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Message-ID: <20141007012744.GA25036@redhat.com> Date: Mon, 6 Oct 2014 21:27:44 -0400 From: Dave Jones <davej@...hat.com> To: Tejun Heo <tj@...nel.org> Cc: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: RCU stalls -> lockup. On Sat, Oct 04, 2014 at 10:15:56PM -0400, Tejun Heo wrote: > 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? > > http://lkml.kernel.org/r/20141003153701.7c7da030@jlaw-desktop.mno.stratus.com initial tests look good, haven't seen any reoccurance of the problem so far. Dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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