https://issues.apache.org/bugzilla/show_bug.cgi?id=45608
Summary: Race conditions on field countAllocated of class
org.apache.catalina.core.StandardWrapper
Product: Tomcat 6
Version: 6.0.13
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
We found field countAllocated are accessed by allocate() and deallocate()
without any protections by locks.
Here is a trace log,
Thread http-8081-1 id: 23 : READ
[org.apache.catalina.core.StandardWrapper : allocate : 820]
[org.apache.catalina.core.StandardWrapperValve : invoke : 129]
[org.apache.catalina.core.StandardContextValve : invoke : 175]
[org.apache.catalina.core.StandardHostValve : invoke : 128]
[org.apache.catalina.valves.ErrorReportValve : invoke : 104]
[org.apache.catalina.core.StandardEngineValve : invoke : 109]
[org.apache.catalina.connector.CoyoteAdapter : service : 261]
[org.apache.coyote.http11.Http11Processor : process : 844]
[org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler :
process : 581]
[org.apache.tomcat.util.net.JIoEndpoint$Worker : run : 447]
[java.lang.Thread : run : 735]
Thread http-8081-4 id: 26 : WRITE
[org.apache.catalina.core.StandardWrapper : deallocate : 871]
[org.apache.catalina.core.StandardWrapperValve : invoke : 298]
[org.apache.catalina.core.StandardContextValve : invoke : 175]
[org.apache.catalina.core.StandardHostValve : invoke : 128]
[org.apache.catalina.valves.ErrorReportValve : invoke : 104]
[org.apache.catalina.core.StandardEngineValve : invoke : 109]
[org.apache.catalina.connector.CoyoteAdapter : service : 261]
[org.apache.coyote.http11.Http11Processor : process : 844]
[org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler :
process : 581]
[org.apache.tomcat.util.net.JIoEndpoint$Worker : run : 447]
[java.lang.Thread : run : 735]
Thread http-8081-4 and http-8081-1 will access countAllocated in parallel.
Since increment and decrement is *NOT* atomic, we think it is a potential race
condition.
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