[jboss-jira] [JBoss JIRA] Created: (JBAS-8580) JBoss 6 uses 100% CPU after scanning

[Nick Newman (JIRA)]

JBoss 6 uses 100% CPU after scanning
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                 Key: JBAS-8580
                 URL: https://jira.jboss.org/browse/JBAS-8580
             Project: JBoss Application Server
          Issue Type: Bug
      Security Level: Public (Everyone can see)
    Affects Versions: 6.0.0.M2
         Environment: Seen in several environments, by myself and others (see the forum thread).  My two environments are:
JBoss 6.0.0.M2:  Java version: 1.6.0_16,Sun Microsystems Inc.   OS-System: Linux 2.6.9-89.0.26.ELsmp,i386
JBoss 6.0.0.M2:  Java version: 1.6.0_20,Sun Microsystems Inc.   OS-System: Linux 2.6.18-194.17.1.el5,i386
            Reporter: Nick Newman


These JBossAS instances are not clustered and are in environments where they are port-scanned by Nessus software looking for security problems.  After the scans each JBossAS instance is left in a state that has a thread actively consuming CPU.  A typical figure is 105% CPU on a 4-CPU box, 99.9% CPU on a single CPU virtual machine.

The JBossAS instance continues to respond despite this, although the response (and the response of everything else) is very slow on a single CPU box.

The JBossAS instances have to be restarted to resolve the problem.

The forum thread contains access logs (to show what the scanner is trying) and thread dumps from myself and others, including thread dumps at consecutive intervals to help indicate the thread activity during this unusual state.

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