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https://issues.apache.org/jira/browse/DIRMINA-1169?focusedWorklogId=813939&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-813939
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ASF GitHub Bot logged work on DIRMINA-1169:
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Author: ASF GitHub Bot
Created on: 05/Oct/22 19:55
Start Date: 05/Oct/22 19:55
Worklog Time Spent: 10m
Work Description: tomaswolf commented on PR #35:
URL: https://github.com/apache/mina/pull/35#issuecomment-1264660539
@elecharny could you please take look and merge this if you think it's OK?
And then merge or cherry-pick it to the 2.1.X and 2.2.X branches? I'm a bit
confused by the git history of this repo, and it's not clear to me how you
manage back-ports or fixes in old versions, otherwise I might be able to do so
myself. The three 2.* branches seem to be completely separate. That's not what
I'm used to from EGit or JGit, where after a fix on an old maintenance branch
we merge the change up to the current master/main branch.
Having a 2.0.24 including the fix would also be useful. Currently we have
disabled one test in Apache MINA sshd because of this problem.
Issue Time Tracking
-------------------
Worklog Id: (was: 813939)
Time Spent: 0.5h (was: 20m)
> BindException on Java >= 11 due to race condition in AbstractPollingIoAcceptor
> ------------------------------------------------------------------------------
>
> Key: DIRMINA-1169
> URL: https://issues.apache.org/jira/browse/DIRMINA-1169
> Project: MINA
> Issue Type: Bug
> Affects Versions: 2.0.23, 2.1.6, 2.2.1
> Reporter: Thomas Wolf
> Priority: Major
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> See also SSHD-1256.
> The main acceptor loop does basically (somewhat simplified):
> {code:java}
> while (selectable) {
> registerHandles(); // Process registration queue: add new sockets (from
> bind()) to the selector with OP_ACCEPT, fulfills their open futures
> int selected = select();
> if (/* nothing to do */) {
> break; // and end the thread; higher layers will create a new one if
> needed
> }
> if (selected > 0) {
> processHandles(selectedHandles()); // Handle and hand off new connections
> }
> unregisterHandles(); // Process cancel queue: cancel SelectionKey, close
> ServerSocketChannel, fulfill the cancel future
> }
> {code}
> With Java 11, unbinding a {{ServerSocketChannel}} changed:
> * [JDK-8214430|https://bugs.openjdk.org/browse/JDK-8214430]
> * [Java 11 Release
> Notes|https://www.oracle.com/java/technologies/javase/11-relnote-issues.html#JDK-8198562]
> Essentially the unbind gives up the socket only at the next {{select()}}
> call. This causes two problems in Apache MINA's acceptor:
> * The unbind future is set "done" before the socket is actually released.
> * If a new binding for one of the unbound sockets is registered before that
> {{select()}} has been done, {{registerHandles()}} gets a {{BindException}}
> ("address already in use").
> So for Java >= 11, the code must ensure that there is a {{select()}} between
> processing unbindings and processing new bindings, and the unbind futures
> must be set "done" only after that {{select()}}.
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