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Why does xfsdump encounter "WARNING: could not get list of non-root attr

To: linux-xfs@xxxxxxxxxxx
Subject: Why does xfsdump encounter "WARNING: could not get list of non-root attributes for nondir ino nnnn: Cannot allocate memory (12)"?
From: Michael Lueck <mlueck@xxxxxxxxxxxxxxxxxxxx>
Date: Sat, 31 Dec 2011 16:50:27 -0500
Organization: Lueck Data Systems
Reply-to: mlueck@xxxxxxxxxxxxxxxxxxxx
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:9.0.1) Gecko/20111221 Firefox/9.0.1 SeaMonkey/2.6.1
Greetings,

Happy old year! ;-)

Running XFS on Ununtu 10.04 LTS, I have noticed more warnings with XFS dump the longer the system has been up. A reboot cuts down on the number of warnings xfsdump encounters. An example run of xfsdump is as follows:

/usr/sbin/xfsdump: using file dump (drive_simple) strategy
/usr/sbin/xfsdump: version 3.0.4 (dump format 3.0) - Running single-threaded
/usr/sbin/xfsdump: level 0 dump of ldslnx01:/srv
/usr/sbin/xfsdump: dump date: Sat Dec 31 15:25:42 2011
/usr/sbin/xfsdump: session id: b56b3cd7-30d6-44b4-a8a4-e131ee70b60d
/usr/sbin/xfsdump: session label: "data"
/usr/sbin/xfsdump: ino map phase 1: constructing initial dump list
/usr/sbin/xfsdump: ino map phase 2: skipping (no pruning necessary)
/usr/sbin/xfsdump: ino map phase 3: skipping (only one dump stream)
/usr/sbin/xfsdump: ino map construction complete
/usr/sbin/xfsdump: estimated dump size: 115786343168 bytes
/usr/sbin/xfsdump: WARNING: no media label specified
/usr/sbin/xfsdump: creating dump session media file 0 (media 0, file 0)
/usr/sbin/xfsdump: dumping ino map
/usr/sbin/xfsdump: dumping directories
/usr/sbin/xfsdump: dumping non-directory files
/usr/sbin/xfsdump: WARNING: could not get list of non-root attributes for 
nondir ino 234778: Cannot allocate memory (12)
/usr/sbin/xfsdump: WARNING: could not get list of non-root attributes for 
nondir ino 234813: Cannot allocate memory (12)
/usr/sbin/xfsdump: WARNING: could not get list of non-root attributes for 
nondir ino 1828443: Cannot allocate memory (12)
/usr/sbin/xfsdump: WARNING: could not get list of root attributes for nondir 
ino 1828443: Cannot allocate memory (12)
/usr/sbin/xfsdump: WARNING: could not get list of non-root attributes for 
nondir ino 2234019: Cannot allocate memory (12)
/usr/sbin/xfsdump: ending media file
/usr/sbin/xfsdump: media file size 115563111376 bytes
/usr/sbin/xfsdump: dump size (non-dir files) : 115472209824 bytes
/usr/sbin/xfsdump: dump complete: 4099 seconds elapsed
/usr/sbin/xfsdump: Dump Status: SUCCESS

Could someone please explain what is going on, and why a freshly rebooted 
system would result in less / no errors?

Sincerely,

--
Michael Lueck
Lueck Data Systems
http://www.lueckdatasystems.com/

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