[FS#3821] Random link down on RB 750Gr3

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - P. Ierunie (pierunie) 

Attached to Project - OpenWrt/LEDE Project
Summary - Random link down on RB 750Gr3
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Critical
Priority - Very Low
Reported Version - openwrt-21.02
Due in Version - Undecided
Due Date - Undecided
Details - HW: Mikrotik Routerboard 750Gr3
SW: linux version 5.4.119 (cezary at eko.one.pl) (gcc version 8.4.0 (OpenWrt GCC 8.4.0 r15819-0011c7ad12)) #0 SMP Fri May 14 21:36:47 2021

I am randomly loosing connection with the router for a few seconds. Here is the system log after the link is reestablished: 

Sat May 22 16:32:05 2021 kern.info kernel: [24372.328509] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:05 2021 kern.info kernel: [24372.333341] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:05 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:06 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:06 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:09 2021 kern.info kernel: [24376.424716] mt7530 mdio-bus:1f lan2: Link is Up - 1Gbps/Full - flow control rx/tx
Sat May 22 16:32:09 2021 kern.info kernel: [24376.432249] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:09 2021 kern.info kernel: [24376.437506] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:09 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:09 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:09 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat May 22 16:32:10 2021 kern.info kernel: [24377.448578] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:10 2021 kern.info kernel: [24377.453413] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:10 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:11 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:11 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:13 2021 kern.info kernel: [24380.520779] mt7530 mdio-bus:1f lan2: Link is Up - 1Gbps/Full - flow control rx/tx
Sat May 22 16:32:13 2021 kern.info kernel: [24380.528342] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:13 2021 kern.info kernel: [24380.533562] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:13 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:13 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:13 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat May 22 16:32:14 2021 kern.info kernel: [24381.544635] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:14 2021 kern.info kernel: [24381.549486] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:14 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:15 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:15 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:17 2021 kern.info kernel: [24384.616828] mt7530 mdio-bus:1f lan2: Link is Up - 1Gbps/Full - flow control rx/tx
Sat May 22 16:32:17 2021 kern.info kernel: [24384.624361] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:17 2021 kern.info kernel: [24384.629611] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:17 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:17 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:17 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat May 22 16:32:18 2021 kern.info kernel: [24385.640683] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:18 2021 kern.info kernel: [24385.645511] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:18 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:19 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:19 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:21 2021 kern.info kernel: [24388.712887] mt7530 mdio-bus:1f lan2: Link is Up - 1Gbps/Full - flow control rx/tx
Sat May 22 16:32:21 2021 kern.info kernel: [24388.720458] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:21 2021 kern.info kernel: [24388.725684] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:21 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:21 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:21 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat May 22 16:32:22 2021 kern.info kernel: [24389.736743] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:22 2021 kern.info kernel: [24389.741572] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:22 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:23 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:23 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:25 2021 kern.info kernel: [24392.808941] mt7530 mdio-bus:1f lan2: Link is Up - 1Gbps/Full - flow control rx/tx
Sat May 22 16:32:25 2021 kern.info kernel: [24392.816473] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:25 2021 kern.info kernel: [24392.821720] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:25 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:25 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:25 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat May 22 16:32:26 2021 kern.info kernel: [24393.832799] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:26 2021 kern.info kernel: [24393.837630] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:26 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:27 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:27 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:30 2021 kern.info kernel: [24396.904992] mt7530 mdio-bus:1f lan2: Link is Up - 1Gbps/Full - flow control rx/tx
Sat May 22 16:32:30 2021 kern.info kernel: [24396.912523] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:30 2021 kern.info kernel: [24396.917771] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:30 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:30 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:30 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat May 22 16:32:31 2021 kern.info kernel: [24397.928855] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:31 2021 kern.info kernel: [24397.933692] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:31 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:32 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:32 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:34 2021 kern.info kernel: [24401.001066] mt7530 mdio-bus:1f lan2: Link is Up - 1Gbps/Full - flow control rx/tx
Sat May 22 16:32:34 2021 kern.info kernel: [24401.008643] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:34 2021 kern.info kernel: [24401.013868] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:34 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:34 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:34 2021 daemon.notice netifd: Interface 'lan' has link connectivity
Sat May 22 16:32:35 2021 kern.info kernel: [24402.024917] mt7530 mdio-bus:1f lan2: Link is Down
Sat May 22 16:32:35 2021 kern.info kernel: [24402.029756] br-lan: port 1(lan2) entered disabled state
Sat May 22 16:32:35 2021 daemon.notice netifd: Network device 'lan2' link is down
Sat May 22 16:32:36 2021 daemon.notice netifd: bridge 'br-lan' link is down
Sat May 22 16:32:36 2021 daemon.notice netifd: Interface 'lan' has link connectivity loss
Sat May 22 16:32:41 2021 kern.info kernel: [24408.169236] mt7530 mdio-bus:1f lan2: Link is Up - 100Mbps/Full - flow control rx/tx
Sat May 22 16:32:41 2021 kern.info kernel: [24408.176955] br-lan: port 1(lan2) entered blocking state
Sat May 22 16:32:41 2021 kern.info kernel: [24408.182189] br-lan: port 1(lan2) entered forwarding state
Sat May 22 16:32:41 2021 daemon.notice netifd: Network device 'lan2' link is up
Sat May 22 16:32:41 2021 daemon.notice netifd: bridge 'br-lan' link is up
Sat May 22 16:32:41 2021 daemon.notice netifd: Interface 'lan' has link connectivity
 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3821

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