diff --git a/packages/core/src/ground.js b/packages/core/src/ground.js
index 93a8f07..4e5db5f 100644
--- a/packages/core/src/ground.js
+++ b/packages/core/src/ground.js
@@ -104,6 +104,12 @@ function bootModule(mod) {
   if (typeof document !== 'undefined') {
     document.addEventListener("DOMContentLoaded", (e) => { g.start(); });
   } else {
+    process.on('SIGQUIT', () => {
+      console.log('---------------------------------------------------------------------------');
+      console.log(g.index.root._debugString());
+      console.log('ACTORS');
+      g.actors.forEach((a) => console.log('  ' + a.toString()));
+    });
     g.start();
   }
 }
diff --git a/packages/core/src/skeleton.js b/packages/core/src/skeleton.js
index db33f71..bdadbcd 100644
--- a/packages/core/src/skeleton.js
+++ b/packages/core/src/skeleton.js
@@ -279,7 +279,7 @@ Index.prototype.sendMessage = function(v) {
   });
 };
 
-Node.prototype._debugString = function () {
+Node.prototype._debugString = function (outerIndent) {
   const pieces = [];
   const inspect = require('util').inspect;
   function line(indent, content) {
@@ -325,8 +325,8 @@ Node.prototype._debugString = function () {
     walkCache(indent, h.cachedCaptures);
     line(indent, '' + h.callbacks.size + ' callback(s)');
   }
-  line('', 'INDEX ROOT');
-  walkNode('\n', this);
+  line(outerIndent || '', 'INDEX ROOT');
+  walkNode(outerIndent || '\n', this);
   return pieces.join('');
 };