linux-kernel - Re: x86_64 Question: Are concurrent IPI requests safe?

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Date:	Wed, 11 May 2016 16:33:44 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
cc:	peterz@...radead.org, mingo@...nel.org, akpm@...ux-foundation.org,
	mgorman@...hsingularity.net, mhocko@...nel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: x86_64 Question: Are concurrent IPI requests safe?

On Wed, 11 May 2016, Tetsuo Handa wrote:
> Peter Zijlstra wrote:
> > On Wed, May 11, 2016 at 10:19:16PM +0900, Tetsuo Handa wrote:
> > > [  180.434659] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/31/2013
> > 
> > can you reproduce on real hardware?
> > 
> Unfortunately, I don't have a real hardware to run development kernels.
> 
> My Linux environment is limited to 4 CPUs / 1024MB or 2048MB RAM running
> as a VMware guest on Windows. Can somebody try KVM environment with
> 4 CPUs / 1024MB or 2048MB RAM whith partition only plain /dev/sda1
> formatted as XFS?

Can you trigger a back trace on all cpus when the watchdog triggers?

Thanks,

	tglx