RFR: 8318757: VM_ThreadDump asserts in interleaved ObjectMonitor::deflate_monitor calls [v10]

[Stefan Karlsson]

On Mon, 13 Nov 2023 09:00:31 GMT, Stefan Karlsson <stefank at openjdk.org> wrote:

>> A safepointed monitor deflation pass can run interleaved with a paused async monitor deflation pass. The code is not written to handle that situation and asserts when it finds a DEFLATER_MARKER in the owner field. @pchilano also found other issues with having to monitor deflation passes interleaved. More info below ...
>
> Stefan Karlsson has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Tweak test

So far I've been running tier1-7 (linux-x64 only) with LockingMode set to LM_LIGHTWEIGHT in globals.hpp. I'm currently running tier8.

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PR Comment: https://git.openjdk.org/jdk/pull/16519#issuecomment-1808895108