sync : ggml (#29396)

* ggml : bump version to 0.25.2 (ggml/1642)

* ggml : fix ubsan error in `ggml_graph_nbytes` (ggml/1644)

* ggml : bump version to 0.25.3 (ggml/1645)

* sync : ggml

ggml/CMakeLists.txt

@@ -5,7 +5,7 @@ project("ggml" C CXX ASM)
 ### GGML Version
 set(GGML_VERSION_MAJOR 0)
 set(GGML_VERSION_MINOR 25)
-set(GGML_VERSION_PATCH 1)
+set(GGML_VERSION_PATCH 3)
 set(GGML_VERSION_BASE "${GGML_VERSION_MAJOR}.${GGML_VERSION_MINOR}.${GGML_VERSION_PATCH}")
 
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/")

ggml/src/ggml.c

@@ -7450,7 +7450,7 @@ static void * incr_ptr_aligned(void ** p, size_t size, size_t align) {
 
 static size_t ggml_graph_nbytes(size_t size, bool grads) {
     size_t hash_size = ggml_hash_size(size * 2);
-    void * p = 0;
+    void * p = (char *) 1024; // workaround for ubsan error "applying non-zero offset X to null pointer"
     incr_ptr_aligned(&p, sizeof(struct ggml_cgraph), 1);
     incr_ptr_aligned(&p, size * sizeof(struct ggml_tensor *), sizeof(struct ggml_tensor *)); // nodes
     incr_ptr_aligned(&p, size * sizeof(struct ggml_tensor *), sizeof(struct ggml_tensor *)); // leafs
@@ -7463,7 +7463,7 @@ static size_t ggml_graph_nbytes(size_t size, bool grads) {
     incr_ptr_aligned(&p, ggml_bitset_size(hash_size) * sizeof(ggml_bitset_t), sizeof(ggml_bitset_t));
 
     size_t nbytes = (size_t) p;
-    return nbytes;
+    return nbytes - 1024;
 }
 
 size_t ggml_graph_overhead_custom(size_t size, bool grads) {

scripts/sync-ggml.last

@@ -1 +1 @@
-e565a8f4ce2e462c4973a24c51098dd3c81c0256
+353b63b439f27ab2cc19dac97ab1681ba6d2d084