https://git.ruby-lang.org/ruby.git/commit/?id=9636d14f6f

From 9636d14f6f4a1dc21ca61c280b26ec8fb3935168 Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Wed, 23 Dec 2020 00:51:26 +0900
Subject: [memory_view] Acquire VM lock while running
 exported_object_registry_free

exported_object_registry is freed at exit, so this change is just in case.

diff --git a/memory_view.c b/memory_view.c
index 2d4f9dc..a1ab240 100644
--- a/memory_view.c
+++ b/memory_view.c
@@ -51,11 +51,11 @@ exported_object_registry_mark(void *ptr) https://github.com/ruby/ruby/blob/trunk/memory_view.c#L51
 static void
 exported_object_registry_free(void *ptr)
 {
-    // Note that calling RB_VM_LOCK_ENTER here is unnecessary now.
-    // But it may be changed in the future.
+    RB_VM_LOCK_ENTER();
     st_clear(exported_object_table);
     st_free_table(exported_object_table);
     exported_object_table = NULL;
+    RB_VM_LOCK_LEAVE();
 }
 
 const rb_data_type_t rb_memory_view_exported_object_registry_data_type = {
-- 
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