linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141204002044.GA15239@redhat.com>
Date:	Wed, 3 Dec 2014 19:20:44 -0500
From:	Dave Jones <davej@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: frequent lockups in 3.18rc4

On Thu, Dec 04, 2014 at 12:49:29AM +0100, Thomas Gleixner wrote:

 > > I just got 
 > > 
 > > [ 1472.614433] Clocksource tsc unstable (delta = -26373048906 ns)
 > > 
 > > without any sign of the pr_err above.
 > 
 > Bah. Would have been too simple ....
 > 
 > Could you please run Ingos time-warp test on that machine for a while?
 > 
 >    http://people.redhat.com/mingo/time-warp-test/time-warp-test.c
 > 
 > Please change:
 > 
 > - #define TEST_CLOCK 0
 > + #define TEST_CLOCK 1

Seems to be 32-bit only, so I built it with -m32. I assume that's ok?

Also, should I run it in isolation, with nothing else going on,
or under load where I see problems ?

	Dave
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