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From: Hans Petter Selasky <hselasky@c2i.net>
To: Mikle Krutov <nekoexmachina@gmail.com>
Date: Thu, 8 Apr 2010 19:29:43 +0200
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Cc: freebsd-gnats-submit@freebsd.org, freebsd-usb@freebsd.org
Subject: Re: usb/145513: New USB stack: no new devices after forced usb
	flash detach
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On Thursday 08 April 2010 19:14:03 Mikle Krutov wrote:
> On Thu, Apr 08, 2010 at 01:52:50PM +0200, Hans Petter Selasky wrote:
> > Hi,
> >
> > That's because the UMASS detach is hanging, most likely.
> >
> > Try to break into the kernel and get a backtrace.
> >
> > --HPS
> 
> Hi,
> I unfortunately could not find any info about how do i do this. Could
> you provide me some link?
> 

Add:

options         KDB                     # Enable kernel debugger support.
options         DDB                     # Support DDB.
options         GDB                     # Support remote GDB.

When it hangs, enter this from the console:

sysctl debug.kdb.panic=1

Type

alltrace

bt

bt all

or something similar.

Type "continue" when you are finished.

You can also use CTRL+ALT+ESC key combination.

--HPS