I have spent some time attempting to duplicate this problem w/o much
success.
I have duplicated your setup as closely as I can, which, unfortunately
is not real close:
1) I am running under QEMU, and
2) I have smaller drive; unfortunately, I don't have a spare TB drive
lying around :-((
I read the thread on the QNAP site you linked to as well.
I have one thing that should be simple to try:
Change your /etc/mdadm/mdadm.conf DEVICE line to read:
DEVICE /dev/sd*
Then, retry mdadm --assemble ...
If it still fails, running under strace again may help.
If it "succeeds", then I think there is reasonable chance this is
related to the mtdblock device(s). Update the initramfs, reboot, and
see if the devices are normal on startup.
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