diff --git a/src/main/java/dev/modzuozhi/core/compat/DistanceManagerLock.java b/src/main/java/dev/modzuozhi/core/compat/DistanceManagerLock.java
new file mode 100644
index 0000000..9a6237d
--- /dev/null
+++ b/src/main/java/dev/modzuozhi/core/compat/DistanceManagerLock.java
@@ -0,0 +1,22 @@
+package dev.modzuozhi.core.compat;
+
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * DistanceManager ticket 表的共享锁。
+ * <p>
+ * DR 让维度 tick 跑在独立线程后，多个线程会并发修改 {@code DistanceManager.tickets}
+ * （{@code Long2ObjectOpenHashMap}，非线程安全）。{@link dev.modzuozhi.mixin.DistanceManagerMixin}
+ * 用它串行化所有 ticket 写路径。
+ * <p>
+ * <b>跨 mod 可见性</b>：ServerWarashi 的 {@code TicketScanService} 在主线程遍历同一张 ticket 表
+ * （性能采样归属快照），若不持同一把锁，遍历会与维度线程的写并发 → fastutil fail-fast 迭代器
+ * NPE。因此本锁<b>公开</b>，warashi 通过反射获取并共用，实现「读-写互斥」。
+ */
+public final class DistanceManagerLock {
+    /** 所有 DistanceManager ticket 读/写路径共用的锁。 */
+    public static final ReentrantLock LOCK = new ReentrantLock();
+
+    private DistanceManagerLock() {
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/dev/modzuozhi/mixin/DistanceManagerMixin.java b/src/main/java/dev/modzuozhi/mixin/DistanceManagerMixin.java
index 68c96f5..c7b9b5a 100644
--- a/src/main/java/dev/modzuozhi/mixin/DistanceManagerMixin.java
+++ b/src/main/java/dev/modzuozhi/mixin/DistanceManagerMixin.java
@@ -10,8 +10,7 @@ import net.minecraft.server.level.Ticket;
 import net.minecraft.world.level.ChunkPos;
 import org.spongepowered.asm.mixin.Mixin;
 
-import java.util.concurrent.locks.ReentrantLock;
-
+import dev.modzuozhi.core.compat.DistanceManagerLock;
 /**
  * {@code DistanceManager}（区块 ticket 调度）并发保护。
  * <p>
@@ -26,7 +25,7 @@ import java.util.concurrent.locks.ReentrantLock;
  */
 @Mixin(DistanceManager.class)
 public class DistanceManagerMixin {
-    private static final ReentrantLock LOCK = new ReentrantLock();
+    private static final java.util.concurrent.locks.ReentrantLock LOCK = DistanceManagerLock.LOCK;
 
     @WrapMethod(method = "addTicket")
     private void modzuozhi_lockAddTicket(long chunkPos, Ticket<?> ticket, Operation<Void> original) {