Strange USB loop

[bob prohaska]

On Tue, Aug 25, 2020 at 12:46:01AM +0200, Hans Petter Selasky wrote:
> On 2020-08-24 18:37, 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
> 
> You are after:
> 
> https://svnweb.freebsd.org/changeset/base/364433
> 
> You may want to try a kernel before:
> 
> r364379

A kernel for 
FreeBSD 13.0-CURRENT (GENERIC) #6 r364378: Tue Aug 25 00:46:27 PDT 2020
compiled and installed without incident, but the problem persists. This
time I plugged the keyboard into the hub and got a stream of 
uhub_reattach_port: giving up port reset - device vanished
which didn't stop when the keyboard was removed. If the keyboard is
moved to the Pi's internal USB connectors the keyboard is recognized
and works, but the once-per-second "...device vanished" messages continue.

Attempts to repeat this behavior were frustrating. After a few iterations
the error message was triggered by plugging in an FTDI usb-serial adapter,
but the messages stopped when it was unplugged. 

The hub is 
Bus /dev/usb Device /dev/ugen1.4: ID 05e3:0610 Genesys Logic, Inc. 4-port hub

The disk adapter is 
Bus /dev/usb Device /dev/ugen1.5: ID 152d:1561 JMicron Technology Corp. / JMicron USA Technology Corp. JMS561U two ports SATA 6Gb/s bridge

Are either of these known troublmakers?

Thanks for reading!

bob prohaska