Christoph Läubrich created MNG-7716:
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Summary: 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
Reporter: Christoph Läubrich
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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