Should I be worried? my firmware image was created via ImageBuilder, all seems fine for a while now, this is the first instance I've seen of a kernel warning since upgrading to v19.07.7 and it continued working after that(except for maybe having no internet access for a few moments and returning to normal).
Machine: Netgear R6220, v19.07.7, firmware built using ImageBuilder.
[99329.982246] WARNING: CPU: 1 PID: 14 at /git_repo/openwrt/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/mt76-2021-02-15-5c768dec/mt7603/mac.c:204 0x86c74290 [mt7603e@86c70000+0x90e0]
[99330.019480] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 lz4 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 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 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 lz4_decompress lz4_compress iptable_raw iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat sch_cake nf_conntrack sch_tbf sch_ingress
[99330.160642] 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 leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common zram zsmalloc
[99330.225001] CPU: 1 PID: 14 Comm: ksoftirqd/1 Not tainted 4.14.221 #0
[99330.237634] Stack : 00000000 00000000 00000000 86c80000 00000000 00000000 00000000 00000000
[99330.254267] 00000000 00000000 00000000 00000000 00000000 00000001 87c67b78 5326163c
[99330.270899] 87c67c10 00000000 00000000 00000000 00000038 8045dc38 00000007 00000000
[99330.287531] 00000000 00000000 00036ee9 ffffffff 00000000 87c67b58 00000000 86c74290
[99330.304162] 86c78b94 000000cc 00000002 86c80000 00000003 8028c088 00000004 80650004
[99330.320791] ...
[99330.325650] Call Trace:
[99330.325703] [<8045dc38>] 0x8045dc38
[99330.337485] [<86c74290>] 0x86c74290 [mt7603e@86c70000+0x90e0]
[99330.348920] [<8028c088>] 0x8028c088
[99330.355845] [<8000be48>] 0x8000be48
[99330.362773] [<8000be50>] 0x8000be50
[99330.369705] [<80446bd4>] 0x80446bd4
[99330.376638] [<80071404>] 0x80071404
[99330.383564] [<8002e960>] 0x8002e960
[99330.390500] [<86c74290>] 0x86c74290 [mt7603e@86c70000+0x90e0]
[99330.401935] [<8002e604>] 0x8002e604
[99330.408879] [<86c74290>] 0x86c74290 [mt7603e@86c70000+0x90e0]
[99330.420302] [<8033b9f4>] 0x8033b9f4
[99330.427233] [<80058384>] 0x80058384
[99330.434197] [<86c743fc>] 0x86c743fc [mt7603e@86c70000+0x90e0]
[99330.445626] [<8773c2ec>] 0x8773c2ec [mt76@87738000+0x79a0]
[99330.456561] [<86c718d0>] 0x86c718d0 [mt7603e@86c70000+0x90e0]
[99330.468024] [<8773bb3c>] 0x8773bb3c [mt76@87738000+0x79a0]
[99330.478953] [<87738e0c>] 0x87738e0c [mt76@87738000+0x79a0]
[99330.489894] [<8033be84>] 0x8033be84
[99330.496841] [<80464940>] 0x80464940
[99330.503767] [<8045fd9c>] 0x8045fd9c
[99330.510695] [<8004fb78>] 0x8004fb78
[99330.517628] [<80032d48>] 0x80032d48
[99330.524553] [<8004fd20>] 0x8004fd20
[99330.531480] [<8045fe9c>] 0x8045fe9c
[99330.538409] [<8004bde8>] 0x8004bde8
[99330.545335] [<8004bcb8>] 0x8004bcb8
[99330.552265] [<8004bcb8>] 0x8004bcb8
[99330.559195] [<8004bcb8>] 0x8004bcb8
[99330.566124] [<80006e98>] 0x80006e98
[99330.573054]
[99330.576267] ---[ end trace 3ce5f49d0085a704 ]---