linux-kernel - Re: [bisected] 2.6.31 regression: fails to boot as xen guest

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Message-ID: <4A9437E4.4060609@nets.rwth-aachen.de>
Date:	Tue, 25 Aug 2009 21:13:40 +0200
From:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	Arnd Hannemann <Arnd.Hannemann@...s.rwth-aachen.de>,
	LKML <linux-kernel@...r.kernel.org>,
	"hannes@...xchg.org" <hannes@...xchg.org>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Ingo Molnar <mingo@...e.hu>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [bisected] 2.6.31 regression: fails to boot as xen guest

Pekka Enberg wrote:
> On Tue, 2009-08-25 at 21:58 +0300, Pekka Enberg wrote:
>> On Tue, 2009-08-25 at 20:22 +0200, Arnd Hannemann wrote:
>>> Pekka Enberg wrote:
>>>> On Tue, 2009-08-25 at 19:49 +0200, Arnd Hannemann wrote:
>>>>> Hi Pekka,
>>>>>
>>>>> Pekka Enberg wrote:
>>>>>> On Tue, 2009-08-25 at 18:49 +0200, Arnd Hannemann wrote:
>>>>>>>> Thanks for doing the bisect! Can we also see your
>>>>>>>> .config also?
>>>>>>> Config for -rc7 is attached. My bisect configs were based
>>>>>>> on that
>>>>>> Thanks! While we wait for the Xen people, you can try the
>>>>>> following patch to see if we can narrow the bug down to
>>>>>> trap_init().
>>>>> Yes seems to be trap_init(). -rc7 with this patch applied
>>>>> boots up to the prompt.
>>>> Thanks for testing! Ingo, what do you think of the following
>>>> patch? AFAICT, x86-32 is the only architecture playing with
>>>> traps in mem_init() so this should be the safest fix for
>>>> 2.6.31.
>>> Hmm, -rc7 + this fix does not work for me :-/ Still hangs before
>>> any output...
>> Arnd, does this work for you?
>
> Here's a version of the patch that actually compiles. :-)

Great, this actually works, too :-)
Boots up to the prompt.

Best regards,
Arnd


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