mdadm kernel panic if trying to change --layout on a RAID10

It is already known this is not possible

 

mdadm --create /dev/md3 --level 10 --layout=f2 --raid-devices=2 /dev/sdc1 /dev/sdd1
mdadm: /dev/sdc1 appears to be part of a raid array:
       level=raid10 devices=2 ctime=Sat Dec 24 18:44:29 2016
mdadm: /dev/sdd1 appears to be part of a raid array:
       level=raid10 devices=2 ctime=Sat Dec 24 18:44:29 2016
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md3 started.
[root@node ~]# mount/
[root@node ~]# mkdir /mnt/md3
[root@node ~]# mount /dev/md3 /mnt

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