https://issues.apache.org/bugzilla/show_bug.cgi?id=50138
Summary: Lack of synchronization in
org.apache.catalina.security.SecurityUtil
Product: Tomcat 6
Version: 6.0.29
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: [email protected]
ReportedBy: [email protected]
Symptom: all processor threads spin madly in:
==============
"tomcat-processor-20" daemon prio=10 tid=0x09210800 nid=0x51fb runnable
[0x61b76000]
java.lang.Thread.State: RUNNABLE
at java.util.HashMap.getEntry(HashMap.java:347)
at java.util.HashMap.containsKey(HashMap.java:335)
at
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:227)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
at
org.apache.catalina.core.ApplicationFilterChain.access$000(ApplicationFilterChain.java:56)
at
org.apache.catalina.core.ApplicationFilterChain$1.run(ApplicationFilterChain.java:189)
at java.security.AccessController.doPrivileged(Native Method)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:185)
...
==============
Cause: org.apache.catalina.security.SecurityUtil.objectCache is a HashMap, but
access to it is not synchronized. The javadoc for HashMap says:
=============
Note that this implementation is not synchronized. If multiple threads access a
hash map concurrently, and at least one of the threads modifies the map
structurally, it must be synchronized externally.
=============
Proposed solution: change objectCache to ConcurrentHashMap;
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