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Date: Wed, 14 Sep 2005 16:13:54 -0700
From: John-Mark Gurney <gurney_j@resnet.uoregon.edu>
To: Kris Kennaway <kris@obsecurity.org>
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	Ivan Voras <ivoras@fer.hr>, stable@freebsd.org
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Cc: stable@freebsd.org, Ivan Voras <ivoras@fer.hr>
Subject: Re: ENOMEM in swap_pager
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Kris Kennaway wrote this message on Wed, Sep 14, 2005 at 15:25 -0400:
> On Wed, Sep 14, 2005 at 09:20:48PM +0200, Ivan Voras wrote:
> > On a P3 server with 1GB of memory, every now and then (about twice a 
> > month) I get a log full of errors like this:
> > 
> > swap_pager: I/O error - pageout failed; blkno 167,size 4096, error 12
								       ^^
> > swap_pager: I/O error - pageout failed; blkno 182,size 4096, error 12
> > swap_pager: I/O error - pageout failed; blkno 199,size 8192, error 12
> > swap_pager: I/O error - pageout failed; blkno 12456,size 20480, error 12
> > swap_pager: I/O error - pageout failed; blkno 222,size 8192, error 12
> > 
> > The server runs fine otherwise, and it doesn't seem to affect applications 
> > in any way I'm able to detect. It's running latest 5.4-RELEASE, swap is 
> > on a SCSI disk, single processor.
> > 
> > IIRC GEOM should handle ENOMEMs by retrying the IO, but I'm asking just in 
> > case - are these errors something I should worry about?
> 
> I/O errors suggest your disk is failing.

Unless for some reason his disk is running out of memory:
grep 12 /usr/include/errno.h
#define	ENOMEM		12		/* Cannot allocate memory */

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."