[Kunlun]fix multi xpu dygraph hang, test=kunlun (#32662) (#32696)

paddle/fluid/imperative/reducer.cc

@@ -762,10 +762,11 @@ void Reducer::MarkGroupReady(size_t group_index) {
     // TODO(liuyuhui): Add try catch to deal with exception later,
     // otherwise the main thread will continue to run when an exception is
     // thrown in comm_pool_.
-    comm_pool_->enqueue([&] {
+    auto next_group = next_group_;
+    comm_pool_->enqueue([this, run_order, next_group, &group] {
       auto dev_id = BOOST_GET_CONST(platform::XPUPlace, place_).device;
       platform::SetXPUDeviceId(dev_id);
-      FusedAllReduceSchedule(run_order, group, next_group_);
+      FusedAllReduceSchedule(run_order, group, next_group);
       {
         std::lock_guard<std::mutex> lock(mutex_);
         comm_op_count_ -= 1;  // lock