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SubjectRe: 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.


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