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Date:	Sat, 4 Oct 2014 22:15:56 -0400
From:	Tejun Heo <>
To:	"Paul E. McKenney" <>
Cc:	Dave Jones <>,
	Linux Kernel <>
Subject: Re: RCU stalls -> lockup.

On Thu, Oct 02, 2014 at 12:36:55PM -0700, Paul E. McKenney wrote:
> On Thu, Oct 02, 2014 at 01:55:15PM -0400, Dave Jones wrote:
> > I just hit this on my box running 3.17rc7
> > It was followed by a userspace lockup. (Could still ping, and sysrq
> > from the console, but even getty wasn't responding on the console).
> > 
> > I was trying to reproduce another bug faster, and had ramped up the
> > number of processes trinity to uses to 512. This didn't take long
> > to fall out..
> This might be related to an exchange I had with Tejun (CCed), where
> the work queues were running all out, preventing any quiescent states
> from happening.  One fix under consideration is to add a quiescent state,
> similar to the one in softirq handling.

Dave, can you please test whether the following patch makes a
difference if the problem is reproducible?


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