffff80532881: 41 0f b6 45 24 movzbl 0x24(%r13),%eax
<<<<<<<<<<< OOPS, %r13 = NULL
> ffffffff80532886: 84 c0 test %al,%al
> ffffffff80532888: 75 11 jne
ffffffff8053289b <dmar_table_init+0x28>
> ffffffff8053288a: 48 c7 c7 b0 3d 45 80 mov
$0xffffffff80453db0,%rdi
> ffffffff80532891: e8 c2 4a cf ff callq
ffffffff80227358 <printk>
> ffffffff80532896: e9 f2 01 00 00 jmpq
ffffffff80532a8d <dmar_table_init+0x21a>
>
> 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
*** Remember to use Documentation/SubmitChecklist when testing your code
***
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