RFR: 8374469: Mixed jstack does not work on Windows [v2]

Chris Plummer cjplummer at openjdk.org
Thu Jan 15 01:33:35 UTC 2026 

On Thu, 15 Jan 2026 00:49:59 GMT, Yasumasa Suenaga <ysuenaga at openjdk.org> wrote:

>> On windows-x64 I'm seeing about 25 NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI frames. On other platforms I see just one Java_LingeredAppWithNativeMethod_callJNI frame, and a couple of fib() frames above it. Maybe this difference is just native compiler inlining and tail call elimination, but wanted to point it out just to make sure it is correct.
>
> On my Windows 11 25H2, mixed jstack works correctly like following:
> 
>   <snip>
> 
> 0x00007ff8105c10c4      NoFramePointer!fib + 0x28
> 0x00007ff8105c10c4      NoFramePointer!fib + 0x28
> 0x00007ff8105c101d      NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0x1d
> 0x000001c5903afbf8      * LingeredAppWithNativeMethod.callJNI(java.lang.Object, int) bci:0 (Interpreted frame)
>                         * LingeredAppWithNativeMethod.callNative() bci:47 line:54 (Interpreted frame)
>                         * LingeredAppWithNativeMethod.callback(long) bci:8 line:63 (Interpreted frame)
> 
>   <snip>
> 
> 
> Do you mean multiple jstacks are shown in .jtr file with message such as "DEBUG: Iteration: 1 - Test didn't trigger interesting condition." ? If yes, I think it is expected.
> 
> TestJhsdbJstackMixed.java seems to check at `isFibAndAlignedAddress` whether instruction address (PC) is aligned or not. I saw the condition is met in early on Linux x64, but it seems to take some calls on Windows x64. I'm not sure why we need to check this (I checked [JDK-8208091](https://bugs.openjdk.org/browse/JDK-8208091) which introduced it, but I haven't yet understood the reason).

"NoFramePointerJNIFib" #28 prio=5 tid=0x0000023fa4432290 nid=20612 runnable [0x000000d0370fe000]
   java.lang.Thread.State: RUNNABLE
   JavaThread state: _thread_in_native
0x00007ffbe5fd10a8	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xa8
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10db	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xdb
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd10d0	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0xd0
0x00007ffbe5fd101d	NoFramePointer!Java_LingeredAppWithNativeMethod_callJNI + 0x1d
0x0000023f9300fcf8	* LingeredAppWithNativeMethod.callJNI(java.lang.Object, int) bci:0 (Interpreted frame)
                  	* LingeredAppWithNativeMethod.callNative() bci:47 line:54 (Interpreted frame)
                  	* LingeredAppWithNativeMethod.callback(long) bci:8 line:63 (Interpreted frame)
0x0000023f93001952	<StubRoutines (initial stubs)>
0x0000023f93009300	* LingeredAppWithNativeMethod.callNative() bci:47 line:54 (Interpreted frame)
                  	* LingeredAppWithNativeMethod.callback(long) bci:8 line:63 (Interpreted frame)
0x0000023f93001952	<StubRoutines (initial stubs)>
0x0000023f93009300	* LingeredAppWithNativeMethod.callNative() bci:47 line:54 (Interpreted frame)
                  	* LingeredAppWithNativeMethod.lambda$main$0(LingeredAppWithNativeMethod) bci:1 line:71 (Interpreted frame)
                  	* LingeredAppWithNativeMethod$$Lambda+0x000000002b040b00.run() bci:4 (Interpreted frame)
                  	* java.lang.Thread.runWith(java.lang.Object, java.lang.Runnable) bci:5 line:1529 (Interpreted frame)
                  	* java.lang.Thread.run() bci:19 line:1516 (Interpreted frame)
0x0000023f93001952	<StubRoutines (initial stubs)>
0x00007ffbc6d047c8	jvm!JavaCalls::call_helper + 0x3f8
0x00007ffbc72189ec	jvm!os::os_exception_wrapper + 0x2c
0x00007ffbc6d05773	jvm!JavaCalls::call_virtual + 0x223
0x00007ffbc6d05b53	jvm!JavaCalls::call_virtual + 0x93
0x00007ffbc6e2f192	jvm!thread_entry + 0x82
0x00007ffbc6d3dce1	jvm!JavaThread::thread_main_inner + 0x261
0x00007ffbc747f15e	jvm!Thread::call_run + 0x1be
0x00007ffbc7216ec4	jvm!thread_native_entry + 0xc4
0x00007ffbee504ea0	ucrtbase!wcsrchr + 0x1f0
0x00007ffbf03ddbe7	KERNEL32!BaseThreadInitThunk + 0x17
0x00007ffbf1165a6c	ntdll!RtlUserThreadStart + 0x2c

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

PR Review Comment: https://git.openjdk.org/jdk/pull/29019#discussion_r2692626234

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