Integrated: 8370176: Mixed mode jhsdb jstack cannot unwind call stack with -Xcomp

[Yasumasa Suenaga]

On Sun, 19 Oct 2025 06:16:56 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

> `jhsdb jstack --mixed` would not work when attaches to the process runs with `-Xcomp`.
> 
> It has been reported by @pchilano in #27728. You can reproduce the problem with [Test.java (attached JBS)](https://bugs.openjdk.org/secure/attachment/116551/Test.java). You can see following stack.
> 
> 
> ----------------- 646689 -----------------
> "Thread-0" #24 prio=5 tid=0x00007f1cec18c890 nid=646689 waiting on condition [0x00007f1cd0158000]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
>    JavaThread state: _thread_blocked
> 0x00007f1cf3b7f462 __syscall_cancel_arch + 0x32
> 0x00007f1cf3b7375c __internal_syscall_cancel + 0x5c
> 0x00007f1cf3b766a8 ___pthread_cond_timedwait + 0x178
> 0x00007f1cf270e1e9 PlatformEvent::park_nanos(long) + 0x119
> 0x00007f1cf2005f4c JavaThread::sleep_nanos(long) + 0xfc
> 0x00007f1cf218789f JVM_SleepNanos + 0x28f
> 0x00007f1cdb95f299 java.lang.Thread.sleepNanos0(long) + 0x99 (Native method)
> 
> 
> `Thread.sleepNanos0` is the bottom stack, but actually it has more call frames. You can see them with `-XX:+PreserveFramePointer`.
> 
> 
> ----------------- 646841 -----------------
> "Thread-0" #24 prio=5 tid=0x00007f4a0018c9e0 nid=646841 waiting on condition [0x00007f49e4fd7000]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
>    JavaThread state: _thread_blocked
> 0x00007f4a0aa29462 __syscall_cancel_arch + 0x32
> 0x00007f4a0aa1d75c __internal_syscall_cancel + 0x5c
> 0x00007f4a0aa206a8 ___pthread_cond_timedwait + 0x178
> 0x00007f4a0970e1e9 PlatformEvent::park_nanos(long) + 0x119
> 0x00007f4a09005f4c JavaThread::sleep_nanos(long) + 0xfc
> 0x00007f4a0918789f JVM_SleepNanos + 0x28f
> 0x00007f49ef961099 java.lang.Thread.sleepNanos0(long) + 0x99 (Native method)
> 0x00007f49e7f477b4 * java.lang.Thread.sleepNanos(long) bci:33 line:509 (Compiled frame)
> 0x00007f49e7f41a64 * java.lang.Thread.sleep(long) bci:25 line:540 (Compiled frame)
> 0x00007f49e7f4037c * Test.run() bci:3 line:6 (Compiled frame)
> 0x00007f49ef943328 * java.lang.Thread.runWith(java.lang.Object, java.lang.Runnable) bci:5 line:1487 (Compiled frame)
>                         * java.lang.Thread.run() bci:19 line:1474 (Compiled frame)
> 0x00007f49ef3385fd <StubRoutines (initial stubs)>
> 0x00007f4a08fc247e JavaCalls::call_helper(JavaValue*, methodHandle const&, JavaCallArguments*, JavaThread*) + 0x4ce
> 0x00007f4a08fc2bb3 JavaCalls::call_virtual(JavaValue*, Klass*, Symbol*, Symbol*, JavaCallArguments*, JavaThread*) + 0x2d3
> 0x00007f4a08fc31bb JavaCalls::call_virtual(JavaValue*, Handle, Klass*, Symbol*, Symbol*, JavaThread*) + 0xab
> 0x00007f4a091...

This pull request has now been integrated.

Changeset: 045018d5
Author:    Yasumasa Suenaga <ysuenaga at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/045018d5f39751af9f673974ff876c47596cdbd0
Stats:     248 lines in 6 files changed: 182 ins; 10 del; 56 mod

8370176: Mixed mode jhsdb jstack cannot unwind call stack with -Xcomp

Co-authored-by: Fei Yang <fyang at openjdk.org>
Reviewed-by: cjplummer, kevinw

-------------

PR: https://git.openjdk.org/jdk/pull/27885