pleasantone:

I'm marking this critical because it completely breaks firewalls and NAT and is likely to cause quite a bit of grief.
Additionally, I'm submitting it as an incomplete work-in-progress because it is such a critical bug and I want to give an early heads-up.

Device is a ath79 - Archer C7v2.

Bug does not occur in OpenWrt SNAPSHOT r7360-e15565a (master as of July 8th or so)
Bug does occur in OpenWrt SNAPSHOT, r7558-a5c3bba (master as of July 25th)

There have been several updates to ubus and one to the firewall code.

root@g2s:/etc# service firewall restart
Warning: Failed to connect to ubus
Warning: Section @zone[0] (lan) cannot resolve device of network 'lan'
Warning: Section @zone[0] (lan) cannot resolve device of network 'vpn0'
Warning: Section @zone[1] (wan) cannot resolve device of network 'wan_cc'
Warning: Section @zone[1] (wan) cannot resolve device of network 'wan_cc6'
Warning: Section @zone[1] (wan) cannot resolve device of network 'wan_mb'
Warning: Section @zone[1] (wan) cannot resolve device of network 'wan_mb6'
Warning: Section @zone[2] (guest) cannot resolve device of network 'guest'
Warning: Section @zone[0] (lan) has no device, network, subnet or extra options
Warning: Section @zone[1] (wan) has no device, network, subnet or extra options
Warning: Section @zone[2] (guest) has no device, network, subnet or extra options


It is also, possibly, a tools/compiler migration bug, as the master branch was NOT rebuilt from scratch and instead was just pulled and rebuilt.
I am re-creating my compile environment from scratch and rebuilding the tree from scratch and will report back.