ADDITIONAL SYSTEM INFORMATION :
# JRE version: OpenJDK Runtime Environment (27.0) (fastdebug build 27-internal-adhoc.user.jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 27-internal-adhoc.user.jdk, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)

A DESCRIPTION OF THE PROBLEM :
I am using a fastdebug build compiled from the latest JDK source code obtained from GitHub. I encountered this issue while running a very simple test case.I noticed that this specific assertion failure has been reported previously (JDK-8350971), but the test case triggering the failure in this instance appears to be different from the one documented in that report.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
javac Test.java && java Test


---------- BEGIN SOURCE ----------
class Test {
    long instanceCount;
    int var13;

    synchronized long foo(long var) {
        return 1;
    }

    void mainTest(String[] strArr1) {
        int i3;
        boolean b = false;
        for (int i4 = 0; i4 < 1000000; i4++) {
            i3 = Integer.valueOf((int) instanceCount);
            for (int i7 = 1; i7 < 4; i7++) {
                if (b)
                    continue;
                for (int i9 = 1; i9 < 2; i9++) {
                    int var14 = 0;
                    while (var14 < 20000) {
                        var13++;
                        var14++;
                    }
                    foo(instanceCount);
                    i3 = new MyInteger((int) (i9 + instanceCount)).value;
                }
            }
        }
    }

    void main(String[] strArr) {
        Test test = new Test();
        test.mainTest(strArr);
    }
}

class MyInteger {
    int value;

    MyInteger(int value) {
        this.value = value;
    }
}

---------- END SOURCE ----------