I have seen this too:
md1 : active raid6 sdg[0] sdi[12](S) sdt[15](S) sdy[17](S) sdx[16](S) sdh[8]
sdw[13] sdo[14] sdk[5] sdd[11] sdc[3] sdv[9] sdn[10]
27349121408 blocks super 1.2 level 6, 128k chunk, algorithm 2 [9/9]
[UUUUUUUUU]
bitmap: 2/2 pages [8KB], 1048576KB chunk
mdadm -v --grow /dev/md1 -b none
mdadm -v --grow /dev/md1 --raid-devices=10 --backup-file=/root/back-md1
cat /proc/mdstat
<<hangs>>
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https://bugs.launchpad.net/bugs/1001019
Title:
Mdadm crash on raid5 reshape
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