ADDITIONAL SYSTEM INFORMATION :
Ubuntu 16.04.3 LTS
java version "1.8.0_172"
Java(TM) SE Runtime Environment (build 1.8.0_172-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.172-b11, mixed mode)

A DESCRIPTION OF THE PROBLEM :
With heavy load of many ssl handshakes using apache http-client, the application hangs. Here is a link to JFR snapshot https://www.dropbox.com/s/cpgx406vkqpvc80/2018-06-25_08-11-23.jfr.zip?dl=0 where

java.security.Provider.getService(String, String)
   sun.security.jca.ProviderList$ServiceList.tryGet(int)
      sun.security.jca.ProviderList$ServiceList.access$200(ProviderList$ServiceList, int)
         sun.security.jca.ProviderList$ServiceList$1.hasNext()

average call is 5.5 sec.

Stack Trace Count Duration
java.security.Provider.getService(String, String) 34,119 167,513,413,751,896
   sun.security.jca.ProviderList$ServiceList.tryGet(int) 17,642 87,721,088,998,037
      sun.security.jca.ProviderList$ServiceList.access$200(ProviderList$ServiceList, int) 17,642 87,721,088,998,037
         sun.security.jca.ProviderList$ServiceList$1.hasNext() 17,642 87,721,088,998,037
            javax.crypto.KeyGenerator.nextSpi(KeyGeneratorSpi, boolean) 6,009 29,975,333,754,681
               javax.crypto.KeyGenerator.<init>(String) 6,009 29,975,333,754,681
                  javax.crypto.KeyGenerator.getInstance(String) 6,009 29,975,333,754,681
                     sun.security.ssl.JsseJce.getKeyGenerator(String) 6,009 29,975,333,754,681
                        sun.security.ssl.HandshakeMessage$Finished.getFinished(HandshakeHash, int, SecretKey)
sun.security.ssl.HandshakeMessage$Finished.<init>(ProtocolVersion, HandshakeHash, int, SecretKey, CipherSuite) 1,582 7,560,092,837,932
sun.security.ssl.ClientHandshaker.sendChangeCipherAndFinish(boolean) 1,061
sun.security.ssl.ClientHandshaker.serverHelloDone(HandshakeMessage$ServerHelloDone)
sun.security.ssl.ClientHandshaker.processMessage(byte, int)
sun.security.ssl.Handshaker.processLoop()
sun.security.ssl.Handshaker.process_record(InputRecord, boolean)
sun.security.ssl.SSLSocketImpl.readRecord(InputRecord, boolean)
sun.security.ssl.SSLSocketImpl.performInitialHandshake()
sun.security.ssl.SSLSocketImpl.startHandshake(boolean)
sun.security.ssl.SSLSocketImpl.startHandshake() org.apache.http.conn.ssl.SSLConnectionSocketFactory.createLayeredSocket(Socket, String, int, HttpContext)



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
each time after 3 days of application work.


CUSTOMER SUBMITTED WORKAROUND :
restart application.

FREQUENCY : always