[jdk17] RFR: JDK-8266310: deadlock between System.loadLibrary and JNI FindClass loading another class

[Alan Bateman]

On Mon, 21 Jun 2021 13:26:14 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Resubmitting the following PR https://github.com/openjdk/jdk/pull/3976 against JDK17.
>> 
>> This fixes the deadlock in ClassLoader between the two lock objects - a lock object associated with the class being loaded, and the ClassLoader.loadedLibraryNames hash map, locked during the native library load operation.
>> 
>> Further details can be found in the original PR.
>> 
>> Testing: jtreg and jck testing with no regressions. A new regression test was developed.
>
> @voitylov JDK 17 is an RDP 1 and I wonder if this long standing issue is critical or not. I've skimmed through the changes and I don't see any issue but if this is really intended for openjdk/jdk17 then I think it would be useful to have more eyes on it.

> @AlanBateman is it ok with you?

Okay with me but as a general point I don't think we should be fixing long standing issues in risky areas during RDP1. This is a change that really needs several months of bake time.

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PR: https://git.openjdk.java.net/jdk17/pull/96