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

[OpenWrt Bugs]

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FS#2628 - Kernel warning: eth0 (mtk_soc_eth): transmit queue 0 timed out
User who did this - Dmitry (Gektor)

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Same issue on MikroTik RBM33G
SoC Type: MediaTek MT7621 ver:1 eco:3
Linux OpenWrt 4.14.180 #0 SMP Sat May 16 18:32:20 2020 mips GNU/Linux
DISTRIB_ID='OpenWrt'
DISTRIB_RELEASE='19.07.3'
DISTRIB_REVISION='r11063-85e04e9f46'
DISTRIB_TARGET='ramips/mt7621'
DISTRIB_ARCH='mipsel_24kc'
DISTRIB_DESCRIPTION='OpenWrt 19.07.3 r11063-85e04e9f46'
DISTRIB_TAINTS=''

[140121.189586] ------------[ cut here ]------------
[140121.194302] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:320 0x8038ba10
[140121.201458] NETDEV WATCHDOG: eth0 (mtk_soc_eth): transmit queue 0 timed out
[140121.208487] Modules linked in: qcserial pppoe ppp_async option ath10k_pci ath10k_core ath usb_wwan qmi_wwan 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 usbserial usbnet 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_raw iptable_mangle iptable_filter ipt_ECN ip_tables crc_ccitt compat cdc_wdm xt_set ip_set_list_set
[140121.279359]  ip_set_hash_netportnet ip_set_hash_netport ip_set_hash_netnet ip_set_hash_netiface ip_set_hash_net ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink nf_log_ipv6 nf_log_common ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 mii leds_gpio xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd gpio_button_hotplug usbcore nls_base usb_common
[140121.323813] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.180 #0
[140121.329970] Stack : 00000000 00000000 00000000 8ff20a40 00000000 00000000 00000000 00000000
[140121.338393]         00000000 00000000 00000000 00000000 00000000 00000001 8fc09d60 ac07f5ad
[140121.346809]         8fc09df8 00000000 00000000 00007330 00000038 8049c0d8 00000008 00000000
[140121.355226]         00000000 80550000 0004f0e5 70617773 8fc09d40 00000000 00000000 8050ae44
[140121.363644]         8038ba10 00000140 00000000 8ff20a40 00000008 802accb0 00000000 806b0000
[140121.372061]         ...
[140121.374583] Call Trace:
[140121.374600] [] 0x8049c0d8
[140121.380668] [] 0x8038ba10
[140121.384223] [] 0x802accb0
[140121.387778] [] 0x8000c1a0
[140121.391334] [] 0x8000c1a8
[140121.394889] [] 0x80484f34
[140121.398443] [] 0x80071a90
[140121.402000] [] 0x8002e608
[140121.405556] [] 0x8038ba10
[140121.409111] [] 0x8002e690
[140121.412668] [] 0x8038ba10
[140121.416223] [] 0x80099940
[140121.419780] [] 0x8038b864
[140121.423334] [] 0x8008850c
[140121.426887] [] 0x8035ba9c
[140121.430444] [] 0x800887c8
[140121.433999] [] 0x800790f8
[140121.437556] [] 0x804a2ed8
[140121.441115] [] 0x80032fb4
[140121.444671] [] 0x8025a2f0
[140121.448227] [] 0x80007488
[140121.451780] 
[140121.453491] ---[ end trace ea6e6111189c7d38 ]---
[140121.458205] mtk_soc_eth 1e100000.ethernet eth0: transmit timed out
[140121.464502] mtk_soc_eth 1e100000.ethernet eth0: dma_cfg:80000065
[140121.470664] mtk_soc_eth 1e100000.ethernet eth0: tx_ring=0, base=0ec00000, max=0, ctx=2623, dtx=2623, fdx=2622, next=2623
[140121.481650] mtk_soc_eth 1e100000.ethernet eth0: rx_ring=0, base=0e2d0000, max=0, calc=3252, drx=3257
[140121.494774] mtk_soc_eth 1e100000.ethernet: 0x100 = 0x6060000c, 0x10c = 0x80818
[140121.509194] 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=2628#comment8774

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