Netgear R6220 (MT7621) crashing

I see random crashes on my device, almost 1-2 per day.
I am using 19.07.2
The crashlog:

^Croot@gw:~# cat /sys/kernel/debug/crashlog
Time: 1585821024.419662
Modules:	pppoe@86d8c000+23e0	ppp_async@86d86000+1b90	pppox@87676000+4b0	ppp_generic@86d18000+5970	nf_conntrack_ipv6@86c76000+1590	mt76x2e@86c60000+26c0	mt76x2_common@86c4c000+2a40	mt76x02_lib@86c50000+9640	mt7603e@87790000+90a0	mt76@877e0000+7920	mac80211@86f80000+6c840	iptable_nat@8776c000+2c0	ipt_REJECT@8775d000+3c0	ipt_MASQUERADE@87734000+2a0	cfg80211@86f00000+36b80	xt_time@8775f000+6e0	xt_tcpudp@87687000+700	xt_state@87735000+2c0	xt_nat@87730000+600	xt_multiport@8777b000+500xt_mark@87777000+2a0	xt_mac@87775000+260	xt_limit@87773000+4a0	xt_conntrack@87770000+900	xt_comment@8773d000+1e0	xt_TCPMSS@8776a000+ae0	xt_REDIRECT@87759000+2c0	xt_LOG@8773c000+300	xt_FLOWOFFLOAD@8775e000+c10	xt_CT@876b4000+a60	slhc@87768000+13c0	nf_reject_ipv4@8772f000+840	nf_nat_redirect@8772a000+580	nf_nat_masquerade_ipv4@8772d000+650	nf_conntrack_ipv4@87762000+1420	nf_nat_ipv4@87736000+f30	nf_nat@87764000+37d0	nf_log_ipv4@87731000+d60	nf_flow_table_hw@87721000+8d0	nf_flow_table@87754000+3350	nf_defrag_ipv6@8766a000+12e0	nf_defrag_ipv4@8771f000+440	nf_conntrack_rtcache@87663000+aa0	nf_conntrack@87740000+10550	iptable_mangle@87720000+380	iptable_filter@876da000+280	ip_tables@87678000+2b30	crc_ccitt@876b5000+3e0	compat@8766c000+1740	ledtrig_usbport@8771e000+ab0	nf_log_ipv6@87666000+1020	nf_log_common@876bf000+aa0	ip6table_mangle@87686000+4a0	ip6table_filter@876b6000+280	ip6_tables@87714000+2a20	ip6t_REJECT@876a6000+400	x_tables@8768c000+3290	nf_reject_ipv6@876a7000+9e0	tun@87680000+5de0	leds_gpio@87592000+b60	xhci_plat_hcd@87590000+15c0	xhci_pci@875b3000+bc0	xhci_mtk@875ac000+1460	xhci_hcd@87600000+160f0	gpio_button_hotplug@875a8000+1ac0	usbcore@875e0000+1fd50	nls_base@8758e000+1430	usb_common@8758d000+8c0
<14>[   12.089464] procd: - init -
<14>[   12.835902] kmodloader: loading kernel modules from /etc/modules.d/*
<6>[   12.858216] tun: Universal TUN/TAP device driver, 1.6
<6>[   12.965682] ip6_tables: (C) 2000-2006 Netfilter Core Team
<6>[   12.987270] Loading modules backported from Linux version v4.19.98-0-gd183c8e2647a
<6>[   13.002398] Backport generated by backports.git v4.19.98-1-0-g8204eb99
<6>[   13.018586] ip_tables: (C) 2000-2006 Netfilter Core Team
<6>[   13.038245] nf_conntrack version 0.5.0 (2048 buckets, 8192 max)
<6>[   13.099710] xt_time: kernel timezone is -0000
<14>[   13.147618] urngd: v1.0.2 started.
<4>[   13.248255] bus=0x2, slot = 0x1, irq=0xff
<6>[   13.256549] mt7603e 0000:02:00.0: ASIC revision: 76030010
<5>[   13.334522] random: crng init done
<5>[   13.341289] random: 6 urandom warning(s) missed due to ratelimiting
<6>[   14.292607] mt7603e 0000:02:00.0: Firmware Version: ap_pcie
<6>[   14.303817] mt7603e 0000:02:00.0: Build Time: 20160107100755
<6>[   14.351407] mt7603e 0000:02:00.0: firmware init done
<7>[   14.530376] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
<4>[   14.546337] bus=0x1, slot = 0x0, irq=0xff
<6>[   14.554701] mt76x2e 0000:01:00.0: ASIC revision: 76120044
<6>[   15.276074] mt76x2e 0000:01:00.0: ROM patch build: 20141115060606a
<6>[   15.292076] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
<6>[   15.303034] mt76x2e 0000:01:00.0: Build: 1
<6>[   15.311172] mt76x2e 0000:01:00.0: Build Time: 201507311614____
<6>[   15.341411] mt76x2e 0000:01:00.0: Firmware running!
<7>[   15.353890] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
<6>[   15.364715] PPP generic driver version 2.4.2
<6>[   15.376604] NET: Registered protocol family 24
<14>[   15.390046] kmodloader: done loading kernel modules from /etc/modules.d/*
<6>[   23.395670] mtk_soc_eth 1e100000.ethernet: PPE started
<6>[   23.436744] device eth0 entered promiscuous mode
<6>[   23.456506] br-vlan1: port 1(eth0.1) entered blocking state
<6>[   23.467762] br-vlan1: port 1(eth0.1) entered disabled state
<6>[   23.479368] device eth0.1 entered promiscuous mode
<6>[   23.520558] br-vlan1: port 1(eth0.1) entered blocking state
<6>[   23.531729] br-vlan1: port 1(eth0.1) entered forwarding state
<6>[   23.543573] IPv6: ADDRCONF(NETDEV_UP): br-vlan1: link is not ready
<6>[   23.777399] br-vlan3: port 1(eth0.3) entered blocking state
<6>[   23.788569] br-vlan3: port 1(eth0.3) entered disabled state
<6>[   23.800318] device eth0.3 entered promiscuous mode
<6>[   23.838006] br-vlan3: port 1(eth0.3) entered blocking state
<6>[   23.849187] br-vlan3: port 1(eth0.3) entered forwarding state
<6>[   24.402108] IPv6: ADDRCONF(NETDEV_CHANGE): br-vlan1: link becomes ready
<6>[   25.808030] pppoe-wan: renamed from ppp0
<6>[   27.442157] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
<6>[   27.480279] br-vlan1: port 2(wlan0) entered blocking state
<6>[   27.491470] br-vlan1: port 2(wlan0) entered disabled state
<6>[   27.503094] device wlan0 entered promiscuous mode
<6>[   27.783761] pppoe-wan: renamed from ppp0
<6>[   28.801288] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
<6>[   28.856056] br-vlan1: port 3(wlan1) entered blocking state
<6>[   28.867093] br-vlan1: port 3(wlan1) entered disabled state
<6>[   28.878866] device wlan1 entered promiscuous mode
<6>[   29.667207] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
<6>[   29.680657] br-vlan1: port 2(wlan0) entered blocking state
<6>[   29.691713] br-vlan1: port 2(wlan0) entered forwarding state
<6>[   29.733438] IPv6: ADDRCONF(NETDEV_UP): wlan0-1: link is not ready
<6>[   29.765141] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0-1: link becomes ready
<6>[   29.783267] pppoe-wan: renamed from ppp0
<6>[   31.527995] pppoe-wan: renamed from ppp0
<6>[   33.348232] pppoe-wan: renamed from ppp0
<6>[   34.497677] pppoe-wan: renamed from ppp0
<6>[   35.969389] pppoe-wan: renamed from ppp0
<6>[   37.395458] pppoe-wan: renamed from ppp0
<6>[   38.997896] pppoe-wan: renamed from ppp0
<6>[   40.612017] pppoe-wan: renamed from ppp0
<6>[   41.859745] pppoe-wan: renamed from ppp0
<6>[   43.455363] pppoe-wan: renamed from ppp0
<6>[   44.902654] pppoe-wan: renamed from ppp0
<6>[   46.210475] pppoe-wan: renamed from ppp0
<6>[   47.597677] pppoe-wan: renamed from ppp0
<6>[   48.944341] pppoe-wan: renamed from ppp0
<6>[   50.226747] pppoe-wan: renamed from ppp0
<6>[   51.579396] pppoe-wan: renamed from ppp0
<6>[   53.069116] pppoe-wan: renamed from ppp0
<6>[   54.549137] pppoe-wan: renamed from ppp0
<6>[   55.938022] pppoe-wan: renamed from ppp0
<6>[   57.412838] pppoe-wan: renamed from ppp0
<6>[   58.927317] pppoe-wan: renamed from ppp0
<6>[   60.273820] pppoe-wan: renamed from ppp0
<6>[   61.667674] pppoe-wan: renamed from ppp0
<6>[   63.001772] pppoe-wan: renamed from ppp0
<6>[   64.337830] pppoe-wan: renamed from ppp0
<6>[   65.700037] pppoe-wan: renamed from ppp0
<6>[   67.099031] pppoe-wan: renamed from ppp0
<6>[   68.638540] pppoe-wan: renamed from ppp0
<6>[   70.039166] pppoe-wan: renamed from ppp0
<6>[   71.410676] pppoe-wan: renamed from ppp0
<6>[   72.849750] pppoe-wan: renamed from ppp0
<6>[   74.259995] pppoe-wan: renamed from ppp0
<6>[   75.652033] pppoe-wan: renamed from ppp0
<6>[   77.125327] pppoe-wan: renamed from ppp0
<6>[   78.542663] pppoe-wan: renamed from ppp0
<6>[   79.798302] pppoe-wan: renamed from ppp0
<6>[   81.256369] pppoe-wan: renamed from ppp0
<6>[   82.680373] pppoe-wan: renamed from ppp0
<6>[  106.670153] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
<6>[  106.683483] br-vlan1: port 3(wlan1) entered blocking state
<6>[  106.694471] br-vlan1: port 3(wlan1) entered forwarding state
<6>[  106.711824] IPv6: ADDRCONF(NETDEV_UP): wlan1-1: link is not ready
<6>[  106.731977] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1-1: link becomes ready
<6>[  335.038336] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[  335.050061] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[  335.062552] device wlan1-1.1 entered promiscuous mode
<6>[  335.073224] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[  335.084934] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[ 7693.001807] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[ 7693.016497] device wlan1-1.1 left promiscuous mode
<6>[ 7693.026157] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[ 7699.786667] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[ 7699.798413] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[ 7699.810718] device wlan1-1.1 entered promiscuous mode
<6>[ 7699.821269] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[ 7699.832980] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[15057.800289] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[15057.814865] device wlan1-1.1 left promiscuous mode
<6>[15057.824500] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[17989.779080] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[17989.790810] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[17989.803238] device wlan1-1.1 entered promiscuous mode
<6>[17989.813912] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[17989.825627] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[18989.209226] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[18989.223935] device wlan1-1.1 left promiscuous mode
<6>[18989.233581] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[25206.391635] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[25206.403580] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[25206.416163] device wlan1-1.1 entered promiscuous mode
<6>[25206.426541] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[25206.438231] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[28928.450978] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[28928.465637] device wlan1-1.1 left promiscuous mode
<6>[28928.475296] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[32427.405026] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[32427.416807] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[32427.429052] device wlan1-1.1 entered promiscuous mode
<6>[32427.439415] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[32427.451116] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[33446.710585] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[33446.725258] device wlan1-1.1 left promiscuous mode
<6>[33446.735110] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[36056.468752] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[36056.480635] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[36056.493104] device wlan1-1.1 entered promiscuous mode
<6>[36056.503614] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[36056.515319] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[37047.612645] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[37047.627242] device wlan1-1.1 left promiscuous mode
<6>[37047.637035] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[42611.309877] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[42611.321616] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[42611.334222] device wlan1-1.1 entered promiscuous mode
<6>[42611.344735] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[42611.356442] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[42631.603313] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[42631.618462] device wlan1-1.1 left promiscuous mode
<6>[42631.628090] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[48183.192258] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[48183.204021] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[48183.216522] device wlan1-1.1 entered promiscuous mode
<6>[48183.227222] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[48183.238938] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[48226.063616] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[48226.079245] device wlan1-1.1 left promiscuous mode
<6>[48226.088879] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[48787.209691] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[48787.221389] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[48787.233735] device wlan1-1.1 entered promiscuous mode
<6>[48787.244298] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[48787.255967] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[48834.305578] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[48834.321085] device wlan1-1.1 left promiscuous mode
<6>[48834.330744] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[49625.572126] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[49625.584065] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[49625.596569] device wlan1-1.1 entered promiscuous mode
<6>[49625.607113] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[49625.618779] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<6>[49628.715345] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[49628.730760] device wlan1-1.1 left promiscuous mode
<6>[49628.740446] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[52068.251815] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[52068.263862] br-vlan1: port 4(wlan1-1.1) entered disabled state
<6>[52068.276199] device wlan1-1.1 entered promiscuous mode
<6>[52068.286885] br-vlan1: port 4(wlan1-1.1) entered blocking state
<6>[52068.298605] br-vlan1: port 4(wlan1-1.1) entered forwarding state
<1>[65232.233594] CPU 1 Unable to handle kernel paging request at virtual address 07406000, epc == 8010e830, ra == 803446b0
<4>[65232.255313] Oops[#1]:
<4>[65232.259844] CPU: 1 PID: 31050 Comm: fw3 Not tainted 4.14.171 #0
<4>[65232.271617] task: 860dbfc0 task.stack: 854b2000
<4>[65232.280619] $ 0   : 00000000 00000001 07406000 00b7c000
<4>[65232.291022] $ 4   : 8054a1e8 014000c0 81128640 8056deb4
<4>[65232.301423] $ 8   : 000e20cd 002c93b9 80340bd0 00000000
<4>[65232.311821] $12   : 7f8748e0 00000000 00000000 00000080
<4>[65232.322219] $16   : 87deb000 014000c0 07406000 014080c0
<4>[65232.332618] $20   : 87af3080 8056bba0 00000000 806edf64
<4>[65232.343016] $24   : 77f6b52c 77f3fed4                  
<4>[65232.353416] $28   : 854b2000 854b3e10 8050a1d8 803446b0
<4>[65232.363818] Hi    : 00000000
<4>[65232.369536] Lo    : 00000030
<4>[65232.375259] epc   : 8010e830 0x8010e830
<4>[65232.382875] ra    : 803446b0 0x803446b0
<4>[65232.390491] Status: 11007c03	KERNEL EXL IE 
<4>[65232.398817] Cause : 40800008 (ExcCode 02)
<4>[65232.406783] BadVA : 07406000
<4>[65232.412499] PrId  : 0001992f (MIPS 1004Kc)
<4>[65232.420632] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 iptable_nat ipt_REJECT ipt_MASQUERADE cfg80211 xt_time xt_tcpudp xt_state xt_nat xt_multiport xt_mark xt_mac xt_limit xt_conntrack xt_comment xt_TCPMSS xt_REDIRECT xt_LOG xt_FLOWOFFLOAD xt_CT 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 nf_conntrack iptable_mangle iptable_filter ip_tables crc_ccitt compat ledtrig_usbport nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 tun leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
<4>[65232.562414] Process fw3 (pid: 31050, threadinfo=854b2000, task=860dbfc0, tls=77f9befc)
<4>[65232.578154] Stack : 80510000 80508fa0 854b3e8c 86d982c0 8056e8a0 8056deb4 87deb000 803446b0
<4>[65232.594788]         87af3174 87af3180 87af3140 87af30a0 87af3080 8056e8a0 00000000 8056deb4
<4>[65232.611421]         00000002 803447b4 87948c38 87af30a0 7f874b7c 87af30a0 87c1f000 8056e8a0
<4>[65232.628052]         00000011 00000002 8056deb4 803e7fd8 00000000 7f874b7c 00080001 00000000
<4>[65232.644684]         00000000 87948c88 87948c38 8050b7e8 804cd940 87af3080 00000002 00000001
<4>[65232.661317]         ...
<4>[65232.666177] Call Trace:
<4>[65232.666217] [<803446b0>] 0x803446b0
<4>[65232.677994] [<803447b4>] 0x803447b4
<4>[65232.684931] [<803e7fd8>] 0x803e7fd8
<4>[65232.691866] [<8033ef58>] 0x8033ef58
<4>[65232.698804] [<80340c1c>] 0x80340c1c
<4>[65232.705739] [<8016c690>] 0x8016c690
<4>[65232.712670] [<80015578>] 0x80015578
<4>[65232.719605] 
<4>[65232.722555] Code: 00000000  8e020014  02421021 <8c470000> 41666000  30c60001  000000c0  8f85000c  8e020000 
<4>[65232.741958] 
<4>[65232.749889] ---[ end trace ae16c70847e96489 ]---

===================================

There is a particular error with R6220s you might be running into. What OpenWrt version are you running, and what does the bootlog say?

I am running 19.07.2, I don't think this is the case though, I have never experienced the MAC address problems, even on previous versions I used to run.

root@gw:~# dmesg 
[    0.000000] Linux version 4.14.171 (builder@buildhost) (gcc version 7.5.0 (OpenWrt GCC 7.5.0 r10947-65030d81f3)) #0 SMP Thu Feb 27 21:05:12 2020
[    0.000000] SoC Type: MediaTek MT7621 ver:1 eco:3
[    0.000000] bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[    0.000000] MIPS: machine is Netgear R6220
[    0.000000] Determined physical RAM map:
[    0.000000]  memory: 08000000 @ 00000000 (usable)
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] VPE topology {2} total 2
[    0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[    0.000000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000]   HighMem  empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] On node 0 totalpages: 32768
[    0.000000] free_area_init_node: node 0, pgdat 805727a0, node_mem_map 81003000
[    0.000000]   Normal zone: 256 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 32768 pages, LIFO batch:7
[    0.000000] random: get_random_bytes called from 0x80575744 with crng_init=0
[    0.000000] percpu: Embedded 14 pages/cpu s26224 r8192 d22928 u57344
[    0.000000] pcpu-alloc: s26224 r8192 d22928 u57344 alloc=14*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32512
[    0.000000] Kernel command line: console=ttyS0,57600 rootfstype=squashfs,jffs2
[    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Writing ErrCtl register=00022000
[    0.000000] Readback ErrCtl register=00022000
[    0.000000] Memory: 122620K/131072K available (4746K kernel code, 241K rwdata, 588K rodata, 1260K init, 255K bss, 8452K reserved, 0K cma-reserved, 0K highmem)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
[    0.000000] Hierarchical RCU implementation.
[    0.000000] 	RCU restricting CPUs from NR_CPUS=4 to nr_cpu_ids=2.
[    0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=2
[    0.000000] NR_IRQS: 256
[    0.000000] CPU Clock: 880MHz
[    0.000000] clocksource: GIC: mask: 0xffffffffffffffff max_cycles: 0xcaf478abb4, max_idle_ns: 440795247997 ns
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 4343773742 ns
[    0.000009] sched_clock: 32 bits at 440MHz, resolution 2ns, wraps every 4880645118ns
[    0.015488] Calibrating delay loop... 586.13 BogoMIPS (lpj=2930688)
[    0.087792] pid_max: default: 32768 minimum: 301
[    0.097088] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.110103] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[    0.125647] Hierarchical SRCU implementation.
[    0.134906] smp: Bringing up secondary CPUs ...
[    0.158499] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[    0.158507] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[    0.158518] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[    0.158645] CPU1 revision is: 0001992f (MIPS 1004Kc)
[    0.204377] Synchronize counters for CPU 1: done.
[    0.264036] smp: Brought up 1 node, 2 CPUs
[    0.275723] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.295192] futex hash table entries: 512 (order: 2, 16384 bytes)
[    0.307413] pinctrl core: initialized pinctrl subsystem
[    0.319168] NET: Registered protocol family 16
[    0.334550] FPU Affinity set after 11720 emulations
[    0.335474] pull PCIe RST: RALINK_RSTCTRL = 0
[    0.644410] release PCIe RST: RALINK_RSTCTRL = 7000000
[    0.654484] ***** Xtal 40MHz *****
[    0.661206] release PCIe RST: RALINK_RSTCTRL = 7000000
[    0.671414] Port 0 N_FTS = 1b105000
[    0.678309] Port 1 N_FTS = 1b102800
[    0.685233] Port 2 N_FTS = 1b105000
[    1.843464] PCIE1 no card, disable it(RST&CLK)
[    1.852155]  -> 12007f2
[    1.856973] PCIE0 enabled
[    1.862168] PCIE2 enabled
[    1.867352] PCI host bridge /pcie@1e140000 ranges:
[    1.876878]  MEM 0x0000000060000000..0x000000006fffffff
[    1.887233]   IO 0x000000001e160000..0x000000001e16ffff
[    1.897603] PCI coherence region base: 0xbfbf8000, mask/settings: 0x60000000
[    1.923441] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    1.934804] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    1.946089] mt7621_gpio 1e000600.gpio: registering 32 gpios
[    1.959135] PCI host bridge to bus 0000:00
[    1.967215] pci_bus 0000:00: root bus resource [mem 0x60000000-0x6fffffff]
[    1.980822] pci_bus 0000:00: root bus resource [io  0xffffffff]
[    1.992553] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    2.006031] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    2.021810] pci 0000:00:00.0: [0e8d:0801] type 01 class 0x060400
[    2.021850] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x7fffffff]
[    2.021862] pci 0000:00:00.0: reg 0x14: [mem 0x60300000-0x6030ffff]
[    2.021929] pci 0000:00:00.0: supports D1
[    2.021938] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[    2.022230] pci 0000:00:01.0: [0e8d:0801] type 01 class 0x060400
[    2.022266] pci 0000:00:01.0: reg 0x10: [mem 0x00000000-0x7fffffff]
[    2.022284] pci 0000:00:01.0: reg 0x14: [mem 0x60310000-0x6031ffff]
[    2.022356] pci 0000:00:01.0: supports D1
[    2.022369] pci 0000:00:01.0: PME# supported from D0 D1 D3hot
[    2.022925] pci 0000:01:00.0: [14c3:7662] type 00 class 0x028000
[    2.022997] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x000fffff 64bit]
[    2.023053] pci 0000:01:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
[    2.023155] pci 0000:01:00.0: PME# supported from D0 D3hot D3cold
[    2.023355] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[    2.023615] pci 0000:02:00.0: [14c3:7603] type 00 class 0x028000
[    2.023673] pci 0000:02:00.0: reg 0x10: [mem 0x00000000-0x000fffff]
[    2.023822] pci 0000:02:00.0: PME# supported from D0 D3hot D3cold
[    2.024016] pci_bus 0000:02: busn_res: [bus 02-ff] end is updated to 02
[    2.024039] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 02
[    2.024116] pci 0000:00:00.0: BAR 0: no space for [mem size 0x80000000]
[    2.037155] pci 0000:00:00.0: BAR 0: failed to assign [mem size 0x80000000]
[    2.050961] pci 0000:00:01.0: BAR 0: no space for [mem size 0x80000000]
[    2.064095] pci 0000:00:01.0: BAR 0: failed to assign [mem size 0x80000000]
[    2.077917] pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x600fffff]
[    2.091406] pci 0000:00:00.0: BAR 9: assigned [mem 0x60100000-0x601fffff pref]
[    2.105743] pci 0000:00:01.0: BAR 8: assigned [mem 0x60200000-0x602fffff]
[    2.119215] pci 0000:00:00.0: BAR 1: assigned [mem 0x60300000-0x6030ffff]
[    2.132709] pci 0000:00:01.0: BAR 1: assigned [mem 0x60310000-0x6031ffff]
[    2.146186] pci 0000:01:00.0: BAR 0: assigned [mem 0x60000000-0x600fffff 64bit]
[    2.160700] pci 0000:01:00.0: BAR 6: assigned [mem 0x60100000-0x6010ffff pref]
[    2.175034] pci 0000:00:00.0: PCI bridge to [bus 01]
[    2.184865] pci 0000:00:00.0:   bridge window [mem 0x60000000-0x600fffff]
[    2.198360] pci 0000:00:00.0:   bridge window [mem 0x60100000-0x601fffff pref]
[    2.212706] pci 0000:02:00.0: BAR 0: assigned [mem 0x60200000-0x602fffff]
[    2.226185] pci 0000:00:01.0: PCI bridge to [bus 02]
[    2.236011] pci 0000:00:01.0:   bridge window [mem 0x60200000-0x602fffff]
[    2.251379] clocksource: Switched to clocksource GIC
[    2.262676] NET: Registered protocol family 2
[    2.272266] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[    2.286026] TCP bind hash table entries: 1024 (order: 1, 8192 bytes)
[    2.298620] TCP: Hash tables configured (established 1024 bind 1024)
[    2.311371] UDP hash table entries: 256 (order: 1, 8192 bytes)
[    2.322868] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
[    2.335506] NET: Registered protocol family 1
[    2.344104] PCI: CLS 0 bytes, default 32
[    2.581329] 4 CPUs re-calibrate udelay(lpj = 2924544)
[    2.592371] Crashlog allocated RAM at address 0x3f00000
[    2.603131] workingset: timestamp_bits=30 max_order=15 bucket_order=0
[    2.624292] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    2.635822] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    2.658977] io scheduler noop registered
[    2.666679] io scheduler deadline registered (default)
[    2.677975] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    2.694675] console [ttyS0] disabled
[    2.701771] 1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 15, base_baud = 3125000) is a 16550A
[    2.719667] console [ttyS0] enabled
[    2.733466] bootconsole [early0] disabled
[    2.751555] MediaTek Nand driver init, version v2.1 Fix AHB virt2phys error
[    2.765611] Enable NFI Clock
[    2.771360] # MTK NAND # : Use HW ECC
[    2.778653] Device not found, ID: c2f1
[    2.786110] Not Support this Device! 
[    2.793569] chip_mode=00000001
[    2.799632] Support this Device in MTK table! c2f1 
[    2.809525] [NAND]select ecc bit:4, sparesize :64 spare_per_sector=16
[    2.822398] nand: device found, Manufacturer ID: 0xc2, Chip ID: 0xf1
[    2.835049] nand: Macronix NAND 128MiB 3,3V 8-bit
[    2.844415] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64
[    2.859502] Scanning device for bad blocks
[    3.015373] Bad eraseblock 629 at 0x000004ea0000
[    3.117066] 6 fixed-partitions partitions found on MTD device MT7621-NAND
[    3.130586] Creating 6 MTD partitions on "MT7621-NAND":
[    3.140998] 0x000000000000-0x000000100000 : "u-boot"
[    3.152082] 0x000000100000-0x000000200000 : "SC PID"
[    3.163044] 0x000000200000-0x000000600000 : "kernel"
[    3.174101] 0x000000600000-0x000002200000 : "ubi"
[    3.184767] 0x000002e00000-0x000002f00000 : "factory"
[    3.195914] 0x000004200000-0x000007e00000 : "reserved"
[    3.207704] [mtk_nand] probe successfully!
[    3.216585] Signature matched and data read!
[    3.225093] load_fact_bbt success 1023
[    3.233343] libphy: Fixed MDIO Bus: probed
[    3.313947] libphy: mdio: probed
[    4.720011] mtk_soc_eth 1e100000.ethernet: loaded mt7530 driver
[    4.732546] mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 17
[    4.752266] NET: Registered protocol family 10
[    4.762738] Segment Routing with IPv6
[    4.770115] NET: Registered protocol family 17
[    4.779053] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    4.804844] 8021q: 802.1Q VLAN Support v1.8
[    4.813646] random: fast init done
[    4.816453] UBI: auto-attach mtd3
[    4.827078] ubi0: attaching mtd3
[    4.925989] mtk_soc_eth 1e100000.ethernet eth0: port 4 link up
[    5.089405] ubi0: scanning is finished
[    5.102517] mtk_soc_eth 1e100000.ethernet eth0: port 2 link up
[    5.113140] ubi0: attached mtd3 (name "ubi", size 28 MiB)
[    5.124879] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[    5.138563] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[    5.152076] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
[    5.165938] ubi0: good PEBs: 224, bad PEBs: 0, corrupted PEBs: 0
[    5.177889] ubi0: user volume: 2, internal volumes: 1, max. volumes count: 128
[    5.192268] ubi0: max/mean erase counter: 133/87, WL threshold: 4096, image sequence number: 856267455
[    5.210803] ubi0: available PEBs: 0, total reserved PEBs: 224, PEBs reserved for bad PEB handling: 20
[    5.229191] ubi0: background thread "ubi_bgt0d" started, PID 359
[    5.231061] block ubiblock0_0: created from ubi0:0(rootfs)
[    5.252123] ubiblock: device ubiblock0_0 (rootfs) set to be root filesystem
[    5.265991] hctosys: unable to open rtc device (rtc0)
[    5.276295] usb_vbus: disabling
[    5.289628] VFS: Mounted root (squashfs filesystem) readonly on device 254:0.
[    5.308100] Freeing unused kernel memory: 1260K
[    5.317173] This architecture does not have kernel memory protection.
[    5.791798] init: Console is alive
[    5.798824] init: - watchdog -
[    6.408633] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    6.521454] usbcore: registered new interface driver usbfs
[    6.532509] usbcore: registered new interface driver hub
[    6.543232] usbcore: registered new device driver usb
[    6.560468] xhci-mtk 1e1c0000.xhci: 1e1c0000.xhci supply vusb33 not found, using dummy regulator
[    6.578198] xhci-mtk 1e1c0000.xhci: xHCI Host Controller
[    6.588841] xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 1
[    6.611522] xhci-mtk 1e1c0000.xhci: hcc params 0x01401198 hci version 0x96 quirks 0x0000000000210010
[    6.629807] xhci-mtk 1e1c0000.xhci: irq 16, io mem 0x1e1c0000
[    6.642326] hub 1-0:1.0: USB hub found
[    6.649870] hub 1-0:1.0: 2 ports detected
[    6.658551] xhci-mtk 1e1c0000.xhci: xHCI Host Controller
[    6.669202] xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 2
[    6.684129] xhci-mtk 1e1c0000.xhci: Host supports USB 3.0  SuperSpeed
[    6.697125] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[    6.714178] hub 2-0:1.0: USB hub found
[    6.721754] hub 2-0:1.0: 1 port detected
[    6.734776] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    6.751750] init: - preinit -
[    6.817026] mtk_soc_eth 1e100000.ethernet eth0: port 1 link up
[    7.488204] mtk_soc_eth 1e100000.ethernet: PPE started
[    7.578599] random: procd: uninitialized urandom read (4 bytes read)
[   10.727052] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 464
[   10.799729] UBIFS (ubi0:1): recovery needed
[   11.094268] UBIFS (ubi0:1): recovery completed
[   11.103257] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "rootfs_data"
[   11.118852] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[   11.138601] UBIFS (ubi0:1): FS size: 21458944 bytes (20 MiB, 169 LEBs), journal size 1015809 bytes (0 MiB, 8 LEBs)
[   11.159285] UBIFS (ubi0:1): reserved for root: 1013558 bytes (989 KiB)
[   11.172296] UBIFS (ubi0:1): media format: w4/r0 (latest is w5/r0), UUID 068E5F6A-A846-464E-B06E-9B3AD7FFC9C3, small LPT model
[   11.204844] mount_root: switching to ubifs overlay
[   11.240636] urandom-seed: Seeding with /etc/urandom.seed
[   11.348974] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[   11.376499] procd: - early -
[   11.382360] procd: - watchdog -
[   12.081535] procd: - watchdog -
[   12.088102] procd: - ubus -
[   12.166675] random: ubusd: uninitialized urandom read (4 bytes read)
[   12.182914] random: ubusd: uninitialized urandom read (4 bytes read)
[   12.195976] random: ubusd: uninitialized urandom read (4 bytes read)
[   12.209539] procd: - init -
[   12.954763] kmodloader: loading kernel modules from /etc/modules.d/*
[   12.976983] tun: Universal TUN/TAP device driver, 1.6
[   13.083120] ip6_tables: (C) 2000-2006 Netfilter Core Team
[   13.104798] Loading modules backported from Linux version v4.19.98-0-gd183c8e2647a
[   13.119911] Backport generated by backports.git v4.19.98-1-0-g8204eb99
[   13.136079] ip_tables: (C) 2000-2006 Netfilter Core Team
[   13.156023] nf_conntrack version 0.5.0 (2048 buckets, 8192 max)
[   13.214278] xt_time: kernel timezone is -0000
[   13.271106] urngd: v1.0.2 started.
[   13.361507] bus=0x2, slot = 0x1, irq=0xff
[   13.369714] mt7603e 0000:02:00.0: ASIC revision: 76030010
[   13.454091] random: crng init done
[   13.460861] random: 6 urandom warning(s) missed due to ratelimiting
[   14.412608] mt7603e 0000:02:00.0: Firmware Version: ap_pcie
[   14.423792] mt7603e 0000:02:00.0: Build Time: 20160107100755
[   14.471386] mt7603e 0000:02:00.0: firmware init done
[   14.648175] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[   14.664435] bus=0x1, slot = 0x0, irq=0xff
[   14.672736] mt76x2e 0000:01:00.0: ASIC revision: 76120044
[   15.395935] mt76x2e 0000:01:00.0: ROM patch build: 20141115060606a
[   15.411903] mt76x2e 0000:01:00.0: Firmware Version: 0.0.00
[   15.422881] mt76x2e 0000:01:00.0: Build: 1
[   15.431018] mt76x2e 0000:01:00.0: Build Time: 201507311614____
[   15.461401] mt76x2e 0000:01:00.0: Firmware running!
[   15.473970] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   15.484727] PPP generic driver version 2.4.2
[   15.496460] NET: Registered protocol family 24
[   15.509308] kmodloader: done loading kernel modules from /etc/modules.d/*
[   23.663208] mtk_soc_eth 1e100000.ethernet: PPE started
[   23.704455] device eth0 entered promiscuous mode
[   23.731928] br-vlan1: port 1(eth0.1) entered blocking state
[   23.743153] br-vlan1: port 1(eth0.1) entered disabled state
[   23.754734] device eth0.1 entered promiscuous mode
[   23.784897] br-vlan1: port 1(eth0.1) entered blocking state
[   23.796085] br-vlan1: port 1(eth0.1) entered forwarding state
[   23.808023] IPv6: ADDRCONF(NETDEV_UP): br-vlan1: link is not ready
[   24.036957] br-vlan3: port 1(eth0.3) entered blocking state
[   24.048128] br-vlan3: port 1(eth0.3) entered disabled state
[   24.059979] device eth0.3 entered promiscuous mode
[   24.105053] br-vlan3: port 1(eth0.3) entered blocking state
[   24.116216] br-vlan3: port 1(eth0.3) entered forwarding state
[   24.722007] IPv6: ADDRCONF(NETDEV_CHANGE): br-vlan1: link becomes ready
[   26.195172] pppoe-wan: renamed from ppp0
[   27.761805] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[   27.804744] br-vlan1: port 2(wlan0) entered blocking state
[   27.815773] br-vlan1: port 2(wlan0) entered disabled state
[   27.827387] device wlan0 entered promiscuous mode
[   28.126492] pppoe-wan: renamed from ppp0
[   29.064243] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
[   29.139751] br-vlan1: port 3(wlan1) entered blocking state
[   29.150967] br-vlan1: port 3(wlan1) entered disabled state
[   29.162498] device wlan1 entered promiscuous mode
[   29.822774] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[   29.835882] br-vlan1: port 2(wlan0) entered blocking state
[   29.846864] br-vlan1: port 2(wlan0) entered forwarding state
[   29.879289] IPv6: ADDRCONF(NETDEV_UP): wlan0-1: link is not ready
[   29.905673] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0-1: link becomes ready
[   30.329927] pppoe-wan: renamed from ppp0
[   31.865620] pppoe-wan: renamed from ppp0
[   33.772785] pppoe-wan: renamed from ppp0
[   35.171604] pppoe-wan: renamed from ppp0
[   38.351149] pppoe-wan: renamed from ppp0
[   39.419333] pppoe-wan: renamed from ppp0
[   40.880606] pppoe-wan: renamed from ppp0
[   41.958830] pppoe-wan: renamed from ppp0
[   43.244932] pppoe-wan: renamed from ppp0
[   44.477583] pppoe-wan: renamed from ppp0
[   45.796403] pppoe-wan: renamed from ppp0
[   46.969988] pppoe-wan: renamed from ppp0
[   48.205076] pppoe-wan: renamed from ppp0
[   49.308046] pppoe-wan: renamed from ppp0
[   50.544927] pppoe-wan: renamed from ppp0
[   51.910440] pppoe-wan: renamed from ppp0
[   53.190702] pppoe-wan: renamed from ppp0
[   54.388246] pppoe-wan: renamed from ppp0
[   55.660775] pppoe-wan: renamed from ppp0
[   56.725904] pppoe-wan: renamed from ppp0
[   57.993616] pppoe-wan: renamed from ppp0
[   59.111196] pppoe-wan: renamed from ppp0
[   60.329911] pppoe-wan: renamed from ppp0
[   61.437609] pppoe-wan: renamed from ppp0
[   62.649335] pppoe-wan: renamed from ppp0
[   63.828127] pppoe-wan: renamed from ppp0
[   65.202378] pppoe-wan: renamed from ppp0
[   66.373931] pppoe-wan: renamed from ppp0
[   67.509256] pppoe-wan: renamed from ppp0
[   68.636835] pppoe-wan: renamed from ppp0
[   69.893666] pppoe-wan: renamed from ppp0
[   70.981256] pppoe-wan: renamed from ppp0
[   72.113596] pppoe-wan: renamed from ppp0
[   73.205415] pppoe-wan: renamed from ppp0
[  106.689180] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[  106.702719] br-vlan1: port 3(wlan1) entered blocking state
[  106.713697] br-vlan1: port 3(wlan1) entered forwarding state
[  106.736127] IPv6: ADDRCONF(NETDEV_UP): wlan1-1: link is not ready
[  106.757075] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1-1: link becomes ready

It's not just MAC address problems, but, yeah, 19.07.2 already has the fix for that particular issue, and your NAND seems to be spotless anyway. My R6220 has been running non-stop for months now, I can't really contribute anything else to help you, sorry.

Hi there!

Just registered to mention that I've had exactly same problem and same logs.
I did revert to 19.07.0 and now it's running stable. How did you overcome this?

Hi, I didn't overcome this but the crashes are rare, the device hasn't crashed for the last 3 days.
Im nut sure I tried 19.07.0 but I am quite sure the problem also existed in 19.07.0-rc2.

Since this device also uses the 7530 switch, you might be interested in reading the comments on this request: https://github.com/openwrt/openwrt/pull/2847

Seems that code fixes a couple of issues.

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It seems that after updating to 19.07.3, those random crashes have stopped. My router is up for almost two weeks.