DeploymentScannerTestCase from wf-core fails intermittently

export SETTINGS_XML=`pwd`/tools/maven/conf/settings.xml
cd testsuite
for (( i = 1; i <= 100 ; i++ )) ; do
    echo $i
    mvn install -DfailIfNoTests=false -B -Dmaven.repo.local=$MAVEN_REPO_LOCAL -fae -s $SETTINGS_XML -llr -DfailIfNoTests=false -Dtest=DeploymentScannerTestCase
done

org.junit.ComparisonFailure: Unexpected outcome {
    "outcome" => "failed",
    "failure-description" => "WFLYCTL0436: Cannot register capability 'org.wildfly.management.deployment-scanner.testScanner' at location '[
    (\"subsystem\" => \"deployment-scanner\"),
    (\"scanner\" => \"testScanner\")
]' as it is already registered in context 'global' at location(s) '[[
    (\"subsystem\" => \"deployment-scanner\"),
    (\"scanner\" => \"testScanner\")
]]'",
    "rolled-back" => true
} of adding the test deployment scanner: {
    "operation" => "add",
    "address" => [
        ("subsystem" => "deployment-scanner"),
        ("scanner" => "testScanner")
    ],
    "scan-interval" => 1000,
    "path" => "/mnt/hudson_workspace/workspace/eap-7x-as-testsuite-test-core-rhel-deployment-scanner/4f840434/testsuite/standalone/target/tempDeployment"
} expected:<[success]> but was:<[failed]>
	at org.junit.Assert.assertEquals(Assert.java:115)
	at org.wildfly.core.test.standalone.mgmt.api.DeploymentScannerTestCase.addDeploymentScanner(DeploymentScannerTestCase.java:197)
	at org.wildfly.core.test.standalone.mgmt.api.DeploymentScannerTestCase.testAddRemove(DeploymentScannerTestCase.java:108)

[0m10:46:08,129 INFO  [org.jboss.as.server.deployment.scanner] (MSC service thread 1-1) WFLYDS0013: Started FileSystemDeploymentService for directory /tmp/DeploymentScannerTestCase/nonExistingPath
[0m[33m10:46:08,139 WARN  [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) WFLYDS0037: /tmp/DeploymentScannerTestCase/nonExistingPath does not exist
[0m[33m10:46:08,140 WARN  [org.jboss.as.server.deployment.scanner] (DeploymentScanner-threads - 1) WFLYDS0043: Deployment directory scan failed due to inaccessible deployment directory: /tmp/DeploymentScannerTestCase/nonExistingPath
[0m[0m10:46:08,269 INFO  [org.jboss.as.server.deployment.scanner] (MSC service thread 1-2) WFLYDS0013: Started FileSystemDeploymentService for directory /mnt/hudson_workspace/workspace/eap-7x-as-testsuite-test-core-rhel-deployment-scanner/4f840434/testsuite/standalone/target/tempDeployment
[0m[0m10:46:08,413 INFO  [org.jboss.as.server] (management-handler-thread - 2) WFLYSRV0236: Suspending server with no timeout.
[0m[0m10:46:08,430 INFO  [org.jboss.as.server] (Management Triggered Shutdown) WFLYSRV0241: Shutting down in response to management operation 'shutdown'
[0m[0m10:46:08,530 INFO  [org.jboss.as] (MSC service thread 1-3) WFLYSRV0050: WildFly Core 3.0.0.Beta13-redhat-1 "Kenny" stopped in 45ms
[0m