xfsdump -- not enough memory to dump attributes? w/>20G free -- how much does it need?

[Linda A. Walsh]

I've seen the problem in the dump below and was wondering what could 
possibly cause this -- because
shows loads of free memory (>20G)...  how much memory do non-root 
attributes take to dump?


 
Dump fsname home, Mountpoint /home, Dumplevel=0
Notice: "-e" used in Xfsdump_options to allow exclusions
xfsdump -b 1m -l 0 -L home -e - /home | ( su -f -m backup -c " umask 
027;nice -19 ionice -c3 lzop > home/home-100522-0-0349.dump.lzo  " )
xfsdump: using file dump (drive_simple) strategy
xfsdump: version 3.0.1 (dump format 3.0) - Running single-threaded
xfsdump: level 0 dump of Ishtar:/home
xfsdump: dump date: Sat May 22 03:49:45 2010
xfsdump: session id: 5132d03a-d58f-4899-8a3c-a2dc86efe915
xfsdump: session label: "home"
xfsdump: ino map phase 1: constructing initial dump list
xfsdump: ino map phase 2: skipping (no pruning necessary)
xfsdump: ino map phase 3: skipping (only one dump stream)
xfsdump: ino map construction complete
xfsdump: estimated dump size: 537916877696 bytes
xfsdump: creating dump session media file 0 (media 0, file 0)
xfsdump: dumping ino map
xfsdump: dumping directories
xfsdump: dumping non-directory files
xfsdump: WARNING: could not get list of non-root attributes for nondir 
ino 75466: Cannot allocate memory (12)
xfsdump: WARNING: could not get list of non-root attributes for nondir 
ino 75468: Cannot allocate memory (12)
xfsdump: WARNING: could not get list of root attributes for nondir ino 
75468: Cannot allocate memory (12)
xfsdump: WARNING: could not get list of non-root attributes for nondir 
ino 75470: Cannot allocate memory (12)
xfsdump: WARNING: could not get list of root attributes for nondir ino 
75470: Cannot allocate memory (12)
xfsdump: WARNING: could not get list of non-root attributes for nondir 
ino 75497: Cannot allocate memory (12)

kernel = 2.6.34-Vanilla
xfsdump from package numberd 3.0.1-2.1
(x86_64)