If using chrome://inspect to do port forwarding and/or remote inspection of Chrome on a device, Perfetto will fail to record traces on the device with this unhelpful error:

    A WebUSB error occurred
    ✕
    Is adb already running on the host? Run this command and try again.
    > adb kill-server

    
    For details see b/159048331

At the very least, this error message could be improved for non-googlers. But ideally, it would be able to work simultaneously. If that's not possible, it would be nice at least if Perfetto could do port forwarding itself.