[Bug 229926] FreeBSD loader(8) - /boot/zfsloader - is unable to boot other then currently set BE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229926

            Bug ID: 229926
           Summary: FreeBSD loader(8) - /boot/zfsloader - is unable to
                    boot other then currently set BE
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: vermaden at interia.pl

Created attachment 195335
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195335&action=edit
zfsloader-beadm.png

Hi,

the title is probably misleading so let me try to explain the details.

You have two boot environments, currently booted one called 'safe' and you just
created new one as backup, lets call it 'test'.

# beadm list
BE   Active Mountpoint  Space Created
safe NR     /          378.1M 2018-07-20 07:26
test -      -          412.0K 2018-07-21 18:51

Now, lets create 'disaster', we will remove the /boot directory from the
currently used BE.

# rm -rf /boot

... and restart.

# reboot

Now the loader(8) does not even show us Boot Menu but only error message that
it is not able to locate the /boot/zfsloader from the currently set bootfs
option for zroot, as shown on the zfsloader-beadm.png image, and that is quite
OK, it waits at boot: prompt waiting for an option.

... but if I type zroot/ROOT/test:/boot/kernel/kernel there is stops with BTX
halted message.


The 'fix' for that is to boot from ISO or MEMSTICK with LiveCD option and set
bootfs manurally for zroot to zroot/ROOT/test value and reboot, as shown on the
zfsloader-zpool-bootfs.png image.

IMHO if we type zroot/ROOT/test:/boot/kernel/kernel at boot: prompt it should
not halt, but proove me wrong.

Regards,
vermaden

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