I have a local reproducer for [JDK-8360595](https://bugs.openjdk.org/browse/JDK-8360595), and I only now understood why it crashed badly, without producing a proper error. This is because you are not allowed to pass `oop`-s to C++ methods. Because with checked oops, `oop` is really a wrapper class, not a pointer. We should be passing `oopDesc*`.
I also extended the platform filter for the test, so reproducer can work on my x86 machines, and it now crashes more reliably: $ CONF=linux-x86_64-server-fastdebug make images test TEST=java/foreign/TestUpcallStress.java TEST_VM_OPTS="-XX:+UnlockExperimentalVMOptions -XX:+UseEpsilonGC -XX:-ExitOnOutOfMemoryError" ... [12:37:47.635] test TestUpcallStress.testUpcallsStress(663, "f1_V_SD_DID", VOID, [STRUCT, DOUBLE], [DOUBLE, INT, DOUBLE]): success [25ms] Uncaught exception: java.lang.OutOfMemoryError: Java heap space <<no stack trace available>> Additional testing: - [x] Linux x86_64 server fastdebug, reproducer no longer cryptically --------- - [x] I confirm that I make this contribution in accordance with the [OpenJDK Interim AI Policy](https://openjdk.org/legal/ai). ------------- Commit messages: - Fix Changes: https://git.openjdk.org/jdk/pull/31151/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=31151&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8371949 Stats: 3 lines in 3 files changed: 0 ins; 0 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/31151.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/31151/head:pull/31151 PR: https://git.openjdk.org/jdk/pull/31151
