usb/80685: panic in usb_cold_explore() at begining

[John Milford]

The following reply was made to PR usb/80685; it has been noted by GNATS.

From: John Milford <jwm at CSUA.Berkeley.EDU>
To: bug-followup at FreeBSD.org
Cc: rsc at merit.edu
Subject: Re: usb/80685: panic in usb_cold_explore() at begining
Date: Sat, 14 May 2005 12:22:38 -0700

 I have hit this too with 4.11-STABLE I cvsup'ed last night.  My system
 is a Dual Athlon.  If there is something I can do to help with this
 I'll take a shot at it.
 
 I say Julian had recommended some prints for debugging, and I added
 those, but without a serial console it is tough for me to see if they
 are getting printed early on.  However the only print I can see is
 right before the panic, "HEY WE GOT HERE!".
 
 printf("HEY WE GOT HERE!\n");
         KASSERT(cold || TAILQ_EMPTY(&usb_coldexplist),
             ("usb_cold_explore: busses to explore when !cold"));
         while (!TAILQ_EMPTY(&usb_coldexplist)) {
                 sc = TAILQ_FIRST(&usb_coldexplist);
                 TAILQ_REMOVE(&usb_coldexplist, sc, sc_coldexplist);
 printf("probing a USB 1.1 bus.\n");
 
 
 With my old kernel (4.11-STABLE from end of Dec.)
 
 ohci0: <OHCI (generic) USB controller> mem 0xf1000000-0xf1000fff irq
 10 at device 0.0 on pci2
 usb0: OHCI version 1.0, legacy support
 usb0: <OHCI (generic) USB controller> on ohci0
 usb0: USB revision 1.0
 uhub0: AMD OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
 uhub0: 4 ports with 4 removable, self powered
 ums0: Logitech USB Receiver, rev 1.10/16.00, addr 2, iclass 3/1
 ums0: 7 buttons and Z dir.