linux-kernel - Re: [Bug #10872] x86_64 boot hang when CONFIG

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Date:	Mon, 7 Jul 2008 17:24:16 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Randy Dunlap" <randy.dunlap@...cle.com>
Cc:	lkml <linux-kernel@...r.kernel.org>, "Ingo Molnar" <mingo@...e.hu>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	"Kernel Testers List" <kernel-testers@...r.kernel.org>
Subject: Re: [Bug #10872] x86_64 boot hang when CONFIG_NUMA=n

On Mon, Jul 7, 2008 at 3:40 PM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> On Mon, 7 Jul 2008 11:39:17 -0700 Randy Dunlap wrote:
>
>> On Mon, 7 Jul 2008 08:32:18 +0200 Ingo Molnar wrote:
>>
>> >
>> > * Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>> >
>> > > > This still happens with 2.6.26-rc9.  Using CONFIG_NUMA=y boots OK.
>> > >
>> > > Ok, then it wasn't the nr_zones thing.
>> > >
>> > > Since it seems to be repeatable for you, can you bisect it?
>> >
>> > one guess would be:
>> >
>> > | commit e8ee6f0ae5cd860e8e6c02807edfa3c1fa01bcb5
>> > | Author: Yinghai Lu <yhlu.kernel@...il.com>
>> > | Date:   Sun Apr 13 01:41:58 2008 -0700
>> > |
>> > |     x86: work around io allocation overlap of HT links
>> >
>> > but ... since CONFIG_NUMA makes it work, i'm not sure about that.
>> >
>> > Randy, could you post the full CONFIG_NUMA bootlog as well, does it show
>> > any difference in resource allocations?
>>
>> Good and bad boot logs are attached.  There are several differences, but I don't
>> see any that are significant.
>>
>> I've started bisecting with:
>>
>> $ git bisect start
>> $ git bisect bad v2.6.26-rc1
>> $ git bisect good v2.6.25
>>
>> That's only about 1.29M lines of changes.
>
> git bisect and normal rebooting did not find a problem.
>
> I'll repeat this using kexec to boot the new kernel and see if that
> locates any issues... since I normally use kexec to load/test new kernels
> and that was how the failure occurred (occurs).
>

same NON-NUMA kernel kexec NON-NUMA kernel?

or other kernel kexex it?

YH
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