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

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Date:	Tue, 8 Jul 2008 00:07:03 -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 10:28 PM, Randy Dunlap <randy.dunlap@...cle.com> wrote:
> On Mon, 7 Jul 2008 17:24:16 -0700 Yinghai Lu wrote:
>
>> 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?
>
> Ah.  Good question.  I hadn't noticed that.
> NUMA kernel kexec-ing a non-NUMA kernel now fails, but it worked in 2.6.25.
>

can you resend out that two config?

YH
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