[FS#2628] Kernel warning / crash on ramips: eth0 (mtk_soc_eth): transmit queue 0 timed out

Sun Mar 14 10:01:00 GMT 2021

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FS#2628 - Kernel warning / crash on ramips: eth0 (mtk_soc_eth): transmit queue 0 timed out
User who did this - compassnet (compassnet)

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Device: Mikrotik RB750Gr3

This problem still persists with OpenWrt 19.07.7 without crashing the router.
In my case it's rare to see it happen, but this bug is not gone.

Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.684019] ------------[ cut here ]------------
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.688743] WARNING: CPU: 2 PID: 0 at net/sched/sch_generic.c:320 0x8038d700
Sun Mar 14 00:26:24 2021 kern.info kernel: [618046.695866] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.702878] Modules linked in: pppoe ppp_async pppox ppp_generic nf_conntrack_ipv6 iptable_nat ipt_REJECT ipt_MASQUERADE 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 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 nf_conntrack iptable_mangle iptable_filter ip_tables crc_ccitt gpio_beeper input_core nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ip6_udp_tunnel udp_tunnel leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.771181] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.14.221 #0
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.777351] Stack : 00000000 00000000 00000000 8ffd2540 00000000 00000000 00000000 00000000
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.785791]         00000000 00000000 00000000 00000000 00000000 00000001 8fc0dd60 ac07f5c4
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.794213]         8fc0ddf8 00000000 00000000 00003a50 00000038 8049e2b8 00000008 00000000
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.802633]         00000000 80550000 000bc46d 70617773 8fc0dd40 00000000 00000000 8050d500
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.811055]         8038d700 00000140 00000002 8ffd2540 00000008 802ae4c0 00000008 806b0008
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.819479]         ...
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.822002] Call Trace:
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.822019] [] 0x8049e2b8
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.828090] [] 0x8038d700
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.831649] [] 0x802ae4c0
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.835210] [] 0x8000c1a0
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.838770] [] 0x8000c1a8
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.842326] [] 0x804870f4
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.845883] [] 0x80071e00
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.849443] [] 0x8002e798
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.852999] [] 0x8038d700
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.856560] [] 0x8002e820
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.860117] [] 0x800553b8
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.863672] [] 0x8038d700
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.867230] [] 0x80099da0
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.870788] [] 0x8038d554
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.874348] [] 0x80088948
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.877908] [] 0x80088c04
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.881465] [] 0x800794a8
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.885055] [] 0x804a50b8
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.888614] [] 0x80033164
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.892168] [] 0x8025b710
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.895729] [] 0x80007488
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.899284]
Sun Mar 14 00:26:24 2021 kern.warn kernel: [618046.900928] ---[ end trace 7a5a44bbe7aa90ab ]---
Sun Mar 14 00:26:24 2021 kern.err kernel: [618046.905681] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
Sun Mar 14 00:26:24 2021 kern.info kernel: [618046.911953] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
Sun Mar 14 00:26:24 2021 kern.info kernel: [618046.918056] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0e9e0000, max=0, ctx=2470, dtx=2470, fdx=2469, next=2470
Sun Mar 14 00:26:24 2021 kern.info kernel: [618046.929017] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0ee70000, max=0, calc=3218, drx=3219
Sun Mar 14 00:26:24 2021 kern.info kernel: [618046.941465] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
Sun Mar 14 00:26:24 2021 kern.info kernel: [618046.954454] mtk_soc_eth 1e100000.ethernet: PPE started

Compass.
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More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=2628#comment9486

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