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From "Isaac Cruz Ballesteros (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HTTPCORE-366) Infinite loop when using HTTPS server + NIO
Date Tue, 26 Nov 2013 16:40:35 GMT
Isaac Cruz Ballesteros created HTTPCORE-366:
-----------------------------------------------

             Summary: Infinite loop when using HTTPS server + NIO
                 Key: HTTPCORE-366
                 URL: https://issues.apache.org/jira/browse/HTTPCORE-366
             Project: HttpComponents HttpCore
          Issue Type: Bug
          Components: HttpCore NIO
    Affects Versions: 4.2.5
            Reporter: Isaac Cruz Ballesteros


This affects 4.2.5 but probably the newer versions as well.

So I'm setting a HTTPS server using NIO to receive uploads from clients. Clients are using
libcurl to upload.

I've detected that sometimes (one every 2-4 days) the java process takes 100% cpu, and it's
the "I/O dispatcher" thread which is in a infinite loop, with stack traces such as:

"I/O dispatcher 1" prio=10 tid=0x00007f3e2400b000 nid=0x11c9 runnable [0x00007f3e3995e000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.http.impl.nio.reactor.IOSessionImpl.getEventMask(IOSessionImpl.java:139)
        - locked <0x00000000e09f5a70> (a org.apache.http.impl.nio.reactor.IOSessionImpl)
        at org.apache.http.nio.reactor.ssl.SSLIOSession.updateEventMask(SSLIOSession.java:306)
        at org.apache.http.nio.reactor.ssl.SSLIOSession.inboundTransport(SSLIOSession.java:411)
        - locked <0x00000000e09f6938> (a org.apache.http.nio.reactor.ssl.SSLIOSession)
        at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:121)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.validate(BaseIOReactor.java:220)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:284)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:106)
        at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:613)
        at java.lang.Thread.run(Thread.java:662)


"I/O dispatcher 1" prio=10 tid=0x00007f01a000b000 nid=0x1f78 runnable [0x00007f01d1cf6000]
   java.lang.Thread.State: RUNNABLE
        at org.apache.http.nio.reactor.ssl.SSLIOSession.doHandshake(SSLIOSession.java:276)
        at org.apache.http.nio.reactor.ssl.SSLIOSession.isAppInputReady(SSLIOSession.java:381)
        - locked <0x00000000e08b5178> (a org.apache.http.nio.reactor.ssl.SSLIOSession)
        at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:118)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:160)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:342)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:320)
        at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:280)
        at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:106)
        at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:613)
        at java.lang.Thread.run(Thread.java:662)

The socket in the server side is in CLOSE_WAIT state, so the client closed the connection
but not the server.

I added some logs to the httpcore-nio library to try to know some details of when this issue
happens, specifically in AbstractIODispatch.inputReady() and in several places in SSLIOSession,
to print the SSLEngineResult after doWrap and doUnwrap in doHandshake() and decryptData()
method, and also in isAppInputReady() to print bytesRead, inEncrypted buffer state, and HandshakeStatus.

I'm going to explain what I found, if you want I can attach the complete generated logs.

So after handshake and some data exchange, we start receiving data from client, and we keep
getting a BUFFER_UNDERFLOW until the inEncrypted buffer is complete:

2013-11-26 02:59:37,914 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 1346,
inEncrypted: java.nio.HeapByteBuffer[pos=16665 lim=16665 cap=16665]
2013-11-26 02:59:37,915 [I/O dispatcher 1] ssl.SSLIOSession: result from unwrap: Status =
OK HandshakeStatus = NOT_HANDSHAKING
bytesConsumed = 16421 bytesProduced = 16384

We produce 16384 bytes of user data, and from here we start receiving more data:
2013-11-26 02:59:37,915 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 34, inEncrypted:
java.nio.HeapByteBuffer[pos=278 lim=16665 cap=16665]

2013-11-26 02:59:37,948 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 1380,
inEncrypted: java.nio.HeapByteBuffer[pos=1658 lim=16665 cap=16665]

2013-11-26 02:59:37,982 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 1380,
inEncrypted: java.nio.HeapByteBuffer[pos=3038 lim=16665 cap=16665]

2013-11-26 02:59:38,017 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 1380,
inEncrypted: java.nio.HeapByteBuffer[pos=4418 lim=16665 cap=16665]

2013-11-26 02:59:38,051 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 1380,
inEncrypted: java.nio.HeapByteBuffer[pos=5798 lim=16665 cap=16665]

2013-11-26 02:59:38,391 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 4140,
inEncrypted: java.nio.HeapByteBuffer[pos=9938 lim=16665 cap=16665]

2013-11-26 02:59:38,440 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 5520,
inEncrypted: java.nio.HeapByteBuffer[pos=15458 lim=16665 cap=16665]

Between all these recvs we always get a BUFFER_UNDERFLOW from unwrap()

>From that time (note that the inEncrypted buffer is still not full) we stop receiving
any data. For some reason there's a call to isAppInputReady() every second, which always do
the same: bytesRead = 0, buffer_underflow. I don't know why this is called even though this
channel hasn't been "selected" by select(), I think it comes from the validate() call in AbstractIOReactor
line 284:
                // Validate active channels
                validate(this.selector.keys());

But anyway, this isn't very important.

The point is after 30 seconds from last packet sent, the client closes connection. This is
probably a timeout, not sure, and I also don't understand why the server thinks it needs more
data to decrypt, and why the client does not send more data if that's true.... In any case,
after 30 seconds this is what happens:

2013-11-26 03:00:07,481 [I/O dispatcher 1] nio.DefaultHttpServerIODispatch: inputReady on
192.168.100.40:9443<->75.37.10.219:40186[ACTIVE][r:r]
2013-11-26 03:00:07,481 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 0, inEncrypted:
java.nio.HeapByteBuffer[pos=15458 lim=16665 cap=16665]
2013-11-26 03:00:07,481 [I/O dispatcher 1] ssl.SSLIOSession: handshake status: NOT_HANDSHAKING
2013-11-26 03:00:07,481 [I/O dispatcher 1] ssl.SSLIOSession: result from unwrap: Status =
BUFFER_UNDERFLOW HandshakeStatus = NOT_HANDSHAKING
2013-11-26 03:00:08,483 [I/O dispatcher 1] nio.DefaultHttpServerIODispatch: inputReady on
192.168.100.40:9443<->75.37.10.219:40186[ACTIVE][rw:r]
2013-11-26 03:00:08,483 [I/O dispatcher 1] ssl.SSLIOSession: bytesRead from socket: 0, inEncrypted:
java.nio.HeapByteBuffer[pos=15458 lim=16665 cap=16665]
2013-11-26 03:00:08,483 [I/O dispatcher 1] ssl.SSLIOSession: result from wrap: Status = CLOSED
HandshakeStatus = NEED_UNWRAP
bytesConsumed = 0 bytesProduced = 37
2013-11-26 03:00:08,483 [I/O dispatcher 1] ssl.SSLIOSession: handshake status: NEED_UNWRAP

>From here it starts an infinite loop: it's calling continuously the inputReady() method,
but it never closes the socket, it keeps getting status = BUFFER_UNDERFLOW when calling unwrap()
and handshake status = NEED_UNWRAP (as the client has closed SSL session)





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