>do you have the x2goserver-xsession package (not sure if it is package separately for RHEL6...) installed?
no, but offhand i would guess it's not packaged separately, the following commands are among the installed commands:
x2golistsessions x2golistsessions_root x2goresume-session x2gosuspend-session x2goterminate-session x2goumount-session x2gosessionlimit x2gocleansessions
> o launch a single application (xterm), disable audio, printing, folder sharing
same result, the server cpu is pinned,
/usr/bin/x2gostartagent never returns, it's repeatedly calling /usr/libexec/x2go/x2goinsertsession, which is calling /usr/libexec/x2go/x2gosqlitewrapper.pl