diff --git a/cuda_core/cuda/core/_device_resources.pxd b/cuda_core/cuda/core/_device_resources.pxd
index d618c24cf10..98f91ab4733 100644
--- a/cuda_core/cuda/core/_device_resources.pxd
+++ b/cuda_core/cuda/core/_device_resources.pxd
@@ -2,6 +2,8 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
+cimport cython
+
 from cuda.bindings cimport cydriver
 from cuda.core._resource_handles cimport ContextHandle, GreenCtxHandle
 
@@ -15,6 +17,7 @@ cdef class SMResource:
         unsigned int _flags
         bint _is_usable
         object __weakref__
+        cython.pymutex _split_mutex
 
     @staticmethod
     cdef SMResource _from_dev_resource(cydriver.CUdevResource res, int device_id)
diff --git a/cuda_core/cuda/core/_device_resources.pyx b/cuda_core/cuda/core/_device_resources.pyx
index ecd9e00bf05..bafc462c936 100644
--- a/cuda_core/cuda/core/_device_resources.pyx
+++ b/cuda_core/cuda/core/_device_resources.pyx
@@ -498,10 +498,11 @@ cdef class SMResource:
         )
         _resolve_group_count(opts)
         _check_green_ctx_support()
-        if _can_use_structured_sm_split():
-            return _split_with_general_api(self, opts, dry_run)
-        # SplitByCount requires the same 12.4+ as green ctx support (already checked above)
-        return _split_with_count_api(self, opts, dry_run)
+        with self._split_mutex:
+            if _can_use_structured_sm_split():
+                return _split_with_general_api(self, opts, dry_run)
+            # SplitByCount requires the same 12.4+ as green ctx support (already checked above)
+            return _split_with_count_api(self, opts, dry_run)
 
 
 cdef class WorkqueueResource:
diff --git a/cuda_core/cuda/core/graph/_graph_node.pyx b/cuda_core/cuda/core/graph/_graph_node.pyx
index 53145dd5e2a..d3d684aff3e 100644
--- a/cuda_core/cuda/core/graph/_graph_node.pyx
+++ b/cuda_core/cuda/core/graph/_graph_node.pyx
@@ -161,10 +161,11 @@ cdef class GraphNode:
         cdef cydriver.CUgraphNode node = as_cu(self._h_node)
         if node == NULL:
             return
-        with nogil:
-            HANDLE_RETURN(cydriver.cuGraphDestroyNode(node))
+
         _node_registry.pop(<uintptr_t>self._h_node.get(), None)
         invalidate_graph_node(self._h_node)
+        with nogil:
+            HANDLE_RETURN(cydriver.cuGraphDestroyNode(node))
 
     @property
     def pred(self) -> AdjacencySetProxy: