[jcifs] More and more transport threads in blocking state

[Stefan Neis]

Hello Mike,

disabling DFS makes no difference. If I use the setting with
responseTimeout > connTimeout the threads do not block themselves
anymore, but then I got another anomaly.

The first call of exists() returns after a delay with the result of an
exception like before and the transport thread terminates.

jcifs.smb.SmbException: Failed to connect: 0.0.0.0<00>/192.168.100.77
jcifs.util.transport.TransportException
java.net.SocketTimeoutException: connect timed out
	at java.net.DualStackPlainSocketImpl.waitForConnect(Native
Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(Unknown
Source)
	at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
	at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown
Source)
	at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
	at java.net.PlainSocketImpl.connect(Unknown Source)
	at java.net.SocksSocketImpl.connect(Unknown Source)
	at java.net.Socket.connect(Unknown Source)
	at jcifs.smb.SmbTransport.negotiate(SmbTransport.java:264)
	at jcifs.smb.SmbTransport.doConnect(SmbTransport.java:319)
	at jcifs.util.transport.Transport.run(Transport.java:241)
	at java.lang.Thread.run(Unknown Source)

	at jcifs.util.transport.Transport.run(Transport.java:258)
	at java.lang.Thread.run(Unknown Source)

But the second call in the loop throws a slightly different exception
and returns immediately without delay and with no transport thread
created.

jcifs.smb.SmbException: Failed to connect: 0.0.0.0<00>/192.168.100.77
jcifs.util.transport.TransportException: Connection in error
jcifs.util.transport.TransportException
java.net.SocketTimeoutException: connect timed out
	at java.net.DualStackPlainSocketImpl.waitForConnect(Native
Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(Unknown
Source)
	at java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
	at java.net.AbstractPlainSocketImpl.connectToAddress(Unknown
Source)
	at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
	at java.net.PlainSocketImpl.connect(Unknown Source)
	at java.net.SocksSocketImpl.connect(Unknown Source)
	at java.net.Socket.connect(Unknown Source)
	at jcifs.smb.SmbTransport.negotiate(SmbTransport.java:264)
	at jcifs.smb.SmbTransport.doConnect(SmbTransport.java:319)
	at jcifs.util.transport.Transport.run(Transport.java:241)
	at java.lang.Thread.run(Unknown Source)

	at jcifs.util.transport.Transport.run(Transport.java:258)
	at java.lang.Thread.run(Unknown Source)

	at jcifs.util.transport.Transport.connect(Transport.java:154)
	at jcifs.smb.SmbTransport.connect(SmbTransport.java:307)
	at jcifs.smb.SmbTree.treeConnect(SmbTree.java:156)
	at jcifs.smb.SmbFile.doConnect(SmbFile.java:911)
	at jcifs.smb.SmbFile.connect(SmbFile.java:954)
	at jcifs.smb.SmbFile.connect0(SmbFile.java:880)
	at jcifs.smb.SmbFile.exists(SmbFile.java:1415)
	...

The third call behaves like the first and the fourth like the second and
so on.

Stefan