Parameter-Read-Timeout in Wildfly 9.0.1.Final

Question

We have stumbled accross some odd (currently non-reproducable) behaviour in the JDK8_74/Wildfly 9.0.1.Final. Upon parsing the parameters of a post-request the worker thread starts an infinite-loop into the native method PollArrayWrapper.poll0(long, int, long). The thread consumes 100% CPU load on one core.

mServlet.java:468 io.undertow.servlet.spec.HttpServletRequestImpl.getParameterValues(String)
  HttpServletRequestImpl.java:679 io.undertow.servlet.spec.HttpServletRequestImpl.parseFormData()
 ...
    SelectorImpl.java:86 sun.nio.ch.PollSelectorImpl.doSelect(long)
      PollSelectorImpl.java:87 sun.nio.ch.PollArrayWrapper.poll(int, int, long)
        PollArrayWrapper.java:115 sun.nio.ch.PollArrayWrapper.poll0(long, int, long)

Has anyone seen this? It seems to pop up in different projects on different occasions since 2005 and has been reported several times as JDK Bug and those have been marked fixed.

Has anyone any idea, how to force Wildfly to use a timeout on the poll0 Method?

Kind regards, Jonathan

that means linux kernel 2.6.37 right? if not please update post with output of uname -a command. 2.6 kernel had few known issues around this. Is there any chance you could try running your code on any newer kernel? 3.x preffered, SLES 12 maybe or any other distro that uses newer kernel. JDK you are using is oracle's or openjdk? — Tomaz Cerar, Mar 23 '16 at 22:39
@ctomc Our SLES SP4 comes with kernel 3.0.101-68-default, we are running on arch amd64 and using the Oracle-JDK — Jonathan, Mar 24 '16 at 08:44

score 0 · Accepted Answer · answered Jul 15 '16 at 08:42

As ctomc implied, this issue is very likely a non-resolved jdk-bug. Our software is running on quite a vew different execution environments and we have ever seen this issue on the SLES 11.4.23 system.

A possible solution is to employ thread-encapsulation in a hystrix style: encapsulating the critical call within a Callable and therefore allowing to implement some form of watchdog/time-out.

Parameter-Read-Timeout in Wildfly 9.0.1.Final

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