I did not reboot my system until I got into the system via ssh and looked at the logs and saw the system crashing with core dumps.
Here is the log entry when the system auto rebooted.
Mar 8 20:31:31 eisy shutdown[74622]: reboot by udx_installer:
Below is when the system came up from the first reboot that the upgrade script did. This is the first log entry of the core dump, note time.
Mar 8 20:32:21 eisy kernel: pid 1723 (isy-freebsd-x64), jid 0, uid 349: exited on signal 11 (core dumped)
...
Mar 8 20:45:31 eisy kernel: pid 36451 (isy-freebsd-x64), jid 0, uid 349: exited on signal 11 (core dumped)
Mar 8 20:45:51 eisy kernel: pid 37202 (isy-freebsd-x64), jid 0, uid 349: exited on signal 11 (core dumped)
Mar 8 20:46:12 eisy kernel: pid 38065 (isy-freebsd-x64), jid 0, uid 349: exited on signal 11 (core dumped)
Mar 8 20:46:20 eisy reboot[38293]: rebooted by admin
I didn't reboot this system too soon. Note the 14-minute time gap with constant core dumps and when I rebooted it. The upgrade process failed. Are you saying the system should core dump constantly for 2 hours?