Ben Caradoc-Davies created MNG-6323:
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Summary: Deadlock in multithreaded dependency resolution
Key: MNG-6323
URL: https://issues.apache.org/jira/browse/MNG-6323
Project: Maven
Issue Type: Bug
Affects Versions: 3.5.2
Reporter: Ben Caradoc-Davies
Attachments: geoserver-community-maven-hang-jstack-2.txt,
geoserver-community-maven-hang-jstack.txt
Maven 3.5.2 multithreaded builds experience a deadlock not seen with Maven
3.5.0.
To reproduce the issue, clone GeoServer:
{noformat}
git clone https://github.com/geoserver/geoserver.git
cd geoserver
{noformat}
Build GeoServer community modules with:
{noformat}
mvn -f src/community/pom.xml -B -T4 -U -Prelease -PcommunityRelease -DskipTests
clean install
{noformat}
Builds that normally take 2-4 minutes instead experience long hangs. {{jstack}}
output (attached) suggests a deadlock (two different hangs attached). Some of
the locks are in {{TIME_WAIT}} and eventually the build completes after 30-45
minutes, but this is enough to cause builds on Travis to be killed for their
failure to output for ten minutes. (Travis upgraded to Maven 3.5.2 a week ago.)
I have only seen the failures with -U. The hang does not occur in
single-threaded builds.
See also discussion on the geoserver-devel mailing list:
http://osgeo-org.1560.x6.nabble.com/Travis-failures-started-with-new-trusty-images-td5346836.html
See also discussion
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