RFR: 8271490: [ppc] [s390]: Crash in JavaThread::pd_get_top_frame_for_profiling

[Lutz Schmidt]

On Tue, 10 Aug 2021 14:50:34 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

> Please review this pull request. It hardens the code on ppc and s390 against crashes while collecting stack traces for JFR. Stack frame collection in prims/forte.cpp will benefit from this fix as well as it uses the same platform-specific code.
> 
> Testing:
> SAP-internal functional and stress testing. Verifying a positive effect is hard because the targeted crashes occur only very rarely. No negative side effects of the fix have been observed.

Thank you, Matthias, for reviewing and approving this fix. Will integrate now.

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PR: https://git.openjdk.java.net/jdk/pull/5071