[Bug 229357] bootpool is not imported after boot (separated bootpool/zroot due to zroot encryption)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229357

            Bug ID: 229357
           Summary: bootpool is not imported after boot (separated
                    bootpool/zroot due to zroot encryption)
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: petr.fischer at me.com

I have encrypted zroot partition, so, my bootpool is separated from zroot
zpool. Encryption classic, via GELI, password prompt before boot.

But on freshly updated 10.2, after every reboot, bootpool is not imported, so,
no access to the kernel modules, resulting in other related issues (some
autoloaded modules from rc.conf, like vbox, can crash the whole system during
boot, because bootpool is just not available/auto imported)...

This is similar to bug #212258, but I have GPT (not MBR).

Workaround is probably to import bootpool in rc.local and then, load all
necesary kernel modules (like linux, vbox etc.) manualy again (also in
rc.local).

This bug occurs probably only on separated bootpool/zroot systems, due to zroot
encryption.

Also - I have GPT partitions, but I am booting in CMS BIOS Mode (classic BIOS
way), not UEFI, because with UEFI, my i915kms Intel Graphics does not work
(tested on 11.0 and 11.1).

Is there any new way how to config encrypted zroot, than separated
bootpool/zroot?

--- gpt output ----
=>       40  500118112  ada0  GPT  (238G)
         40       2008        - free -  (1.0M)
       2048       1024     1  freebsd-boot  (512K)
       3072       1024        - free -  (512K)
       4096     204800     2  efi  (100M)
     208896       2048        - free -  (1.0M)
     210944    4194304     3  freebsd-zfs  (2.0G)
    4405248    8388608     4  freebsd-swap  (4.0G)
   12793856  487324296     5  freebsd-zfs  (232G)

--- loader.conf (selection) ---
...
geli_ada0p5_keyfile0_load="YES"
geli_ada0p5_keyfile0_type="ada0p5:geli_keyfile0"
geli_ada0p5_keyfile0_name="/boot/encryption.key"
geom_eli_load="YES"
geom_eli_passphrase_prompt="YES"
vfs.root.mountfrom="zfs:zroot/ROOT/default"
kern.geom.label.disk_ident.enable="1"
kern.geom.label.gptid.enable="1"
zpool_cache_load="YES"
zpool_cache_type="/boot/zfs/zpool.cache"
zpool_cache_name="/boot/zfs/zpool.cache"
...

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