RFR: 8350605: assert(!heap->is_uncommit_in_progress()) failed: Cannot uncommit bitmaps while resetting them [v3]

[William Kemper]

On Fri, 28 Feb 2025 17:44:36 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> The protocol which is meant to prevent regions from being uncommitted while their bitmaps are being reset may fail. This happens when the control thread attempts to wait for the uncommit thread to finish, but the uncommit thread has not yet indicated that it has started.
>> 
>> ## Testing
>> GHA, Dacapo, Extremem, Heapothesys, Diluvian, SpecJBB2015, SpecJVM2008 (with and without stress flags, asserts). Also have run the JTREG test that failed this assertion over 10K times (and counting).
>
> William Kemper has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Comment tweak

Tests with uncommit behavior enabled look good.

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PR Comment: https://git.openjdk.org/jdk/pull/23760#issuecomment-2695210222