Upgraded 12 beta 2.1 -> RC1, and system promptly unable to boot.
It hits a kernel panic at the same point each time, although slightly different messages. Seems to perhaps be related to the cxgbe (Chelsio T540-CR) driver, according to panic dump?
I tried rebooting several times, it's consistent.
I also tried single user+verbose modes - it rebooted abruptly midway through boot without any messaages or warning.
Finally I had to boot via the beta 2.1 boot environment, and it had no problem at all with that.
- 4 x reboot serial console captures
- 1 x debug file via beta 2.1 but includes apparently the latest textdumps from today, under RC1