Hi,

Openshift Origin uses Hawkular Metrics to store node and container data. In this scenario, Hawkular Metrics calls the Kubernetes master server over HTTPS to validate the client identity. This is implemented with Undertow Client, as part of a ServletExtension (inside Wildfly 10) [1]. Works fine in development and testing.

Now the Openshit team sees errors in the logs [2][3]. I couldn't reproduce yet. Errors come in pair, first the "UT005001: An exception occurred processing the request: java.lang.IllegalStateException: XNIO000017: Buffer was already freed", and just after "XNIO001007: A channel event listener threw an exception: java.lang.NullPointerException".

Does that ring a bell? I haven't been able to find a starting point  by looking into the source the code.

Thanks

--

Thomas Segismont

JBoss ON Engineering Team

[1] https://git.io/vrNyP

[2] https://issues.jboss.org/browse/HWKMETRICS-408

[3] https://issues.jboss.org/secure/attachment/12405779/hawkular.log

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