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Overview of the Issue

When I do the consul auto-election testing, I found that when 2/3 node down, the cluster is stopped to work, I know this is right, when I start a node before stopped, now 2/3 node is started, but the log always output election timeout, and cluster still cannot provides services, with version 1.6.10, everything is ok, start with 1.7.0 is not ok, I tested version 1.6.10、1.7.0、1.9.6、1.10.0, only 1.6.10 work normally

Reproduction Steps

Steps to reproduce this issue, eg:

1. Create a cluster with 3 server nodes
   2.stop 1/3 node
   3.stop 2/3 node
   4.start 1/2 node before stopped
   5.now 2/3 node started
   6.cluster is not work, there is no leader

Consul info for both Client and Server

agent:
	check_monitors = 0
	check_ttls = 0
	checks = 0
	services = 0
build:
	prerelease =
	revision = 95fb95bf
	version = 1.7.0
consul:
	acl = disabled
	bootstrap = false
	known_datacenters = 1
	leader = false
	leader_addr =
	server = true
raft:
	applied_index = 0
	commit_index = 0
	fsm_pending = 0
	last_contact = never
	last_log_index = 68
	last_log_term = 6
	last_snapshot_index = 0
	last_snapshot_term = 0
	latest_configuration = [{Suffrage:Voter ID:bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc Address:10.6.0.21:8300} {Suffrage:Voter ID:d244e694-c619-cf0a-e3d6-701bd510b70d Address:10.6.0.22:8300} {Suffrage:Voter ID:5fc5e757-a1c5-e6f0-ed28-3149d68e44bf Address:10.6.0.23:8300}]
	latest_configuration_index = 0
	num_peers = 2
	protocol_version = 3
	protocol_version_max = 3
	protocol_version_min = 0
	snapshot_version_max = 1
	snapshot_version_min = 0
	state = Candidate
	term = 108
runtime:
	arch = amd64
	cpu_count = 2
	goroutines = 73
	max_procs = 2
	os = linux
	version = go1.12.16
serf_lan:
	coordinate_resets = 0
	encrypted = false
	event_queue = 0
	event_time = 5
	failed = 0
	health_score = 0
	intent_queue = 0
	left = 0
	member_time = 14
	members = 2
	query_queue = 0
	query_time = 1
serf_wan:
	coordinate_resets = 0
	encrypted = false
	event_queue = 0
	event_time = 1
	failed = 0
	health_score = 0
	intent_queue = 0
	left = 0
	member_time = 14
	members = 2
	query_queue = 0
	query_time = 1

Operating system and Environment details

cat /etc/centos-release
CentOS Linux release 7.9.2009 (Core)
uname -a
Linux consul-02 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

Virtual Machine

Log Fragments

consul members
Node Address Status Type Build Protocol DC Segment
consul-02 10.6.0.22:8301 alive server 1.7.0 2 my-dc-1
consul-03 10.6.0.23:8301 alive server 1.7.0 2 my-dc-1
consul operator raft list-peers
Error getting peers: Failed to retrieve raft configuration: Unexpected response code: 500 (No cluster leader)

consul-01
now is stopped

consul-02
Jun 25 14:40:27 consul-02 consul: 2021-06-25T14:40:27.168Z [WARN] agent.server.raft: Election timeout reached, restarting election
Jun 25 14:40:27 consul-02 consul: 2021-06-25T14:40:27.168Z [INFO] agent.server.raft: entering candidate state: node="Node at 10.6.0.22:8300 [Candidate]" term=122
Jun 25 14:40:27 consul-02 consul: 2021-06-25T14:40:27.169Z [WARN] agent.server.raft: unable to get address for sever, using fallback address: id=bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc fallback=10.6.0.21:8300 error="Could not find address for server id bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc"
Jun 25 14:40:27 consul-02 consul: 2021-06-25T14:40:27.169Z [ERROR] agent.server.raft: failed to make requestVote RPC: target="{Voter bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc 10.6.0.21:8300}" error="dial tcp ->10.6.0.21:8300: connect: connection refused"

consul-03
Jun 25 14:40:56 consul-03 consul: 2021-06-25T14:40:56.707Z [INFO] agent.server.raft: entering follower state: follower="Node at 10.6.0.23:8300 [Follower]" leader=
Jun 25 14:41:00 consul-03 consul: 2021-06-25T14:41:00.100Z [ERROR] agent: Coordinate update error: error="No cluster leader"
Jun 25 14:41:01 consul-03 consul: 2021-06-25T14:41:01.921Z [WARN] agent.server.raft: heartbeat timeout reached, starting election: last-leader=
Jun 25 14:41:01 consul-03 consul: 2021-06-25T14:41:01.921Z [INFO] agent.server.raft: entering candidate state: node="Node at 10.6.0.23:8300 [Candidate]" term=128
Jun 25 14:41:01 consul-03 consul: 2021-06-25T14:41:01.922Z [WARN] agent.server.raft: unable to get address for sever, using fallback address: id=bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc fallback=10.6.0.21:8300 error="Could not find address for server id bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc"
Jun 25 14:41:01 consul-03 consul: 2021-06-25T14:41:01.923Z [ERROR] agent.server.raft: failed to make requestVote RPC: target="{Voter bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc 10.6.0.21:8300}" error="dial tcp ->10.6.0.21:8300: connect: connection refused"
Jun 25 14:41:06 consul-03 consul: 2021-06-25T14:41:06.683Z [INFO] agent.server.raft: duplicate requestVote for same term: term=128
Jun 25 14:41:07 consul-03 consul: 2021-06-25T14:41:07.135Z [WARN] agent.server.raft: Election timeout reached, restarting election
Jun 25 14:41:07 consul-03 consul: 2021-06-25T14:41:07.135Z [INFO] agent.server.raft: entering candidate state: node="Node at 10.6.0.23:8300 [Candidate]" term=129
Jun 25 14:41:07 consul-03 consul: 2021-06-25T14:41:07.136Z [WARN] agent.server.raft: unable to get address for sever, using fallback address: id=bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc fallback=10.6.0.21:8300 error="Could not find address for server id bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc"
Jun 25 14:41:07 consul-03 consul: 2021-06-25T14:41:07.137Z [ERROR] agent.server.raft: failed to make requestVote RPC: target="{Voter bfb6b7bc-3cbd-6c1a-b3b2-f22e0c705afc 10.6.0.21:8300}" error="dial tcp ->10.6.0.21:8300: connect: connection refused"