linux-kernel - Re: [5/6] 2.6.21-rc2: known regressions

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Date:	Mon, 05 Mar 2007 11:14:56 -0500
From:	Bill Davidsen <davidsen@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Adrian Bunk <bunk@...sta.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Emil Karlson <jkarlson@...hut.fi>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	Soeren Sonnenburg <kernel@....de>,
	Daniel Walker <dwalker@...sta.com>
Subject: Re: [5/6] 2.6.21-rc2: known regressions

Ingo Molnar wrote:
> * Adrian Bunk <bunk@...sta.de> wrote:
> 
>> Subject    : i386: no boot with nmi_watchdog=1  (clockevents)
>> References : http://lkml.org/lkml/2007/2/21/208
>> Submitter  : Daniel Walker <dwalker@...sta.com>
>> Caused-By  : Thomas Gleixner <tglx@...utronix.de>
>>              commit e9e2cdb412412326c4827fc78ba27f410d837e6e
>> Handled-By : Thomas Gleixner <tglx@...utronix.de>
>> Status     : problem is being debugged
> 
> FYI, this is not a "wont boot" problem, this should be a "NMI watchdog 
> does not work" problem - which has far lower severity. Also, Thomas did 
> a fix for this which is now in -mm.
> 
If a system normally runs a watchdog, and some do, then nmi would be 
forced on by grub.comf and the system would not boot. And if the system 
was counting on nmi to look for a hanging problem, "nmi does not work" 
would be a real problem if the failure was silent.

Actually, a lack of nmi would be worse than not booting, it would be a 
time bomb waiting for a bad moment to hang.

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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