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https://issues.apache.org/jira/browse/MNG-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17696228#comment-17696228
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ASF GitHub Bot commented on MNG-7716:
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asfgit merged PR #1027:
URL: https://github.com/apache/maven/pull/1027
> ConcurrencyDependencyGraph deadlock if no root can be selected
> --------------------------------------------------------------
>
> Key: MNG-7716
> URL: https://issues.apache.org/jira/browse/MNG-7716
> Project: Maven
> Issue Type: Bug
> Affects Versions: 3.8.7, 3.9.0, 4.0.0-alpha-4
> Reporter: Christoph Läubrich
> Assignee: Michael Osipov
> Priority: Major
> Fix For: 4.0.0, 4.0.0-alpha-5, 3.8.8, 3.9.1
>
>
> At Tycho we got a bug-report that results in a deadlock when calling the
> tycho-version-plugin:
> https://github.com/eclipse-tycho/tycho/issues/2169
> I debugged the problem and it seems that ConcurrencyDependencyGraph is
> actually the culprit here because it can return an empty list of projects to
> initially build. As no builds are scheduled then the code in the
> MultiThreadedBuilder waits forever for the result, this is what happening
> here:
> * There is one segment {code}org.faktorips:base:pom:23.6.0-SNAPSHOT ->
> [org.eclipse.tycho:tycho-versions-plugin:3.0.4-SNAPSHOT:set-version]{code}
> * This segment has a transitive reactor dependency to {code}MavenProject:
> org.faktorips:codequality-config:23.6.0-SNAPSHOT @
> faktorips.base/codequality-config/pom.xml{code} (this is not a problem
> because we only execute a reactor=true mojo!)
> * So now the loop finds that there is no "independent" project and returns an
> empty list
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