linux-kernel - Re: [PATCH 0/5] kdump: extract log buffer and registers from vmcore on NMI button pressing

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Message-ID: <20100604101639.GB24794@basil.fritz.box>
Date:	Fri, 4 Jun 2010 12:16:39 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Américo Wang <xiyou.wangcong@...il.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Vitaly Mayatskikh <v.mayatskih@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Randy Dunlap <rdunlap@...otime.net>
Subject: Re: [PATCH 0/5] kdump: extract log buffer and registers from
	vmcore on NMI button pressing

On Fri, Jun 04, 2010 at 05:49:36PM +0800, Américo Wang wrote:
> On Thu, Jun 03, 2010 at 05:13:47PM +0200, Andi Kleen wrote:
> >> > NMI would be only needed if the crash kernel is completely
> >> > hosed too.
> >> 
> >> That's the case.
> >
> >You're saying it booted but is hosed after boot?
> >
> >That seems like a very obscure case. Is that really common?
> >
> 
> Actually, I met two of this kind of cases recently.
> 
> One was stucked in early_idt_hander() during booting the second kernel,

Most likely screaming interrupt from some device.

I have some ideas how to improve this by more forcefully resetting
devices on kexec, but in general perhaps early idt needs to be hardened for 
this case too.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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