Comment 0 for bug 1835044

Description of problem:
Memory leak in privsep-helper(neutron agents) when create/destroy action are executed.

Version-Release number of selected component (if applicable):

How reproducible:
Rocky and Queens are affected

Steps to Reproduce:
1. Deploy Osp 14
2.create the next scripts:
(overcloud) [stack@undercloud-0 ~]$ cat create2.sh
set -x

ips=(0 10.0.0.215 10.0.0.249 10.0.0.223 10.0.0.222 10.0.0.218 10.0.0.247 10.0.0.210 10.0.0.220 10.0.0.246 10.0.0.213 10.0.0.224 10.0.0.212 10.0.0.217 10.0.0.221 10.0.0.216)
ips=(0 10.0.0.220 10.0.0.216 10.0.0.235 10.0.0.232 10.0.0.245 10.0.0.226 10.0.0.217 10.0.0.211 10.0.0.221 10.0.0.230 10.0.0.248 10.0.0.228 10.0.0.223 10.0.0.212 10.0.0.225)
openstack network create net_$1
openstack subnet create --network net_$1 --dns-nameserver 10.0.0.1 --gateway 10.$1.0.1 --subnet-range 10.$1.0.0/16 net_$1
openstack router create router_$1
openstack router add subnet router_$1 net_$1
#openstack router set router_$1 --external-gateway public

#openstack server create --flavor cirros --image cirros --nic net-id=net$1 --security-group test --key-name mykey vm$1

#openstack server add floating ip vm$1 ${ips[$1]}

#ping ${ips[$1]} -c 10
(overcloud) [stack@undercloud-0 ~]$ cat delete2.sh

#openstack server delete vm$1
openstack router remove subnet router_$1 net_$1
openstack network delete net_$1
openstack router delete router_$1

3. Execute:

for j in $(seq 1 10); do for i in $(seq 1 10) ; do ./create2.sh $i ; done ; for i in $(seq 1 10) ; do ./delete2.sh $i ; done ;echo "####LOOP $j ####" ;done

Chech the memory usage of the privsep-helper in the controllers:

[root@controller-1 heat-admin]# top -c -p 125052 -p 278912

top - 22:37:22 up 9 days, 4:59, 1 user, load average: 4.45, 3.71, 3.77
Tasks: 2 total, 0 running, 2 sleeping, 0 stopped, 0 zombie
%Cpu(s): 19.8 us, 4.1 sy, 0.0 ni, 75.2 id, 0.0 wa, 0.0 hi, 0.8 si, 0.0 st
KiB Mem : 32779936 total, 3150768 free, 16209200 used, 13419968 buff/cache
KiB Swap: 0 total, 0 free, 0 used. 15146444 avail Mem

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 125052 root 20 0 2497576 2.2g 2468 S 0.0 7.2 76:06.44 /usr/bin/python2 /bin/privsep-helper --config-file /usr/share/neutron/neutron-dist.conf --config-file /etc/neutron/neutron.conf --config-fi+
 278912 root 20 0 1048908 897004 2468 S 0.0 2.7 13:55.34 /usr/bin/python2 /bin/privsep-helper --config-file /usr/share/neutron/neutron-dist.conf --config-file /etc/neutron/neutron.conf --config-fi+

The important colunm is RES

Actual results:

Memory usage increases in every loop.

Expected results:

Memory usage should be stable

Additional info:

Leak is in pyroute2--> necessary update version to 0.5.2.x

More info :

https://bugzilla.redhat.com/show_bug.cgi?id=1723597