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https://issues.apache.org/jira/browse/MNG-7716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Michael Osipov closed MNG-7716.
-------------------------------
Resolution: Fixed
Fixed with
[f41d533e7133968f23664cf8cdde832dd305e16e|https://gitbox.apache.org/repos/asf?p=maven.git&a=commit&h=f41d533e7133968f23664cf8cdde832dd305e16e],
with
[837db7a756164cadd978e53f8c566f0f14b79b6c|https://gitbox.apache.org/repos/asf?p=maven.git&a=commit&h=837db7a756164cadd978e53f8c566f0f14b79b6c]
for maven-3.9.x, with
[a0f460ca5807bb98561e1ed123fd28302c4fa0f3|https://gitbox.apache.org/repos/asf?p=maven.git&a=commit&h=a0f460ca5807bb98561e1ed123fd28302c4fa0f3]
for maven-3.8.x and ITs with
[671cbfd274fa9516efb5a02b5cdd704e833f3d56|https://gitbox.apache.org/repos/asf?p=maven-integration-testing.git&a=commit&h=671cbfd274fa9516efb5a02b5cdd704e833f3d56].
> 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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