Created attachment 156935 [details]
gdb log

I have a very simple java program with JNI:
(native part is trivial, just generated it and added "return 123";)

public class JavaApplication3 {
    private native int caclculate();    
    public static void main(String[] args) {        
        System.loadLibrary("CppJNILibrary_3");        
        int res = new JavaApplication3().caclculate(); // step into
        System.out.println("res = " + res);
    }    
}

When I step into JavaApplication3().caclculate(), debugging view shows 27 threads - which is correct (at least "info threads" gives me the same amount).

But when I expand each thread, it shows the same stack:
Java_javaapplication3_JavaApplication3_caclculate (env=0x7fa5d0013000, object=0x8)
?? ()
?? ()
?? ()
?? ()
?? ()
?? ()
?? ()
?? ()