High CPU usage after updating to v2023.5.4

Today I noticed my Home Assistant instance has much higher CPU than usual (~5% previously vs ~45% now) and the increase appears to coincide with the v2023.5.4 update. The high CPU usage has been persistent for the last 48 hours.

I’ve manually checked all addons and none of them are showing much if any CPU usage. Also, when SSHing into Home Assistant it’s not showing any processes using CPU. I imagine this is because the SSH session is within a container.

Is this a known issue? Are there any other steps I ca take to identify the source of the high CPU load?

By SSHing into the HA OS and running top I’ve managed to track this issue down to “DNS fallback”.

I was able to fix it by by following the instructions in this thread and running ha dns options --fallback=false. Things are now back to normal.