Comment 0 for bug 1864041

The xen_netfront device is sometimes unresponsive after a hibernate and resume event. This is limited to the c4, c5, m4, m5, r4, r5 instance families, all of which are xen based, and support hibernation.

When the issue occurrs, the instance is inaccessible without a full restart. Debugging by running a process which outputs regularly to the serial console shows that the instance is still running.

A workaround is to build the xen_netfront module separately and restart the module and networking during the resume handler. For example:

modprobe -r xen_netfront
modprobe xen_netfront
systemctl restart systemd-networkd

With this workaround in place, the unresponsive issue is no longer observed.