I've Tomcat 7.0.29 installed on linux/64.

@ service shutdown,

        sh /etc/init.d/tomcat7 stop

I see in my logs two "WARNING: Acceptor thread [null] failed to unlock.
Forcing hard socket shutdown":

                INFO: Deploying web application directory
                /usr/local/tomcat7/build/webapps/examples
                Jul 23, 2012 11:18:35 AM
                org.apache.catalina.core.ApplicationContext log
                INFO: ContextListener: contextInitialized()
                Jul 23, 2012 11:18:35 AM
                org.apache.catalina.core.ApplicationContext log
                INFO: SessionListener: contextInitialized()
                Jul 23, 2012 11:18:35 AM
                org.apache.catalina.core.ApplicationContext log
                INFO: ContextListener:
                attributeAdded('org.apache.jasper.compiler.TldLocationsCache',
                'org.apache.jasper.compiler.TldLocationsCache@14d6cc5e')
                Jul 23, 2012 11:18:35 AM
                org.apache.catalina.startup.HostConfig deployDirectory
                INFO: Deploying web application directory
                /usr/local/tomcat7/build/webapps/ROOT
                Jul 23, 2012 11:18:35 AM
                org.apache.catalina.startup.HostConfig deployDirectory
                INFO: Deploying web application directory
                /usr/local/tomcat7/build/webapps/host-manager
                Jul 23, 2012 11:18:36 AM
                org.apache.catalina.startup.HostConfig deployDirectory
                INFO: Deploying web application directory
                /usr/local/tomcat7/build/webapps/manager
                Jul 23, 2012 11:18:36 AM
                org.apache.catalina.startup.HostConfig deployDirectory
                INFO: Deploying web application directory
                /usr/local/tomcat7/build/webapps/docs
                Jul 23, 2012 11:18:36 AM
                org.apache.coyote.AbstractProtocol start
                INFO: Starting ProtocolHandler ["http-apr-8080"]
                Jul 23, 2012 11:18:36 AM
                org.apache.coyote.AbstractProtocol start
                INFO: Starting ProtocolHandler ["ajp-apr-8009"]
                Jul 23, 2012 11:18:36 AM
                org.apache.catalina.startup.Catalina start
                INFO: Server startup in 743 ms
                Jul 23, 2012 12:24:12 PM
                org.apache.coyote.AbstractProtocol pause
                INFO: Pausing ProtocolHandler ["http-apr-8080"]
                Jul 23, 2012 12:24:12 PM
                org.apache.coyote.AbstractProtocol pause
                INFO: Pausing ProtocolHandler ["ajp-apr-8009"]
                Jul 23, 2012 12:24:12 PM
                org.apache.catalina.core.StandardService stopInternal
                INFO: Stopping service Catalina
                Jul 23, 2012 12:24:12 PM
                org.apache.catalina.core.ApplicationContext log
                INFO: SessionListener: contextDestroyed()
                Jul 23, 2012 12:24:12 PM
                org.apache.catalina.core.ApplicationContext log
                INFO: ContextListener: contextDestroyed()
                Jul 23, 2012 12:24:12 PM
                org.apache.coyote.AbstractProtocol stop
                INFO: Stopping ProtocolHandler ["http-apr-8080"]
===>            Jul 23, 2012 12:24:22 PM
org.apache.tomcat.util.net.AprEndpoint stopInternal
                WARNING: Acceptor thread [null] failed to unlock.
                Forcing hard socket shutdown.
                Jul 23, 2012 12:24:22 PM
                org.apache.coyote.AbstractProtocol stop
                INFO: Stopping ProtocolHandler ["ajp-apr-8009"]
===>            Jul 23, 2012 12:24:32 PM
org.apache.tomcat.util.net.AprEndpoint stopInternal
                WARNING: Acceptor thread [null] failed to unlock.
                Forcing hard socket shutdown.
                Jul 23, 2012 12:24:32 PM
                org.apache.coyote.AbstractProtocol destroy
                INFO: Destroying ProtocolHandler ["http-apr-8080"]
                Jul 23, 2012 12:24:32 PM
                org.apache.coyote.AbstractProtocol destroy
                INFO: Destroying ProtocolHandler ["ajp-apr-8009"]


I'm not sure how much weight to give these warnings.

Can/should they be ignored?

Or does their cause need to be hunted down and fixed?

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