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

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

The following reply was made to PR kern/46696; it has been noted by GNATS.

From: Andreas Gustafsson <gson%gson.org@localhost>
To: Nick Hudson <skrll%netbsd.org@localhost>
Cc: gnats-bugs%NetBSD.org@localhost,
    Andreas Gustafsson <gson%gson.org@localhost>,
    gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost,
    mishka%NetBSD.org@localhost
Subject: Re: kern/46696 (uhub disables port where USB keyboard attached)
Date: Mon, 16 Sep 2013 00:19:05 +0300

 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