RFR (S) 8218851: JVM crash in custom classloader stress test, JDK 12 & 13

[charlie hunt]

Not an official "Reviewer".

Looks good, and can confirm it fixes the issue I observed. :-)

Charlie

On 2/14/19 10:58 AM, coleen.phillimore at oracle.com wrote:
> Summary: Handle NULL and unloaded constraint class in loader 
> constraint table, also cope with unloaded but not cleaned out klass in 
> loader constraint entries.
>
> Tested overnight with the application that caused the crash. Tested 
> with hs tier1-6.   Tested JCKs with ZGC.
>
> open webrev at http://cr.openjdk.java.net/~coleenp/2019/8218851.01/webrev
> bug link https://bugs.openjdk.java.net/browse/JDK-8218851
>
> Thanks,
> Coleen