[FS#3092] Xiaomi Router 3G random reboots

[OpenWrt Bugs]

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FS#3092 - Xiaomi Router 3G random reboots
User who did this - lukasz (lukasz)

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I can confirm sporadic (rare) restarts of mikrotik rb750gr3 (similar hardware).

Unfortunately i can't provide crashlog because don't have console connected.
Restarts first observed in 18.06.2, then 18.06.4, and now 19.07.3.
I also experience 1 hang of 19.03.3 (need to power off and then on).

>From time to time kernel show error "transmit queue 0 timed out" like this and device continue to run without restart:

[609182.643915] ------------[ cut here ]------------
[609182.648631] WARNING: CPU: 1 PID: 0 at net/sched/sch_generic.c:320 0x8038ba10
[609182.655775] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[609182.662797] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 iptable_nat ipt_REJECT ipt_MASQUERADE 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 usblp 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_raw iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt act_connmark nf_conntrack sch_tbf sch_ingress sch_htb sch_hfsc em_u32 cls_u32 cls_tcindex cls_route cls_matchall cls_fw cls_flow
[609182.733462]  cls_basic act_skbedit act_mirred mtk_hsdma virt_dma ledtrig_usbport gpio_beeper input_core nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ifb ip6_udp_tunnel udp_tunnel mmc_block sdhci_pltfm sdhci mtk_sd mmc_core leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[609182.767194] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.14.180 #0
[609182.773359] Stack : 00000000 00000000 00000000 8fe43240 00000000 00000000 00000000 00000000
[609182.781796]         00000000 00000000 00000000 00000000 00000000 00000001 8fc0bd60 ac07f5ad
[609182.790244]         8fc0bdf8 00000000 00000000 00004240 00000038 8049c0d8 00000008 00000000
[609182.798678]         00000000 80550000 000bb4da 70617773 8fc0bd40 00000000 00000000 8050ae44
[609182.807098]         8038ba10 00000140 00000001 8fe43240 00000008 802accb0 00000004 806b0004
[609182.815520]         ...
[609182.818042] Call Trace:
[609182.818083] [] 0x8049c0d8
[609182.824161] [] 0x8038ba10
[609182.827723] [] 0x802accb0
[609182.831288] [] 0x8000c1a0
[609182.834845] [] 0x8000c1a8
[609182.838401] [] 0x80484f34
[609182.841960] [] 0x80071a90
[609182.845534] [] 0x8002e608
[609182.849091] [] 0x8038ba10
[609182.852646] [] 0x8002e690
[609182.856220] [] 0x8038ba10
[609182.859776] [] 0x80099940
[609182.863331] [] 0x8038b864
[609182.866892] [] 0x8008850c
[609182.870455] [] 0x800887c8
[609182.874018] [] 0x800790f8
[609182.877587] [] 0x804a2ed8
[609182.881145] [] 0x80032fb4
[609182.884706] [] 0x8025a2f0
[609182.888271] [] 0x80007488
[609182.891829]
[609182.893503] ---[ end trace a9ebad8999b3bea3 ]---
[609182.898275] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[609182.904615] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[609182.910709] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0e080000, max=0, ctx=1225, dtx=1225, fdx=1224, next=1225
[609182.921670] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0ec10000, max=0, calc=2709, drx=2710
[609182.934369] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[609182.947113] mtk_soc_eth 1e100000.ethernet: PPE started
[615029.688475] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[615029.694756] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[615029.700873] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0e320000, max=0, ctx=2031, dtx=2031, fdx=2030, next=2031
[615029.711829] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0d9e0000, max=0, calc=3559, drx=3560
[615029.724293] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[615029.736930] mtk_soc_eth 1e100000.ethernet: PPE started

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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3092#comment8490

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