UnifiedClassLoader gets stuck

N

nina

We are getting a 100% CPU usage when we run a thridparty security
scanner. The CPU usage of the application server keeps growing and gets
pegged at 100%. This is observed only in hyperthreaded machines.
Several thread dumps show two threads stuck at the same place. The CPU
remains pegged at 100% even after stopping the security scan. We don't
see the following stack traces if don't run the security scanner. Any
help would be greatly appreciated.

"Thread-477" daemon prio=1 tid=0x08a80e30 nid=0x364a runnable
[89aca000..89aca87c]
at java.util.HashMap.put(HashMap.java:382)
at java.util.HashSet.add(HashSet.java:192)
at
org.jboss.mx.loading.UnifiedClassLoader.getResourceLocally(UnifiedClassLoader.java:311)
at
org.jboss.mx.loading.UnifiedLoaderRepository3.getResourceFromRepository(UnifiedLoaderRepository3.java:419)
at
org.jboss.mx.loading.UnifiedLoaderRepository3.getResource(UnifiedLoaderRepository3.java:284)
at
org.jboss.mx.loading.UnifiedClassLoader3.getResource(UnifiedClassLoader3.java:223)
at org.jboss.web.WebServer.run(WebServer.java:343)
at org.jboss.web.ThreadPool$Worker.run(ThreadPool.java:163)



"Thread-473" daemon prio=1 tid=0x08a7fb78 nid=0x364a runnable
[89dd0000..89dd087c]
at java.util.HashMap.containsKey(HashMap.java:345)
at java.util.HashSet.contains(HashSet.java:180)
at
org.jboss.mx.loading.UnifiedClassLoader.getResourceLocally(UnifiedClassLoader.java:307)
at
org.jboss.mx.loading.UnifiedLoaderRepository3.getResourceFromRepository(UnifiedLoaderRepository3.java:419)
at
org.jboss.mx.loading.UnifiedLoaderRepository3.getResource(UnifiedLoaderRepository3.java:284)
at
org.jboss.mx.loading.UnifiedClassLoader3.getResource(UnifiedClassLoader3.java:223)
at org.jboss.web.WebServer.run(WebServer.java:343)
at org.jboss.web.ThreadPool$Worker.run(ThreadPool.java:163)
 

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