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Date: Sat, 01 Sep 2007 13:06:36 +0200
From: Kris Kennaway <kris@FreeBSD.org>
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To: Per olof Ljungmark <peo@intersonic.se>
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Cc: freebsd-questions@freebsd.org
Subject: Re: g_vfs write error = 28, bad memory?
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Per olof Ljungmark wrote:
> I use a memory file system for some tmp files and last night I saw this, 
> followed by a reboot. Bad memory? 6-STABLE from April..
> 
> foo-bar kernel: g_vfs_done():md0[WRITE(offset=259244032, 
> length=131072)]error = 28
> foo-bar kernel: g_vfs_done():md0[WRITE(offset=259375104, 
> length=131072)]error = 28
> [ten more lines...]
> [reboot]
> 
> Thanks,

#define ENOSPC          28              /* No space left on device */

You are probably (incorrectly) using a malloc backed disk.  Use swap 
backing and you won't panic when memory is low.

Kris