Hi,

I have a firewall which was originally installed with 5.4 release, and
it was configured to be resistant to sudden power outages by means of
mounting / as read only, and /var and /dev partitions as mfs populated
from /mfs/var and /mfs/dev. Here's fstab:

e3f2007c8606c31a.a / ffs ro 1 1
swap /var mfs rw,-P=/mfs/var,-s=32768,nodev,nosuid,noexec 0 0
swap /dev mfs rw,-P=/mfs/dev,-s=8192,-i=128,nosuid,noexec 0 0

Although this is non-critical box on local network, I wanted to keep it
up to date so yesterday I upgraded it to 5.5 first, and then to 5.6. It
appears that it no longer mounts / as read only.

mount output shows the following:
/dev/wd0a on / type ffs (local)
mfs:15966 on /var type mfs (asynchronous, local, nodev, noexec, nosuid, 
size=32768 512-blocks)
mfs:29006 on /dev type mfs (asynchronous, local, noexec, nosuid, size=8192 
512-blocks)

Trying to remount it as read/write says device busy:
$ sudo mount -ur /          
mount_ffs: /dev/wd0a on /: Device busy

What could be preventing read-only mount?

Thank you in advance,
-- 
Marko Cupać
https://www.mimar.rs

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