https://git.ruby-lang.org/ruby.git/commit/?id=dd5db6f5fe

From dd5db6f5fed359efc85cff25d326b5fc3de66614 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 16 Sep 2020 09:04:13 +0900
Subject: sync fstring_table for deletion

Ractors can access this table simultaneously so we need to sync
accesses.

diff --git a/string.c b/string.c
index 8de906b..1377ea3 100644
--- a/string.c
+++ b/string.c
@@ -1378,8 +1378,13 @@ rb_str_free(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L1378
 {
     if (FL_TEST(str, RSTRING_FSTR)) {
 	st_data_t fstr = (st_data_t)str;
-	st_delete(rb_vm_fstring_table(), &fstr, NULL);
-	RB_DEBUG_COUNTER_INC(obj_str_fstr);
+
+        RB_VM_LOCK_ENTER();
+        {
+            st_delete(rb_vm_fstring_table(), &fstr, NULL);
+            RB_DEBUG_COUNTER_INC(obj_str_fstr);
+        }
+        RB_VM_LOCK_LEAVE();
     }
 
     if (STR_EMBED_P(str)) {
-- 
cgit v0.10.2


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