diff -ur v2.4.25/linux/net/ipv4/ipvs/ip_vs_ctl.c linux/net/ipv4/ipvs/ip_vs_ctl.c
--- v2.4.25/linux/net/ipv4/ipvs/ip_vs_ctl.c	2003-11-28 22:04:14.000000000 +0200
+++ linux/net/ipv4/ipvs/ip_vs_ctl.c	2004-03-20 11:24:28.574545872 +0200
@@ -892,9 +892,13 @@
 
 	__ip_vs_update_dest(svc, dest, ur);
 
+	write_lock_bh(&__ip_vs_svc_lock);
+
 	/* call the update_service, because server weight may be changed */
 	svc->scheduler->update_service(svc);
 
+	write_unlock_bh(&__ip_vs_svc_lock);
+
 	LeaveFunction(2);
 
 	return 0;