On Tue, 30 Sep 2025 21:32:01 GMT, Leonid Mesnik <[email protected]> wrote:
> The field access/modification events set interp only mode and compiled frame > is not expected. However JNI might call `post_field_access_by_jni` while the > last java frame is compiled. > > 1) The thread switched to interponly mode while it is in JNI code. The > deoptimization is triggered but each frame is really changed only execution > returns to it. So last java frame was not executed and thus is still > compiled. > 2) The JNI accessed field from the thread where field events are not enabled. > So the `post_field_access_by_jni` is called in threads in interp_only mode. > > The original example doesn't reproduce issue because of JDK changes and I > don't know of it is 1) or 2)I. I implemented regression test for both > problems. > > The location should be zero for JNI access. This pull request has now been integrated. Changeset: 4f9f0868 Author: Leonid Mesnik <[email protected]> URL: https://git.openjdk.org/jdk/commit/4f9f086847f531ab1791727d74955cfd8ec56811 Stats: 336 lines in 4 files changed: 329 ins; 0 del; 7 mod 8224852: JVM crash on watched field access from native code Reviewed-by: amenkov, sspitsyn ------------- PR: https://git.openjdk.org/jdk/pull/27584
