From bb675afae6876fb99aaf0160298463008a9c5efa Mon Sep 17 00:00:00 2001
From: Joshua Cao <joshcao@amazon.com>
Date: Tue, 20 Feb 2024 08:54:48 +0000
Subject: [PATCH] 8325542: CTW: Runner can produce negative StressSeed

Reviewed-by: shade, xliu
---
 .../testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java b/test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java
index 45a0cdbfd81..b8332a5e5a5 100644
--- a/test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java
+++ b/test/hotspot/jtreg/testlibrary/ctw/src/sun/hotspot/tools/ctw/CtwRunner.java
@@ -38,6 +38,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Predicate;
+import java.util.Random;
 import java.util.regex.Pattern;
 import java.util.stream.Collectors;
 
@@ -266,7 +267,7 @@ public class CtwRunner {
     private String[] cmd(long classStart, long classStop) {
         String phase = phaseName(classStart);
         Path file = Paths.get(phase + ".cmd");
-        var rng = Utils.getRandomInstance();
+        Random rng = Utils.getRandomInstance();
 
         ArrayList<String> Args = new ArrayList<String>(Arrays.asList(
                 "-Xbatch",
@@ -301,7 +302,7 @@ public class CtwRunner {
                 "-XX:+StressMacroExpansion",
                 "-XX:+StressIncrementalInlining",
                 // StressSeed is uint
-                "-XX:StressSeed=" + Math.abs(rng.nextInt())));
+                "-XX:StressSeed=" + rng.nextInt(Integer.MAX_VALUE)));
 
         for (String arg : CTW_EXTRA_ARGS.split(",")) {
             Args.add(arg);