http: fix ClientRequest unhandled errors

lib/_http_client.js

@@ -801,13 +801,15 @@ function onSocketNT(req, socket, err) {
       req.emit('close');
     }
 
-    if (!err && req.agent) {
-      socket?.emit('free');
-    } else if (socket) {
-      finished(socket.destroy(err || req[kError]), (er) => {
-        _destroy(req, er || err);
-      });
-      return;
+    if (socket) {
+      if (!err && req.agent && !socket.destroyed) {
+        socket.emit('free');
+      } else {
+        finished(socket.destroy(err || req[kError]), (er) => {
+          _destroy(req, er || err);
+        });
+        return;
+      }
     }
 
     _destroy(req, err || req[kError]);

test/parallel/test-http-client-abort3.js

@@ -0,0 +1,32 @@
+'use strict';
+
+const common = require('../common');
+const http = require('http');
+const net = require('net');
+
+function createConnection() {
+  const socket = new net.Socket();
+
+  process.nextTick(function() {
+    socket.destroy(new Error('Oops'));
+  });
+
+  return socket;
+}
+
+{
+  const req = http.get({ createConnection });
+
+  req.on('error', common.expectsError({ name: 'Error', message: 'Oops' }));
+  req.abort();
+}
+
+{
+  class CustomAgent extends http.Agent {}
+  CustomAgent.prototype.createConnection = createConnection;
+
+  const req = http.get({ agent: new CustomAgent() });
+
+  req.on('error', common.expectsError({ name: 'Error', message: 'Oops' }));
+  req.abort();
+}