question logic about ThreadUtil. getFullStacktrace(ThreadInfo threadInfo, double cpuUsage, long deltaTime, long time, int lockIdentityHashCode, int blockingThreadCount)

[oymy]

In arthas master branch. there is a logic that makes me confused in ThreadUtil. getFullStacktrace(ThreadInfo threadInfo, double cpuUsage, long deltaTime, long time, int lockIdentityHashCode, int blockingThreadCount)

for
 (StackTraceElement ste : threadInfo.getStackTrace()) {
            sb.append("\tat ").append(ste.toString());
            sb.append('\n');
            if (i == 0 && threadInfo.getLockInfo() != null) {
                Thread.State ts = threadInfo.getThreadState();
                switch (ts) {
                    case BLOCKED:
                        sb.append("\t-  blocked on ").append(threadInfo.getLockInfo());
                        sb.append('\n');
                        break;
                    case WAITING:
                        sb.append("\t-  waiting on ").append(threadInfo.getLockInfo());
                        sb.append('\n');
                        break;
                    case TIMED_WAITING:
                        sb.append("\t-  waiting on ").append(threadInfo.getLockInfo());
                        sb.append('\n');
                        break;
                    default:
                }
            }

            for (MonitorInfo mi : threadInfo.getLockedMonitors()) {
                if (mi.getLockedStackDepth() == i) {
                    sb.append("\t-  locked ").append(mi);
                    if (mi.getIdentityHashCode() == lockIdentityHashCode) {
                        Ansi highlighted = Ansi.ansi().fg(Ansi.Color.RED);
                        highlighted.a(" <---- but blocks ").a(blockingThreadCount).a(" other threads!");
                        sb.append(highlighted.reset().toString());
                    }
                    sb.append('\n');
                }
            }
            ++i;
        }
        if (i < threadInfo.getStackTrace().length) {

            sb.append("\t...");
            sb.append('\n');

        }

in the above codes, there is a for loop increasing i, then there is a test to check if i is smaller than threadInfo.getStackTrace().length.

my question is when will the test be true ?
is it possible that threadInfo.stackTrace can be changed by other thread?
how to reproduce it ?