From 159cea0bba2ea0ed30c9e7c122e0855153903c01 Mon Sep 17 00:00:00 2001
From: Howard Chu <hyc@openldap.org>
Date: Thu, 18 Dec 2025 15:32:28 +0000
Subject: [PATCH] ITS#10258 daemon/epoll: fix check for active socket

Lock sd_mutex before checking
---
 servers/slapd/daemon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/servers/slapd/daemon.c b/servers/slapd/daemon.c
index 617a2f3946..e7559ca2ff 100644
--- a/servers/slapd/daemon.c
+++ b/servers/slapd/daemon.c
@@ -3115,9 +3115,11 @@ loop:
 #ifdef HAVE_EPOLL
 					/* Don't keep reporting the hangup
 					 */
+					ldap_pvt_thread_mutex_lock( &slap_daemon[tid].sd_mutex );
 					if ( SLAP_SOCK_IS_ACTIVE( tid, fd )) {
 						SLAP_EPOLL_SOCK_SET( tid, fd, EPOLLET );
 					}
+					ldap_pvt_thread_mutex_unlock( &slap_daemon[tid].sd_mutex );
 #endif
 				}
 			}