diff --git a/src/agents/session-write-lock.ts b/src/agents/session-write-lock.ts
index ca0b0c6f7d2..7ae9ae1c331 100644
--- a/src/agents/session-write-lock.ts
+++ b/src/agents/session-write-lock.ts
@@ -2,6 +2,7 @@ import fsSync from "node:fs";
 import fs from "node:fs/promises";
 import path from "node:path";
 import { isPidAlive } from "../shared/pid-alive.js";
+import { resolveProcessScopedMap } from "../shared/process-scoped-map.js";
 
 type LockFilePayload = {
   pid?: number;
@@ -49,17 +50,7 @@ type WatchdogState = {
   timer?: NodeJS.Timeout;
 };
 
-function resolveHeldLocks(): Map<string, HeldLock> {
-  const proc = process as NodeJS.Process & {
-    [HELD_LOCKS_KEY]?: Map<string, HeldLock>;
-  };
-  if (!proc[HELD_LOCKS_KEY]) {
-    proc[HELD_LOCKS_KEY] = new Map<string, HeldLock>();
-  }
-  return proc[HELD_LOCKS_KEY];
-}
-
-const HELD_LOCKS = resolveHeldLocks();
+const HELD_LOCKS = resolveProcessScopedMap<HeldLock>(HELD_LOCKS_KEY);
 
 function resolveCleanupState(): CleanupState {
   const proc = process as NodeJS.Process & {
diff --git a/src/plugin-sdk/file-lock.ts b/src/plugin-sdk/file-lock.ts
index 9bbf2e5b6c9..98277381868 100644
--- a/src/plugin-sdk/file-lock.ts
+++ b/src/plugin-sdk/file-lock.ts
@@ -1,6 +1,7 @@
 import fs from "node:fs/promises";
 import path from "node:path";
 import { isPidAlive } from "../shared/pid-alive.js";
+import { resolveProcessScopedMap } from "../shared/process-scoped-map.js";
 
 export type FileLockOptions = {
   retries: {
@@ -25,18 +26,7 @@ type HeldLock = {
 };
 
 const HELD_LOCKS_KEY = Symbol.for("openclaw.fileLockHeldLocks");
-
-function resolveHeldLocks(): Map<string, HeldLock> {
-  const proc = process as NodeJS.Process & {
-    [HELD_LOCKS_KEY]?: Map<string, HeldLock>;
-  };
-  if (!proc[HELD_LOCKS_KEY]) {
-    proc[HELD_LOCKS_KEY] = new Map<string, HeldLock>();
-  }
-  return proc[HELD_LOCKS_KEY];
-}
-
-const HELD_LOCKS = resolveHeldLocks();
+const HELD_LOCKS = resolveProcessScopedMap<HeldLock>(HELD_LOCKS_KEY);
 
 function computeDelayMs(retries: FileLockOptions["retries"], attempt: number): number {
   const base = Math.min(
diff --git a/src/shared/process-scoped-map.ts b/src/shared/process-scoped-map.ts
new file mode 100644
index 00000000000..8235ba66a10
--- /dev/null
+++ b/src/shared/process-scoped-map.ts
@@ -0,0 +1,12 @@
+export function resolveProcessScopedMap<T>(key: symbol): Map<string, T> {
+  const proc = process as NodeJS.Process & {
+    [symbolKey: symbol]: Map<string, T> | undefined;
+  };
+  const existing = proc[key];
+  if (existing) {
+    return existing;
+  }
+  const created = new Map<string, T>();
+  proc[key] = created;
+  return created;
+}