--- old/src/java.base/share/classes/java/util/ImmutableCollections.java	2020-04-26 22:07:13.624304664 -0700
+++ new/src/java.base/share/classes/java/util/ImmutableCollections.java	2020-04-26 22:07:13.496299845 -0700
@@ -64,14 +64,22 @@
     private static final boolean REVERSE;
     static {
         // to generate a reasonably random and well-mixed SALT, use an arbitrary
-        // value (a slice of pi), multiply with the System.nanoTime, then pick
+        // value (a slice of pi), multiply with a random seed, then pick
         // the mid 32-bits from the product. By picking a SALT value in the
         // [0 ... 0xFFFF_FFFFL == 2^32-1] range, we ensure that for any positive
         // int N, (SALT32L * N) >> 32 is a number in the [0 ... N-1] range. This
         // property will be used to avoid more expensive modulo-based
         // calculations.
         long color = 0x243F_6A88_85A3_08D3L; // slice of pi
-        long seed = System.nanoTime();
+
+        // When running with -Xshare:dump, the VM will supply a "random" seed that's
+        // derived from the JVM build/version, so can we generate the exact same
+        // CDS archive for the same JDK build. This makes it possible to verify the
+        // consistency of the JDK build.
+        long seed = VM.getRandomSeedForCDSDump();
+        if (seed == 0) {
+          seed = System.nanoTime();
+        }
         SALT32L = (int)((color * seed) >> 16) & 0xFFFF_FFFFL;
         // use the lowest bit to determine if we should reverse iteration
         REVERSE = (SALT32L & 1) == 0;