After upgrading from 5.2 to 6.0 , raidstart fails
with the error:

/dev/md0: Invalid argument

raidtab is included below.
/var/log/messages:
May 24 17:28:48 cholla kernel: raid0 personality registered
May 24 17:29:04 cholla kernel: (read) sdb1's sb offset:
4192832 [events: 6c6c6c6
c]
May 24 17:29:04 cholla kernel: md: invalid raid superblock
magic on sdb1
May 24 17:29:04 cholla kernel: md: sdb1 has invalid sb, not
importing!
May 24 17:29:04 cholla kernel: could not import sdb1!
May 24 17:29:04 cholla kernel: autostart sdb1 failed!
May 24 17:29:04 cholla kernel: huh12?


raiddev                 /dev/md0
raid-level              0
persistent-superblock   0
nr-raid-disks           2
nr-spare-disks          0

device                  /dev/sdb1
raid-disk               0

device                  /dev/sdc1
raid-disk               1