[Bug 219457] ZFS ARC eviction & system hangup

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219457

            Bug ID: 219457
           Summary: ZFS ARC eviction & system hangup
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: vsasjason at gmail.com

I have a machine with 256 GiB of RAM (249 GiB managed) that serves files over
plain HTTP with nginx & AIO.
After system starup ARC grows to its maximum size - ~233 GiB (so about ten gigs
are always free), then it slightly drops down to ~228 GiB. Only after that if I
start some processes:
1. They will immediately hang in "D" state;
2. pagedaemon/uma enters clearing state;
3. ARC starts to evict till its minimum size;
4. When ARC reaches minimum entire system becomes unresponsive with a delay
(from 5 mins to 8 hours).

Some examples of hanging processes:
1. conftest when building devel/m4 (PR in "See Also");
2. tar on any directory, e.g. tar cvf /dev/null /usr/ports.

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