zpool import failes with internal error: Unknown Error 122

[freebsdlists at bsdunix.ch]

Hi,

I can't import an exported raidz1 pool based on 4 disk. An zpool export 
was done with Freebsd 11.2 and an import too. One disk (ada3 aka 
/dev/diskid/DISK-ZA18YNHS) was marked as unavailable before the export 
was done.

This particular disk was offlined before the export and a zpool 
labelclear ada3 was done too before the export.

I'm unable to import the pool again. 3 of 4 disk are available in raidz1

"zool import storage" command:
    pool: storage
      id: 9514877379131531055
   state: FAULTED
  status: One or more devices are missing from the system.
  action: The pool cannot be imported. Attach the missing
     devices and try again.
    see: http://illumos.org/msg/ZFS-8000-3C
  config:

     storage                   FAULTED  corrupted data
       raidz1-0                FAULTED  corrupted data
         1800501377521064476   UNAVAIL  cannot open
         diskid/DISK-ZA16XZW9  ONLINE
         diskid/DISK-ZA18JE4E  ONLINE
         diskid/DISK-ZA18Z0L1  ONLINE

Disk 1800501377521064476 is ada3 aka /dev/diskid/DISK-ZA18YNH.

I tried to import the pool with -F, -fF, -FfX ...

zool import -f storage fails too.
internal error: Unknown Error 122
Abort (core dumped)

Zdb showes:
zdb -Fe storage gives:
Configuration for import:
         vdev_children: 1
         version: 5000
         pool_guid: 9514877379131531055
         name: 'storage'
         state: 1
         hostid: 2232729950
         hostname: 'my.machine.com'
         vdev_tree:
             type: 'root'
             id: 0
             guid: 9514877379131531055
             children[0]:
                 type: 'raidz'
                 id: 0
                 guid: 12743926568081883225
                 nparity: 1
                 metaslab_array: 40
                 metaslab_shift: 38
                 ashift: 12
                 asize: 32006233653248
                 is_log: 0
                 create_txg: 4
                 children[0]:
                     type: 'disk'
                     id: 0
                     guid: 1800501377521064476
                     path: '/dev/diskid/DISK-ZA18YNHS'
                     whole_disk: 1
                     DTL: 58
                     create_txg: 4
                 children[1]:
                     type: 'disk'
                     id: 1
                     guid: 3017550635642283205
                     whole_disk: 1
                     DTL: 57
                     create_txg: 4
                     path: '/dev/diskid/DISK-ZA16XZW9'
                 children[2]:
                     type: 'disk'
                     id: 2
                     guid: 1070420248480515562
                     whole_disk: 1
                     DTL: 56
                     create_txg: 4
                     path: '/dev/diskid/DISK-ZA18JE4E'
                 children[3]:
                     type: 'disk'
                     id: 3
                     guid: 1151953985479393249
                     whole_disk: 1
                     DTL: 55
                     create_txg: 4
                     path: '/dev/diskid/DISK-ZA18Z0L1'

ZFS_DBGMSG(zdb):
spa_import: importing storage, max_txg=-1 (RECOVERY MODE)
spa_load(storage, config trusted): LOADING
disk vdev '/dev/diskid/DISK-ZA18YNHS': vdev_validate: failed reading config
disk vdev '/dev/diskid/DISK-ZA16XZW9': best uberblock found for spa 
storage. txg 3652256
spa_load(storage, config untrusted): using uberblock with txg=3652256
vdev_copy_path: vdev 3017550635642283205: path changed from '/dev/ada2' 
to '/dev/diskid/DISK-ZA16XZW9'
vdev_copy_path: vdev 1070420248480515562: path changed from '/dev/ada3' 
to '/dev/diskid/DISK-ZA18JE4E'
disk vdev '/dev/diskid/DISK-ZA18YNHS': vdev_validate: failed reading config
raidz-0 vdev (guid 12743926568081883225): metaslab_init failed [error=122]
raidz-0 vdev (guid 12743926568081883225): vdev_load: metaslab_init 
failed [error=122]
spa_load(storage, config trusted): FAILED: vdev_load failed [error=122]
spa_load(storage, config trusted): UNLOADING
spa_load(storage, config trusted): spa_load_retry: rewind, max txg: 3652255
spa_load(storage, config trusted): LOADING
disk vdev '/dev/diskid/DISK-ZA18YNHS': vdev_validate: failed reading config
disk vdev '/dev/diskid/DISK-ZA16XZW9': best uberblock found for spa 
storage. txg 3652253
disk vdev '/dev/diskid/DISK-ZA16XZW9': failed to read label config
spa_load(storage, config untrusted): using uberblock with txg=3652253
spa_load(storage, config untrusted): FAILED: label config unavailable
spa_load(storage, config untrusted): UNLOADING

Any idea if this can be fixed and how? 3 out of 4 disk the raidz1 are fine.

Regards,
Tom