[Bug 285848] Boot environment failure with AWS AMI

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=285848

            Bug ID: 285848
           Summary: Boot environment failure with AWS AMI
           Product: Base System
           Version: 14.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: amendlik@gmail.com

When using an EC2 instance created from an official FreeBSD AMI, the system
will fail to boot if any boot environment other than 'default' is activated.

This has been tested using the AMIs for 14.1-RELEASE and 14.2-RELEASE. Here are
some of the errors that appear when trying to use a boot environment other than
'default':

Feeding entropy: /etc/rc: WARNING: /dev/random is not writeable
ifconfig: ioctl(SIOCGIFINFO_IN6): Invalid argument
Can't find free bpf: No such file or directory
devd: Can't open devctl device /dev/devctl: No such file or directory
/etc/rc: WARNING: failed to start devd
No ephemeral disks are available, so no swap space is being created.
ls: /dev/nda*: No such file or directory
ls: /dev/nvd*: No such file or directory
devfs rule: ioctl DEVFSIO_RGETNEXT: Inappropriate ioctl for device
/etc/rc: WARNING: devfs_init_rulesets: could not read rules from
/etc/defaults/devfs.rules

The problem seems to be that the zroot/ROOT/default dataset has its 'canmount'
property set to 'on'. This works fine, as long as the active boot environment
is default, but when you activate another boot environment, the system tries to
mount both at / and the boot fails.

The 'canmount' property should be set to 'noauto' for zroot/ROOT/default to
resolve the problem.

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