SNMP Process hangs on Cisco Nexus SwitchThe SNMP process will stop responding on Nexus 5010 NXOS version 5.0(3)N2(1)
It appears upgrading to latest version is supposed to fix it.
Or a workaround is to unload the BRIDGE-MIB with the following command from config mode:
no snmp-server load-mib dot1dbridgesnmp
(this will not persist after a reload.)