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From: Jamie Landeg-Jones <jamie@catflap.org>
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To: ronald-lists@klop.ws, david@catwhisker.org
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Subject: Re: how to find out where a umount is failing on -> vnodes: count 1 ?
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David Wolfskill <david@catwhisker.org> wrote:

> 	fstat -f /data/jails/jenkins/_root

I had a stupid moment once. "fstat -f" / "fuser -c" didn't report anything...

Turned out I had a hidden mount filesystem underneath the mountpoint, so,
Ronald, if no processes show a filesystem, make sure to check with a "df -a" !