diff --git a/bugfix-dhclient-check-if-pid-was-held.patch b/bugfix-dhclient-check-if-pid-was-held.patch
new file mode 100644
index 0000000000000000000000000000000000000000..dd53f0b6b5d547089779c5746eeaddfa9177e2fe
--- /dev/null
+++ b/bugfix-dhclient-check-if-pid-was-held.patch
@@ -0,0 +1,45 @@
+From bab9f6ff2345fb5a1db048349fe088c1ee7d440b Mon Sep 17 00:00:00 2001
+From: Anonymous_Z <zhangrui182@huawei.com>
+Date: Tue, 3 Mar 2020 17:36:41 +0800
+Subject: [PATCH] dhcp: recheck whether last pid was held by other process
+
+Signed-off-by: zhanglu <zhanglu37@huawei.com>
+---
+ client/dhclient.c | 13 ++++++++++++-
+ 1 file changed, 12 insertions(+), 1 deletion(-)
+
+diff --git a/client/dhclient.c b/client/dhclient.c
+index 9f8ba06..97b04e0 100644
+--- a/client/dhclient.c
++++ b/client/dhclient.c
+@@ -774,15 +774,26 @@ main(int argc, char **argv) {
+ 		}
+ 	} else {
+ 		FILE *pidfp = NULL;
++		FILE *commfp = NULL;
+ 		long temp = 0;
+ 		pid_t dhcpid = 0;
+ 		int dhc_running = 0;
+ 		char procfn[256] = "";
++		char pidname_path[256] = "";
++		char pidname[256] = "";
+ 
+ 		if ((pidfp = fopen(path_dhclient_pid, "re")) != NULL) {
+ 			if ((fscanf(pidfp, "%ld", &temp)==1) && ((dhcpid=(pid_t)temp) > 0)) {
+ 				snprintf(procfn,256,"/proc/%u",dhcpid);
+-				dhc_running = (access(procfn, F_OK) == 0);
++				snprintf(pidname_path,256,"%s/comm",procfn);
++
++				if(access(procfn, F_OK) == 0) {
++					if((commfp = fopen(pidname_path, "r")) != NULL) {
++						fscanf(commfp, "%s", pidname);
++						dhc_running = (strncmp("dhclient", pidname, strlen("dhclient")) == 0);
++						fclose(commfp);
++					}
++				}
+ 			}
+ 
+ 			fclose(pidfp);
+-- 
+1.8.3.1
+
diff --git a/dhcp.spec b/dhcp.spec
index 4bd5fe16a8f8866db5d422aacb6718c6714845c2..2fd44f8404cd0a1f5ba156c82f7b434ab1c785c9 100644
--- a/dhcp.spec
+++ b/dhcp.spec
@@ -3,7 +3,7 @@
 
 Name:      dhcp
 Version:   4.3.6
-Release:   35
+Release:   37
 Summary:   Dynamic host configuration protocol software
 #Please don't change the epoch on this package
 Epoch:     12
@@ -69,6 +69,8 @@ Patch9000: dhcp-fix-dhclient-default-len-64-to-128.patch
 Patch9001: bugfix-dhcpd-2038-problem.patch
 Patch9002: adds-address-prefix-len-to-dhclient-cli.patch
 Patch9003: dhcpd-coredump-infiniband.patch
+Patch9004: bugfix-dhclient-check-if-pid-was-held.patch
+
 
 BuildRequires: gcc autoconf automake libtool openldap-devel krb5-devel libcap-ng-devel bind-export-devel
 BuildRequires: systemd systemd-devel
@@ -204,6 +206,7 @@ install -D -p -m 0644 contrib/ldap/dhcp.schema $RPM_BUILD_ROOT%{_sysconfdir}/ope
 find $RPM_BUILD_ROOT -type f -name "*.la" -delete -print
 
 %check
+make check
 
 %pre
 %global gid_uid 177
@@ -305,6 +308,18 @@ exit 0
 %{_mandir}/man3/omapi.3.gz
 
 %changelog
+* Tue Mar 3 2020 zhanglu<zhanglu37@huawei.com> - 4.3.6-37
+- Type:bugfix
+- ID:NA
+- SUG:restart
+- DESC: recheck if last pid was held by other process
+
+* Fri Feb 21 2020 zhanglu<zhanglu37@huawei.com> - 4.3.6-36
+- Type:enhancement
+- ID:NA
+- SUG:NA
+- DESC: add make check
+
 * Wed Jan 22 2020 zhanglu<zhanglu37@huawei.com> - 4.3.6-35
 - Type:bugfix
 - ID:NA