Adding device crashes HA

[akramer]

I've got the current stable version of HA running on an RPI4 through hass.

When I attempt to add my EMU-2 through a direct USB connection, Home Assistant locks up solid. The Pi 4 still responds, if I'm sshed in it still works, but I get nothing further in the HA logs until a power cycle.

I also tried with the EMU-2 plugged into a powered hub, and had the same result.

Is there a way I can get better diagnostic information? I ran HA with DEBUG logs enabled and still didn't see anything useful output when I attempted to add the EMU-2. The device add screen shows /dev/ttyACM0 and knows it's an EMU-2 device (it recognizes it as a new device), but once I choose the port and tell it to add, bam, hang.