Sporadic frequent IllegalReferenceCountException

This is yet another kind of sporadic exception that we encounter regularly when running our analytics pre-commit tests.

com.couchbase.client.core.RequestCancelledException: Error while encoding Request, cancelling. com.couchbase.client.core.RequestCancelledException: Error while encoding Request, cancelling. at com.couchbase.client.core.endpoint.AbstractGenericHandler.encode(AbstractGenericHandler.java:255) at com.couchbase.client.core.endpoint.AbstractGenericHandler.encode(AbstractGenericHandler.java:74) at com.couchbase.client.deps.io.netty.handler.codec.MessageToMessageCodec$1.encode(MessageToMessageCodec.java:67) at com.couchbase.client.deps.io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:88) at com.couchbase.client.deps.io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116) at com.couchbase.client.core.endpoint.AbstractGenericHandler.write(AbstractGenericHandler.java:242) at com.couchbase.client.deps.io.netty.channel.AbstractChannelHandlerContext.invokeWrite0(AbstractChannelHandlerContext.java:732) at com.couchbase.client.deps.io.netty.channel.AbstractChannelHandlerContext.invokeWrite(AbstractChannelHandlerContext.java:724) at com.couchbase.client.deps.io.netty.channel.AbstractChannelHandlerContext.access$1900(AbstractChannelHandlerContext.java:35) at com.couchbase.client.deps.io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.write(AbstractChannelHandlerContext.java:1061) at com.couchbase.client.deps.io.netty.channel.AbstractChannelHandlerContext$AbstractWriteTask.run(AbstractChannelHandlerContext.java:1050) at com.couchbase.client.deps.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:399) at com.couchbase.client.deps.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:464) at com.couchbase.client.deps.io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:131) at com.couchbase.client.deps.io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:138) at java.lang.Thread.run(Thread.java:748) Caused by: com.couchbase.client.deps.io.netty.util.IllegalReferenceCountException: refCnt: 0, increment: 1 at com.couchbase.client.deps.io.netty.buffer.AbstractReferenceCountedByteBuf.retain0(AbstractReferenceCountedByteBuf.java:68) at com.couchbase.client.deps.io.netty.buffer.AbstractReferenceCountedByteBuf.retain(AbstractReferenceCountedByteBuf.java:53) at com.couchbase.client.deps.io.netty.buffer.AbstractDerivedByteBuf.retain(AbstractDerivedByteBuf.java:41) at com.couchbase.client.core.endpoint.kv.KeyValueHandler.encodeRequest(KeyValueHandler.java:245) at com.couchbase.client.core.endpoint.kv.KeyValueHandler.encodeRequest(KeyValueHandler.java:126) at com.couchbase.client.core.endpoint.AbstractGenericHandler.encode(AbstractGenericHandler.java:253) ... 15 more ...Unexpected!