[Bug 248367] /sbin/ping fails when run many times simultaneously

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248367

            Bug ID: 248367
           Summary: /sbin/ping fails when run many times simultaneously
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: dseliv at gmail.com

How to repeat
# uname -a
FreeBSD r 12.1-RELEASE-p5 FreeBSD 12.1-RELEASE-p5 GENERIC  amd64

Run this line some times:

# sh -c 'for i in $(seq 100); do ping -c1 127.0.0.1 >/dev/null & done; wait'

It runs 100 ping processes in parallel. Sometimes some of them fail and produce
such output:

ping: unable to limit access to system.dns service: Socket is not connected

That command is synthetic. In my real system I have this message even for 20
processes run to ping different hosts.

The bug also presents in 11.4-RELEASE-p1.

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