linux-kernel - Re: Bisected regression (Was Re: current -git fails to boot on nehalem-ex)

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Message-Id: <67EA4830-231F-45C9-A1A6-CE1C6CD9493D@kernel.org>
Date:	Thu, 10 Dec 2009 09:26:45 -0800
From:	Yinghai <yinghai@...nel.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Bisected regression (Was Re: current -git fails to boot on nehalem-ex)





On Dec 10, 2009, at 8:06 AM, Ingo Molnar <mingo@...e.hu> wrote:

>
> * Jens Axboe <jens.axboe@...cle.com> wrote:
>
>> On Thu, Dec 10 2009, Jens Axboe wrote:
>>> Hi,
>>>
>>> As written in the subject, it just hard hangs before writing  
>>> anything on
>>> the console. With earlyprintk, I captured the failure, see below.
>>>
>>> I'll try and bisect this, but it takes some time (since the bios and
>>> post process takes forever). I just updated the firmware on the  
>>> box as
>>> well, but it did boot 2.6.32 (and RHEL5 boots fine too). Of course  
>>> that
>>> doesn't rule out a BIOS bug.
>>
>> Results are persistent, git bisect points to:
>>
>> commit b24c2a925a9837cccf54d50aeac22ba0cbc15455
>> Author: Yinghai Lu <yinghai@...nel.org>
>> Date:   Tue Nov 24 02:48:18 2009 -0800
>>
>>    x86: Move find_smp_config() earlier and avoid bootmem usage
>>
>> which appears consistent with the panic(). Reverting that does indeed
>> make current -git boot properly.
>
> Thanks. Yinghai, do you have any ideas, or should we revert it?
>
Let find the root cause

Jen

Can you boot with earlyconsole or earlyprintk and debug?

YH
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