neutron cannot work with privsep errors

[gundami]

neutron dhcp, l3 angent, linuxbridge agent all cannot work and have the same privsep log:

2020-12-17 07:58:42.693 195226 INFO neutron.agent.dhcp.agent [-] Starting network ee9772c2-ef75-4215-a241-e6071bd70bf4 dhcp configuration
2020-12-17 07:58:42.696 195226 INFO oslo.privsep.daemon [-] Running privsep helper: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'privsep-helper', '--config-file', '/usr/share/neutron/neutron-dist.conf', '--config-file', '/etc/neutron/neutron.conf', '--config-file', '/etc/neutron/dhcp_agent.ini', '--config-dir', '/etc/neutron/conf.d/neutron-dhcp-agent', '--privsep_context', 'neutron.privileged.default', '--privsep_sock_path', '/tmp/tmpt9sini8p/privsep.sock']
2020-12-17 07:58:44.318 195226 CRITICAL oslo.privsep.daemon [-] privsep helper command exited non-zero (1)
2020-12-17 07:58:44.320 195226 ERROR neutron.agent.dhcp.agent [-] Unable to enable dhcp for ee9772c2-ef75-4215-a241-e6071bd70bf4.: oslo_privsep.daemon.FailedToDropPrivileges: privsep helper command exited non-zero (1)

/etc/sudoers.d/nova

Defaults:nova !requiretty

nova ALL = (root) NOPASSWD: /usr/bin/nova-rootwrap /etc/nova/rootwrap.conf *
nova ALL = (root) NOPASSWD: /usr/bin/privsep-helper *
nova ALL = (root) NOPASSWD: /usr/bin/nova-rootwrap

/etc/sudoers.d/neutron

Defaults:neutron !requiretty

neutron ALL = (root) NOPASSWD: /usr/bin/neutron-rootwrap /etc/neutron/rootwrap.conf *
neutron ALL = (root) NOPASSWD: /usr/bin/neutron-rootwrap-daemon /etc/neutron/rootwrap.conf *
neutron ALL = (root) NOPASSWD: /usr/bin/privsep-helper *
neutron ALL = (root) NOPASSWD: /usr/sbin/iptables-save *

[glm100 (glm100)]

the same problem to me.

[ITROBOT (itrobot)]

the same problem to me.

[hakim (hakim951753)]

is there anyone solved this problem