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Warning: This is a more or less a copy of the initial bug report written against Raspberry Pi OS 64bits since I thought it was 64bits-specific: https://github.com/raspberrypi/Raspberry-Pi-OS-64bit/issues/178. Let me know which one should be kept.

Current behavior:

• The interface (eth0) of the integrated NIC of the SoC of my Rasperry Pi 4 (and 400) is constantly switching between "up" and "down" status, as reported by dmesg:

[13311.171718] bcmgenet fd580000.ethernet eth0: Link is Down
[13313.219840] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[13393.092824] bcmgenet fd580000.ethernet eth0: Link is Down
[13396.164840] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[13432.005229] bcmgenet fd580000.ethernet eth0: Link is Down
[13435.077479] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[13562.054861] bcmgenet fd580000.ethernet eth0: Link is Down
[13565.126956] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[13639.879848] bcmgenet fd580000.ethernet eth0: Link is Down
[13642.952052] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[13851.850591] bcmgenet fd580000.ethernet eth0: Link is Down
[13854.922580] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[14254.287566] bcmgenet fd580000.ethernet eth0: Link is Down
[14257.359734] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[14309.584214] bcmgenet fd580000.ethernet eth0: Link is Down
[14312.656314] bcmgenet fd580000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx

• This can be seen by an ssh session freezing for a while for example.

Expected behavior:

• eth0 interface stays "up" after boot
• the kernel only needs to brings up the interface once (at boot)

Steps to reproduce:

1. Flash an SD card with Raspberry Pi OS (Lite in my case) 64bits
2. Create an empty ssh file in the /boot/ directory/partition
3. Insert the SD card in a Raspberry Pi 4 or 400
4. Power up the Raspberry Pi
5. Connect via ssh to the Pi
6. Update the system (apt update && apt upgrade -y)
7. Reboot and reconnect via ssh
8. Wait for the problem to occur
9. Display the kernel buffer

Context

• This issue occurs with any fresh install of Raspberry Pi OS 64bits (I even tried with older images I still had).
• Every image was verified before flashing.
• Before reporting this issue, the system had been updated to the current versions of RPOS.
• I tried to change everything - from the power supply to the Ethernet cable, SD card, switch and even other versions of Raspberry Pi 4(00).
• Apart from the SD card, the Ethernet cable and the PSU nothing is connected to the Pi used to reproduce this issue.
• The Raspberry Pi is, of course, left in autonegociation and is assigned an IP by a DHCP server, no static IP is assigned on the device itself, not a single setting was changed.

Here are logs from a Raspberry Pi 400: rpi400_dmesg_64bits.txt

I did not find any duplicate showing this exact issue, please let me know if this is a duplicate or if I forgot any relevant detail.

Edit:

After troubleshooting for 64bits, I did the same with a 32bits version of Raspberry Pi OS, to be exhaustive, and, to my surprise, it happened as well, but at a lower frequency.

Here is the kernel log on the same device Raspberry Pi 400: rpi400_dmesg_32bits.txt

I never saw the same on my Raspberry Pi 1, 2 or 3 models B.

##Logs:

rpi4_dmesg_64bits.txt rpi400_dmesg_32bits.txt rpi400_dmesg_64bits.txt

Same problem here: Pi4, raspbian 11 32bit, with wifi and bluetooth both disabled.

I'm connected via an eth splitter (100Mb) to a MikroTik RB4011iGS router.