[Bug 238398] [zfs] zpool remove <pool> <log device> returns 'pool already exists'

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238398

            Bug ID: 238398
           Summary: [zfs] zpool remove <pool> <log device> returns 'pool
                    already exists'
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: feld at FreeBSD.org

I ran into this error when my NVMe SSD used for log & l2arc failed and could
not boot.

Mounting from zfs:zroot/ROOT/default failed with error 6.

Trying to recover from a livecd was not helping. I could import the pool, but
not remove the device.

Trying to offline the device would return a different error -- 

cannot offline 16642195929625272860: log device has unplayed intent logs


I ended up building a custom zfs.ko with the attached patch which I derived
from this ZoL Github issue: https://github.com/zfsonlinux/zfs/issues/4270

This allowed me to make the pool usable again. After a scrub things are mostly
OK now, though I have one mysterious error left; the other errors it reported
are now gone.

root at colo:/usr/src # zpool status -v
  pool: zroot
 state: ONLINE
status: One or more devices has experienced an error resulting in data
        corruption.  Applications may be affected.
action: Restore the file in question if possible.  Otherwise restore the
        entire pool from backup.
   see: http://illumos.org/msg/ZFS-8000-8A
  scan: scrub repaired 0 in 0 days 20:14:51 with 0 errors on Fri Jun  7
15:58:42 2019
config:

        NAME           STATE     READ WRITE CKSUM
        zroot          ONLINE       0     0     0
          mirror-0     ONLINE       0     0     0
            da4p3.eli  ONLINE       0     0     0
            da5p3.eli  ONLINE       0     0     0
          mirror-1     ONLINE       0     0     0
            da0p3.eli  ONLINE       0     0     0
            da2p3.eli  ONLINE       0     0     0
          mirror-2     ONLINE       0     0     0
            da1p3.eli  ONLINE       0     0     0
            da3p3.eli  ONLINE       0     0     0

errors: Permanent errors have been detected in the following files:

        <0x31abf>:<0x0>

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