Thread stuck on socket read - how to diagnose?

As per the thread dumps, there are multiple threads that are stuck in the following methods.

Can you please help with how to diagnose the root cause of the issue here?

Oracle JDBC call (via c3p0 connection pool):

stackTrace:
java.lang.Thread.State: RUNNABLE
at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
at sun.nio.ch.IOUtil.read(IOUtil.java:197)
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:380)
- locked <0x00007f2b2c3f0098> (a java.lang.Object)
at oracle.net.nt.TimeoutSocketChannel.read(TimeoutSocketChannel.java:174)
at oracle.net.ns.NSProtocolNIO.doSocketRead(NSProtocolNIO.java:555)
at oracle.net.ns.NIOPacket.readNIOPacket(NIOPacket.java:403)
at oracle.net.ns.NSProtocolNIO.negotiateConnection(NSProtocolNIO.java:127)
at oracle.net.ns.NSProtocol.connect(NSProtocol.java:340)
at oracle.jdbc.driver.T4CConnection.connect(T4CConnection.java:1596)
at oracle.jdbc.driver.T4CConnection.logon(T4CConnection.java:588)
at oracle.jdbc.driver.PhysicalConnection.connect(PhysicalConnection.java:793)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:57)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:747)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:562)
at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:175)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:220)
at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:206)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:203)

RMI TCP Connection (our application uses RMI protocol):

stackTrace:
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
at java.net.SocketInputStream.read(SocketInputStream.java:171)
at java.net.SocketInputStream.read(SocketInputStream.java:141)
at java.io.BufferedInputStream.fill(BufferedInputStream.java:246)
at java.io.BufferedInputStream.read(BufferedInputStream.java:265)
- locked <0x00007f2b2c36ff68> (a java.io.BufferedInputStream)
at java.io.FilterInputStream.read(FilterInputStream.java:83)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:555)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:834)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$565/1654260980.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Locked ownable synchronizers:

Report URL - https://fastthread.io/my-thread-report.jsp?p=c2hhcmVkLzIwMjEvMDMvMTUvLS1LTl9UaHJlYWRfRHVtcF8yMDIxLTAzLTE1XzE3XzQzLmxvZy0tMTktNC0xNTs7LS1LTl9UaHJlYWRfRHVtcF8yMDIxLTAzLTE1XzE3XzQzLmxvZy0tMTktNC0xNQ==