Strange USB loop

[Bjoern A. Zeeb]

On 24 Aug 2020, at 16:37, bob prohaska wrote:

> After updating to
> FreeBSD 13.0-CURRENT (GENERIC) #5 r364475: Mon Aug 24 06:47:29 PDT 2020
> on a Pi3 it was necessary to disconnect the mouse, keyboard and usb-serial
> adapter to allow the machine to mount root from USB via a hub.
>
> Once the machine came back up with root mounted from USB, I tried plugging
> the serial adapter, mouse and keyboard back in via the hub.
>
> The FTDI serial adapater was recognized without trouble, but when the
> elderly Dell mouse was connected, a stream of
>
> uhub_reattach_port: giving up port reset - device vanished
> uhub_reattach_port: giving up port reset - device vanished
> uhub_reattach_port: giving up port reset - device vanished
> uhub_reattach_port: giving up port reset - device vanished
> uhub_reattach_port: giving up port reset - device vanished
>
> began to scroll on both the monitor and console. Unplugging
> the mouse made no difference. Plugging the mouse directly
> into the Pi's USB port allowed recognition and function,
> but the stream of errors persisted. Network access seems
> normal.
>
> It looks almost as if there's some sort of infinite loop
> running in the USB software. The need to disconnect mouse
> and keyboard to permit mountroot to work isn't new, but
> the "giving up port reset" _is_ new at least to me.
>
> Are there any experiments which might narrow down what's wrong?

I hit something like it last weekend and found this one:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237666


/bz