RFR: 8369505: jhsdb jstack cannot handle continuation stub

[Yasumasa Suenaga]

On Sat, 11 Oct 2025 05:09:31 GMT, Chris Plummer <cjplummer at openjdk.org> wrote:

>> I applied the changes to AARCH64Frame.java and they seem to fix the issue with the exception. I'm seeing two different stack traces (see below), and neither is identical to your fixed stack trace. I don't see `<StubRoutines (continuation stubs)>`. Instead I see a frame for `jdk.internal.vm.Continuation.enterSpecial()`. Also, I don't see `<StubRoutines (initial stubs)>` or any of the frames that come after it. Maybe these are just expected platform differences.
>> 
>> "ForkJoinPool-1-worker-5" #34 daemon prio=5 tid=0x0000000159051c10 nid=34819 runnable [0x0000000172761000]
>>    java.lang.Thread.State: RUNNABLE
>>    JavaThread state: _thread_in_native
>>  - java.lang.invoke.LambdaForm$MH+0x000003fe01047000.invoke(java.lang.Object, long, int) @bci=10 (Interpreted frame)
>>  - java.lang.invoke.LambdaForm$MH+0x000003fe01054800.invokeExact_MT(java.lang.Object, long, int, java.lang.Object) @bci=21 (Interpreted frame)
>>  - jdk.internal.foreign.abi.DowncallStub+0x000003fe01048000.invoke(java.lang.foreign.SegmentAllocator, java.lang.foreign.MemorySegment, int) @bci=44 (Interpreted frame)
>>  - java.lang.invoke.LambdaForm$DMH+0x000003fe01048400.invokeStaticInit(java.lang.Object, java.lang.Object, java.lang.Object, int) @bci=14 (Interpreted frame)
>>  - java.lang.invoke.LambdaForm$MH+0x000003fe0104f400.invoke(java.lang.Object, int) @bci=44 (Interpreted frame)
>>  - java.lang.invoke.LambdaForm$MH+0x000003fe0104e400.invoke_MT(java.lang.Object, int, java.lang.Object) @bci=18 (Interpreted frame)
>>  - Test.run() @bci=21, line=28 (Interpreted frame)
>>  - jdk.internal.vm.Continuation.enterSpecial(jdk.internal.vm.Continuation, boolean, boolean) @bci=0 (Compiled frame)
>>  - jdk.internal.vm.Continuation.run() @bci=152, line=251 (Interpreted frame)
>>  - java.lang.VirtualThread.runContinuation() @bci=100, line=293 (Interpreted frame)
>>  - java.lang.VirtualThread$$Lambda+0x000003fe01027670.run() @bci=4 (Interpreted frame)
>>  - java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute() @bci=4, line=1753 (Interpreted frame)
>>  - java.util.concurrent.ForkJoinTask$RunnableExecuteAction.compute() @bci=1, line=1745 (Interpreted frame)
>>  - java.util.concurrent.ForkJoinTask$InterruptibleTask.exec() @bci=51, line=1662 (Interpreted frame)
>>  - java.util.concurrent.ForkJoinTask.doExec() @bci=10, line=511 (Interpreted frame)
>>  - java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(java.util.concurrent.ForkJoinTask, int) @bci=5, line=1450 (Interpreted frame)
>>  - java.util.concurrent.F...
>
>> @plummercj Did you run `jhsdb jstack --mixed` ? StubRoutine would appear in mixed mode only I think (in Linux, at least).
> 
> I did not, and unfortunately --mixed is not support on OSX.

@plummercj Thanks for your comment! I revised testcase in the latest commit. Could you review again?

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PR Comment: https://git.openjdk.org/jdk/pull/27728#issuecomment-3399578469