diff --git a/core/tool_manager.py b/core/tool_manager.py
index 2ad6f8c..a28bb5b 100644
--- a/core/tool_manager.py
+++ b/core/tool_manager.py
@@ -336,28 +336,33 @@ class ToolManager:
                                   "restart_count": tool.restart_count},
                                  source_module="tool_manager")
 
-                    # Crash callback (e.g., corrective ARP)
-                    if tool.crash_callback:
+                    # Call crash callback OUTSIDE lock to prevent deadlock
+                    callback = tool.crash_callback
+                    restart_needed = tool.restart_count < tool.max_restarts
+                    
+                    # Release lock before callback
+                    if callback:
                         try:
-                            tool.crash_callback()
+                            callback()
                         except Exception:
                             logger.exception("Crash callback failed for %s", tool.name)
-
-                    # Auto-restart with exponential backoff
-                    if tool.restart_count < tool.max_restarts:
-                        backoff = min(2 ** tool.restart_count, 30)
-                        logger.info("Restarting %s in %ds (attempt %d/%d)",
-                                    tool.name, backoff, tool.restart_count + 1,
-                                    tool.max_restarts)
-                        time.sleep(backoff)
-                        tool.restart_count += 1
-                        with self._lock:
+                    
+                    # Re-acquire lock for restart decision
+                    with self._lock:
+                        # Auto-restart with exponential backoff
+                        if tool.restart_count < tool.max_restarts:
+                            backoff = min(2 ** tool.restart_count, 30)
+                            logger.info("Restarting %s in %ds (attempt %d/%d)",
+                                        tool.name, backoff, tool.restart_count + 1,
+                                        tool.max_restarts)
+                            time.sleep(backoff)
+                            tool.restart_count += 1
                             self._start_tool(tool)
-                    else:
-                        logger.error("Tool %s exceeded max restarts (%d), giving up",
-                                     tool.name, tool.max_restarts)
-                        tool.process = None
-                        tool.pid = None
+                        else:
+                            logger.error("Tool %s exceeded max restarts (%d), giving up",
+                                         tool.name, tool.max_restarts)
+                            tool.process = None
+                            tool.pid = None
 
                 elif tool.health_check:
                     # Process alive — run health check