Symptom:
on 2.5 SCH image, below cpuhog observed on RP:

Apr 16 21:57:23.987 CST: %SYS-3-CPUHOG: Task is running for (2004)msecs, more than (2000)msecs (42/40),process = SNMP ENGINE.
-Traceback= 40775270 41B61BDC 413ED1A4 413E6648 417355E4 4170AE20 416F95D0 41725D90 40C6DAC8 40C6DAB4 
Apr 16 21:57:26.003 CST: %SYS-3-CPUHOG: Task is running for (4004)msecs, more than (2000)msecs (45/40),process = SNMP ENGINE.
-Traceback= 40775244 41B61BDC 413ED1A4 413E6648 417355E4 4170AE20 416F95D0 41725D90 40C6DAC8 40C6DAB4 
Apr 16 21:57:26.895 CST: %SNMP-3-CPUHOG: Processing GetNext of docsQos3UpChCounterExtEntry.2.19724
Apr 16 21:58:19.707 CST: %HCCP-5-LC_ACTIVE: HCCP card 6/0 Mbr 60 Working: change state to active due to: CLI Switch.
Apr 16 21:58:19.735 CST: %HCCP-5-LC_STANDBY: HCCP card 5/1 Mbr 60 Protect: change state to standby due to: CLI Switch.
Apr 16 21:58:19.787 CST: %HCCP-5-CHANON: HCCP card 6/0 Mbr 60 Working: turning on channel.

Conditions:
version: ubr10k4-k9p6u2-mz.122-33.2.5.SCH 
reproduce step:
1 make more than 8k CMs w-online.
2 using SNMP tool continue polling all MIB table from SNMP server.
   command such like: "bash-3.00$getmany -v2c 20.5.10.11 private 1"
3 do LC switchover
4 using SNMP tool continue polling.
5 This issue will happen.