Issue

• We have problems with JBoss, because on several occasions a week, CPU consumption goes up making Http services unnacessible.

Found one Java-level deadlock:

"default task-28":
  waiting to lock monitor 0x000000000daeca28 (object 0x000000074bea12d0, a io.undertow.protocols.http2.Http2Channel),
  which is held by "default I/O-3"
"default I/O-3":
  waiting to lock monitor 0x000000000b2c50e8 (object 0x000000074bfeeb20, a java.lang.Object),
  which is held by "default task-28"

Java stack information for the threads listed above:

"default task-28":
    at io.undertow.server.protocol.framed.AbstractFramedChannel.notifyClosed(AbstractFramedChannel.java:904)
    - waiting to lock <0x000000074bea12d0> (a io.undertow.protocols.http2.Http2Channel)
    at io.undertow.server.protocol.framed.AbstractFramedStreamSourceChannel.exitRead(AbstractFramedStreamSourceChannel.java:584)
    - locked <0x000000074bfeeb20> (a java.lang.Object)
    at io.undertow.server.protocol.framed.AbstractFramedStreamSourceChannel.read(AbstractFramedStreamSourceChannel.java:531)
    at io.undertow.protocols.http2.Http2StreamSourceChannel.read(Http2StreamSourceChannel.java:141)
    at org.xnio.conduits.StreamSourceChannelWrappingConduit.read(StreamSourceChannelWrappingConduit.java:43)
    at org.xnio.conduits.ConduitStreamSourceChannel.read(ConduitStreamSourceChannel.java:127)
    at io.undertow.channels.DetachableStreamSourceChannel.read(DetachableStreamSourceChannel.java:209)
    at io.undertow.server.HttpServerExchange$ReadDispatchChannel.read(HttpServerExchange.java:2301)
    at io.undertow.servlet.spec.ServletInputStreamImpl.readIntoBufferNonBlocking(ServletInputStreamImpl.java:198)
    at io.undertow.servlet.spec.ServletInputStreamImpl.available(ServletInputStreamImpl.java:231)
    at java.io.FilterInputStream.available(FilterInputStream.java:168)
    at java.io.PushbackInputStream.available(PushbackInputStream.java:277)
    at sun.nio.cs.StreamDecoder.inReady(StreamDecoder.java:363)
    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:324)
    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
    - locked <0x000000074c195ba8> (a java.io.InputStreamReader)
        ...

"default I/O-3":
    at io.undertow.server.protocol.framed.AbstractFramedStreamSourceChannel.markStreamBroken(AbstractFramedStreamSourceChannel.java:657)
    - waiting to lock <0x000000074bfeeb20> (a java.lang.Object)
    at io.undertow.protocols.http2.AbstractHttp2StreamSourceChannel.markStreamBroken(AbstractHttp2StreamSourceChannel.java:68)
    at io.undertow.server.protocol.framed.AbstractFramedChannel.markReadsBroken(AbstractFramedChannel.java:823)
    at io.undertow.server.protocol.framed.AbstractFramedChannel.receive(AbstractFramedChannel.java:474)
    - locked <0x000000074bea12d0> (a io.undertow.protocols.http2.Http2Channel)
        ...