Undetermined Page Fault

|Model|MikroTik RBM33G|
|---|---|
|Architecture|MediaTek MT7621 ver:1 eco:3|
|Firmware Version|OpenWrt 18.06.1 r7258-5eb055306f / LuCI openwrt-18.06 branch (git-18.228.31946-f64b152)|
|Kernel Version|4.14.63|
|Local Time|Tue Feb 19 15:08:37 2019|
|Uptime|5d 11h 3m 8s|
|Load Average|1.05, 0.83, 0.63|

[39584.399313] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0-3: link becomes ready
[39584.406334] br-VLAN6_UNT: port 2(wlan0-3) entered blocking state
[39584.412484] br-VLAN6_UNT: port 2(wlan0-3) entered forwarding state
[39584.427675] br-VLAN4_UNT: port 2(wlan0-4) entered blocking state
[39584.433711] br-VLAN4_UNT: port 2(wlan0-4) entered disabled state
[39584.440823] device wlan0-4 entered promiscuous mode
[39584.446742] IPv6: ADDRCONF(NETDEV_UP): wlan0-4: link is not ready
[39584.453436] br-VLAN4_UNT: port 2(wlan0-4) entered blocking state
[39584.459543] br-VLAN4_UNT: port 2(wlan0-4) entered forwarding state
[39584.807900] br-VLAN4_UNT: port 2(wlan0-4) entered disabled state
[39585.065030] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0-4: link becomes ready
[39585.072265] br-VLAN4_UNT: port 2(wlan0-4) entered blocking state
[39585.078351] br-VLAN4_UNT: port 2(wlan0-4) entered forwarding state
[119202.231737] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
[119251.709360] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
[119312.171430] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
[119331.686017] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
[390721.153731] do_page_fault(): sending SIGSEGV to netdata for invalid write access to 77dbed2c
[390721.162437] epc = 77f3ee20 in libc.so[77ec9000+92000]
[390721.167949] ra  = 0043c6fd in netdata[400000+95000]
[424279.087186] ------------[ cut here ]------------
[424279.091903] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:320 0x8036d4f8
[424279.099063] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[424279.106080] 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
[424279.176909]  cls_fw sch_tbf sch_htb sch_hfsc sch_ingress 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 leds_gpio xhci_mtk xhci_plat_hcd xhci_pci xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[424279.202721] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.63 #0
[424279.208788] Stack : 00000006 00000000 00000000 00000000 00000000 00000000 00000000 00000000
[424279.217210]         00000000 00000000 00000000 00000000 00000000 00000001 8fc0dd60 ac07f526
[424279.225628]         8fc0ddf8 00000000 00000000 0000fbb8 00000038 80476918 00000008 00000000
[424279.234046]         00000000 80520000 000317e1 70617773 8fc0dd40 00000000 80540000 8036d4f8
[424279.242469]         00000009 00000140 00000001 8fe56e40 00000000 80290678 00000004 80580004
[424279.250892]         ...
[424279.253420] Call Trace:
[424279.253438] [<80476918>] 0x80476918
[424279.259510] [<8036d4f8>] 0x8036d4f8
[424279.263077] [<80290678>] 0x80290678
[424279.266643] [<80010040>] 0x80010040
[424279.270203] [<80010048>] 0x80010048
[424279.273758] [<8045f8cc>] 0x8045f8cc
[424279.277316] [<8006f7b0>] 0x8006f7b0
[424279.280874] [<8002e388>] 0x8002e388
[424279.284434] [<8036d4f8>] 0x8036d4f8
[424279.287993] [<8002e3ec>] 0x8002e3ec
[424279.291549] [<8005440c>] 0x8005440c
[424279.295104] [<8036d4f8>] 0x8036d4f8
[424279.298661] [<80096d20>] 0x80096d20
[424279.302216] [<8036d34c>] 0x8036d34c
[424279.305773] [<80086354>] 0x80086354
[424279.309333] [<8008656c>] 0x8008656c
[424279.312889] [<80076b90>] 0x80076b90
[424279.316490] [<8047ce10>] 0x8047ce10
[424279.320050] [<80032ab4>] 0x80032ab4
[424279.323607] [<802491cc>] 0x802491cc
[424279.327171] [<8000b4e8>] 0x8000b4e8
[424279.330729] 
[424279.332386] ---[ end trace a0774e3f687ef3ea ]---
[424279.337088] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[424279.343361] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[424279.349486] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0ea30000, max=0, ctx=2047, dtx=2047, fdx=2046, next=2047
[424279.360428] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0e1f0000, max=0, calc=146, drx=147
[424279.372568] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[424279.385183] mtk_soc_eth 1e100000.ethernet: PPE started `

Same problem here : DLink DIR-860L B1
Firmware Version : OpenWrt SNAPSHOT r9419-d9ab3240a5 / LuCI Master (git-19.052.76823-1cd72ff)

[16265.079886] ------------[ cut here ]------------
[16265.089122] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:320 dev_watchdog+0x1ac/0x324
[16265.105597] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[16265.119482] Modules linked in: pppoe ppp_async pppox ppp_generic mt76x2e mt76x2_common mt76x02_lib mt76 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 slhc nf_reject_ipv4 nf_nat_redirect nf_nat_masquerade_ipv4 nf_conntrack_ipv4 nf_nat_ipv4 nf_log_ipv4 nf_flow_table_hw nf_flow_table nf_defrag_ipv4 nf_conntrack_rtcache iptable_raw iptable_mangle iptable_filter ipt_ECN ip6table_raw ip_tables crc_ccitt compat act_connmark cls_matchall act_skbedit act_mirred em_u32 cls_u32 cls_tcindex cls_flow cls_route cls_fw cls_basic
[16265.261077]  sch_tbf sch_htb sch_hfsc sch_ingress ledtrig_usbport cryptodev ip6t_NPT ip6t_MASQUERADE nf_nat_masquerade_ipv6 ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 nf_nat nf_conntrack ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables x_tables ifb tun sha512_generic sha256_generic seqiv jitterentropy_rng drbg hmac ghash_generic gf128mul gcm ctr authenc leds_gpio xhci_mtk xhci_plat_hcd xhci_pci xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[16265.351447] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.102 #0
[16265.363560] Stack : 00000000 87f9ae40 80580000 80074018 805a0000 805471b0 00000000 00000000
[16265.380189]         805131dc 87c09dc4 8058135c 80580ee7 8050e068 00000001 87c09d68 53261687
[16265.396815]         00000000 00000000 805e0000 00005d10 00000000 0000011c 00000008 00000000
[16265.413446]         00000000 80580000 00055cd7 00000000 00000000 00000000 805a0000 803697a8
[16265.430086]         00000009 00000140 00000000 87f9ae40 00000000 80292bc0 00000000 805e0000
[16265.446712]         ...
[16265.451567] Call Trace:
[16265.456447] [<800106c0>] show_stack+0x58/0x100
[16265.465295] [<804507ec>] dump_stack+0x9c/0xe0
[16265.473961] [<80032a28>] __warn+0xe0/0x114
[16265.482101] [<80032a8c>] warn_slowpath_fmt+0x30/0x3c
[16265.491987] [<803697a8>] dev_watchdog+0x1ac/0x324
[16265.501363] [<8008b054>] call_timer_fn.isra.3+0x24/0x84
[16265.511752] [<8008b270>] run_timer_softirq+0x1bc/0x248
[16265.521985] [<8046dc00>] __do_softirq+0x128/0x2ec
[16265.531341] [<800371b4>] irq_exit+0xac/0xc8
[16265.539658] [<802465cc>] plat_irq_dispatch+0xfc/0x138
[16265.549701] [<8000b5e8>] except_vec_vi_end+0xb8/0xc4
[16265.559570] [<8000cfb0>] r4k_wait_irqoff+0x1c/0x24
[16265.569093] [<8006af1c>] do_idle+0xe4/0x168
[16265.577414] [<8006b198>] cpu_startup_entry+0x24/0x2c
[16265.587295] [<805a7bf0>] start_kernel+0x484/0x4a4
[16265.596879] ---[ end trace 3d22476bf5b5195f ]---
[16265.606105] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[16265.618461] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[16265.630457] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=06d00000, max=0, ctx=1839, dtx=1839, fdx=1838, next=1839
[16265.652122] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=06290000, max=0, calc=3086, drx=3113
[16265.674810] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[16265.694740] mtk_soc_eth 1e100000.ethernet: PPE started

Light shedding on stack trace in dmesg looks like its being addressed here.

Not sure if its related but I'm seeing this posted quite frequently, its still happening in 18.06.2 build:

Tue Mar 12 13:34:34 2019 kern.info kernel: [67508.608247] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
Tue Mar 12 13:34:37 2019 kern.info kernel: [67511.399512] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
Tue Mar 12 13:36:41 2019 kern.info kernel: [67636.117419] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
Tue Mar 12 13:36:44 2019 kern.info kernel: [67638.914500] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
Tue Mar 12 13:37:05 2019 kern.info kernel: [67660.082141] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
Tue Mar 12 13:37:08 2019 kern.info kernel: [67662.837129] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
Tue Mar 12 13:37:14 2019 kern.info kernel: [67668.242163] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
Tue Mar 12 13:37:16 2019 kern.info kernel: [67671.025557] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
Tue Mar 12 13:37:20 2019 kern.info kernel: [67674.362291] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
Tue Mar 12 13:37:23 2019 kern.info kernel: [67677.210627] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
Tue Mar 12 13:37:36 2019 kern.info kernel: [67690.682753] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
Tue Mar 12 13:37:39 2019 kern.info kernel: [67693.505558] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up
Tue Mar 12 13:37:41 2019 kern.info kernel: [67695.783240] mtk_soc_eth 1e100000.ethernet eth0: port 0 link down
Tue Mar 12 13:37:44 2019 kern.info kernel: [67698.554572] mtk_soc_eth 1e100000.ethernet eth0: port 0 link up