linux-kernel - Re: [QUESTION ON BUG] the rcu stall issue could not be reproduced

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Message-ID: <1342767624.7432.54.camel@marge.simpson.net>
Date:	Fri, 20 Jul 2012 09:00:24 +0200
From:	Mike Galbraith <mgalbraith@...ell.com>
To:	Michael Wang <wangyun@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"paulmck@...ux.vnet.ibm.com" <paulmck@...ux.vnet.ibm.com>,
	mmokrejs@...d.natur.cuni.cz, dan.carpenter@...cle.com
Subject: Re: [QUESTION ON BUG] the rcu stall issue could not be reproduced

On Fri, 2012-07-20 at 11:09 +0800, Michael Wang wrote: 
> Hi, Mike, Martin, Dan
> 
> I'm currently taking an eye on the rcu stall issue which was reported by
> you in the mail:
> 
> rcu: endless stalls
> 	From: Mike Galbraith
> linux-3.4-rc7: rcu_sched self-detected stall on CPU
> 	From: Martin Mokrejs
> RCU stalls in linux-next
> 	From: Dan Carpenter
> 
> I try to reproduce the issue on my X86 server with 12 cpu

The 'endless stalls' box was 341.33333 times larger.  Dunno if you can
even set a serial port slow enough to approximate all cores trying to
gripe through a single pinhole simultaneously.

-Mike

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