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Date: Sat, 25 Mar 1995 03:59:29 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199503241759.DAA29812@godzilla.zeta.org.au>
To: freebsd-bugs@FreeBSD.org, jali@oce.nl
Subject: Re: Endless kernel error message loop
Sender: bugs-owner@FreeBSD.org
Precedence: bulk

> * The program below, straight from Steven's "Advanced Programming In The
> * Unix Environment", crashes FreeBSD 1.1.5.1 and FreeBSD 2.0-RELEASE.
> *
> * When compiled and run as 'a.out a.out z', it results in an endless loop
> * in the kernel, printing the message: 'vnode pager write error: 5'.
> * A forced reset and a reboot is needed.
> * Funny thing is that if the file to copy is within a pagesize (4K) it
> * works fine. If the file is bigger than 4K, things go wrong.

It works a bit better under -current.  `a.out a.out z' doesn't cause any
kernel printfs, but after `cp /bin/bash /tmp' and `a.out bash z', `rm z'
causes the kernel printfs:

    vnode_pager_output: attempt to write meta-data!!! == -xfffe8000
    vnode_pager_output: attempt to write meta-data!!! == -xfffe9000

and then `a.out bash z' causes the kernel printf:

    free inode //506 had 400 blocks

`z' had inode 506 but only 32 512-byte blocks.

Bruce