RFR: 8377712: ConstantPool of WeakReferenceKey is not deterministic in CDS archive

[Chen Liang]

On Wed, 11 Feb 2026 20:28:15 GMT, Ioi Lam <iklam at openjdk.org> wrote:

> We are seeing intermittent failures (12 times in Jan 2026) where the CDS archives generated in the JDK build is not deterministic.
> 
> The symptom is that (perhaps due to the peculiarity of hash codes and memory addressing??) the constant pool entry for `ReferenceKey<?>` in the `WeakReferenceKey` class is not resolved when the failure happens.
> 
> The fix is for the JVM to call a method in `WeakReferenceKey` to force this entry to be resolved.

I think a better approach might be in ReferencedKeyMap.prepareForAOTCache, after

        for (ReferenceKey<K> key : map.keySet()) {
            Object referent = key.get();

inject a call `key.equals(new StrongReferenceKey(referent))`, so that we hit the instanceof. What do you think? This code should be less reliant to weird translation hacks and requires less VM hacks.

-------------

PR Comment: https://git.openjdk.org/jdk/pull/29678#issuecomment-3887902436