Strange ARC/Swap/CPU on yesterday's -CURRENT

[Peter Jeremy]

On 2018-Mar-11 10:43:58 -1000, Jeff Roberson <jroberson at jroberson.net> wrote:
>Also, if you could try going back to r328953 or r326346 and let me know if 
>the problem exists in either.  That would be very helpful.  If anyone is 
>willing to debug this with me contact me directly and I will send some 
>test patches or debugging info after you have done the above steps.

I ran into this on 11-stable and tracked it to r326619 (MFC of r325851).
I initially got around the problem by reverting that commit but either
it or something very similar is still present in 11-stable r331053.

I've seen it in my main server (32GB RAM) but haven't managed to reproduce
it in smaller VBox guests - one difficulty I faced was artificially filling
ARC.

-- 
Peter Jeremy
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