[Bug 279950] dns/nsd: nonresponsive, 100% cpu, can't be stopped short of kill -9

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279950

            Bug ID: 279950
           Summary: dns/nsd: nonresponsive, 100% cpu, can't be stopped
                    short of kill -9
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: bob@vesterman.com
                CC: jaap@NLnetLabs.nl
                CC: jaap@NLnetLabs.nl
             Flags: maintainer-feedback?(jaap@NLnetLabs.nl)

I recently updated dns/nsd (to version 4.10 on 13.3-RELEASE-p3), and now it
just doesn't respond to requests (neither DNS lookups nor "service nsd stop").

I've noticed that there are actually two nsd processes with different names,
main and xfrd:

# ps aux -ww | grep nsd
nsd         2552  99.9  0.1   50156  38700  -  R    10:00       0:29.78 nsd:
main (nsd)
nsd         2094   0.0  0.0   68952   9404  -  Is   10:00       0:00.07 nsd:
xfrd (nsd)

Both of these start up whenever I do a "service start nsd". I don't remember
ever having seen xfrd before, though I imagine I could've easily overlooked it
in the past.

As you can see, the "main" is running at or near 100% CPU; this seems to
continue forever (hours, at the very least).

I have rebooted, I have uninstalled/reinstalled,
uninstalled/rebuilt/reinstalled, and even uninstalled/rebuilt absolutely
everything/reinstalled. Nothing I've tried so far has helped.

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