util: inspect: do not crash on an Error stack that contains a Symbol

See #56570

Author: ljharb

lib/internal/util/inspect.js

@@ -1285,8 +1285,14 @@ function identicalSequenceRange(a, b) {
   return { len: 0, offset: 0 };
 }
 
-function getStackString(error) {
-  return error.stack ? String(error.stack) : ErrorPrototypeToString(error);
+function getStackString(ctx, error) {
+  if (error.stack) {
+    if (ArrayIsArray(error.stack)) {
+      return formatArray(ctx, error.stack);
+    }
+    return String(error.stack);
+  }
+  return ErrorPrototypeToString(error);
 }
 
 function getStackFrames(ctx, err, stack) {
@@ -1301,7 +1307,7 @@ function getStackFrames(ctx, err, stack) {
 
   // Remove stack frames identical to frames in cause.
   if (cause != null && isError(cause)) {
-    const causeStack = getStackString(cause);
+    const causeStack = getStackString(ctx, cause);
     const causeStackStart = StringPrototypeIndexOf(causeStack, '\n    at');
     if (causeStackStart !== -1) {
       const causeFrames = StringPrototypeSplit(StringPrototypeSlice(causeStack, causeStackStart + 1), '\n');
@@ -1415,7 +1421,7 @@ function safeGetCWD() {
 
 function formatError(err, constructor, tag, ctx, keys) {
   const name = err.name != null ? String(err.name) : 'Error';
-  let stack = getStackString(err);
+  let stack = getStackString(ctx, err);
 
   removeDuplicateErrorKeys(ctx, keys, err, stack);
 

test/parallel/test-util-inspect.js

@@ -3426,3 +3426,13 @@ assert.strictEqual(
     Object.defineProperty(BuiltinPrototype, 'constructor', desc);
   }
 }
+
+{
+  const error = new Error();
+  error.stack = [Symbol('foo')];
+
+  assert.strictEqual(
+    inspect(error),
+    '[Symbol(foo)]'
+  );
+}