Zyxel NBG6817 Wi-Fi issue at 21.02

Can someone explain to me why this morning I could not connect to Wi-Fi: the network was simply not on the air, and in the logs I saw this:


Fri Sep 17 04:52:59 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:52:59 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:52:59 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:52:59 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:52:59 2021 kern.info kernel: [537396.125955] device wlan0 left promiscuous mode
Fri Sep 17 04:52:59 2021 kern.info kernel: [537396.126105] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:00 2021 daemon.notice netifd: Network device 'wlan0' link is down
Fri Sep 17 04:53:00 2021 kern.info kernel: [537396.177816] ath10k_pci 0000:01:00.0: mac flush null vif, drop 0 queues 0xffff
Fri Sep 17 04:53:00 2021 kern.warn kernel: [537396.180594] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:00 2021 kern.warn kernel: [537396.183949] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:00 2021 kern.warn kernel: [537396.190884] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:00 2021 daemon.notice hostapd: wlan0: interface state ENABLED->DISABLED
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.183329] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.183354] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.263840] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.264663] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.643408] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.646704] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.651478] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.658570] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.664317] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:53:06 2021 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.705884] device wlan0 left promiscuous mode
Fri Sep 17 04:53:06 2021 kern.info kernel: [537402.705961] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:06 2021 kern.warn kernel: [537402.747269] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:06 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DISABLED
Fri Sep 17 04:53:12 2021 kern.warn kernel: [537408.723526] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:12 2021 kern.warn kernel: [537408.723552] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:12 2021 kern.info kernel: [537408.804177] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:12 2021 kern.info kernel: [537408.805011] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.183502] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:13 2021 kern.warn kernel: [537409.186422] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.191731] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.198663] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.204429] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:53:13 2021 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.245908] device wlan0 left promiscuous mode
Fri Sep 17 04:53:13 2021 kern.info kernel: [537409.245984] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:13 2021 kern.warn kernel: [537409.287334] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:13 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DISABLED
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.264118] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.264144] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.344719] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.345546] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.724441] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.727914] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.732694] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.739625] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: DFS-RADAR-DETECTED freq=5660 ht_enabled=0 chan_offset=0 chan_width=3 cf1=5690 cf2=0
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: dfs_downgrade_bandwidth: no DFS channels left, waiting for NOP to finish
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: AP-DISABLED
Fri Sep 17 04:53:19 2021 daemon.err hostapd: hostapd_free_hapd_data: Interface wlan0 wasn't started
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: nl80211: deinit ifname=wlan0 disabled_11b_rates=0
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.745420] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.785974] device wlan0 left promiscuous mode
Fri Sep 17 04:53:19 2021 kern.info kernel: [537415.786050] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:19 2021 kern.warn kernel: [537415.827580] ath10k_pci 0000:01:00.0: peer-unmap-event: unknown peer id 0
Fri Sep 17 04:53:19 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DISABLED
Fri Sep 17 04:53:25 2021 kern.warn kernel: [537421.819795] ath10k_pci 0000:01:00.0: 10.4 wmi init: vdevs: 16  peers: 48  tid: 96
Fri Sep 17 04:53:25 2021 kern.warn kernel: [537421.819821] ath10k_pci 0000:01:00.0: msdu-desc: 2500  skid: 32
Fri Sep 17 04:53:25 2021 kern.info kernel: [537421.900312] ath10k_pci 0000:01:00.0: wmi print 'P 48/48 V 16 K 144 PH 176 T 186  msdu-desc: 2500  sw-crypt: 0 ct-sta: 0'
Fri Sep 17 04:53:25 2021 kern.info kernel: [537421.901116] ath10k_pci 0000:01:00.0: wmi print 'free: 84920 iram: 13156 sram: 11224'
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.279603] ath10k_pci 0000:01:00.0: rts threshold -1
Fri Sep 17 04:53:26 2021 kern.warn kernel: [537422.282980] ath10k_pci 0000:01:00.0: Firmware lacks feature flag indicating a retry limit of > 2 is OK, requested limit: 4
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.288253] br-lan: port 2(wlan0) entered blocking state
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.294721] br-lan: port 2(wlan0) entered disabled state
Fri Sep 17 04:53:26 2021 kern.info kernel: [537422.300607] device wlan0 entered promiscuous mode
Fri Sep 17 04:53:26 2021 daemon.notice hostapd: wlan0: interface state DISABLED->COUNTRY_UPDATE
Fri Sep 17 04:53:26 2021 daemon.notice hostapd: wlan0: interface state COUNTRY_UPDATE->HT_SCAN
Fri Sep 17 04:53:26 2021 daemon.err hostapd: could not get valid channel
Fri Sep 17 04:53:26 2021 daemon.notice hostapd: wlan0: interface state HT_SCAN->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5660 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5660 cf2=0
Fri Sep 17 05:23:17 2021 daemon.err hostapd: could not get valid channel
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5680 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5680 cf2=0
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5660 chan=132 sec_chan=1, width=0, seg0=138, seg1=0, cac_time=60s
Fri Sep 17 05:23:17 2021 daemon.err hostapd: 20/40 MHz: center segment 0 (=138) and center freq 1 (=5670) not in sync
Fri Sep 17 05:23:17 2021 daemon.err hostapd: Can't set freq params
Fri Sep 17 05:23:17 2021 daemon.err hostapd: DFS start_dfs_cac() failed, -1
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5700 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5700 cf2=0
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5660 chan=132 sec_chan=1, width=0, seg0=138, seg1=0, cac_time=60s
Fri Sep 17 05:23:17 2021 daemon.err hostapd: 20/40 MHz: center segment 0 (=138) and center freq 1 (=5670) not in sync
Fri Sep 17 05:23:17 2021 daemon.err hostapd: Can't set freq params
Fri Sep 17 05:23:17 2021 daemon.err hostapd: DFS start_dfs_cac() failed, -1
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-NOP-FINISHED freq=5720 ht_enabled=0 chan_offset=0 chan_width=0 cf1=5720 cf2=0
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: interface state DFS->DFS
Fri Sep 17 05:23:17 2021 daemon.notice hostapd: wlan0: DFS-CAC-START freq=5660 chan=132 sec_chan=1, width=0, seg0=138, seg1=0, cac_time=60s
Fri Sep 17 05:23:17 2021 daemon.err hostapd: 20/40 MHz: center segment 0 (=138) and center freq 1 (=5670) not in sync
Fri Sep 17 05:23:17 2021 daemon.err hostapd: Can't set freq params
Fri Sep 17 05:23:17 2021 daemon.err hostapd: DFS start_dfs_cac() failed, -1

I too have an issue with my Zyxel Armor Z2 (NBG6817) on 21.02.
The 5ghz Wifi crashes during large downloads like Steam games. Regular use seems to be fine.

Older thread but it is not the load it is DFS radar detection (weather radar...).

Details here: 5 GHz WLAN craps out (upon radar detection?) - start_dfs_cac() failed - #22 by NilsRo