node-smpp: Possible Memory Leak

Hi, I was wondering if someone from the team could offer dedicated support against a fee to resolve an issue we’re facing. The app seems to reach 100% CPU and clients are disconnected after that. This usually happens with high traffic of SMS. CPU profiling data points mostly towards Session._extractPDUs We have removed any blocking code but still the problem persists. The code snippet is as follows:

   let server = smpp.createServer((session) => {
		//get session info
		let system_id, bindid;
		let userData = {
			smppData: null,
			userPermInfo: null,
			routeData: null
		};
		let processBind = {}; //this object stays within this core 
		let sharedBind = {}; // this object is shared among all processes
		session.on('bind_transceiver', (pdu) => {
			//authorize the session
			log(`TRx PDU Received on ${process.env.WorkerName}:`, pdu);
			session.pause();
			system_id = pdu.system_id;
			bindid = Math.random().toString(36).substring(3);
			
			smppAuth(pdu.system_id, pdu.password, async (err, userSmppdata) => {
				if (err || userSmppdata==undefined) {
					session.send(pdu.response({
						command_status: smpp.ESME_RBINDFAIL
					}));
					session.destroy();
					log(`BIND FAILED: Invalid Credentials`);
					return;
				}

				userData.smppData = userSmppdata;
				
				//get user permissions and routedata for this bind
				let [userPermInfo, routeData] = await Promise.all([ getUserPermissions(userSmppdata.user_id), getRouteDetails(userSmppdata.route_id) ]) ;
				userData.userPermInfo = userPermInfo;
				userData.routeData = routeData;
				userPermInfo = routeData = null;
				session.send(pdu.response());
				session.resume();
				log(`TRx BIND EXTABLISHED from ${client_ip}: Waiting for incoming PDU on ${process.env.WorkerName}..`);
				
				//---
				processBind = sharedBind = null;
				
			});
		});

		session.on('submit_sm', (pdu) => {
			let sequence_number = pdu.sequence_number;
			let msgid = uuidv1(); //vendor msg id
			//-- start async processessing of PDU
			let userobj = userData;
			
				asyncProcessPdu(pdu, userobj).then( res => {
					if(res.status=='error'){
						session.deliver_sm(res.options);
						log('Some Error occurred: Response PDU sent..');
					}
				});
			
			session.send(pdu.response({
				message_id: msgid,
				sequence_number: sequence_number
			}));
			log(msgid);
		});

		session.on('unbind', (pdu) => {
			session.send(pdu.response());
			log(`SESSION DISCONNECTED`);
			session.destroy();
		});
		
		session.on('enquire_link', (pdu) => {
				session.send(pdu.response());
		});

		session.on('deliver_sm_resp', (pdu) => {
			let result = someTask(pdu.sequence_number, pdu);
			result.then(()=>{
				log('Delivery Acknowledgement saved in Database . . .');
			})
			
		});


	});
	server.listen(2775);

Anything looks suspicious here? I’m open to suggestions. -Thanks in advance