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Date: Fri, 23 May 2008 19:17:48 +0200 (CEST)
From: Stefan `Sec` Zehl <sec@42.org>
Reply-To: Stefan `Sec` Zehl <sec@42.org>
To: FreeBSD-gnats-submit@freebsd.org
Cc:
Subject: Swap problem?
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>Number:         123936
>Category:       amd64
>Synopsis:       Swap problem?
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-amd64
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri May 23 17:20:00 UTC 2008
>Closed-Date:    Fri May 23 22:59:42 UTC 2008
>Last-Modified:  Fri May 23 23:00:02 UTC 2008
>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@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?

>How-To-Repeat:
	
>Fix:

>Release-Note:
>Audit-Trail:
State-Changed-From-To: open->closed 
State-Changed-By: kris 
State-Changed-When: Fri May 23 22:59:21 UTC 2008 
State-Changed-Why:  
Submitter needs to add more swap or reduce the demand for it. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=123936 

From: Kris Kennaway <kris@FreeBSD.org>
To: Stefan `Sec` Zehl <sec@42.org>
Cc: FreeBSD-gnats-submit@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@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
>Unformatted:
