linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141227025353.GC32271@codemonkey.org.uk>
Date:	Fri, 26 Dec 2014 21:53:54 -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 03:30:20PM -0800, Linus Torvalds wrote:
 > On Fri, Dec 26, 2014 at 2:57 PM, Dave Jones <davej@...emonkey.org.uk> wrote:
 > >
 > > still running though..
 > 
 > Btw, did you ever boot with "tsc=reliable" as a kernel command line option?

I'll check it again in the morning, but before I turn in for the night,
so far the only thing is this:


[ 6713.394395] INFO: rcu_preempt detected stalls on CPUs/tasks:
[ 6713.394489] 	Tasks blocked on level-0 rcu_node (CPUs 0-7):
[ 6713.394513] 	Tasks blocked on level-0 rcu_node (CPUs 0-7):
[ 6713.394536] 	(detected by 3, t=6502 jiffies, g=141292, c=141291, q=0)
[ 6713.394564] INFO: Stall ended before state dump start


	Dave
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