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https://src.fedoraproject.org/rpms/nauty/raw/rawhide/f/nauty-uninitialized.patch

--- a/traces.c
+++ b/traces.c
@@ -10160,7 +10160,7 @@ struct trie *trie_make(trie *t, int valu
 
 struct trie *trie_new(int n, struct TracesVars* tv) {
     
-    TrieArray[0] = malloc(n*sizeof(trie));
+    TrieArray[0] = calloc(n, sizeof(trie));
     if (TrieArray[0] == NULL) {
         fprintf(ERRFILE, "\nError, memory not allocated.\n");
         exit(1);