diff --git a/gunicorn/arbiter.py b/gunicorn/arbiter.py
index cd838d00..a007f9ef 100644
--- a/gunicorn/arbiter.py
+++ b/gunicorn/arbiter.py
@@ -686,11 +686,18 @@ class Arbiter:
                                    self.app, self.timeout / 2.0,
                                    self.cfg, self.log)
         self.cfg.pre_fork(self, worker)
+
+        # Stop control server before fork to prevent deadlocks.
+        # The asyncio thread holds locks that would be stuck in the child.
+        self._stop_control_server()
+
         pid = os.fork()
         if pid != 0:
             worker.pid = pid
             self.WORKERS[pid] = worker
             self._stats['workers_spawned'] += 1
+            # Restart control server in parent after fork
+            self._start_control_server()
             return pid
 
         # Do not inherit the temporary files of other workers
diff --git a/gunicorn/config.py b/gunicorn/config.py
index fa399f03..9fc4603b 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -3123,7 +3123,7 @@ class ControlSocket(Setting):
     cli = ["--control-socket"]
     meta = "PATH"
     validator = validate_string
-    default = "gunicorn.ctl"
+    default = "/tmp/gunicorn.ctl"
     desc = """\
         Unix socket path for control interface.
 
@@ -3131,8 +3131,8 @@ class ControlSocket(Setting):
         ``gunicornc`` command-line tool. Commands include viewing worker
         status, adjusting worker count, and graceful reload/shutdown.
 
-        By default, creates ``gunicorn.ctl`` in the working directory.
-        Set an absolute path for a fixed location (e.g., ``/var/run/gunicorn.ctl``).
+        By default, creates ``/tmp/gunicorn.ctl``. Set an absolute path for a
+        different location (e.g., ``/var/run/gunicorn.ctl``).
 
         Use ``--no-control-socket`` to disable.