Logs filling up with ZookeeperLoginModule User doesn't exist errors causing severe cpu depletion

Issue

We get several of these per second from time to time. Only cure so far is to restart the Fabric container.

2015-01-14 17:46:51,603 | WARN  | 974347944-193708 | GitSecureHttpContext             | c8.git.http.GitSecureHttpContext  161 | 102 - io.fabric8.fabric-git-server - 1.0.0.redhat-379 | Login failed
javax.security.auth.login.FailedLoginException: User doesn't exist
        at io.fabric8.jaas.ZookeeperLoginModule.login(ZookeeperLoginModule.java:134)
        at org.apache.karaf.jaas.boot.ProxyLoginModule.login(ProxyLoginModule.java:83)[karaf-jaas-boot.jar:]
        at sun.reflect.GeneratedMethodAccessor1259.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[:1.7.0_45]
        at java.lang.reflect.Method.invoke(Method.java:606)[:1.7.0_45]
        at javax.security.auth.login.LoginContext.invoke(LoginContext.java:784)[:1.7.0_45]
        at javax.security.auth.login.LoginContext.access$000(LoginContext.java:203)[:1.7.0_45]
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:698)[:1.7.0_45]
        at javax.security.auth.login.LoginContext$4.run(LoginContext.java:696)[:1.7.0_45]
        at java.security.AccessController.doPrivileged(Native Method)[:1.7.0_45]
        at javax.security.auth.login.LoginContext.invokePriv(LoginContext.java:695)[:1.7.0_45]
        at javax.security.auth.login.LoginContext.login(LoginContext.java:594)[:1.7.0_45]
        at io.fabric8.git.http.GitSecureHttpContext.doAuthenticate(GitSecureHttpContext.java:143)[102:io.fabric8.fabric-git-server:1.0.0.redhat-379]
        at io.fabric8.git.http.GitSecureHttpContext.handleSecurity(GitSecureHttpContext.java:96)[102:io.fabric8.fabric-git-server:1.0.0.redhat-379]
        at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:68)[100:org.ops4j.pax.web.pax-web-jetty:3.0.6]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:219)[100:org.ops4j.pax.web.pax-web-jetty:3.0.6]
        at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.ops4j.pax.web.service.jetty.internal.JettyServerHandlerCollection.handle(JettyServerHandlerCollection.java:77)[100:org.ops4j.pax.web.pax-web-jetty:3.0.6]
        at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.Server.handle(Server.java:370)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:494)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:971)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1033)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:667)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)[92:org.eclipse.jetty.aggregate.jetty-all-server:8.1.14.v20131031]
        at java.lang.Thread.run(Thread.java:744)[:1.7.0_45]
2015-01-14 17:46:51,613 | WARN  | 974347944-192698 | GitSecureHttpContext             | c8.git.http.GitSecureHttpContext  161 | 102 - io.fabric8.fabric-git-server - 1.0.0.redhat-379 | Login failed