Hello!
I have a Xiaomi router 4A gigabit edition runnin openwrt 23.05.5. The problem is that the router randomly reboots, sometimes 10 days, sometimes 1 days. I already this problem persisted with older firmwares as well. The kernel log shows this:
Dec 22 18:41:24 router kernel: [404633.847124] Ignoring NSS change in VHT Operating Mode Notification from 60:f1:89:f0:0d:b5 with invalid nss 2
Dec 22 18:41:24 router kernel: [444414.403570] CM_ERROR=2002b480 COH_RD_ERR <CCA=5 TR=mmio MCmd=Coherent Read Share STag=0 SPort=0
Dec 22 18:41:24 router kernel: [444414.403570] >
Dec 22 18:41:24 router kernel: [444414.423856] CM_ADDR =1c000000
Dec 22 18:41:24 router kernel: [444414.426896] CM_OTHER=00000000 None
Dec 22 18:41:24 router kernel: [444414.430368] Data bus error, epc == 803a0d54, ra == 80608a18
Dec 22 18:41:24 router kernel: [444414.436004] Oops[#1]:
Dec 22 18:41:24 router kernel: [444414.438352] CPU: 0 PID: 281 Comm: napi/mtk_eth-6 Not tainted 5.15.167 #0
Dec 22 18:41:24 router kernel: [444414.445116] $ 0 : 00000000 00000001 ca86e39b 00000001
Dec 22 18:41:24 router kernel: [444414.450426] $ 4 : 9c000000 ffff008c 0651a3a6 00000558
Dec 22 18:41:24 router kernel: [444414.455735] $ 8 : 00000000 00000000 00000000 00000000
Dec 22 18:41:24 router kernel: [444414.461040] $12 : 00000000 24f97c04 69cf9673 00000001
Dec 22 18:41:24 router kernel: [444414.466354] $16 : 8431de40 82b517ff 8431de40 80010a00
Dec 22 18:41:24 router kernel: [444414.471660] $20 : 8431de40 00000558 805f2d30 00000000
Dec 22 18:41:24 router kernel: [444414.476968] $24 : 01cd6831 806084fc
Dec 22 18:41:24 router kernel: [444414.482276] $28 : 80da4000 80da5970 0000884e 80608a18
Dec 22 18:41:24 router kernel: [444414.487581] Hi : 00005fff
Dec 22 18:41:24 router kernel: [444414.490533] Lo : 2e48f657
Dec 22 18:41:24 router kernel: [444414.493481] epc : 803a0d54 0x803a0d54
Dec 22 18:41:24 router kernel: [444414.497389] ra : 80608a18 0x80608a18
Dec 22 18:41:24 router kernel: [444414.501299] Status: 11000403#011KERNEL EXL IE
Dec 22 18:41:24 router kernel: [444414.505561] Cause : 4080001c (ExcCode 07)
Dec 22 18:41:24 router kernel: [444414.509635] PrId : 0001992f (MIPS 1004Kc)
Dec 22 18:41:24 router kernel: [444414.513798] Modules linked in: pppoe ppp_async nft_fib_inet nf_flow_table_ipv6 nf_flow_table_ipv4 nf_flow_table_inet wireguard pppox ppp_generic nft_reject_ipv6 nft_reject_ipv4 nft_reject_inet nft_reject nft_redir nft_quota nft_objref nft_numgen nft_nat nft_masq nft_log nft_limit nft_hash nft_flow_offload nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_ct nft_counter nft_chain_nat nf_tables nf_nat nf_flow_table nf_conntrack mt76x2e mt76x2_common mt76x02_lib mt7603e mt76 mac80211 libchacha20poly1305 cfg80211 slhc poly1305_mips nfnetlink nf_reject_ipv6 nf_reject_ipv4 nf_log_syslog nf_defrag_ipv6 nf_defrag_ipv4 libcurve25519_generic libcrc32c crc_ccitt compat chacha_mips ip6_udp_tunnel udp_tunnel sha512_generic seqiv jitterentropy_rng drbg kpp hmac cmac leds_gpio gpio_button_hotplug crc32c_generic
Dec 22 18:41:24 router kernel: [444414.583374] Process napi/mtk_eth-6 (pid: 281, threadinfo=bd21d1d1, task=74174ddc, tls=00000000)
Dec 22 18:41:24 router kernel: [444414.592137] Stack : fffba200 8101b798 8200c524 fffffffe 82b40800 80048600 00000000 0000ef0f
Dec 22 18:41:24 router kernel: [444414.600583] 8431de40 00000058 00000014 00000000 00000058 00000000 00000000 00000000
Dec 22 18:41:24 router kernel: [444414.609028] 00000006 80622120 83ad5724 838ce100 8200c524 fffffffe 00000000 000054b3
Dec 22 18:41:24 router kernel: [444414.617472] 8431de40 00000000 00000000 00000000 80da5a60 0000058c 808d441e 808d2f00
Dec 22 18:41:24 router kernel: [444414.625911] 80820000 80523770 00000058 00000001 00000020 83ad9334 80820000 00000000
Dec 22 18:41:24 router kernel: [444414.634348] ...
Dec 22 18:41:24 router kernel: [444414.636875] Call Trace:
Dec 22 18:41:24 router kernel: [444414.636914] [<80048600>] 0x80048600
Dec 22 18:41:24 router kernel: [444414.642991] [<80622120>] 0x80622120
Dec 22 18:41:24 router kernel: [444414.646549] [<83ad5724>] 0x83ad5724 [wireguard@3e02df35+0xd350]
Dec 22 18:41:24 router kernel: [444414.652545] [<80523770>] 0x80523770
Dec 22 18:41:24 router kernel: [444414.656108] [<83ad9334>] 0x83ad9334 [wireguard@3e02df35+0xd350]
Dec 22 18:41:24 router kernel: [444414.662097] [<80523864>] 0x80523864
Dec 22 18:41:24 router kernel: [444414.665677] [<83ad2e88>] 0x83ad2e88 [wireguard@3e02df35+0xd350]
Dec 22 18:41:24 router kernel: [444414.671671] [<80523a44>] 0x80523a44
Dec 22 18:41:24 router kernel: [444414.675239] [<80524540>] 0x80524540
Dec 22 18:41:24 router kernel: [444414.678797] [<80523d30>] 0x80523d30
Dec 22 18:41:24 router kernel: [444414.682361] [<80629734>] 0x80629734
Dec 22 18:41:24 router kernel: [444414.685926] [<805249a8>] 0x805249a8
Dec 22 18:41:24 router kernel: [444414.689502] [<8053608c>] 0x8053608c
What can cause this problem?