RFR: 8376264: Mixed jstack could not unwind optimized frame [v2]

Wed Jan 28 04:22:01 UTC 2026

On Mon, 26 Jan 2026 21:00:41 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

> Actually I see now it does still pass even when not skipped, but the output does contain the exception.

Yes.
New test (TestJhsdbJstackMixedCore.java) introduced in JDK-8374482 highlighted a problem at the function which does not have prologue (in context of calling convention) and its FDE is NOP only. It tends to happen on optimization by compiler. Thus it is different from JDK-8375477. 
We need to improve DWARF parser and stack unwinder like this PR.

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PR Comment: https://git.openjdk.org/jdk/pull/29398#issuecomment-3808862526