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Date: Fri, 9 Jul 2010 21:52:02 +0200
From: Conny Seidel <conny.seidel@amd.com>
To: Yinghai Lu <yinghai@kernel.org>
CC: "Petkov, Borislav" <Borislav.Petkov@amd.com>, Ingo Molnar <mingo@elte.hu>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>
Subject: Re: unable to handle kernel paging request at 40000000
 __alloc_memory_core_early+0x147/0x1d6
Message-ID: <20100709215202.4be679a8@marah.osrc.amd.com>
In-Reply-To: <4C3773C4.1010609@kernel.org>
References: <20100709145415.GC11199@aftab>
	<4C3773C4.1010609@kernel.org>
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Hi,

On Fri, 9 Jul 2010 15:08:52 -0400
Yinghai Lu <yinghai@kernel.org> wrote:

>On 07/09/2010 07:54 AM, Borislav Petkov wrote:
>> Hi,
>>
>> this is something we're getting during testing on one of our boxes
>> here, a dual socket Magny-Cours machine. It is oopsing on the addr
>> variable in __alloc_memory_core_early() after converting it to a
>> virtual address in order to clear the mem region at it. I've removed
>> the "#if 0.. #endif" around the printk which dumps the ranges in the
>> early node map for more info.
>>
>> It's latest -git, 32bit build, config is attached.
>>
>
>can not duplicate on all my setup.
>
>but look at the code there is limit problem with 32 bit...
>
>please check if it will fix the problem.
>
>and we will need to rebase early_res to memblock patchset.
>
>Thanks
>
>Yinghai Lu
>

I'm sorry but the patch isn't working.

Now we are seeing this:

[    0.000000] BUG: Int 6: CR2 (null)
[    0.000000]      EDI 00000005  ESI f3e00800  EBP c21afed4  ESP c21afe90
[    0.000000]      EBX 01000000  EDX 00000006  ECX (null)  EAX fffffff4
[    0.000000]      err (null)  EIP c2359558   CS 00000060  flg 00010046
[    0.000000] Stack: fffffff4 (null) 00000001 f3e00000 00000005 00080000 0=
0000001 00000002
[    0.000000]        000b6800 00000002 f3e00000 00000001 00000002 c21aff0c=
 c2359dd2 (null)
[    0.000000]        ffe00000 00000004 (null) 00000004 001fafd8 c2943000 (=
null) 00004e00
[    0.000000] Pid: 0, comm: swapper Not tainted 2.6.35-rc4+ #1
[    0.000000] Call Trace:
[    0.000000]  [<c1dd39d9>] hlt_loop+0x0/0x3
[    0.000000]  [<c2359558>] ? free_area_init_node+0x5b1/0x647
[    0.000000]  [<c2359dd2>] free_area_init_nodes+0x7b5/0x89a
[    0.000000]  [<c234a2c9>] paging_init+0x1a9/0x1cc
[    0.000000]  [<c2330325>] setup_arch+0x1414/0x15f7
[    0.000000]  [<c23510c1>] ? __reserve_early+0x119/0x135
[    0.000000]  [<c1078c8a>] ? printk+0x36/0x54
[    0.000000]  [<c232917b>] start_kernel+0x1d0/0xb6f
[    0.000000]  [<c2328163>] i386_start_kernel+0x163/0x179


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