linux-kernel - Re: Re: [BUG] get_rtc_time() triggers NMI watchdog in hpet_rtc

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Message-ID: <20080826103921.GB10144@elte.hu>
Date:	Tue, 26 Aug 2008 12:39:21 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc:	Vegard Nossum <vegard.nossum@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Re: [BUG] get_rtc_time() triggers NMI watchdog in
	hpet_rtc_interrupt()


* Alan Jenkins <alan-jenkins@...fmail.co.uk> wrote:

> I beat you :-).  I noticed the problem myself.  It does trigger if I 
> run hwclock in a loop.
> 
> while true; do hwclock; done
> 
> However it is fine in latest git.  Looks like Ingo's patch has been 
> merged, and has fixed it.

ah, good - thanks for testing it. I havent seen a lockup on the T60 
either - but it was very sporadic to begin with. (and now we understand 
why: hwclock is running only once per reboot.)

Plus, the real bug has to be found as well: who in the rtc ioctl path 
calls this code with irqs disabled - it's not nice.

	Ingo
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