RFR: 8301737: java/rmi/server/UnicastRemoteObject/serialFilter/FilterUROTest.java fail with -Xcomp [v4]

[Roger Riggs]

On Fri, 10 Feb 2023 17:50:40 GMT, Mark Sheppard <msheppar at openjdk.org> wrote:

>> @msheppar It depends on the timing of GC and the unpredictable interactions between the compiler and gc.
>> If gc is particularly aggressive (as may be stimulated by -Xcomp), it may determine that the impl is no longer referenced even though it seems to be in the middle of the method.
>
> Would this behaviour be covered by the JLS and JVM specs ?

The JLS and JVMS specs do not constrain the implementation of GC.
The reachabilityFence() was introduced in JDK 9 by https://bugs.openjdk.org/browse/JDK-8133348.

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PR: https://git.openjdk.org/jdk/pull/12399