Light shedding on stack trace in dmesg

Unsure what the cause is for this stack trace:

[40440.347880] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
[40443.206803] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
[123058.411126] ------------[ cut here ]------------
[123058.415875] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:320 0x8036d4f8
[123058.423011] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[123058.430032] Modules linked in: ath9k ath9k_common pppoe ppp_async ath9k_hw ath pppox ppp_generic nf_conntrack_ipv6 mac80211 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 wireguard 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_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat sch_cake nf_conntrack act_skbedit act_mirred em_u32 cls_u32 cls_tcindex cls_flow cls_route
[123058.500804]  cls_fw sch_tbf sch_htb sch_hfsc sch_ingress xt_set ip_set_list_set ip_set_hash_netiface ip_set_hash_netport ip_set_hash_netnet ip_set_hash_net ip_set_hash_netportnet ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables ifb ip6_udp_tunnel udp_tunnel mmc_block mtk_sd mmc_core f2fs crc32_generic leds_gpio xhci_mtk xhci_plat_hcd xhci_pci xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[123058.557148] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.63 #0
[123058.563220] Stack : 00000006 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[123058.571641]         00000000 00000000 00000000 00000000 00000000 00000001 8fc09d60 ac07f526
[123058.580057]         8fc09df8 00000000 00000000 00005508 00000038 80476918 00000008 00000000
[123058.588474]         00000000 80520000 0008805c 70617773 8fc09d40 00000000 80540000 8036d4f8
[123058.596894]         00000009 00000140 00000000 8ff07c40 00000000 80290678 00000000 80580000
[123058.605311]         ...
[123058.607830] Call Trace:
[123058.607846] [<80476918>] 0x80476918
[123058.613915] [<8036d4f8>] 0x8036d4f8
[123058.617471] [<80290678>] 0x80290678
[123058.621026] [<80010040>] 0x80010040
[123058.624581] [<80010048>] 0x80010048
[123058.628136] [<8045f8cc>] 0x8045f8cc
[123058.631692] [<8006f7b0>] 0x8006f7b0
[123058.635247] [<8002e388>] 0x8002e388
[123058.638802] [<8036d4f8>] 0x8036d4f8
[123058.642361] [<8002e3ec>] 0x8002e3ec
[123058.645918] [<8036d4f8>] 0x8036d4f8
[123058.649471] [<80096d20>] 0x80096d20
[123058.653027] [<8036d34c>] 0x8036d34c
[123058.656583] [<80086354>] 0x80086354
[123058.660138] [<8008656c>] 0x8008656c
[123058.663694] [<80076b90>] 0x80076b90
[123058.667251] [<8047ce10>] 0x8047ce10
[123058.670806] [<80032ab4>] 0x80032ab4
[123058.674365] [<802491cc>] 0x802491cc
[123058.677922] [<8000b4e8>] 0x8000b4e8
[123058.681475] 
[123058.683137] ---[ end trace dc2376949d1e6ca4 ]---
[123058.687852] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[123058.694191] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[123058.700283] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0e650000, max=0, ctx=1532, dtx=1532, fdx=1531, next=1532
[123058.711247] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0da10000, max=0, calc=2601, drx=2625
[123058.725999] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[123058.739078] mtk_soc_eth 1e100000.ethernet: PPE started
[130669.380348] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[130669.386614] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[130669.392739] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0da10000, max=0, ctx=2437, dtx=2437, fdx=2436, next=2437
[130669.403738] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=048b0000, max=0, calc=1261, drx=1262
[130669.416663] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x5f60000c, 0x10c = 0x80818
[130669.429230] mtk_soc_eth 1e100000.ethernet: PPE started


net/sched/sch_generic.c

NETDEV WATCHDOG:  transmit queue 0 timed out
NETDEV WATCHDOG:  transmit queue 0 timed out
NETDEV WATCHDOG:  transmit queue 0 timed out


ath9k ath9k_common <?
ath9k_hw ath <?
mac80211  <?
cfg80211 <?

DISABLE SOME OF THESE TO ELIMINATE then look at these ^ 
xt_tcpmss
xt_statistic
xt_state
xt_recent
xt_nat xt_multiport
xt_HL xt_FLOWOFFLOAD
xt_DSCP xt_CT xt_CLASSIFY
compat sch_cake

fyi, @anon50098793 if it matters others are experiencing it too: Undetermined Page Fault

Think this thread needs to merge to that one....

It has better debug action and i'm getting dizzy switching!

[390721.153731] do_page_fault(): sending SIGSEGV to netdata for invalid write access to 77dbed2c

The relevant, maintainers.... can be notified via the code sources.....