linux-kernel - Re: [sched/preempt] INFO: rcu_sched self-detected stall on CPU { 1}

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Date:	Wed, 12 Feb 2014 06:28:21 +0000
From:	Bockholdt Arne <a.bockholdt@...citec-optronik.de>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Fengguang Wu <fengguang.wu@...el.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [sched/preempt] INFO: rcu_sched self-detected stall on CPU { 1}


On Thu, 2014-02-06 at 13:19 +0100, Peter Zijlstra wrote: 
> On Thu, Feb 06, 2014 at 12:08:54PM +0000, Bockholdt Arne wrote:
> > This on a a Intel Rangeley Silvermont Atom 8 core machine running kernel
> > 3.13.1/i386 as KVM host with several KVM guests. Tested with the same
> > configuration on kernel 3.12.9 and 3.11.6 without the stall. The stall
> > is 100% reproducible when the KVM guests are under load.
> > Kernel 3.13.1 does NOT contain the patch below AFAIK.
> 
> 3.13 doesn't include 8cb75e0c4ec9786b81439761eac1d18d4a931af3 either.
> 
> can you try a recent linux.git? Also, can you test with a 64bit kernel
> too?

Sorry for the delay, I had some problems with the new
CONFIG_RANDOMIZE_BASE option, it won't work on my i386 setup with
modules loading. 

Anyway, the problem with the RCU stalls still remain with 3.14-rc2, see
dmesg output attached, still the same freezes like kernel 3.13.2.
Haven't tested it with a amd64 kernel yet.

Regards,

    Arne

View attachment "rcu-stall-dmesg-3.14-rc2.txt" of type "text/plain" (109654 bytes)