[jdk17] RFR: 8266889: [macosx-aarch64] Crash with SIGBUS in MarkActivationClosure::do_code_blob during vmTestbase/nsk/jvmti/.../bi04t002 test run

[Serguei Spitsyn]

On Mon, 12 Jul 2021 20:22:25 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

> The change adds W^X transition in RawMonitor family of functions, fixing the crash. RawMonitor functions are treated specially, so W^X transition is not inserted automatically. A better fix would be in .xml description for entries generation, but for now it is too risky. I hope to get this fixed in 17 in the simplest way and do re-work in the 18. This change is still 100% correct for the reported bug.
> 
> Verified by: 
> 
> jtreg -vmoption:-XX:+AssertWXAtThreadSync test/hotspot/jtreg/vmTestbase/nsk/jvmti/scenarios/bcinstr/BI04/bi04t002

Hi Anton,
At least, some comments would be nice to have explaining why the switches are needed there.
Thanks,
Serguei

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PR: https://git.openjdk.java.net/jdk17/pull/244