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From: "John S. Dyson" <toor@dyson.iquest.net>
Message-Id: <199704101308.IAA00366@dyson.iquest.net>
Subject: Re: NFS/mmap freeze in 2.2R
In-Reply-To: <199704100622.XAA19967@newport.ece.uci.edu> from Steven Wallace at "Apr 9, 97 11:22:15 pm"
To: swallace@ece.uci.edu (Steven Wallace)
Date: Thu, 10 Apr 1997 08:08:52 -0500 (EST)
Cc: bugs@freebsd.org, current@freebsd.org
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> 
> I have discovered how to freeze the system over an NFS mounted filesystem.
> If you map a file over NFS read/write and shared, write
> to the area in memory, and then have another program read that nfs file,
> the system will freeze.  The freeze is kindof wierd though.
> It appears that the kernel is still running somehow. 
> I can change the sysconts vty's but typing and all other processes
> are frozen and not running.
> 
Sounds like a recursive VFS locking problem or somesuch.  Thanks for the
report, and will look at it ASAP.

John