Messages in this thread | | | Date | Sat, 4 Oct 2014 22:15:56 -0400 | From | Tejun Heo <> | Subject | Re: RCU stalls -> lockup. |
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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
Thanks.
-- tejun
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