linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Wed, 3 Dec 2014 11:48:55 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: frequent lockups in 3.18rc4

On Wed, Dec 3, 2014 at 11:25 AM, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I don't know. This piece of code:
>
>         delta = clocksource_delta(wdnow, cs->wd_last, watchdog->mask);
>
> makes no sense to me.

Yeah, no, I see what's up. I missed that whole wd_last vs cs_last
pairing. I guess that part is all good. There are other crazy issues
in there, though, like the double test of 'watchdog_reset_pending'. So
I still wonder, though, since that odd 96-second delta is just insane
and makes no sense from a TSC standpoint (it's closer to a 32-bit
overflow of a hpet counter, but that sounds off too).

                 Linus
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