diff --git a/src/daemon/ticker.py b/src/daemon/ticker.py
index d8e927c..8c526c5 100644
--- a/src/daemon/ticker.py
+++ b/src/daemon/ticker.py
@@ -20,6 +20,7 @@ from typing import Any, Callable, Coroutine, Dict, List, Optional
 from src.blackboard.operations import Blackboard
 from src.blackboard.db import get_connection
 from src.blackboard.models import Task
+from src.daemon.spawner import AgentBusyError
 from src.blackboard.queries import Queries
 from src.blackboard.registry import ProjectRegistry
 
@@ -864,6 +865,18 @@ class Ticker:
             except (ValueError, TypeError):
                 pass
 
+        # v2.7.2: 进程存活性检查 — counter 占用但进程已死的光底
+        if self.spawner and self.counter:
+            for agent_id in list(self.counter.active_agents.keys()):
+                session_info = self.spawner.get_session_by_agent(agent_id)
+                if not session_info:
+                    continue
+                pid = session_info.get("pid")
+                if pid and not self._is_pid_alive(pid):
+                    logger.warning("Agent %s process dead (pid=%d), releasing counter",
+                                   agent_id, pid)
+                    self.counter.release(agent_id)
+
         return reclaimed
 
     def _mail_check_reply(self, original_task_id: str, db_path: Path) -> bool: