I tried to convert a raid6 to raid5 using mdadm --grow --backup-file=/root/md1.backup -n 4 -l 5. The first part (reshaping the layout) has finished, but the second part (reducing from raid6 to raid5 and removing one drive) fails with a segmentation fault. I am now stuck with a raid6 with left-symetric-6 layout. Every run of mdadm --grow ends in the segmentation fault.
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