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Date:	Wed, 24 Dec 2014 08:58:51 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
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>,
	"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 12/23/2014 09:56 AM, 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.
> 
> It's been going for 18 hours, with just a bunch more of those hpet
> messages, all in the same range.  I'll leave it go a few more hours,
> before I have to wipe it, but I've got feel-good vibes about this.
> Even if that patch isn't the solution, It seems like we're finally
> looking in the right direction.

I've got myself a physical server to play with, and running trinity on it
seems to cause similar stalls:

 2338.389210] INFO: rcu_sched self-detected stall on CPU[ 2338.429153] INFO: rcu_sched detected stalls on CPUs/tasks:[ 2338.429164] 	16: (5999 ticks this GP) idle=4b5/140000000000001/0 softirq=24859/24860 last_accelerate: 039d/1b78, nonlazy_posted: 64, ..
[ 2338.429165] 	
[ 2338.680231] 	16: (5999 ticks this GP) idle=4b5/140000000000001/0 softirq=24859/24860 last_accelerate: 039d/1b91, nonlazy_posted: 64, ..
[ 2338.828353] 	 (t=6044 jiffies g=16473 c=16472 q=4915881)

Oddly enough, there's no stacktrace...


Thanks,
Sasha
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