RFR: 8276125: RunThese24H.java SIGSEGV in JfrThreadGroup::thread_group_id

[Markus Grönlund]

On Fri, 3 Dec 2021 15:46:15 GMT, Markus Grönlund <mgronlun at openjdk.org> wrote:

> Greetings,
> 
> please help review this changeset.
> 
> Details are listed in the JIRA issue.
> 
> Testing: jdk_jfr
> 
> Thanks
> Markus

"Looks fine. Probably affects all releases, right? Even before Thread-SMR, the thread oop is not really guaranteed to be here?"

I don't really remember. This is old code, but the sightings started to appear in the last couple of months. Perhaps it is a combo of SMR thread lists AND the Access API coming together? The earlier API in javaClasses.inline.hpp handling null perhaps?

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PR: https://git.openjdk.java.net/jdk/pull/6702