iptables physdev match broken

Bug #2024421 reported by Joni Karjalainen
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux-hwe-5.15 (Ubuntu)
New
Undecided
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Bug Description

A generic bug report that lead to discovering the root cause:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2020524

### Copied from bug report above, applies to current issue exactly
== Regression details ==
Discovered in version: 5.19.0-42.43~22.04.1
Last known good version: 5.19.0-41.42~22.04.1

How to tell? Add & use a bridge interface, add catchall filter (no -j ACTION needed) see if *any* bridge traffic is tracked:
# iptables -A INPUT -m physdev --physdev-in + -m comment --comment "watch me"
# iptables -nvL INPUT | grep watch

1)
Description: Ubuntu 20.04.6 LTS
Release: 20.04

2)
5.15.0-75.82~20.04.1

3)
Expected iptables bridge filtering via physdev module to work

4)
Instead the physdev module cannot be used for bridge filtering, does not work at all

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