[Bug 275594] High CPU usage by arc_prune; analysis and fix

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275594

--- Comment #66 from Peter Much <pmc@citylink.dinoex.sub.org> ---
(In reply to Seigo Tanimura from comment #64)
They are from the official distribution 6c2137593990 (plus local fixes):

FreeBSD disp.***** 13.3-BETA1 FreeBSD 13.3-BETA1[0d65a8c79a4a=6c2137593990+27]
D6R13V1 amd64

This installation comes from a deploy engine, we're usually not building
locally.
(To build locally means to start a test case, and to do so I must first get rid
of my currently open test case, otherwise I do no longer know what exactly was
changed where. This is why things proceed slowly here - I usually do root cause
analysis.)

I am mainly worried about the endless loop. An endless loop in kernel thread
MUST NOT happen (for whatever reason), because it cannot be contained with
rctl(8); it will keep cpu at max and may bring thermal load steering into
disarray.

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