Hi,

Did you see anything interesting in the ntpd log file around the time the large 
skew happened?

Best
Neel

> On Apr 13, 2016, at 3:44 AM, Ilario Febi <if...@schema31.it> wrote:
> 
> Hi All
> 
> I have a strange issue about the clock of some FreeBSD Bhyve guests,
> maybe someone of you can help me to diagnose it and work on a
> solution.
> 
> In detail, sometimes (without an apparent regularity) one of four
> bhyve guest's clock goes exactly 7 minutes and 10 seconds in the
> future.
> 
> This clock stays unaligned for about 20 minutes, then, without any
> human intervention, the clock realign to proper condition.
> 
> My configuration is:
> 
> envrm02 (bhyve HOST, 10.2-RELEASE-p14)
> -> og-qa (bhyve guest - 10.2-RELEASE-p14)
> -> og-ci (bhyve guest - 10.2-RELEASE-p14)
> -> og-test (bhyve guest - 10.2-RELEASE-p14)
> -> og-prod-rm (bhyve guest - 10.2-RELEASE-p14)
> All the og-* machines just have a running copy of tomcat.
> 
> I built a simple test to catch the error with python/fabric... the test is:
> 
> fab -R ENV,OG,OG-PROD -- date | awk -F ': ' '/2016/{print $2, $1}'
> 
> which simply run the command "date" on all hosts.
> 
> So, the result is:
> @Mac-mini ~/p/f/> ./check_clock.sh
> Thu Apr  7 17:38:00 CEST 2016 [envrm02] out
> Thu Apr  7 17:38:00 CEST 2016 [og-qa] out
> Thu Apr  7 17:38:00 CEST 2016 [og-ci] out
> Thu Apr  7 17:38:00 CEST 2016 [og-test] out
> Thu Apr  7 17:38:00 CEST 2016 [og-prod-rm] out
> 
> @Mac-mini ~/p/f/> ./check_clock.sh
> Thu Apr  7 18:38:00 CEST 2016 [envrm02] out
> Thu Apr  7 18:45:10 CEST 2016 [og-qa] out
> Thu Apr  7 18:38:00 CEST 2016 [og-ci] out
> Thu Apr  7 18:38:00 CEST 2016 [og-test] out
> Thu Apr  7 18:38:00 CEST 2016 [og-prod-rm] out
> 
> @Mac-mini ~/p/f/> ./check_clock.sh
> Thu Apr  7 18:41:05 CEST 2016 [envrm02] out
> Thu Apr  7 18:48:15 CEST 2016 [og-qa] out
> Thu Apr  7 18:41:05 CEST 2016 [og-ci] out
> Thu Apr  7 18:41:05 CEST 2016 [og-test] out
> Thu Apr  7 18:41:05 CEST 2016 [og-prod-rm] out
> 
> @Mac-mini ~/p/f/> ./check_clock.sh
> Thu Apr  7 18:46:51 CEST 2016 [envrm02] out
> Thu Apr  7 18:46:52 CEST 2016 [og-qa] out
> Thu Apr  7 18:46:52 CEST 2016 [og-ci] out
> Thu Apr  7 18:46:53 CEST 2016 [og-test] out
> Thu Apr  7 18:46:53 CEST 2016 [og-prod-rm] out
> 
> The configuration is the same for all hosts and is this:
> @Mac-mini ~/p/f/> fab -R ENV,OG,OG-PROD -- cat /etc/rc.conf | grep ntpd
> [envrm02] out: ntpd_enable="YES"
> [og-qa] out: ntpd_enable="YES"
> [og-qa] out: ntpd_sync_on_start="YES"
> [og-ci] out: ntpd_enable="YES"
> [og-ci] out: ntpd_sync_on_start="YES"
> [og-test] out: ntpd_enable="YES"
> [og-test] out: ntpd_sync_on_start="YES"
> [og-prod-rm] out: ntpd_enable="YES"
> [og-prod-rm] out: ntpd_sync_on_start="YES"
> 
> @Mac-mini ~/p/f/> fab -R ENV,OG,OG-PROD -- cat /etc/ntp.conf | grep -v 'out: 
> #'
> [envrm02] Executing task '<remainder>'
> [envrm02] run: cat /etc/ntp.conf
> [envrm02] out:
> [envrm02] out: server 0.freebsd.pool.ntp.org iburst
> [envrm02] out: server 1.freebsd.pool.ntp.org iburst
> [envrm02] out: server 2.freebsd.pool.ntp.org iburst
> [envrm02] out:
> [envrm02] out: restrict default limited kod nomodify notrap nopeer noquery
> [envrm02] out: restrict -6 default limited kod nomodify notrap nopeer noquery
> [envrm02] out: restrict 127.0.0.1
> [envrm02] out: restrict -6 ::1
> [envrm02] out: restrict 127.127.1.0
> 
> [og-qa] Executing task '<remainder>'
> [og-qa] run: cat /etc/ntp.conf
> [og-qa] out:
> [og-qa] out: server 0.freebsd.pool.ntp.org iburst
> [og-qa] out: server 1.freebsd.pool.ntp.org iburst
> [og-qa] out: server 2.freebsd.pool.ntp.org iburst
> [og-qa] out:
> [og-qa] out: restrict default limited kod nomodify notrap nopeer noquery
> [og-qa] out: restrict -6 default limited kod nomodify notrap nopeer noquery
> [og-qa] out: restrict 127.0.0.1
> [og-qa] out: restrict -6 ::1
> [og-qa] out: restrict 127.127.1.0
> 
> [og-ci] Executing task '<remainder>'
> [og-ci] run: cat /etc/ntp.conf
> [og-ci] out:
> [og-ci] out: server 0.freebsd.pool.ntp.org iburst
> [og-ci] out: server 1.freebsd.pool.ntp.org iburst
> [og-ci] out: server 2.freebsd.pool.ntp.org iburst
> [og-ci] out:
> [og-ci] out: restrict default limited kod nomodify notrap nopeer noquery
> [og-ci] out: restrict -6 default limited kod nomodify notrap nopeer noquery
> [og-ci] out: restrict 127.0.0.1
> [og-ci] out: restrict -6 ::1
> [og-ci] out: restrict 127.127.1.0
> 
> [og-test] Executing task '<remainder>'
> [og-test] run: cat /etc/ntp.conf
> [og-test] out:
> [og-test] out: server 0.freebsd.pool.ntp.org iburst
> [og-test] out: server 1.freebsd.pool.ntp.org iburst
> [og-test] out: server 2.freebsd.pool.ntp.org iburst
> [og-test] out:
> [og-test] out: restrict default limited kod nomodify notrap nopeer noquery
> [og-test] out: restrict -6 default limited kod nomodify notrap nopeer noquery
> [og-test] out: restrict 127.0.0.1
> [og-test] out: restrict -6 ::1
> [og-test] out: restrict 127.127.1.0
> 
> Some observation:
> * The clock of envrm02 (the HOST) always seems to be correct.
> * The issue happens on a (apparently) random guest (not always the same one).
> * The issue happens always on one host at a time.
> 
> The bhyve command line is, roughly, this one:
> 
> /usr/sbin/bhyveload -m 2048 -d /san_storage/VMfs/$machine/$machine.img 
> $machine
> /usr/sbin/bhyve -c 2 -m 2048 -A -H -P -s 0,hostbridge -s
> 2,ahci-hd,/san_storage/VMfs/$machine/$machine.img -s 4,virtio-net,$tap
> -s 31,lpc -l com1,stdio $machine
> 
> Thanks in advance.
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