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https://issues.apache.org/jira/browse/AMQ-9546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17873068#comment-17873068
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Eddie Wu commented on AMQ-9546:
-------------------------------
Thanks [~cshannon]
Yes. it worked.
set {{maxFrameSize}} can prevent OOM issues. (we set it to 20MB)
just curious why we encountered OOM with default Frame Size: 256MB)
Regards,
Eddie
> Potential direct buffer memory leak triggered by security scan
> --------------------------------------------------------------
>
> Key: AMQ-9546
> URL: https://issues.apache.org/jira/browse/AMQ-9546
> Project: ActiveMQ Classic
> Issue Type: Bug
> Components: Broker
> Affects Versions: 5.18.3
> Environment: Linux version 4.12.14-122.216-default
> (gcc version 4.8.5 (SUSE Linux) )
> Tomcat: 9.0.86
> ActiveMQ: 5.18.3
> Reporter: Eddie Wu
> Priority: Major
>
> We encountered following WARN log from Active MQ 5.18.3. which is embed in
> Tomcat 9.0.86.
> {noformat}
> WARN [Transport] Transport Connection to tcp://xxxx:yyyy failed: Cannot
> reserve 1195725860 bytes of direct buffer memory (allocated: 909477781,
> limit: 1073741824){noformat}
> {{tcp://xxxx:yyyy}} is our security scan software.
> We realize that the security scan software will trigger direct buffer memory
> leak from ActiveMQ.
> # We have internal metrics for direct buffer memory usage. It is clear that
> direct buffer usage will spike when scanning happened.
> # We have log as above to know that the scan did cause ActiveMQ to allocate
> huge direct buffer memory.
> Even though the leak is NOT triggered by usual business code, I think it is
> still worth to fix.
> Anyway it is a potential memory leak bug inside ActiveMQ.
> I have not get call stack yet. but since the code using direct buffer is NOT
> that much, maybe you can review the code to figure out the root cause of
> memory leak.
> Let me know if you need more details.
> --just for your information, per our initial check, the log above was from
> code below.
> [https://github.com/apache/activemq/blob/74086d70bcf2db9ef98e3699c1bf1eb5910c2baa/activemq-broker/src/main/java/org/apache/activemq/broker/TransportConnection.java#L1188]
>
> {code:java}
> @Override
> public String toString() {
> return "Transport Connection to: " + transport.getRemoteAddress();
> }
> public void serviceTransportException(IOException e) {
> if (!stopping.get() && status.get() != PENDING_STOP) {
> transportException.set(e);
> if (TRANSPORTLOG.isDebugEnabled()) {
> TRANSPORTLOG.debug("{} failed: {}", this, e.getMessage(), e);
> } else if (TRANSPORTLOG.isWarnEnabled() && !suppressed(e)) {
> if (connector.isDisplayStackTrace()) {
> TRANSPORTLOG.warn("{} failed", this, e);
> } else {
> TRANSPORTLOG.warn("{} failed: {}", this, e.getMessage());
> }
> }
> stopAsync(e);
> }
> }{code}
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