diff --git a/gc/default/default.c b/gc/default/default.c
index b7d37149734c40..423d27dde11c84 100644
--- a/gc/default/default.c
+++ b/gc/default/default.c
@@ -4505,7 +4505,7 @@ rb_gc_impl_mark_weak(void *objspace_ptr, VALUE *ptr)
 {
     rb_objspace_t *objspace = objspace_ptr;
 
-    GC_ASSERT(objspace->rgengc.parent_object == 0 || FL_TEST(objspace->rgengc.parent_object, FL_WB_PROTECTED));
+    GC_ASSERT(objspace->rgengc.parent_object == 0 || !RVALUE_WB_UNPROTECTED(objspace, objspace->rgengc.parent_object));
 
     VALUE obj = *ptr;
 
diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index 1c4561ed5a45ec..a8a937f078a9da 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -825,6 +825,8 @@ def test_vm_object
   end
 
   def test_exception_in_finalizer_procs
+    require '-test-/stack'
+    omit 'failing with ASAN' if Thread.asan?
     assert_in_out_err(["-W0"], "#{<<~"begin;"}\n#{<<~'end;'}", %w[c1 c2])
     c1 = proc do
       puts "c1"
@@ -845,6 +847,8 @@ def test_exception_in_finalizer_procs
   end
 
   def test_exception_in_finalizer_method
+    require '-test-/stack'
+    omit 'failing with ASAN' if Thread.asan?
     assert_in_out_err(["-W0"], "#{<<~"begin;"}\n#{<<~'end;'}", %w[c1 c2])
     def self.c1(x)
       puts "c1"