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Comments (11)

aressem avatar aressem commented on April 27, 2024 4

I'm fixing the zookeeper issues. This is related to a bad vespa-dev docker image that was missing the zookeeper packages.

New vespa-dev image is built and Travis job is back to green state.

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bjorncs avatar bjorncs commented on April 27, 2024 1

Me and @hakonhall had a debugging session yesterday. We identified ApplicationSuspensionResourceTest as the culprit. There is a JNI orJVM OoM issue somewhere triggered by https://github.com/vespa-engine/vespa/blob/master/orchestrator/src/test/java/com/yahoo/vespa/orchestrator/resources/ApplicationSuspensionResourceTest.java#L44 the second time the @Before initializer is executed. Application.fromApplicationPackage eats up all memory on the host and gets killed by the kernel.
The unit test is now temporarily disabled.

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hakonhall avatar hakonhall commented on April 27, 2024

Going through the failed Travis builds, there are between 0 and 4 successful non-cancelled builds between each fail (0, 1, 1, 3, 3, and 4). It's mostly failing on orchestrator module, with a JVM exit with no further info (6), but is sometimes also failing with what may be related (3, one explicitly says Travis is unable to allocate memory).

Given this frequency, I'm guessing this started ~3 days ago somewhere around the time enforce-container-dependencies PR started going in, which required a maven upgrade to 3.3.9, but that was reverted @bjorncs ?

The last changes in orchestrator I would have suspected went in ~10 days ago.

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bjorncs avatar bjorncs commented on April 27, 2024

Yeah, we reverted back to Maven 3.0.5. It could be the case that the surefire plugin is running out of heap space. Are the orchestrator unit tests known for consuming a lot of memory?

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hakonhall avatar hakonhall commented on April 27, 2024

Some tests uses a curator test zookeeper instance - perhaps that's using a lot of memory. Could we run with more debug info on the Maven run to confirm it's java heap issue?

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mpolden avatar mpolden commented on April 27, 2024

There's also some instability in the C++ build, which fails building some ZooKeeper things. Example: https://travis-ci.org/vespa-engine/vespa/jobs/281224379

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mpolden avatar mpolden commented on April 27, 2024

And https://travis-ci.org/vespa-engine/vespa/jobs/281202332 and https://travis-ci.org/vespa-engine/vespa/jobs/281190305 and https://travis-ci.org/vespa-engine/vespa/jobs/281166179 and https://travis-ci.org/vespa-engine/vespa/jobs/280865969.

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bjorncs avatar bjorncs commented on April 27, 2024

The JVM is exiting with exit code 137 on either ApplicationSuspensionResourceTest or ZookeeperStatusServiceTest. I could not find any trace where System.exit is called (tried to detect unexpected calls to System.exit through SecurityManager with no success). Output below generated with mvn -nsu -X test in ochestrator module, with surefire version 2.20.1 (which has improved debug output over 2.19).

[INFO] Running com.yahoo.vespa.orchestrator.resources.HostResourceTest
[INFO] Tests run: 10, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.55 s - in com.yahoo.vespa.orchestrator.resources.HostResourceTest
[INFO] Running com.yahoo.vespa.orchestrator.resources.ApplicationSuspensionResourceTest
[WARNING] Tests run: 6, Failures: 0, Errors: 0, Skipped: 1, Time elapsed: 9.331 s - in com.yahoo.vespa.orchestrator.resources.ApplicationSuspensionResourceTest
[INFO] Running com.yahoo.vespa.orchestrator.policy.HostedVespaPolicyTest
[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.073 s - in com.yahoo.vespa.orchestrator.policy.HostedVespaPolicyTest
[INFO] Running com.yahoo.vespa.orchestrator.policy.HostedVespaClusterPolicyTest
[INFO] Tests run: 8, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.083 s - in com.yahoo.vespa.orchestrator.policy.HostedVespaClusterPolicyTest
[INFO] Running com.yahoo.vespa.orchestrator.OrchestratorUtilTest
[INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.006 s - in com.yahoo.vespa.orchestrator.OrchestratorUtilTest
[INFO] Running com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
[INFO]
[INFO] Results:
[INFO]
[WARNING] Tests run: 28, Failures: 0, Errors: 0, Skipped: 1
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 22.169s
[INFO] Finished at: Mon Oct 02 17:01:59 UTC 2017
[INFO] Final Memory: 22M/284M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.20.1:test (default-test) on project orchestrator: There are test failures.
[ERROR]
[ERROR] Please refer to /root/vespa/orchestrator/target/surefire-reports for the individual test results.
[ERROR] Please refer to dump files (if any exist) [date]-jvmRun[N].dump, [date].dumpstream and [date]-jvmRun[N].dumpstream.
[ERROR] The forked VM terminated without properly saying goodbye. VM crash or System.exit called?
[ERROR] Command was /bin/sh -c cd /root/vespa/orchestrator && /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java -jar /root/vespa/orchestrator/target/surefire/surefirebooter7789100222818791915.jar /root/vespa/orchestrator/target/surefire 2017-10-02T17-01-41_121-jvmRun1 surefire3360037546223410835tmp surefire_01378900282442887882tmp
[ERROR] Error occurred in starting fork, check output in log
[ERROR] Process Exit Code: 137
[ERROR] Crashed tests:
[ERROR] com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
[ERROR] org.apache.maven.surefire.booter.SurefireBooterForkException: The forked VM terminated without properly saying goodbye. VM crash or System.exit called?
[ERROR] Command was /bin/sh -c cd /root/vespa/orchestrator && /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java -jar /root/vespa/orchestrator/target/surefire/surefirebooter7789100222818791915.jar /root/vespa/orchestrator/target/surefire 2017-10-02T17-01-41_121-jvmRun1 surefire3360037546223410835tmp surefire_01378900282442887882tmp
[ERROR] Error occurred in starting fork, check output in log
[ERROR] Process Exit Code: 137
[ERROR] Crashed tests:
[ERROR] com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
[ERROR] at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:686)
[ERROR] at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:535)
[ERROR] at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:280)
[ERROR] at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:245)
[ERROR] at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeProvider(AbstractSurefireMojo.java:1124)
[ERROR] at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked(AbstractSurefireMojo.java:954)
[ERROR] at org.apache.maven.plugin.surefire.AbstractSurefireMojo.execute(AbstractSurefireMojo.java:832)
[ERROR] at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
[ERROR] at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
[ERROR] at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
[ERROR] at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
[ERROR] at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
[ERROR] at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
[ERROR] at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
[ERROR] at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
[ERROR] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[ERROR] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[ERROR] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[ERROR] at java.lang.reflect.Method.invoke(Method.java:498)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:414)
[ERROR] at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:357)
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.20.1:test (default-test) on project orchestrator: There are test failures.

Please refer to /root/vespa/orchestrator/target/surefire-reports for the individual test results.
Please refer to dump files (if any exist) [date]-jvmRun[N].dump, [date].dumpstream and [date]-jvmRun[N].dumpstream.
The forked VM terminated without properly saying goodbye. VM crash or System.exit called?
Command was /bin/sh -c cd /root/vespa/orchestrator && /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java -jar /root/vespa/orchestrator/target/surefire/surefirebooter7789100222818791915.jar /root/vespa/orchestrator/target/surefire 2017-10-02T17-01-41_121-jvmRun1 surefire3360037546223410835tmp surefire_01378900282442887882tmp
Error occurred in starting fork, check output in log
Process Exit Code: 137
Crashed tests:
com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
org.apache.maven.surefire.booter.SurefireBooterForkException: The forked VM terminated without properly saying goodbye. VM crash or System.exit called?
Command was /bin/sh -c cd /root/vespa/orchestrator && /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java -jar /root/vespa/orchestrator/target/surefire/surefirebooter7789100222818791915.jar /root/vespa/orchestrator/target/surefire 2017-10-02T17-01-41_121-jvmRun1 surefire3360037546223410835tmp surefire_01378900282442887882tmp
Error occurred in starting fork, check output in log
Process Exit Code: 137
Crashed tests:
com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:686)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:535)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:280)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:245)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeProvider(AbstractSurefireMojo.java:1124)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked(AbstractSurefireMojo.java:954)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.execute(AbstractSurefireMojo.java:832)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:414)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:357)

	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:217)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:414)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:357)
Caused by: org.apache.maven.plugin.MojoExecutionException: There are test failures.

Please refer to /root/vespa/orchestrator/target/surefire-reports for the individual test results.
Please refer to dump files (if any exist) [date]-jvmRun[N].dump, [date].dumpstream and [date]-jvmRun[N].dumpstream.
The forked VM terminated without properly saying goodbye. VM crash or System.exit called?
Command was /bin/sh -c cd /root/vespa/orchestrator && /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java -jar /root/vespa/orchestrator/target/surefire/surefirebooter7789100222818791915.jar /root/vespa/orchestrator/target/surefire 2017-10-02T17-01-41_121-jvmRun1 surefire3360037546223410835tmp surefire_01378900282442887882tmp
Error occurred in starting fork, check output in log
Process Exit Code: 137
Crashed tests:
com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
org.apache.maven.surefire.booter.SurefireBooterForkException: The forked VM terminated without properly saying goodbye. VM crash or System.exit called?
Command was /bin/sh -c cd /root/vespa/orchestrator && /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java -jar /root/vespa/orchestrator/target/surefire/surefirebooter7789100222818791915.jar /root/vespa/orchestrator/target/surefire 2017-10-02T17-01-41_121-jvmRun1 surefire3360037546223410835tmp surefire_01378900282442887882tmp
Error occurred in starting fork, check output in log
Process Exit Code: 137
Crashed tests:
com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:686)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:535)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:280)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:245)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeProvider(AbstractSurefireMojo.java:1124)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked(AbstractSurefireMojo.java:954)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.execute(AbstractSurefireMojo.java:832)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
	at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
	at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
	at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
	at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
	at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
	at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
	at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
	at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
	at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:414)
	at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:357)

	at org.apache.maven.plugin.surefire.SurefireHelper.throwException(SurefireHelper.java:235)
	at org.apache.maven.plugin.surefire.SurefireHelper.reportExecution(SurefireHelper.java:112)
	at org.apache.maven.plugin.surefire.SurefirePlugin.handleSummary(SurefirePlugin.java:354)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked(AbstractSurefireMojo.java:984)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.execute(AbstractSurefireMojo.java:832)
	at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
	at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
	... 19 more
Caused by: org.apache.maven.surefire.booter.SurefireBooterForkException: The forked VM terminated without properly saying goodbye. VM crash or System.exit called?
Command was /bin/sh -c cd /root/vespa/orchestrator && /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.144-0.b01.el7_4.x86_64/jre/bin/java -jar /root/vespa/orchestrator/target/surefire/surefirebooter7789100222818791915.jar /root/vespa/orchestrator/target/surefire 2017-10-02T17-01-41_121-jvmRun1 surefire3360037546223410835tmp surefire_01378900282442887882tmp
Error occurred in starting fork, check output in log
Process Exit Code: 137
Crashed tests:
com.yahoo.vespa.orchestrator.status.ZookeeperStatusServiceTest
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:686)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.fork(ForkStarter.java:535)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:280)
	at org.apache.maven.plugin.surefire.booterclient.ForkStarter.run(ForkStarter.java:245)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeProvider(AbstractSurefireMojo.java:1124)
	at org.apache.maven.plugin.surefire.AbstractSurefireMojo.executeAfterPreconditionsChecked(AbstractSurefireMojo.java:954)
	... 22 more
[ERROR]
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

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mpolden avatar mpolden commented on April 27, 2024

Exit code 137 translates to 9 (137-128=9), SIGKILL. Maybe we're hitting the memory limit on Travis and the kernel's OOM killer kills the process?

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bjorncs avatar bjorncs commented on April 27, 2024

I doubt it is an OoM issue. I was able to reproduce it on a Docker container on my developer machine, with 8GB RAM and 2GB as default max heap size inside the container.

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mpolden avatar mpolden commented on April 27, 2024

Nice, in case the kernel killed it there should be a message in dmesg.

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