ADDITIONAL SYSTEM INFORMATION :
Linux version 3.10.0-957.21.3.el7.x86_64 (root@435399c7ddce) (gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC) ) #1 SMP

[root@name64 ~]# java -version
openjdk version "1.8.0_252"
OpenJDK Runtime Environment (build 1.8.0_252-b09)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)
You have new mail in /var/spool/mail/root

A DESCRIPTION OF THE PROBLEM :
OpneJDK Inet6Address.isReachable returns probabilistic true for non existing IP addresses In a non-root environment .
In a non-root environment, Continuous call Inet6Address.isReachable for a non exsiting IPV6 address will return: false false true false false true......
 If 1 second between each request，then will return: false true false true false true......
 If 2 second or more between each request，then will return correctly: false false false false false false......

I test openJDK1.11.0.7 、openJDK1.14.0.1 in the same environment, I can always get the correct results.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
In a non-root environment, Continuous call Inet6Address.isReachable for a non exsiting IPV6 address

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
false false true false false true......

FREQUENCY : always