java/net/InetAddress/ptr/Lookup.java fails intermittently due to reverse lookup failed

----------System.out:(4/449)----------
Executing: [/home/aginfra/sandbox_keepme/jdk/bin/java, -Djava.net.preferIPv4Stack=true, -cp, /home/aginfra/sandbox_keepme/results/run_333/tier2/JTwork/test_jdk_0/classes/51/java/net/InetAddress/ptr/Lookup.d:/home/aginfra/sandbox_keepme/results/run_333/tier2/JTwork/test_jdk_0/classes/51/test/lib, Lookup]
[2019-09-13T17:18:36.438735Z] Gathering output for process 97947
IPv4 lookup results: [192.0.43.7:icann.org]
(default) 192.0.43.7--> 192.0.43.7
----------System.err:(12/740)----------
java.lang.RuntimeException: Mismatch between default and java.net.preferIPv4Stack=true results
at Lookup.main(Lookup.java:89)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
at java.base/java.lang.Thread.run(Thread.java:830)