RFR: 8276801: gc/stress/CriticalNativeStress.java fails intermittently with Shenandoah [v2]

[Aleksey Shipilev]

On Wed, 10 Nov 2021 02:11:00 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

>> What about `register_nmethod`? I see it is called from `nmethod::nmethod` that itself does `assert_locked_or_safepoint(CodeCache_lock)`. Is that path guaranteed to always hold the `CodeCache_lock`?
>
> I changed assert in `nmethod::nmethod()` to `assert_lock_strong(CodeCache_lock)` and ran tier1, no failure.
> 
> `nmethods` is installed by `CompilerThread` and `CompilerThread` is `JavaThread`, so I don't think it is possible to have `register_nmethod()` call at safepoints, because they have to participate in safepoints.

OK.

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PR: https://git.openjdk.java.net/jdk/pull/6316