RFR: 8245234: Still seeing missing mixed stack traces, even after JDK-8234624

[Kevin Walls]

On Sun, 5 Oct 2025 13:09:18 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> We haven't yet been able to unwind native frames in mixed mode jhsdb in some case even though we implement DWARF parser in [JDK-8234624](https://bugs.openjdk.org/browse/JDK-8234624). The cause is that `DwarfParser` would be reused.
> 
> DWARF is encoded as a state machine, so we have to initialize when we try to find new frame via DWARF. So I made change to create new `DwarfParser` instance everytime in `LinuxAMD64CFrame::sender`.

I think this looks good, makes sense, the native DwarfParser has its own context.  So the existing reuse of dwarf as nextDwarf at old line 150 might be unwise!

I see that getNextCFA, called down at new line 168, handles nextDwarf being null.

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Marked as reviewed by kevinw (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/27636#pullrequestreview-3303845340