amd64/123936: Swap problem?

[Kris Kennaway]

The following reply was made to PR amd64/123936; it has been noted by GNATS.

From: Kris Kennaway <kris at FreeBSD.org>
To: Stefan `Sec` Zehl <sec at 42.org>
Cc: FreeBSD-gnats-submit at FreeBSD.org
Subject: Re: amd64/123936: Swap problem?
Date: Fri, 23 May 2008 22:59:14 +0000

 On Fri, May 23, 2008 at 07:17:48PM +0200, Stefan `Sec` Zehl wrote:
 > 
 > >Number:         123936
 > >Category:       amd64
 > >Synopsis:       Swap problem?
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       low
 > >Responsible:    freebsd-amd64
 > >State:          open
 > >Quarter:        
 > >Keywords:       
 > >Date-Required:
 > >Class:          sw-bug
 > >Submitter-Id:   current-users
 > >Arrival-Date:   Fri May 23 17:20:00 UTC 2008
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Stefan `Sec` Zehl
 > >Release:        FreeBSD 7.0-STABLE amd64
 > >Organization:
 > >Environment:
 > System: FreeBSD ice 7.0-STABLE FreeBSD 7.0-STABLE #13: Thu May 8 15:00:23 CEST 2008 root at ice:/usr/obj/usr/src/sys/ICE amd64
 > 
 > 
 > 	
 > >Description:
 > 
 > My FreeBSD-7.0-STABLE amd64 machine had some strange swap problems today.
 > 
 > /var/log/messages shows these messages:
 > 
 > | May 23 10:59:07 ice kernel: swap_pager_getswapspace(16): failed
 > | May 23 10:59:07 ice kernel: swap_pager_getswapspace(8): failed
 > | May 23 10:59:07 ice kernel: swap_pager_getswapspace(16): failed
 > | May 23 10:59:07 ice kernel: swap_pager_getswapspace(12): failed
 > | May 23 10:59:07 ice kernel: swap_pager_getswapspace(16): failed
 > | May 23 10:59:07 ice kernel: swap_pager_getswapspace(12): failed
 > | May 23 10:59:07 ice kernel: swap_pager_getswapspace(16): failed
 > | [....]
 > until two processes were killed
 > 
 > | May 23 10:59:11 ice kernel: pid 52947 (named), uid 53, was killed: out of swap s
 > 
 > After that, these messages stopped.
 > 
 > The disk itself appears to be ok -- smartctl lists no problems(did also run a
 > smartctl -t short run), and a dd can read the entire swap device without
 > problems.
 > 
 > I have encrypted my swap by having the following line in my /etc/fstab:
 > |/dev/ad4s1b.eli         none            swap    sw              0       0
 > 
 > swapinfo confirms this:
 > | Device          1K-blocks     Used    Avail Capacity
 > | /dev/ad4s1b.eli   1441088   188852  1252236    13%
 > 
 > Is there any known issue with encrypted swap? And do the numbers in
 > "getspace(xx)" signify anyting? Is there any additional information needed?
 
 This is not a bug.  Your system ran out of free swap, reported the
 failure to allocate more of it, then killed off one of the processes
 that was hogging it.
 
 Kris