LAN bridge is not working with 5.15.80 [Was: Re: [PATCH v2] mvebu: switch default kernel to 5.15]

[Petr Štetiar]

Stijn Segers <foss at volatilesystems.org> [2022-12-02 13:36:20]:

Hi,

> * cortexa9 (Turris Omnia - 03f41b1eb2f15ab06d5800274be6a67c64e2a629)

that is interesting, is the latest snapshot working for you?

I got notified this morning, that Turris Omnia CI job fails[1] as the CI DUT
bringup machinery is unable to confirm[2], that DUT's LAN network is available
after 60 seconds.

That availability check is simply doing following for 60 seconds and then gives
up:

  $ ifstatus lan | jsonfilter -qe "@.up"

It seems, that indeed `br-lan` is broken:

	root at OpenWrt:/# ifstatus lan
	{
		"up": false,
		"pending": false,
		"available": false,
		"autostart": true,
		"dynamic": false,
		"proto": "static",
		"device": "br-lan",
		"data": {

		},
		"errors": [
			{
				"subsystem": "interface",
				"code": "NO_DEVICE"
			}
		]
	}

More details from the board:

	root at OpenWrt:/# ubus call system board
	{
		"kernel": "5.15.80",
		"hostname": "OpenWrt",
		"system": "ARMv7 Processor rev 1 (v7l)",
		"model": "Turris Omnia",
		"board_name": "cznic,turris-omnia",
		"rootfs_type": "initramfs",
		"release": {
			"distribution": "OpenWrt",
			"version": "SNAPSHOT",
			"revision": "r21380-5429411f73",
			"target": "mvebu/cortexa9",
			"description": "OpenWrt SNAPSHOT r21380-5429411f73"
		}
	}

	root at OpenWrt:/# cat /etc/config/network 

	config interface 'loopback'
		option device 'lo'
		option proto 'static'
		option ipaddr '127.0.0.1'
		option netmask '255.0.0.0'

	config globals 'globals'
		option ula_prefix 'fdd1:d3b1:e703::/48'

	config device
		option name 'br-lan'
		option type 'bridge'
		list ports 'lan0'
		list ports 'lan1'
		list ports 'lan2'
		list ports 'lan3'
		list ports 'lan4'

	config interface 'lan'
		option device 'br-lan'
		option proto 'static'
		option ipaddr '192.168.1.1'
		option netmask '255.255.255.0'
		option ip6assign '60'

	config interface 'wan'
		option device 'eth2'
		option proto 'dhcp'

	config interface 'wan6'
		option device 'eth2'
		option proto 'dhcpv6'

dmesg is visible in console_turris-omnia-initramfs.txt[2]. It seems really
like 5.15 regression as:

 21.02 snapshot (5.4.225) https://gitlab.com/ynezz/openwrt-device-runtime-testing/-/jobs/3418109997
 22.03 snapshot (5.10.156) https://gitlab.com/ynezz/openwrt-device-runtime-testing/-/jobs/3418110000

Passed the tests fine this morning. Re-run of the job failed as well, so it
should be reproducible issue:

 https://gitlab.com/ynezz/openwrt-device-runtime-testing/-/jobs/3418110003


1. https://gitlab.com/ynezz/openwrt-device-runtime-testing/-/jobs/3418152314
2. https://gitlab.com/ynezz/openwrt-device-runtime-testing/-/jobs/3418152314/artifacts/external_file/console_turris-omnia-initramfs.txt


Cheers,

Petr