RFR: 8264393: JDK-8258284 introduced dangling TLH race [v3]

[Robbin Ehn]

On Sat, 3 Apr 2021 14:52:29 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

> Not sure how I missed this race earlier. I never originally intended for hazard pointers to be set when exiting nested ThreadsListHandles. Anyway - the problem is understood and the fix looks good.

I don't think you did, because originally we never intended them to be nested.
I still feel that the simple solution to nesting: pausing deletion on nesting, thus never changing the hazard pointer would be better (as in much simpler).
The only drawback is if there is a pathological case were we always have one thread with nested ThreadsLists (but hard to imagine).

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PR: https://git.openjdk.java.net/jdk/pull/3272