linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141227164848.GA13844@codemonkey.org.uk>
Date:	Sat, 27 Dec 2014 11:48:48 -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 07:14:55PM -0800, Linus Torvalds wrote:
 > On Fri, Dec 26, 2014 at 4:36 PM, Dave Jones <davej@...emonkey.org.uk> wrote:
 > >  >
 > >  > Oh - and have you actually seen the "TSC unstable (delta = xyz)" +
 > >  > "switched to hpet" messages there yet?
 > >
 > > not yet. 3 hrs in.
 > 
 > Ok, so then the
 > 
 >      INFO: rcu_preempt detected stalls on CPUs/tasks:
 > 
 > has nothing to do with HPET, since you'd still be running with the TSC enabled.

right. 16hrs later, that's the only thing that's spewed.

 > My googling around did find a number of "machine locks up a few hours
 > after switching to hpet" reports, so it is possible that the whole rcu
 > stall and nmi watchdog thing is independent and unrelated to the
 > actual locking up.

possible.  I'm heading home in a few hours to start the wipe of that
box. This is going to be 'the one that got away', but at least we've
managed to find a number of other things that needed fixing along the way.

	Dave
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