JDK 8u20 javac StackOverflowError at com.sun.tools.javac.code.Types.lub (regression)

[Neon Ngo]

When trying to build our project's code using JDK 8u20's, javac craps
out with a StackOverflowError.
This worked fine in all prior versions of t he JDK (e.g. 8u11, 7u67,
6u45, etc.) so this is a regression in the compiler.
This happens on RHEL 5.10 64-bit, CentOS 6.5 32-bit & 64-bit, RHEL 7
64-bit, etc.

java version "1.8.0_20"
Java(TM) SE Runtime Environment (build 1.8.0_20-b26)
Java HotSpot(TM) 64-Bit Server VM (build 25.20-b23, mixed mode)
javac 1.8.0_20

The system is out of resources.
Consult the following stack trace for details.
java.lang.StackOverflowError
        at com.sun.tools.javac.code.Types.lub(Types.java:3532)
        at com.sun.tools.javac.code.Types.lub(Types.java:3616)
        at com.sun.tools.javac.code.Types.lub(Types.java:3616)
        at com.sun.tools.javac.code.Types.lub(Types.java:3616)
        at com.sun.tools.javac.code.Types.lub(Types.java:3616)
...

This issue seems similar to JDK-8043725 javac fails with StackOverflowException
https://bugs.openjdk.java.net/browse/JDK-8043725

But the stack trace is different.

We can always reproduce this problem.

Regards,

Neon