From 8eea9a502031e866f210accc7d02347fc55f65c9 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@shopify.com>
Date: Mon, 1 Dec 2025 17:19:42 +1300
Subject: Nullify scheduler during `terminate_atfork_i`. (#15354)

---
 thread.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'thread.c')

diff --git a/thread.c b/thread.c
index f545a5377d..6e5c8e89ff 100644
--- a/thread.c
+++ b/thread.c
@@ -4979,6 +4979,9 @@ static void
 terminate_atfork_i(rb_thread_t *th, const rb_thread_t *current_th)
 {
     if (th != current_th) {
+        // Clear the scheduler as it is no longer operational:
+        th->scheduler = Qnil;
+
         rb_native_mutex_initialize(&th->interrupt_lock);
         rb_mutex_abandon_keeping_mutexes(th);
         rb_mutex_abandon_locking_mutex(th);
-- 
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