Problems after reshaping of Raid5 array

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Hi all.

I'm a little bit in panic... and I really need some help to solve this
(if possible......)...

I have a storage server in my LAN where I save everything
for security (sigh).

The system consists in a 32 GB SSD containing the o.s.
plus 4 WD EADS 1TB harddisks in RAID5 with all my data.
The disks are seen by the system as sdb1, sdc1, sdd1, sde1

Yesterday evening I added another WD, this time an EARS
(512 byte sectors): I created a partition on it, respecting the
alignment and then I added it to the array and performed a
grow command

mdadm --add /dev/md6 /dev/sdb1 (after adding it, the hd took sdb)
mdadm --grow /dev/md6 --raid-devices=5

Reshape started... and worked until today. Or better, until the system
hangs and I have to sync+remount-ro with the sysrq keys.

After rebooting, the reshaping restarted, but the disk become sdb
not sdb1 in the raid array, and the file system became unreadable

Any ideas of what happened?

Thanks a lot for any suggestion you can give me.
I attach the mdadm -E and dumpe2fs outputs

Attachment: mdadm-e.tgz
Description: GNU Zip compressed data

Attachment: dumpe2fs
Description: Binary data


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