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Date: Thu, 23 Oct 2014 15:37:59 -0400 From: Dave Jones <davej@...hat.com> To: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> Cc: Linux Kernel <linux-kernel@...r.kernel.org>, htejun@...il.com, oleg@...hat.com Subject: Re: rcu_preempt detected stalls. On Thu, Oct 23, 2014 at 12:28:07PM -0700, Paul E. McKenney wrote: > > > This one will require more looking. But did you do something like > > > create a pair of mutually recursive symlinks or something? ;-) > > > > I'm not 100% sure, but this may have been on a box that I was running > > tests on NFS. So maybe the server had disappeared with the mount > > still active.. > > > > Just a guess tbh. > > Another possibility might be that the box was so overloaded that tasks > were getting preempted for 21 seconds as a matter of course, and sometimes > within RCU read-side critical sections. Or did the box have ample idle > time? I fairly recently upped the number of child processes I typically run with, so it being overloaded does sound highly likely. 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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