linux-kernel - Re: frequent lockups in 3.18rc4

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Date:	Fri, 26 Dec 2014 11:34:10 -0500
From:	Dave Jones <davej@...emonkey.org.uk>
To:	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 Tue, Dec 23, 2014 at 10:01:25PM -0500, Dave Jones wrote:
 > On Mon, Dec 22, 2014 at 03:59:19PM -0800, Linus Torvalds wrote:
 >  
 >  > But in the meantime please do keep that thing running as long as you
 >  > can. Let's see if we get bigger jumps. Or perhaps we'll get a negative
 >  > result - the original softlockup bug happening *without* any bigger
 >  > hpet jumps.
 > 
 > So I've got this box a *little* longer than anticipated.
 > It's now been running 30 hours with not a single NMI lockup.
 > and that's with my kitchen-sink debugging kernel.
 > 
 > The 'hpet off' messages continue to be spewed, and again they're
 > all in the same range of 4293198075 -> 4294967266

In case there was any doubt remaining, it's now been running
3 days, 20 hours with no lockups at all.  I haven't seen it
run this long in months.

Either tomorrow or Sunday I'm finally wiping that box
to give it back on Monday, so if there's anything else
you'd like to try, the next 24hrs are pretty much the only
remaining time I have.

One thing I think I'll try is to try and narrow down which
syscalls are triggering those "Clocksource hpet had cycles off"
messages.  I'm still unclear on exactly what is doing
the stomping on the hpet.

	Dave

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