[Bug 230187] Hardware clock freezes until ntpd is killed on 11.1-RELEASE-p0

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230187

            Bug ID: 230187
           Summary: Hardware clock freezes until ntpd is killed on
                    11.1-RELEASE-p0
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: danmcgrath.ca at gmail.com

Created attachment 195628
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195628&action=edit
dmesg output and example ntp related tests

I have a Dell Poweredge 410 that seems to be having some clock problems. I have
noticed the occasional interruptions in Zabbix charts in the past on previous
FreeBSD versions, but since upgrading to 11.2-p0, the problem has gotten to the
point where the clock freezes entirely and blocks disk IO and various
processes. Even the "data" command refuses to increment (see attached file).

I can probably stop ntpd entirely, but it would be nice to get some possible
debug type commands to run so that I can try get to the bottom of why ntpd is
stopping the clock on this one server. I used to have LOCAL(0) stratum 10 local
source enabled, but disabling this had no effect.

I'm open to suggestions! Thanks.

=====
FreeBSD hostname.tld 11.2-RELEASE FreeBSD 11.2-RELEASE #0 r335856: Mon Jul  2
13:27:01 CEST 2018     root at hostname.tld:/usr/obj/usr/src/sys/ALTQ  amd64

(the ALTQ kernel runs on a half dosen other machines on 11.2 as well)

#> less ~/kernels/ALTQ 
#
# ALTQ -- Based on Generic kernel configuration file for FreeBSD/amd64
#
include         GENERIC

# ALTQ support -- troubled
options         ALTQ                    # Enable ALTQ
options         ALTQ_CBQ        # Build the ``Class Based Queuing'' discipline
options         ALTQ_RED        # Build the ``Random Early Detection''
extension
options         ALTQ_RIO        # Build ``Random Early Drop'' for input and
output
options         ALTQ_HFSC       # Build the ``Hierarchical Packet Scheduler''
discipline
options         ALTQ_PRIQ       # Build the ``Priority Queuing'' discipline

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