[Bug 234110] failed to boot FreeBSD 12.0 ; crash in bootloader ; amd64 ; releng/12.0 r342177

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234110

            Bug ID: 234110
           Summary: failed to boot FreeBSD 12.0 ; crash in bootloader ;
                    amd64 ; releng/12.0 r342177
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: ilavsky.martin at gmail.com

Created attachment 200210
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200210&action=edit
Picture of the video output of the KVM console (sorry no serial console on this
KVM)

Hello, 

I was performing an upgrade from 11.2 to 12.0 using svn (releng/12.0 r342177)
on my amd64 machine (Intel S1200BT with Xeon E3-1240). I'm using ZFS on root,
had the booting environment set. 

Booting to newly built kernel went ok. I had the 12.0 kernel with 11.2 world.
After installworld and other expected tasks (mergemaster,...,reboot) I was not
able to boot anymore. Attaching the picture of the crash from bootloader. 

Luckily I was able to interrupt the boot very early and select old loader. 

It seems similar topic was mentioned on FreeBSD forums:
https://forums.freebsd.org/threads/upgrade-disaster-11-2-release-12-0-release.68680/

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