Hi Raja,
i had the same problem. I patched the SAPhostagent to patchno 441. You can download the SAPhostagent from the place you get the 7.20 kernel.
root> /usr/sap/hostctrl/exe/saphostexec -stop
check if saposcol running, if yes (s.th. is wrong, kill it the hard way) kill -9 <pid of saposcol>
root> /sapmnt/SID/exe/cleanipc 99 remove
root> mkdir /tmp/sap
root> cd /tmp/sap
root> /sapmnt/SID/exe/SAPCAR -xfv <path to SAR-file>/SAPHOSTAGENT160_160-20005726.SAR
root> ./saphostexec -upgrade
Hope it helps
Best regards
Willi Eimler