From owner-freebsd-hackers  Fri Feb 13 17:01:10 1998
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To: rhh@ct.picker.com
Cc: hackers@FreeBSD.ORG
Subject: Re: "mount /dev/fd0 /" == REBOOT! (?)
In-Reply-To: Your message of "Fri, 13 Feb 1998 16:42:31 -0500"
References: <19980213164231.23272@ct.picker.com>
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Date: Sat, 14 Feb 1998 02:00:49 +0100
From: Tor Egge <Tor.Egge@idi.ntnu.no>
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>      mount /dev/fd0 /
> 
> I was surprised when the above command rebooted my machine.  Is this
> correct behavior?  This is on 3.0-971208-SNAP BTW.

This is a known problem (assuming that you got a panic: lockmgr:
locking against myself). The mount system call has an exclusive lock
on '/' while ffs_mount tries to perform a lookup on '/dev/rfd0'.

PR kern/434, kern/1031, kern/1067, kern/2174 reports the same problem.

I've sent a suggested fix for PR#1067.

- Tor Egge

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