From 5f6b31c23ff1eefdf3cd5807ce5f80abf24eb1b2 Mon Sep 17 00:00:00 2001
From: Sharon Rosner <sharon@noteflakes.com>
Date: Fri, 5 Dec 2025 06:20:39 +0100
Subject: Correctly handle `Process.fork` with an active `Fiber.scheduler`.
 (#15385)

In the child process, nullify the current fiber scheduler and set the current fiber to blocking.
---
 thread.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'thread.c')

diff --git a/thread.c b/thread.c
index 6e5c8e89ff..5f592a4256 100644
--- a/thread.c
+++ b/thread.c
@@ -4997,6 +4997,7 @@ rb_thread_atfork(void)
     rb_threadptr_pending_interrupt_clear(th);
     rb_thread_atfork_internal(th, terminate_atfork_i);
     th->join_list = NULL;
+    th->scheduler = Qnil;
     rb_fiber_atfork(th);
 
     /* We don't want reproduce CVE-2003-0900. */
-- 
cgit v1.2.3