From owner-freebsd-hackers  Sat May 17 17:47:16 1997
Return-Path: <owner-hackers>
Received: (from root@localhost)
          by hub.freebsd.org (8.8.5/8.8.5) id RAA21862
          for hackers-outgoing; Sat, 17 May 1997 17:47:16 -0700 (PDT)
Received: from dyson.iquest.net (dyson.iquest.net [198.70.144.127])
          by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id RAA21857
          for <hackers@FreeBSD.ORG>; Sat, 17 May 1997 17:47:13 -0700 (PDT)
Received: (from root@localhost)
	by dyson.iquest.net (8.8.5/8.8.5) id TAA01353;
	Sat, 17 May 1997 19:47:04 -0500 (EST)
From: "John S. Dyson" <toor@dyson.iquest.net>
Message-Id: <199705180047.TAA01353@dyson.iquest.net>
Subject: Re: newfs hangs my system?
In-Reply-To: <Pine.GSO.3.95.970517182448.21528R-100000@tor-adm1.nbc.netcom.ca> from Brian Tao at "May 17, 97 06:27:42 pm"
To: taob@nbc.netcom.ca (Brian Tao)
Date: Sat, 17 May 1997 19:47:04 -0500 (EST)
Cc: handy@sag.space.lockheed.com, hackers@FreeBSD.ORG
X-Mailer: ELM [version 2.4ME+ PL31 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: owner-hackers@FreeBSD.ORG
X-Loop: FreeBSD.org
Precedence: bulk

> On Mon, 12 May 1997, Brian N. Handy wrote:
> > 
> > And I've figured out my problem.  I was doing
> > 
> > 	newfs [options] /dev/ccd0c
> > 
> > And I shoulda been doing
> > 
> > 	newfs [options] /dev/rccd0c
> 
>     I reported this problem in freebsd-stable (search the archives for
> the subject "System freezes with 2.2-970420") on April 28, and a few
> others have confirmed the problem.  Justin said he was going to
> investigate with some drives he had, but I haven't heard anything else
> about it recently.
>
The hang associated with doing lots of I/O through a layer like
CCD is likely a deadlock indirectly associated with the vfs_bio
code.

John