Date: Sun, 2 Sep 2007 14:00:05 +1000 (EST) From: Ian Smith <smithi@nimnet.asn.au> To: Kris Kennaway <kris@FreeBSD.org> Cc: freebsd-questions@FreeBSD.org Subject: Re: g_vfs write error = 28, bad memory? Message-ID: <Pine.BSF.3.96.1070902134256.28594A-100000@gaia.nimnet.asn.au> In-Reply-To: <20070902000629.3FE7016A4C1@hub.freebsd.org>
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On Sat, 01 Sep 2007 19:34:41 +0200 Kris Kennaway <kris@FreeBSD.org> wrote:
> Per olof Ljungmark wrote:
> > Kris Kennaway wrote:
> >> Per olof Ljungmark wrote:
> >>> Kris Kennaway wrote:
> >>>> 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.
> >>>
> >>> Yes, sounds likely, thanks. One more question then, where is the md
> >>> information stored through a reboot? I did not edit rc.conf or fstab
> >>> or kernel config but still /dev/md0 came back up. Hmmm.
> >>
> >> It's not, unless something is explicitly creating it each time you
> >> boot. Perhaps you are using a rc.conf setting that creates a md /tmp.
> >
> > Indeed, here it was:
> >
> > amavisd_enable="YES"
> > amavisd_ram="512m"
> >
> > and the line in rc.d/amavisd
> > mdmfs -M -s ${amavisd_ram} -w vscan:vscan md /var/amavis/tmp || true
> > for some reason creates a malloc based mfs
> >
> > Perhaps I should check this with the maintainer...
> >
> >
>
> Yes, malloc backing for md should be used in almost no situations.
Am I right in thinking such situations would then be limited to diskless
/ flashdisk / embedded systems having no swap? Seems obvious, but ..
Cheers, Ian
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