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https://issues.apache.org/jira/browse/AMQ-9658?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christopher L. Shannon resolved AMQ-9658.
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Resolution: Fixed
> TcpTransport volatile receiveCounter is not incremented atomically
> ------------------------------------------------------------------
>
> Key: AMQ-9658
> URL: https://issues.apache.org/jira/browse/AMQ-9658
> Project: ActiveMQ Classic
> Issue Type: Bug
> Affects Versions: 5.18.6, 6.1.5
> Reporter: Christopher L. Shannon
> Assignee: Christopher L. Shannon
> Priority: Minor
> Fix For: 6.2.0, 5.19.0, 6.1.6
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> incrementing volatile integers is not an atomic operation because the
> previous value must first be read, then incremented, and reset so it is a
> multi step process. I noticed in the TCP transport code that the receive
> counter was a volatile integer and not being incremented properly. This
> counter is should only be incremented in the same thread anyways (it can be
> read by other threads like inactivity monitor) so it may not technically be
> an issue in practice but it still should be handled properly.
> The fix is to switch to an AtomicInteger. I also noticed a minor improvement
> to make to to the NIOSSLtransport init code that is only used for the
> auto+nio+ssl transport that I will fix as well. (ensure the full
> initialization buffer will always be entirely read and processed when using
> the auto+nio+ssl transport. )
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