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Subject: Re: usbconfig just hangs
To: Matthias Apitz <guru@unixarea.de>, freebsd-usb@freebsd.org,
 Alexander Motin <mav@FreeBSD.org>
References: <20160413085212.GA3064@c720-r292778-amd64>
From: Hans Petter Selasky <hps@selasky.org>
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Date: Wed, 13 Apr 2016 11:02:56 +0200
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On 04/13/16 10:52, Matthias Apitz wrote:
> just hangs forever. What do I wrong?
>
> 	matthias

Hi,

It means a USB kernel device driver did not detach. Historically there 
has been several issues in cam/scsi where detaching the instance hangs.

Try running kgdb and backtrace all USB process treads. Look for "detach" 
keyword.

I've been thinking to maybe catch signals during the sx locking so that 
usbconfig can be CTRL-C'ed.

--HPS