Proxmox E1000

This became more prominent in Proxmox 8.4.1 for me but some logs are still present in older versions as well.

journalctl -n 2000 | grep "Detected Hardware Unit Hang"

Would show something like

Apr 30 21:20:43 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:45 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:47 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:49 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:51 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:53 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:55 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:57 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:20:59 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:21:01 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:21:03 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:21:05 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:21:07 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:21:09 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:21:11 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:
Apr 30 21:21:13 pve04 kernel: e1000e 0000:00:1f.6 eno1: Detected Hardware Unit Hang:

Until the host becomes unresponsive

Seems to be a known issue with larger files and offloading

• https://www.reddit.com/r/Proxmox/comments/1drs89s/intel_nic_e1000e_hardware_unit_hang/
• https://forum.proxmox.com/threads/intel-nic-e1000e-hardware-unit-hang.106001/post-765582

Fix

Test out (replace eno1 with interface name)

ethtool -K eno1 tso off gso off

More permanent fix would be to add it to the interfaces config

auto lo
iface lo inet loopback

iface eno1 inet manual

auto vmbr0
iface vmbr0 inet static
        address 192.168.1.4/24
        gateway 192.168.1.1
        bridge-ports eno1
        bridge-stp off
        bridge-fd 0
        bridge-vlan-aware yes
        bridge-vids 2-4094        
        post-up /sbin/ethtool -K eno1 tso off gso off
source /etc/network/interfaces.d/*

Another way would be to create a service like cryp0rr has donehttps://gist.github.com/crypt0rr/60aaabd4a5c29a256b4f276122765237

1. Create a new service file

nano /etc/systemd/system/disable-offloading.service 

[Unit]
Description=Disable NIC offloading
After=network.target

[Service]
Type=oneshot
ExecStart=/sbin/ethtool -K en01 tso off gso off
RemainAfterExit=true

[Install]
WantedBy=multi-user.target

1. Load the service and enable

systemctl daemon-reexec && systemctl daemon-reload && systemctl enable disable-offloading.service