[Bugfix] Avoid src/dst as None in irecv/isend_tensor_dict (#35754)

Signed-off-by: jiang1.li <jiang1.li@intel.com>

.buildkite/scripts/hardware_ci/run-cpu-distributed-smoke-test.sh

 #!/bin/bash
 set -euox pipefail
+export VLLM_CPU_CI_ENV=0
 
 echo "--- PP+TP"
 vllm serve meta-llama/Llama-3.2-3B-Instruct -tp=2 -pp=2 &
 server_pid=$!
-timeout 600 bash -c "until curl localhost:8000/v1/models; do sleep 1; done" || exit 1
+timeout 600 bash -c "until curl localhost:8000/v1/models > /dev/null 2>&1; do sleep 1; done" || exit 1
 vllm bench serve \
     --backend vllm \
     --dataset-name random \
     --model meta-llama/Llama-3.2-3B-Instruct \
     --num-prompts 20 \
+    --result-dir ./test_results \
+    --result-filename tp_pp.json \
+    --save-result \
     --endpoint /v1/completions
-kill -s SIGTERM $server_pid &
+kill -s SIGTERM $server_pid; wait $server_pid || true
+failed_req=$(jq '.failed' ./test_results/tp_pp.json)
+if [ "$failed_req" -ne 0 ]; then
+  echo "Some requests were failed!"
+  exit 1
+fi
 
 echo "--- DP+TP"
 vllm serve meta-llama/Llama-3.2-3B-Instruct -tp=2 -dp=2 &
 server_pid=$!
-timeout 600 bash -c "until curl localhost:8000/v1/models; do sleep 1; done" || exit 1
+timeout 600 bash -c "until curl localhost:8000/v1/models > /dev/null 2>&1; do sleep 1; done" || exit 1
 vllm bench serve \
     --backend vllm \
     --dataset-name random \
     --model meta-llama/Llama-3.2-3B-Instruct \
     --num-prompts 20 \
+    --result-dir ./test_results \
+    --result-filename dp_pp.json \
+    --save-result \
     --endpoint /v1/completions
-kill -s SIGTERM $server_pid &
+kill -s SIGTERM $server_pid; wait $server_pid || true
+failed_req=$(jq '.failed' ./test_results/dp_pp.json)
+if [ "$failed_req" -ne 0 ]; then
+  echo "Some requests were failed!"
+  exit 1
+fi

vllm/distributed/parallel_state.py

@@ -851,6 +851,10 @@ class GroupCoordinator:
         if self.world_size <= 1:
             return []
 
+        if dst is None:
+            dst = (self.rank_in_group + 1) % self.world_size
+        assert dst < self.world_size, f"Invalid dst rank ({dst})"
+
         if self.use_cpu_custom_send_recv:
             if self.device_communicator is None:
                 raise ValueError("No device communicator found")
@@ -868,10 +872,6 @@ class GroupCoordinator:
         group = self.device_group
         metadata_group = self.cpu_group
 
-        if dst is None:
-            dst = (self.rank_in_group + 1) % self.world_size
-        assert dst < self.world_size, f"Invalid dst rank ({dst})"
-
         metadata_list, tensor_list = _split_tensor_dict(tensor_dict)
         self.send_object(metadata_list, dst=dst)
 
@@ -948,6 +948,11 @@ class GroupCoordinator:
     ]:
         if not torch.distributed.is_initialized() or self.world_size == 1:
             return None, [], []
+
+        if src is None:
+            src = (self.rank_in_group - 1) % self.world_size
+        assert src < self.world_size, f"Invalid src rank ({src})"
+
         if self.use_cpu_custom_send_recv:
             if self.device_communicator is None:
                 raise ValueError("No device communicator found")
@@ -965,10 +970,6 @@ class GroupCoordinator:
         group = self.device_group
         metadata_group = self.cpu_group
 
-        if src is None:
-            src = (self.rank_in_group - 1) % self.world_size
-        assert src < self.world_size, f"Invalid src rank ({src})"
-
         recv_metadata_list = self.recv_object(src=src)
         tensor_dict: dict[str, Any] = {}
         handles: list[Handle] = []