diff --git a/pkg/controller/exporter.go b/pkg/controller/exporter.go
index 1e599459c20..1e86d8a395a 100644
--- a/pkg/controller/exporter.go
+++ b/pkg/controller/exporter.go
@@ -95,6 +95,9 @@ func (c *Controller) exportSubnetIPAMInfo(subnet *kubeovnv1.Subnet) {
 		return
 	}
 
+	ipamSubnet.Mutex.RLock()
+	defer ipamSubnet.Mutex.RUnlock()
+
 	switch subnet.Spec.Protocol {
 	case kubeovnv1.ProtocolIPv4:
 		metricSubnetIPAMInfo.WithLabelValues(subnet.Name, subnet.Spec.CIDRBlock, ipamSubnet.V4Free.String(), ipamSubnet.V4Reserved.String(), ipamSubnet.V4Available.String(), ipamSubnet.V4Using.String()).Set(1)
@@ -115,6 +118,9 @@ func (c *Controller) exportSubnetIPAssignedInfo(subnet *kubeovnv1.Subnet) {
 		return
 	}
 
+	ipamSubnet.Mutex.RLock()
+	defer ipamSubnet.Mutex.RUnlock()
+
 	if subnet.Spec.Protocol == kubeovnv1.ProtocolIPv4 || subnet.Spec.Protocol == kubeovnv1.ProtocolDual {
 		for ip, pod := range ipamSubnet.V4IPToPod {
 			metricSubnetIPAssignedInfo.WithLabelValues(subnet.Name, ip, pod).Set(1)
diff --git a/pkg/ipam/ipam.go b/pkg/ipam/ipam.go
index e202049403a..b3c63c8d160 100644
--- a/pkg/ipam/ipam.go
+++ b/pkg/ipam/ipam.go
@@ -325,7 +325,7 @@ func (ipam *IPAM) GetPodAddress(podName string) []*SubnetAddress {
 	defer ipam.mutex.RUnlock()
 	addresses := []*SubnetAddress{}
 	for _, subnet := range ipam.Subnets {
-		subnet.mutex.RLock()
+		subnet.Mutex.RLock()
 		for _, nicName := range subnet.PodToNicList[podName] {
 			v4IP, v6IP, mac, protocol := subnet.GetPodAddress(podName, nicName)
 			switch protocol {
@@ -338,7 +338,7 @@ func (ipam *IPAM) GetPodAddress(podName string) []*SubnetAddress {
 				addresses = append(addresses, &SubnetAddress{Subnet: subnet, IP: v6IP.String(), Mac: mac})
 			}
 		}
-		subnet.mutex.RUnlock()
+		subnet.Mutex.RUnlock()
 	}
 	return addresses
 }
diff --git a/pkg/ipam/subnet.go b/pkg/ipam/subnet.go
index 920c69bf24e..983e6ebdc7b 100644
--- a/pkg/ipam/subnet.go
+++ b/pkg/ipam/subnet.go
@@ -15,7 +15,7 @@ import (
 
 type Subnet struct {
 	Name         string
-	mutex        sync.RWMutex
+	Mutex        sync.RWMutex
 	CIDR         string
 	Protocol     string
 	V4CIDR       *net.IPNet
@@ -172,10 +172,10 @@ func (s *Subnet) popPodNic(podName, nicName string) {
 }
 
 func (s *Subnet) GetRandomAddress(poolName, podName, nicName string, mac *string, skippedAddrs []string, checkConflict bool) (IP, IP, string, error) {
-	s.mutex.Lock()
+	s.Mutex.Lock()
 	defer func() {
 		s.pushPodNic(podName, nicName)
-		s.mutex.Unlock()
+		s.Mutex.Unlock()
 	}()
 
 	switch s.Protocol {
@@ -317,8 +317,8 @@ func (s *Subnet) getV6RandomAddress(ippoolName, podName, nicName string, mac *st
 func (s *Subnet) GetStaticAddress(podName, nicName string, ip IP, mac *string, force, checkConflict bool) (IP, string, error) {
 	var v4, v6 bool
 	isAllocated := false
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
+	s.Mutex.Lock()
+	defer s.Mutex.Unlock()
 
 	if ip.To4() != nil {
 		v4 = s.V4CIDR != nil
@@ -543,8 +543,8 @@ func (s *Subnet) releaseAddr(podName, nicName string) {
 }
 
 func (s *Subnet) ReleaseAddress(podName string) {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
+	s.Mutex.Lock()
+	defer s.Mutex.Unlock()
 	for _, nicName := range s.PodToNicList[podName] {
 		s.releaseAddr(podName, nicName)
 		s.popPodNic(podName, nicName)
@@ -552,16 +552,16 @@ func (s *Subnet) ReleaseAddress(podName string) {
 }
 
 func (s *Subnet) ReleaseAddressWithNicName(podName, nicName string) {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
+	s.Mutex.Lock()
+	defer s.Mutex.Unlock()
 
 	s.releaseAddr(podName, nicName)
 	s.popPodNic(podName, nicName)
 }
 
 func (s *Subnet) ContainAddress(address IP) bool {
-	s.mutex.RLock()
-	defer s.mutex.RUnlock()
+	s.Mutex.RLock()
+	defer s.Mutex.RUnlock()
 
 	if _, ok := s.V4IPToPod[address.String()]; ok {
 		return true
@@ -605,8 +605,8 @@ func (s *Subnet) isIPAssignedToOtherPod(ip, podName string) (string, bool) {
 }
 
 func (s *Subnet) AddOrUpdateIPPool(name string, ips []string) error {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
+	s.Mutex.Lock()
+	defer s.Mutex.Unlock()
 
 	pool := &IPPool{
 		V4IPs:       NewEmptyIPRangeList(),
@@ -700,8 +700,8 @@ func (s *Subnet) AddOrUpdateIPPool(name string, ips []string) error {
 }
 
 func (s *Subnet) RemoveIPPool(name string) {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
+	s.Mutex.Lock()
+	defer s.Mutex.Unlock()
 
 	p := s.IPPools[name]
 	if p == nil {
@@ -727,8 +727,8 @@ func (s *Subnet) IPPoolStatistics(ippool string) (
 	v4Available, v4Using, v6Available, v6Using internal.BigInt,
 	v4AvailableRange, v4UsingRange, v6AvailableRange, v6UsingRange string,
 ) {
-	s.mutex.Lock()
-	defer s.mutex.Unlock()
+	s.Mutex.Lock()
+	defer s.Mutex.Unlock()
 
 	p := s.IPPools[ippool]
 	if p == nil {