[SSHD-307] NPE in org.apache.sshd.common.session.AbstractSession.getSession

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.9.0
• Fix Version/s: 0.11.0
• Environment: Apache 2.2.15 , RHEL 6.5
• Assignee: Guillaume Nodet
• Reporter: Domenic Alessi
• Created: 01/Apr/14 13:51
• Updated: 14/Apr/14 11:38
• Resolved: 07/Apr/14 10:07

Description

We are running gerrit 2.7 and this is packaged with SSHD 0.9.0. We see NPE in and also at a certain point all SSH commands hang. CPUs maxed out. There are no outofmemory errors.

2014-03-31 12:25:55,339|WARN |NioProcessor-4|AbstractSession| Exception caught
java.lang.NullPointerException
at org.apache.sshd.common.session.AbstractSession.getSession(AbstractSession.java:184)
at org.apache.sshd.server.session.ServerSession.getActiveSessionCountForUser(ServerSession.java:564)
at org.apache.sshd.server.session.ServerSession.userAuth(ServerSession.java:482)
at org.apache.sshd.server.session.ServerSession.handleMessage(ServerSession.java:212)
at org.apache.sshd.common.session.AbstractSession.decode(AbstractSession.java:587)
at org.apache.sshd.common.session.AbstractSession.messageReceived(AbstractSession.java:253)
at org.apache.sshd.common.AbstractSessionIoHandler.messageReceived(AbstractSessionIoHandler.java:54)
at org.apache.sshd.common.io.mina.MinaService.messageReceived(MinaService.java:94)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$TailFilter.messageReceived(DefaultIoFilterChain.java:690)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.access$1200(DefaultIoFilterChain.java:47)
at org.apache.mina.core.filterchain.DefaultIoFilterChain$EntryImpl$1.messageReceived(DefaultIoFilterChain.java:765)
at org.apache.mina.core.filterchain.IoFilterAdapter.messageReceived(IoFilterAdapter.java:109)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.callNextMessageReceived(DefaultIoFilterChain.java:417)
at org.apache.mina.core.filterchain.DefaultIoFilterChain.fireMessageReceived(DefaultIoFilterChain.java:410)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.read(AbstractPollingIoProcessor.java:710)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:664)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.process(AbstractPollingIoProcessor.java:653)
at org.apache.mina.core.polling.AbstractPollingIoProcessor.access$600(AbstractPollingIoProcessor.java:67)
at org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run(AbstractPollingIoProcessor.java:1124)
at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)