WebappClassLoader deadlock if web application uses it's own classloader

Issue

Tomcat6 deadlocks on WebappClassLoader :

Found one Java-level deadlock:
=============================
"http-8080-6":
  waiting to lock monitor 0x1731bafc (object 0x08189dd0, a org.apache.catalina.loader.WebappClassLoader),
  which is held by "http-8080-1"
"http-8080-1":
  waiting to lock monitor 0x1731b88c (object 0x13bdb118, a java.lang.String),
  which is held by "http-8080-5"
"http-8080-5":
  waiting to lock monitor 0x1731bafc (object 0x08189dd0, a org.apache.catalina.loader.WebappClassLoader),
  which is held by "http-8080-1"

Note : Logs above are extracted from upstream tomcat bugzilla