From eab4a0bc8d883be2071a090c87914efc9c12d10c Mon Sep 17 00:00:00 2001
From: Erik Berlin <sferik@gmail.com>
Date: Fri, 27 Jun 2025 21:55:59 -0700
Subject: Fix race condition in signal handler query (#13712)

* Fix race condition in signal handler query

* Initialize signal lock dynamically and reset after fork

* Fix signal handler mutex initialization conditions
---
 thread.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'thread.c')

diff --git a/thread.c b/thread.c
index feb4419726..8442a7e786 100644
--- a/thread.c
+++ b/thread.c
@@ -4933,6 +4933,7 @@ rb_thread_atfork_internal(rb_thread_t *th, void (*atfork)(rb_thread_t *, const r
 
     thread_sched_atfork(TH_SCHED(th));
     ubf_list_atfork();
+    rb_signal_atfork();
 
     // OK. Only this thread accesses:
     ccan_list_for_each(&vm->ractor.set, r, vmlr_node) {
-- 
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