From owner-freebsd-stable@FreeBSD.ORG  Sat Mar 31 21:23:37 2007
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From: "Brian A. Seklecki" <bseklecki@collaborativefusion.com>
To: Maxim Khitrov <mkhitrov@gmail.com>
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Organization: Collaborative Fusion, Inc.
Date: Sat, 31 Mar 2007 16:23:51 -0500
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Cc: freebsd-stable@freebsd.org
Subject: Re: USB devices fail to re-attach on 6.2
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On Sat, 2007-03-31 at 13:26 -0500, Maxim Khitrov wrote:
> umass-sim0

Can you show us your dmesg(8) output as you disconnect and reconnect a
device.

Are you being careful to umount the file systems on these scsi devices
between detaching the underlying USB device?

~BAS