[FS#579] Rename failure when file both in rom and overlay in mvebu / wrt3200acm, due to kernel 4.9 or ubi?

[LEDE Bugs]

The following task has a new comment added:

FS#579 - Rename failure when file both in rom and overlay in mvebu / wrt3200acm, due to kernel 4.9 or ubi? 
User who did this - Hannu Nyman (hnyman)

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Renaming works ok in 17.01.0

I flashed the official 17.01.0 build without settings, and tested renaming. Works ok.

So, this is something new. Likely related to the 4.9 bump.

Reboot (17.01.0, r3205-59508e3)

root at LEDE:/etc# ls -l /overlay/upper/etc/dropbear/
-rw-------    1 root     root           804 Feb 20 17:13 dropbear_rsa_host_key
root at LEDE:/etc# ls -l /rom/etc/dropbear/dropbear_rsa_host_key
-rw-r--r--    1 root     root             0 Feb 20 17:13 /rom/etc/dropbear/dropbear_rsa_host_key

root at LEDE:/etc# mv /etc/dropbear/dropbear_rsa_host_key /etc/dropbear/dropbear_rsa_host_key-x
root at LEDE:/etc#


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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=579#comment2027