https://git.ruby-lang.org/ruby.git/commit/?id=969b824a0c

From 969b824a0c7605e0e570631d967ad0de0c37d0bf Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Thu, 18 Feb 2021 15:47:32 +0900
Subject: sync GC rest if needed

marking requires a barrier (stop all Ractors) and gc_enter() does it.
However, it doesn't check rest event which can start marking.
[Bug #17599]
---
 gc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gc.c b/gc.c
index 63a2268..33d4632 100644
--- a/gc.c
+++ b/gc.c
@@ -8477,6 +8477,9 @@ gc_enter(rb_objspace_t *objspace, enum gc_enter_event event, unsigned int *lock_ https://github.com/ruby/ruby/blob/trunk/gc.c#L8477
     RB_VM_LOCK_ENTER_LEV(lock_lev);
 
     switch (event) {
+      case gc_enter_event_rest:
+        if (!is_marking(objspace)) break;
+        // fall through
       case gc_enter_event_start:
       case gc_enter_event_mark_continue:
         // stop other ractors
-- 
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