Re: kern/46696 (uhub disables port where USB keyboard attached)

[Andreas Gustafsson <gson%gson.org@localhost>]

Hi Nick,

You wrote:
> What's your full dmesg?

The one in http://gnats.netbsd.org/48214 will do (same machine, same
-current, and even happened to hit this bug in that particular boot).

> The output from usbdebug and uhubdebug set to 11 would be helpful.

I changed the initializations of usbdebug and uhubdebug to 11 in usb.c
and uhub.c, respectively, and built a kernel with options USB_DEBUG
and MSGBUFSIZE=262144 (but not UHUB_DEBUG, an oversight on my part).
Your patch was applied.

This kernel booted successfully 25 times in a row without problems.
Looks like we are dealing with a Heisenbug.

To double-check, I set usbdebug and uhubdebug back to 0 by patching
the kernel binary and rebooted again, and the problem was back.  The
output was now a bit more verbose than without the USB_DEBUG option
(despite usbdebug being 0):

  uhub3: 8 ports with 8 removable, self powered
  usbd_new_device: set address 3 failed
  uhub_explore: usbd_new_device failed, error=SET_ADDR_FAILED
  uhub2: device problem, disabling port 3

I'm not including the usbdebug=11 output here since it doesn't show
the problem happening, but if you want it anyway, let me know.
-- 
Andreas Gustafsson, gson%gson.org@localhost