[Samba] winbindd cause system hang

[Superbiji]

Hi All,

my os (Centos 4.3) connects to Windows directory using winbind
everything works fine:

ls -alh shows remote username and group
getent passwd shows remote usernames

until I run :
getfacl -R /home/samba
to backup whole acl

after 1 minutes the system hang (typing w, ls, top with no response)
but I can kill winbind and start it again, evrything back to normal

Please help