https://issues.apache.org/bugzilla/show_bug.cgi?id=52353
Bug #: 52353
Summary: Possibility of unsynchronized concurrent access to
field
"org.apache.catalina.tribes.group.ChannelInterceptorBa
se.next"
Product: Tomcat 7
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: [email protected]
ReportedBy: [email protected]
Classification: Unclassified
Method "org.apache.catalina.tribes.group.ChannelInterceptorBase.getNext()" is
reachable from method
org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor.run(),
which implements the run method of a "Runnable" class. The following is a
sequence of method calls from "MessageDispatchInterceptor.run()" to
"ChannelInterceptorBase.getNext()":
1.
org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor.run()
2.
org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor.sendAsyncData(LinkObject)
3.
org.apache.catalina.tribes.group.ChannelInterceptorBase.sendMessage(Member[],
ChannelMessage, InterceptorPayload)
4. org.apache.catalina.tribes.group.ChannelInterceptorBase.getNext()
Similarly,
"org.apache.catalina.tribes.group.ChannelInterceptorBase.setNext(ChannelInterceptor)"
may be called from
"org.apache.catalina.tribes.demos.CoordinationDemo.cmdStart(...).new Thread()
{...}.run()", which implements the "run" method of a "Thread". The following is
a sequence of method calls that shows the possibility of invoking
"ChannelInterceptorBase.setNext(ChannelInterceptor)" from a "Thread":
1. org.apache.catalina.tribes.demos.CoordinationDemo.cmdStart(...).new Thread()
{...}.run()
2. org.apache.catalina.tribes.demos.CoordinationDemo.Status.start()
3. org.apache.catalina.tribes.demos.CoordinationDemo.Status.createChannel()
4.
org.apache.catalina.tribes.group.GroupChannel.addInterceptor(ChannelInterceptor)
5.
org.apache.catalina.tribes.group.ChannelInterceptorBase.setNext(ChannelInterceptor)
Since field "org.apache.catalina.tribes.group.ChannelInterceptorBase.next" may
get accessed concurrently, it should get properly synchronized.
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