RFR: 8369505: jhsdb jstack cannot handle continuation stub [v6]

[Yasumasa Suenaga]

On Mon, 13 Oct 2025 19:07:25 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> Yasumasa Suenaga has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Update testcase
>
> test/hotspot/jtreg/serviceability/sa/TestJhsdbJstackWithVirtualThread.java line 62:
> 
>> (failed to retrieve contents of file, check the PR for context)
> This check doesn't seem to be working. I disabled your fix and see the `must have non-zero frame size` exception in the log, but the test still passed. I think the exception is going to System.out.

I added test whether the message appears in output, and it works.

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PR Review Comment: https://git.openjdk.org/jdk/pull/27728#discussion_r2427649014