From owner-freebsd-usb@FreeBSD.ORG  Fri Jul 10 13:41:38 2009
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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org,
 freebsd-current@freebsd.org
Date: Fri, 10 Jul 2009 15:41:15 +0200
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Cc: Alexander Best <alexbestms@math.uni-muenster.de>
Subject: Re: detaching usb device without unmounting it
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X-List-Received-Date: Fri, 10 Jul 2009 13:41:39 -0000

This is not an USB issue.

Try -current.

--HPS

On Friday 10 July 2009 11:05:48 Alexander Best wrote:
> since the usb2 stack allows one to detach a mounted usb device without the
> kernel panic'ing i'd like to know which steps are necessary to be taken
> after detaching a device? because i tried the following:
>
> 1. attach device
> 2. mount device
> 3. detach device
>
> when i tried to unmount the device i got the follwing error message:
>
> g_vfs_done():label/usb[WRITE(offset=19456, length=4096)]error = 6
>
> and the console got locked up (ctr+c didn't work). so i tried to reboot
> using ctrl+alt+del. however after the message: "All buffers synced" there
> was no reboot. so i had to do a hard reset. however after the reset freebsd
> fsck'ed my harddrives. so they didn't unmount properly.
>
> should i have used `umount -f`? or just plug the device back in again? or
> isn't it possible to unmount a device that has already been detached?
>
> i'm running r195476 btw.
>
> alex
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