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

[Rodney W. Grimes]

> On Mon, 5 Mar 2018 14:39-0600, Larry Rosenman wrote:
> 
> > Upgraded to:
> > 
> > FreeBSD borg.lerctr.org 12.0-CURRENT FreeBSD 12.0-CURRENT #11 r330385: Sun Mar  4 12:48:52 CST 2018     root at borg.lerctr.org:/usr/obj/usr/src/amd64.amd64/sys/VT-LER  amd64
> > +1200060 1200060
> > 
> > Yesterday, and I'm seeing really strange slowness, ARC use, and SWAP use and swapping.
> > 
> > See http://www.lerctr.org/~ler/FreeBSD/Swapuse.png
> 
> I see these symptoms on stable/11. One of my servers has 32 GiB of 
> RAM. After a reboot all is well. ARC starts to fill up, and I still 
> have more than half of the memory available for user processes.
> 
> After running the periodic jobs at night, the amount of wired memory 
> goes sky high. /etc/periodic/weekly/310.locate is a particular nasty 
> one.

I would like to find out if this is the same person I have
reporting this problem from another source, or if this is
a confirmation of a bug I was helping someone else with.

Have you been in contact with Michael Dexter about this
issue, or any other forum/mailing list/etc?  

If not then we have at least 2 reports of this unbound
wired memory growth, if so hopefully someone here can
take you further in the debug than we have been able
to get.

> 
> Limiting the ARC to, say, 16 GiB, has no effect of the high amount of 
> wired memory. After a few more days, the kernel consumes virtually all 
> memory, forcing processes in and out of the swap device.

Our experience as well.

...

Thanks,
-- 
Rod Grimes                                                 rgrimes at freebsd.org