Kernel warnings in Newifi D2 -MTK7621 (at backports-4.19.161-1/net/mac80211/tx.c:946)

I have installed latest Openwrt 19.07.6 and i see the attached warnings quite often. I never seen such behaviours in the previous versions.

can anyone explain? should I rollback to the previous version?

[15616.115907] ------------[ cut here ]------------
[15616.120508] WARNING: CPU: 3 PID: 7410 at backports-4.19.161-1/net/mac80211/tx.c:946 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[15616.131552] Modules linked in: pppoe ppp_async rndis_host pppox ppp_generic nf_conntrack_ipv6 mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 cdc_ether xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_FLOWOFFLOAD xt_DSCP xt_CT xt_CLASSIFY usbnet slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache iptable_raw iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat sch_cake nf_conntrack tcp_bbr sch_tbf sch_ingress
[15616.202519]  sch_htb sch_hfsc em_u32 cls_u32 cls_tcindex cls_route cls_matchall cls_fw cls_flow cls_basic act_skbedit act_mirred ledtrig_usbport nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ifb mii leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[15616.233886] CPU: 3 PID: 7410 Comm: kworker/u8:2 Tainted: G        W       4.14.215 #0
[15616.241693] Workqueue: phy0 0x8ec9679c [mac80211@8ec80000+0x6cd40]
[15616.247843] Stack : 00000000 00000000 804d8568 8fd3fa74 00000000 00000000 00000000 00000000
[15616.256171]         00000000 00000000 00000000 00000000 00000000 00000001 8fd3fa30 ac07f5ce
[15616.264499]         8fd3fac8 00000000 00000000 00001d38 00000038 8049e0f8 00000007 00000000
[15616.272826]         00000000 80550000 0003b01d 00000000 8fd3fa10 00000000 00000000 8ece8074
[15616.281150]         8ecae638 000003b2 0000001a 8cfd0c50 00000001 802ae4f0 0000000c 806b000c
[15616.289478]         ...
[15616.291913] Call Trace:
[15616.291967] [<8049e0f8>] 0x8049e0f8
[15616.297875] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[15616.303767] [<802ae4f0>] 0x802ae4f0
[15616.307267] [<8000c1a0>] 0x8000c1a0
[15616.310737] [<8000c1a8>] 0x8000c1a8
[15616.314206] [<80486f44>] 0x80486f44
[15616.317676] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[15616.323579] [<80072ce4>] 0x80072ce4
[15616.327055] [<8002e798>] 0x8002e798
[15616.330544] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[15616.336453] [<8002e880>] 0x8002e880
[15616.339921] [<8015000e>] 0x8015000e
[15616.343397] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[15616.349293] [<8015000e>] 0x8015000e
[15616.352817] [<8ecb046c>] 0x8ecb046c [mac80211@8ec80000+0x6cd40]
[15616.358752] [<8f7ccccc>] 0x8f7ccccc [mt76@8f7c8000+0x79e0]
[15616.364219] [<803495ac>] 0x803495ac
[15616.367696] [<8ecaba14>] 0x8ecaba14 [mac80211@8ec80000+0x6cd40]
[15616.373599] [<8f7cd3c0>] 0x8f7cd3c0 [mt76@8f7c8000+0x79e0]
[15616.379062] [<80032ba4>] 0x80032ba4
[15616.382535] [<8f7d35b4>] 0x8f7d35b4 [mt7603e@8f7d0000+0x9100]
[15616.388253] [<804a4ef8>] 0x804a4ef8
[15616.391738] [<80032f28>] 0x80032f28
[15616.395212] [<8ec9096c>] 0x8ec9096c [mac80211@8ec80000+0x6cd40]
[15616.401105] [<80033000>] 0x80033000
[15616.404589] [<8ec90a54>] 0x8ec90a54 [mac80211@8ec80000+0x6cd40]
[15616.410508] [<8ec91b74>] 0x8ec91b74 [mac80211@8ec80000+0x6cd40]
[15616.416425] [<8ec968c4>] 0x8ec968c4 [mac80211@8ec80000+0x6cd40]
[15616.422324] [<804a0360>] 0x804a0360
[15616.425842] [<80046014>] 0x80046014
[15616.429347] [<8004650c>] 0x8004650c
[15616.432813] [<80067ad0>] 0x80067ad0
[15616.436295] [<800461bc>] 0x800461bc
[15616.439767] [<8004c108>] 0x8004c108
[15616.443239] [<8004bfd8>] 0x8004bfd8
[15616.446715] [<8004bfd8>] 0x8004bfd8
[15616.450188] [<8004bfd8>] 0x8004bfd8
[15616.453657] [<80006f78>] 0x80006f78
[15616.457130] 
[15616.458882] ---[ end trace 7d56c42ca5d7c698 ]---
[16682.148918] ------------[ cut here ]------------
[16682.153598] WARNING: CPU: 2 PID: 7485 at backports-4.19.161-1/net/mac80211/tx.c:946 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[16682.164702] Modules linked in: pppoe ppp_async rndis_host pppox ppp_generic nf_conntrack_ipv6 mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 cdc_ether xt_time xt_tcpudp xt_tcpmss xt_statistic xt_state xt_recent xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_HL xt_FLOWOFFLOAD xt_DSCP xt_CT xt_CLASSIFY usbnet slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_nat nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv6 nf_defrag_ipv4 nf_conntrack_rtcache iptable_raw iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat sch_cake nf_conntrack tcp_bbr sch_tbf sch_ingress
[16682.235922]  sch_htb sch_hfsc em_u32 cls_u32 cls_tcindex cls_route cls_matchall cls_fw cls_flow cls_basic act_skbedit act_mirred ledtrig_usbport nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ifb mii leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[16682.267474] CPU: 2 PID: 7485 Comm: kworker/u8:0 Tainted: G        W       4.14.215 #0
[16682.275332] Workqueue: phy1 0x8ec9679c [mac80211@8ec80000+0x6cd40]
[16682.281509] Stack : 00000000 00000000 804d8568 8fc73a4c 00000000 00000000 00000000 00000000
[16682.289872]         00000000 00000000 00000000 00000000 00000000 00000001 8fc73a08 ac07f5ce
[16682.298239]         8fc73aa0 00000000 00000000 00002d20 00000038 8049e0f8 00000007 00000000
[16682.306610]         00000000 80550000 00043384 00000000 8fc739e8 00000000 00000000 8ece8074
[16682.314980]         8ecae638 000003b2 0000001a cb0a8daf 00000001 802ae4f0 00000008 806b0008
[16682.323354]         ...
[16682.325815] Call Trace:
[16682.325944] [<8049e0f8>] 0x8049e0f8
[16682.331931] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[16682.337856] [<802ae4f0>] 0x802ae4f0
[16682.341396] [<8000c1a0>] 0x8000c1a0
[16682.344886] [<8000c1a8>] 0x8000c1a8
[16682.348370] [<80486f44>] 0x80486f44
[16682.351858] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[16682.357763] [<80072ce4>] 0x80072ce4
[16682.361256] [<8002e798>] 0x8002e798
[16682.364745] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[16682.370710] [<8002e880>] 0x8002e880
[16682.374202] [<8ecae638>] 0x8ecae638 [mac80211@8ec80000+0x6cd40]
[16682.380150] [<8ecb046c>] 0x8ecb046c [mac80211@8ec80000+0x6cd40]
[16682.386181] [<8f7ccccc>] 0x8f7ccccc [mt76@8f7c8000+0x79e0]
[16682.391700] [<8f7cd010>] 0x8f7cd010 [mt76@8f7c8000+0x79e0]
[16682.397174] [<8ed14c10>] 0x8ed14c10 [mt76x02_lib@8ed10000+0x9700]
[16682.403264] [<80032ba4>] 0x80032ba4
[16682.406756] [<804a4ef8>] 0x804a4ef8
[16682.410259] [<80032f28>] 0x80032f28
[16682.413746] [<8ec9096c>] 0x8ec9096c [mac80211@8ec80000+0x6cd40]
[16682.419652] [<80033000>] 0x80033000
[16682.423140] [<8ec90a54>] 0x8ec90a54 [mac80211@8ec80000+0x6cd40]
[16682.429048] [<8ec917bc>] 0x8ec917bc [mac80211@8ec80000+0x6cd40]
[16682.434999] [<8ec91b74>] 0x8ec91b74 [mac80211@8ec80000+0x6cd40]
[16682.440897] [<800886a8>] 0x800886a8
[16682.444405] [<8ec968c4>] 0x8ec968c4 [mac80211@8ec80000+0x6cd40]
[16682.450337] [<804a0360>] 0x804a0360
[16682.453844] [<80046014>] 0x80046014
[16682.457375] [<8004650c>] 0x8004650c
[16682.460851] [<80067ad0>] 0x80067ad0
[16682.464366] [<800461bc>] 0x800461bc
[16682.467864] [<8004c108>] 0x8004c108
[16682.471342] [<8004bfd8>] 0x8004bfd8
[16682.474827] [<8004bfd8>] 0x8004bfd8
[16682.478319] [<8004bfd8>] 0x8004bfd8
[16682.481793] [<80006f78>] 0x80006f78
[16682.485277] 
[16682.486963] ---[ end trace 7d56c42ca5d7c699 ]---`

TL-WA805 v5 ; MediaTek MT7628AN ver:1 eco:2

19.07.7. I see these warnings too. But thing that is more bugging is that after about 2.5 days of loading it also means the radio dies.

Well I'm not entirely sure about they are related as it takes 25 minutes after such a warning, but after that no station can authenticate anymore. While the AP is still reachable over the wire.

For now I'll solve it with a daily reboot.