v2023.2: FritzBox 4040: Kernel Warning in airtime_link_metric_get spamming log

[SmithChart]

Bug report

What is the problem?
I have just build Gluon v2023.2 for our community and have grabbed a FritzBox 4040 for some initial testing.

During normal operation I ssh into the device and find lots of Kernel warnings in the log:

Sun Jan 14 17:41:18 2024 kern.warn kernel: [  141.776941] ------------[ cut here ]------------
Sun Jan 14 17:41:18 2024 kern.warn kernel: [  141.776997] WARNING: CPU: 0 PID: 72 at backports-6.1.24/net/mac80211/mesh_hwmp.c:353 airtime_link_metric_get+0xe0/0x614 [mac80211]
Sun Jan 14 17:41:18 2024 kern.warn kernel: [  141.780888] Modules linked in: iptable_nat batman_adv ath10k_pci ath10k_core ath xt_state xt_nat xt_conntrack xt_REDIRECT xt_MASQUERADE xt_CT wireguard nf_nat nf_conntrack mac80211 libchacha20poly1305 ipt_REJECT ebtable_nat ebtable_filter ebtable_broute curve25519_neon cfg80211 xt_time xt_tcpudp xt_quota xt_pkttype xt_owner xt_multiport xt_mark xt_mac xt_limit xt_comment xt_addrtype xt_TCPMSS xt_LOG poly1305_arm nlmon nf_reject_ipv4 nf_log_syslog nf_defrag_ipv6 nf_defrag_ipv4 libcurve25519_generic libcrc32c iptable_mangle iptable_filter ip_tables ebtables ebt_vlan ebt_stp ebt_snat ebt_redirect ebt_pkttype ebt_mark_m ebt_mark ebt_limit ebt_ip6 ebt_ip ebt_dnat ebt_arpreply ebt_arp ebt_among ebt_802_3 compat chacha_neon ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 dummy ip_tunnel veth vxlan udp_tunnel ip6_udp_tunnel sha512_arm kpp ghash_arm_ce cmac leds_gpio xhci_plat_hcd xhci_pci xhci_hcd dwc3 dwc3_qcom gpio_button_hotplug crc32c_generic
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.855726] CPU: 0 PID: 72 Comm: kworker/u8:1 Tainted: G        W         5.15.139 #0
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.877875] Hardware name: Generic DT based system
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.885858] Workqueue: phy0 ieee80211_iface_work [mac80211]
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.890550] [<c030d44c>] (unwind_backtrace) from [<c0309828>] (show_stack+0x10/0x14)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.896021] [<c0309828>] (show_stack) from [<c05cac24>] (dump_stack_lvl+0x40/0x4c)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.904004] [<c05cac24>] (dump_stack_lvl) from [<c0322500>] (__warn+0x8c/0x100)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.911381] [<c0322500>] (__warn) from [<c03225dc>] (warn_slowpath_fmt+0x68/0x78)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.918586] [<c03225dc>] (warn_slowpath_fmt) from [<bf35dd2c>] (airtime_link_metric_get+0xe0/0x614 [mac80211])
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.926233] [<bf35dd2c>] (airtime_link_metric_get [mac80211]) from [<bf35dd6c>] (airtime_link_metric_get+0x120/0x614 [mac80211])
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.936131] [<bf35dd6c>] (airtime_link_metric_get [mac80211]) from [<bf35e328>] (mesh_rx_path_sel_frame+0xc8/0x9dc [mac80211])
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.947848] [<bf35e328>] (mesh_rx_path_sel_frame [mac80211]) from [<bf3591ec>] (ieee80211_mesh_rx_queued_mgmt+0x4a0/0x5e0 [mac80211])
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.959047] [<bf3591ec>] (ieee80211_mesh_rx_queued_mgmt [mac80211]) from [<bf311ab4>] (ieee80211_iface_work+0x324/0x46c [mac80211])
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.971113] [<bf311ab4>] (ieee80211_iface_work [mac80211]) from [<c033aec8>] (process_one_work+0x210/0x478)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.982741] [<c033aec8>] (process_one_work) from [<c033ba44>] (worker_thread+0x4c/0x598)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  141.992460] [<c033ba44>] (worker_thread) from [<c0342268>] (kthread+0x128/0x144)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.000791] [<c0342268>] (kthread) from [<c0300114>] (ret_from_fork+0x14/0x20)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.008167] Exception stack(0xc127bfb0 to 0xc127bff8)
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.015201] bfa0:                                     00000000 00000000 00000000 00000000
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.020329] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.028487] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.036726] ---[ end trace 22ef9a94952e5491 ]---

These happen somewhere between a few times every second and every 10 seconds.
I can not trace this back to any external action I am doing.

Sometimes, but not always, the warnings are accompanied by the following messages:

Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.044526] ath10k_ahb a000000.wifi: SWBA overrun on vdev 0, skipped old beacon
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.047983] ath10k_ahb a000000.wifi: SWBA overrun on vdev 1, skipped new beacon
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.056385] ath10k_ahb a800000.wifi: SWBA overrun on vdev 1, skipped old beacon
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.062539] ath10k_ahb a800000.wifi: SWBA overrun on vdev 0, skipped old beacon
Sun Jan 14 17:41:19 2024 kern.warn kernel: [  142.069560] ath10k_ahb a800000.wifi: SWBA overrun on vdev 1, skipped old beacon

What is the expected behaviour?
I would expect these warnings not to happen :-)

This does not seem to perform normal operation - but at least the log on the devices gets rather useless.
For our beta-devices we use rsyslog and log to a machine in our infrastructure. I guess we will see an increase in volume here, too.

Gluon Version:
Our build is based on 247e781 (Gluon v2023.2).

Site Configuration:
We are building with this site configuration.

Custom patches:

We have some quite some modifications on top up upstream Gluon( Gluon, Gluon Packages, OpenWrt Packages ), but none of these touch the Kernel or Kernel config.

[maurerle]

This warning is related to openwrt/openwrt#12003
As you already noted, this does not have an influence on the normal operation.

But yes, we should do something about these warning messages.