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Date: Tue, 10 Jul 2007 09:49:30 -0700
From: Randy Dunlap <rdunlap@xenotime.net>
To: Pavel Emelianov <xemul@sw.ru>
Cc: Ashok Raj <ashok.raj@intel.com>, Shaohua Li <shaohua.li@intel.com>,
       Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Andrew Morton <akpm@osdl.org>
Subject: Re: OOPS at dmar_table_init (2.6.22-rc6-mm1 kernel)
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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 ***