RFR: 8279949: JavaThread::_free_handle_block leaks native memory

[Vladimir Ivanov]

On Sun, 13 Feb 2022 02:05:56 GMT, David Holmes <dholmes at openjdk.org> wrote:

>  think we need to understand exactly how we end up with a chain of blocks at thread exit 

My understanding is `JNIHandleBlock` is allocated on every upcall from VM to Java code (it's part of `JavaCallWrapper` ctor). Since it is possible to have "nested" upcalls (Java -> VM -> Java -> VM), there are multiple thread-local blocks allocated and they eventually end up on the free list.

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PR: https://git.openjdk.java.net/jdk/pull/7453