--- /dev/null
+#include <stdio.h>
+#define GC_DEBUG
+#include "gc.h"
+
+struct treenode {
+ struct treenode *x;
+ struct treenode *y;
+} * root[10];
+
+struct treenode * mktree(int i) {
+ struct treenode * r = GC_MALLOC(sizeof(struct treenode));
+ if (0 == i) return 0;
+ if (1 == i) r = GC_MALLOC_ATOMIC(sizeof(struct treenode));
+ r -> x = mktree(i-1);
+ r -> y = mktree(i-1);
+ return r;
+}
+
+main()
+{
+ int i;
+ for (i = 0; i < 10; ++i) {
+ root[i] = mktree(12);
+ }
+ GC_generate_random_backtrace();
+ GC_generate_random_backtrace();
+ GC_generate_random_backtrace();
+ GC_generate_random_backtrace();
+}