diff --git a/fix-unsigned-integer-subtraction-sign-overflow.patch b/fix-unsigned-integer-subtraction-sign-overflow.patch
new file mode 100644
index 0000000..e8d3969
--- /dev/null
+++ b/fix-unsigned-integer-subtraction-sign-overflow.patch
@@ -0,0 +1,26 @@
+From 2a66a666d3e202dec5b1a4309447e32d5f292871 Mon Sep 17 00:00:00 2001
+From: liuchao173 <55137861+liuchao173@users.noreply.github.com>
+Date: Tue, 24 Aug 2021 20:50:18 +0800
+Subject: [PATCH] fix unsigned integer subtraction sign overflow
+
+Min_load, adjustment_load  and load are unsigned integers, so it overflows when (lb_info->min_load + info->load) < (lb_info->adjustment_load - info->load). The result will be greater than zero. Therefore the irq cannot be selected to rebalanced.
+---
+ irqlist.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/irqlist.c b/irqlist.c
+index 9ab321a..4dd4a83 100644
+--- a/irqlist.c
++++ b/irqlist.c
+@@ -97,7 +97,7 @@ static void move_candidate_irqs(struct irq_info *info, void *data)
+ 	}
+ 
+ 	/* If we can migrate an irq without swapping the imbalance do it. */
+-	if ((lb_info->min_load + info->load) - (lb_info->adjustment_load - info->load) < delta_load) {
++	if ((lb_info->min_load + info->load) < delta_load + (lb_info->adjustment_load - info->load)) {
+ 		lb_info->adjustment_load -= info->load;
+ 		lb_info->min_load += info->load;
+ 		if (lb_info->min_load > lb_info->adjustment_load) {
+-- 
+1.8.3.1
+
diff --git a/irqbalance.spec b/irqbalance.spec
index 4e1e217..5ca6090 100644
--- a/irqbalance.spec
+++ b/irqbalance.spec
@@ -1,7 +1,7 @@
 Summary:        A dynamic adaptive IRQ balancing daemon
 Name:           irqbalance
 Version:        1.7.0
-Release:        3
+Release:        4
 Epoch:          3
 License:        GPLv2
 Source0:        https://github.com/Irqbalance/irqbalance/archive/irqbalance-%{version}.tar.gz
@@ -21,6 +21,8 @@ Requires: numactl-libs
 
 %define _hardened_build 1
 
+Patch6000: fix-unsigned-integer-subtraction-sign-overflow.patch
+
 %description
 Irqbalance is a daemon to help balance the cpu load generated by
 interrupts across all of a systems cpus. Irqbalance identifies the
@@ -77,6 +79,12 @@ fi
 /sbin/chkconfig --del %{name} >/dev/null 2>&1 || :
 
 %changelog
+* Wed Aug 25 2021 Liu Chao <liuchao173@huawei.com> - 3:1.7.0-4
+- Type:bugfix
+- ID:NA
+- SUG:restart
+- DESC:fix unsigned integer subtraction sign overflow
+
 * Mon May 10 2021 Liu Chao <liuchao173@huawei.com> - 3:1.7.0-3
 - Type:bugfix
 - ID:NA