This will hopefully cause the failure to happen reliably.
There is another random number generator in `upstream/emscripten/src/deterministic.js`
-which needs the same treatment:
-```
-var randomBuffer3 = new Uint8Array(2);
-crypto.getRandomValues(randomBuffer3);
+which needs the same treatment.
-var MAGIC = (randomBuffer3 [0] << 8) | randomBuffer3 [1];
-console.log ("SEED2: " + MAGIC);
-```
+Running `make patch-deterministic` in `src/mono/wasm` will patch the
+emscripten installation in `src/mono/wasm/emsdk` with these changes.
# Debugging signature mismatch errors
--- /dev/null
+diff --git a/src/deterministic.js b/src/deterministic.js
+index 0b894b4ac..05f50abba 100644
+--- a/src/deterministic.js
++++ b/src/deterministic.js
+@@ -4,7 +4,13 @@
+ * SPDX-License-Identifier: MIT
+ */
+
+-var MAGIC = 0;
++var randomBuffer3 = new Uint8Array(2);
++crypto.getRandomValues(randomBuffer3);
++
++var MAGIC = (randomBuffer3 [0] << 8) | randomBuffer3 [1];
++console.log ("SEED2: " + MAGIC);
++
++//var MAGIC = 0;
+ Math.random = () => {
+ MAGIC = Math.pow(MAGIC + 1.8912, 3) % 1;
+ return MAGIC;
+diff --git a/src/library.js b/src/library.js
+index 603f94dbf..698e9fe29 100644
+--- a/src/library.js
++++ b/src/library.js
+@@ -2196,6 +2196,17 @@ mergeInto(LibraryManager.library, {
+ // TODO: consider allowing the API to get a parameter for the number of
+ // bytes.
+ $getRandomDevice: function() {
++ var randomBuffer2 = new Uint8Array(2);
++ crypto.getRandomValues(randomBuffer2);
++
++ if (FS.seed2 == null)
++ FS.seed2 = (randomBuffer2 [0] << 8) | randomBuffer2 [1];
++ console.log('SEED: ' + FS.seed2);
++ return function() {
++ FS.seed2 = FS.seed2 * 16807 % 2147483647;
++ return FS.seed2;
++ };
++
+ if (typeof crypto == 'object' && typeof crypto['getRandomValues'] == 'function') {
+ // for modern web browsers
+ var randomBuffer = new Uint8Array(1);