linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Fri, 26 Dec 2014 15:16:41 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Dave Jones <davej@...emonkey.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, 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>,
	Suresh Siddha <sbsiddha@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Anvin <hpa@...ux.intel.com>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: frequent lockups in 3.18rc4

On Fri, Dec 26, 2014 at 2:57 PM, Dave Jones <davej@...emonkey.org.uk> wrote:
>
> hm.

So with the previous patch that had the false positives, you never saw
this? You saw the false positives instead?

I'm wondering if the added debug noise just ended up helping. Doing a
printk() will automatically cause some scheduler activity. And they
also caused the time reading jiggle.

That said, it's also possible that I screwed something up in the
second version of the patch, just breaking it and making it generally
ineffective.

Oh - and have you actually seen the "TSC unstable (delta = xyz)" +
"switched to hpet" messages there yet?

                         Linus
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