[jdk22u] RFR: 8329528: G1 does not update TAMS correctly when dropping retained regions during Concurrent Start pause

[Albert Mingkun Yang]

On Tue, 16 Apr 2024 08:32:26 GMT, Thomas Schatzl <tschatzl at openjdk.org> wrote:

> Hi all,
> 
>   please review this backport for https://bugs.openjdk.org/browse/JDK-8329528; it applies cleanly apart from the hunk now in `inline void HeapRegion::note_start_of_marking()` - in jdk23 this method moved from there to concurrent marking code, although the change itself is the same.
> 
> This issue causes random crashes in G1. There is no workaround.
> 
> The change baked in jdk23 for a week or so, with no issues. Risk is little at this point as the patch is small and well understood, and there is a regression test.
> 
> Testing: gha, tier1-5

Marked as reviewed by ayang (no project role).

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PR Review: https://git.openjdk.org/jdk22u/pull/145#pullrequestreview-2005182137