Deadlock between SSLSocketImpl.close and SSLSocketImpl.getConnectionState

Issue

• We see a deadlock between SSLSocketImpl.getConnectionState and SSLSocketImpl.close:

 "Thread-16":
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.getConnectionState(SSLSocketImpl.java:601)
    - waiting to lock <0xb96944d8> (a com.sun.net.ssl.internal.ssl.SSLSocketImpl)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.isClosed(SSLSocketImpl.java:1328)
    at java.net.Socket.getTcpNoDelay(Socket.java:877)
    at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.getTcpNoDelay(BaseSSLSocketImpl.java:325)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecordInternal(SSLSocketImpl.java:770)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:753)
    at com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:100)
    - locked <0xb9694590> (a com.sun.net.ssl.internal.ssl.AppOutputStream)
    at java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:65)
    at java.io.BufferedOutputStream.flush(BufferedOutputStream.java:123)
    - locked <0xb96945a8> (a java.io.BufferedOutputStream)
    at java.io.PrintStream.flush(PrintStream.java:288)
    - locked <0xb96945c0> (a java.io.PrintStream)
    at sun.net.www.MessageHeader.print(MessageHeader.java:245)
    - locked <0xb9e03158> (a sun.net.www.MessageHeader)
    at sun.net.www.http.HttpClient.writeRequests(HttpClient.java:604)
    at sun.net.www.http.HttpClient.writeRequests(HttpClient.java:618)
    at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:576)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1216)
    - locked <0xb9e03170> (a sun.net.www.protocol.https.DelegateHttpsURLConnection)
    at sun.net.www.protocol.http.HttpURLConnection.getHeaderField(HttpURLConnection.java:2340)
    at java.net.HttpURLConnection.getHeaderFieldDate(HttpURLConnection.java:450)
    at java.net.URLConnection.getLastModified(URLConnection.java:532)
    at sun.net.www.protocol.https.HttpsURLConnectionImpl.getLastModified(HttpsURLConnectionImpl.java:398)
    ...
"Finalizer":
    at sun.misc.Unsafe.park(Native Method)
    - parking to wait for  <0xb9698c20> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
    at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842)
    at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178)
    at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186)
    at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:751)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:624)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.sendAlert(SSLSocketImpl.java:1875)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.warning(SSLSocketImpl.java:1713)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.closeInternal(SSLSocketImpl.java:1481)
    - locked <0xb96944d8> (a com.sun.net.ssl.internal.ssl.SSLSocketImpl)
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.close(SSLSocketImpl.java:1419)
    at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.finalize(BaseSSLSocketImpl.java:230)
    at java.lang.ref.Finalizer.invokeFinalizeMethod(Native Method)
    at java.lang.ref.Finalizer.runFinalizer(Finalizer.java:83)
    at java.lang.ref.Finalizer.access$100(Finalizer.java:14)
    at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:160)