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Date: Mon, 18 Oct 2004 16:36:37 +0400 (MSD)
From: Igor Sysoev <is@rambler-co.ru>
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To: Robert Watson <rwatson@freebsd.org>
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cc: Steve Shorter <steve@nomad.tor.lets.net>
Subject: Re: vnode_pager_putpages errors and DOS?
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On Sat, 9 Oct 2004, Robert Watson wrote:

> On Fri, 8 Oct 2004, Steve Shorter wrote:
>
> > > 	I have some machines that run customers cgi stuff.
> > > These machines have started to hang and become unresponsive.
> > > At first I thought it was a hardware issue, but I discovered in
> > > a cyclades log the following stuff that got logged to the
> > > console which explains the cause of the system hangs/failures.
> > >
> > > vnode_pager_putpages: residual I/O 65536 at 347
> > > vnode_pager_putpages: I/O error 28]
> > > vnode_pager_putpages: residual I/O 65536 at 285]
> >
> > 	Aha! also at the same time I get in syslog
> >
> > 	/kernel: pid 6 (syncer), uid 0 on /chroot/tmp: file system full
> >
> > 	Whats happening? Can a full filesystem bring the thing down?
> > Ideas? Fixes?
>
> Ideally not, but many UNIX programs respond poorly to being out of memory
> and disk space ("No space, wot?").  Are you using a swap file, and if so,
> how did you create the swapfile?  Are you using sparse files much?

If the machines run CGIs, then it is probably ImageMagick's mmap()s:
http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/67919


Igor Sysoev
http://sysoev.ru/en/