RFR: 8376284: New test serviceability/sa/TestJhsdbJstackMixedCore.java from JDK-8374482 fails on Linux Alpine [v3]

[Yasumasa Suenaga]

On Mon, 2 Feb 2026 19:43:05 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> test/hotspot/jtreg/serviceability/sa/TestJhsdbJstackMixedCore.java line 72:
>> 
>>> 70:         var libc = SATestUtils.getLibCPath();
>>> 71:         if (!SATestUtils.isSymbolAvailable(libc, "__restore_rt")) {
>>> 72:             throw new SkippedException("Signal trampoline (__restore_rt) not found in libc.");
>> 
>> I think you should clarify with a comment here that the presence of the __restore_rt trampoline is what triggers SA to generate the frame with the name "`<signal handler called>`", and if the __restore_rt symbol does not exist, then SA will not know to call the frame  "`<signal handler called>`".
>
> ...and maybe SA should generate the frame as "__restore_rt <signal handler called\>" or "__restore_rt <signal handler trampoline\>".

I updated to show `__restore_rt <signal trampoline>` for signal trampoline, and also I added comments for it.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29480#discussion_r2756571945