https://issues.apache.org/bugzilla/show_bug.cgi?id=52926
Bug #: 52926
Summary: NPE in processSocket
Product: Tomcat 7
Version: 7.0.25
Platform: PC
OS/Version: Linux
Status: NEW
Severity: critical
Priority: P2
Component: Connectors
AssignedTo: dev@tomcat.apache.org
ReportedBy: mor...@ethlo.com
Classification: Unclassified
We have sporadic issues triggering 502 proxy errors using the NIO connector
behind Nginx, caused by dropped connections/end of streams in Tomcat. The
Tomcat log shows:
SEVERE: Error allocating socket processor
java.lang.NullPointerException
at org.apache.tomcat.util.net.NioEndpoint.processSocket(NioEndpoint.java:721)
at
org.apache.tomcat.util.net.NioEndpoint$Poller.cancelledKey(NioEndpoint.java:1048)
at org.apache.tomcat.util.net.NioEndpoint$Poller.timeout(NioEndpoint.java:1392)
at org.apache.tomcat.util.net.NioEndpoint$Poller.run(NioEndpoint.java:1174)
at java.lang.Thread.run(Thread.java:662)
Looking at the code in processSocket I see the line in NioEndpoint(721):
attachment.setCometNotify(false); //will get reset upon next reg
Attachment is fetched in line 720:
KeyAttachment attachment = (KeyAttachment)socket.getAttachment(false);
Looking at socket.getAttachement() method I see that this method is indeed
capable of returning null, but no null-check for this is done (although it is
in multiple other locations, so it seems inconsistent).
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