linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141227003636.GA32271@codemonkey.org.uk>
Date:	Fri, 26 Dec 2014 19:36:36 -0500
From:	Dave Jones <davej@...emonkey.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	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 03:16:41PM -0800, Linus Torvalds wrote:
 > 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?
 
correct.

 > 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?

not yet. 3 hrs in.

	Dave
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