https://git.ruby-lang.org/ruby.git/commit/?id=e052d07163

From e052d0716325bcb499c57b1de0c6e3eb9effb299 Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Wed, 23 Dec 2020 16:55:36 +0900
Subject: Revert "need to clear blocking cnt at fork (child process)"

This reverts commit 0dd4896175f95c4c2a26d91a97b9fcb9a74cc0c6.

It breaks the tests on RUBY_DEBUG=1.

diff --git a/thread.c b/thread.c
index 354ddd8..a7cd6e4 100644
--- a/thread.c
+++ b/thread.c
@@ -4743,10 +4743,9 @@ rb_thread_atfork_internal(rb_thread_t *th, void (*atfork)(rb_thread_t *, const r https://github.com/ruby/ruby/blob/trunk/thread.c#L4743
 
     // threads
     vm->ractor.cnt = 0;
-    vm->ractor.blocking_cnt = 0;
     rb_ractor_living_threads_init(th->ractor);
     rb_ractor_living_threads_insert(th->ractor, th);
-    rb_vm_ractor_blocking_cnt_dec(th->vm, th->ractor, __FILE__, __LINE__);
+
 
     /* may be held by MJIT threads in parent */
     rb_native_mutex_initialize(&vm->waitpid_lock);
-- 
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