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Date: Thu, 12 Jan 2006 22:28:54 -0500
From: Rashkae <rashkae@tigershaunt.com>
To: adam.nielsen@uq.edu.au
Cc: linux-kernel@vger.kernel.org
Subject: "umount: device is busy" when device is not in use?
Message-ID: <20060113032854.GA3591@tigershaunt.com>
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fuser -m /mnt/data will list the process ID of any process using the mount.

If your feeling brave, fuser -mk will just kill them.