You are probably running into CSCdv82740.
Please have a look into the bug tool kit to the
description of the problem :
To Avoid ChangeAudit CPU HOG.
Please do the following.
1. The ChangeAudit process will start collecting
the config from devices if it receives syslog
messages, notifying changes in config. The number
of such syslog messages may he high and frequently
coming in, so the ChangeAudit will be busy
collecting config, If this is the case, uncheck the
option "Listen to Syslog messages" it appears under
--)ChangeProbeSetup and see the results.
2. Check the schedule of "ConfigRetrieval" process
and "SNMP Poller" processes ( RME--)Adm--)
ChangeProbeSetup), if these processes are running
very frequently then schedule it to run once in week
or so . This may reduce CPU HOGS.
3. When config's for the devices are fetched, if we
do not give correct credentials, config collection
wouldn't have happened, so every time you restart
the ChangeAudit process it will try to fetch config's
for the devices.
Verify the device credentials using Admn--)
and give the correct credentials for devices which have wrong values entered for it.