Fix core dumps in ExitActor (#8382)

src/ray/core_worker/core_worker.cc

@@ -1917,7 +1917,10 @@ void CoreWorker::HandleCancelTask(const rpc::CancelTaskRequest &request,
     if (options_.log_dir != "") {
       RayLog::ShutDownRayLog();
     }
-    exit(1);
+    // NOTE(hchen): Use `_Exit()` to force-exit this process without doing cleanup.
+    // `exit()` will destruct static objects in an incorrect order, which will lead to
+    // core dumps.
+    _Exit(1);
   }
 }
 
@@ -1953,7 +1956,10 @@ void CoreWorker::HandleKillActor(const rpc::KillActorRequest &request,
     if (options_.log_dir != "") {
       RayLog::ShutDownRayLog();
     }
-    exit(1);
+    // NOTE(hchen): Use `_Exit()` to force-exit this process without doing cleanup.
+    // `exit()` will destruct static objects in an incorrect order, which will lead to
+    // core dumps.
+    _Exit(1);
   } else {
     Exit(/*intentional=*/true);
   }