fix_bug_on_finalizer_of_main_thread-trunk.patch

diff --git a/gc.c b/gc.c
index 63869a0..e15f141 100644
--- a/gc.c
+++ b/gc.c
@@ -1420,9 +1420,11 @@ finalize_list(rb_objspace_t *objspace, RVALUE *p)
        RVALUE *tmp = p->as.free.next;
        run_final(objspace, (VALUE)p);
        if (!FL_TEST(p, FL_SINGLETON)) { /* not freeing page */
-            add_slot_local_freelist(objspace, p);
-            if (!is_lazy_sweeping(objspace)) {
-                gc_prof_dec_live_num(objspace);
+            if ((VALUE)p != rb_thread_main()) {
+                add_slot_local_freelist(objspace, p);
+                if (!is_lazy_sweeping(objspace)) {
+                    gc_prof_dec_live_num(objspace);
+                }
             }
        }
        else {
@@ -1458,7 +1460,8 @@ chain_finalized_object(st_data_t key, st_data_t val, st_data_t arg)
 {
     RVALUE *p = (RVALUE *)key, **final_list = (RVALUE **)arg;
     if ((p->as.basic.flags & FL_FINALIZE) == FL_FINALIZE &&
-        !MARKED_IN_BITMAP(GET_HEAP_BITMAP(p), p)) {
+        !MARKED_IN_BITMAP(GET_HEAP_BITMAP(p), p) &&
+        (VALUE)p != rb_thread_main()) {
        if (BUILTIN_TYPE(p) != T_ZOMBIE) {
            p->as.free.flags = T_ZOMBIE;
            RDATA(p)->dfree = 0;