diff --git a/src/box/raft.c b/src/box/raft.c
index 24f65ada7d6cce007fa1f5e4d62c03097ca69f9c..b70f47006e90542f8fb2369af63c6330b4be5db2 100644
--- a/src/box/raft.c
+++ b/src/box/raft.c
@@ -449,7 +449,14 @@ raft_process_msg(const struct raft_request *req, uint32_t source)
if (source == raft.leader) {
say_info("RAFT: the node %u has resigned from the "
"leader role", raft.leader);
- raft_sm_schedule_new_election();
+ /*
+ * Candidate node clears leader implicitly when starts a
+ * new term, but non-candidate won't do that, so clear
+ * it manually.
+ */
+ raft.leader = 0;
+ if (raft.is_candidate)
+ raft_sm_schedule_new_election();
}
return 0;
}
diff --git a/test/replication/gh-5426-election-on-off.result b/test/replication/gh-5426-election-on-off.result
new file mode 100644
index 0000000000000000000000000000000000000000..1abfb9154102be8f92e6f46e1d98d22bce847bb3
--- /dev/null
+++ b/test/replication/gh-5426-election-on-off.result
@@ -0,0 +1,134 @@
+-- test-run result file version 2
+test_run = require('test_run').new()
+ | ---
+ | ...
+box.schema.user.grant('guest', 'super')
+ | ---
+ | ...
+
+old_election_mode = box.cfg.election_mode
+ | ---
+ | ...
+old_replication_timeout = box.cfg.replication_timeout
+ | ---
+ | ...
+
+test_run:cmd('create server replica with rpl_master=default,\
+ script="replication/replica.lua"')
+ | ---
+ | - true
+ | ...
+test_run:cmd('start server replica with wait=True, wait_load=True')
+ | ---
+ | - true
+ | ...
+
+--
+-- gh-5426: leader resignation could crash non-candidate nodes.
+--
+-- Small timeout to speed up the election.
+box.cfg{ \
+ replication_timeout = 0.1, \
+ election_mode = 'candidate', \
+}
+ | ---
+ | ...
+
+-- First crash could happen when the election was disabled on the non-leader
+-- node.
+test_run:wait_cond(function() return box.info.election.state == 'leader' end)
+ | ---
+ | - true
+ | ...
+
+test_run:switch('replica')
+ | ---
+ | - true
+ | ...
+test_run:wait_cond(function() return box.info.election.leader ~= 0 end)
+ | ---
+ | - true
+ | ...
+
+test_run:switch('default')
+ | ---
+ | - true
+ | ...
+box.cfg{election_mode = 'off'}
+ | ---
+ | ...
+
+test_run:switch('replica')
+ | ---
+ | - true
+ | ...
+test_run:wait_cond(function() return box.info.election.leader == 0 end)
+ | ---
+ | - true
+ | ...
+
+-- Another crash could happen if election mode was 'voter' on the non-leader
+-- node.
+box.cfg{election_mode = 'voter'}
+ | ---
+ | ...
+
+test_run:switch('default')
+ | ---
+ | - true
+ | ...
+box.cfg{election_mode = 'candidate'}
+ | ---
+ | ...
+test_run:wait_cond(function() return box.info.election.state == 'leader' end)
+ | ---
+ | - true
+ | ...
+
+test_run:switch('replica')
+ | ---
+ | - true
+ | ...
+test_run:wait_cond(function() return box.info.election.leader ~= 0 end)
+ | ---
+ | - true
+ | ...
+
+test_run:switch('default')
+ | ---
+ | - true
+ | ...
+box.cfg{election_mode = 'off'}
+ | ---
+ | ...
+
+test_run:switch('replica')
+ | ---
+ | - true
+ | ...
+test_run:wait_cond(function() return box.info.election.leader == 0 end)
+ | ---
+ | - true
+ | ...
+
+test_run:switch('default')
+ | ---
+ | - true
+ | ...
+test_run:cmd('stop server replica')
+ | ---
+ | - true
+ | ...
+test_run:cmd('delete server replica')
+ | ---
+ | - true
+ | ...
+box.cfg{ \
+ election_mode = old_election_mode, \
+ replication_timeout = old_replication_timeout, \
+}
+ | ---
+ | ...
+box.schema.user.revoke('guest', 'super')
+ | ---
+ | ...
diff --git a/test/replication/gh-5426-election-on-off.test.lua b/test/replication/gh-5426-election-on-off.test.lua
new file mode 100644
index 0000000000000000000000000000000000000000..d6b980d0a290cd08b9a0202a56e7045a98133cb9
--- /dev/null
+++ b/test/replication/gh-5426-election-on-off.test.lua
@@ -0,0 +1,57 @@
+test_run = require('test_run').new()
+box.schema.user.grant('guest', 'super')
+
+old_election_mode = box.cfg.election_mode
+old_replication_timeout = box.cfg.replication_timeout
+
+test_run:cmd('create server replica with rpl_master=default,\
+ script="replication/replica.lua"')
+test_run:cmd('start server replica with wait=True, wait_load=True')
+
+--
+-- gh-5426: leader resignation could crash non-candidate nodes.
+--
+-- Small timeout to speed up the election.
+box.cfg{ \
+ replication_timeout = 0.1, \
+ election_mode = 'candidate', \
+}
+
+-- First crash could happen when the election was disabled on the non-leader
+-- node.
+test_run:wait_cond(function() return box.info.election.state == 'leader' end)
+
+test_run:switch('replica')
+test_run:wait_cond(function() return box.info.election.leader ~= 0 end)
+
+test_run:switch('default')
+box.cfg{election_mode = 'off'}
+
+test_run:switch('replica')
+test_run:wait_cond(function() return box.info.election.leader == 0 end)
+
+-- Another crash could happen if election mode was 'voter' on the non-leader
+-- node.
+box.cfg{election_mode = 'voter'}
+
+test_run:switch('default')
+box.cfg{election_mode = 'candidate'}
+test_run:wait_cond(function() return box.info.election.state == 'leader' end)
+
+test_run:switch('replica')
+test_run:wait_cond(function() return box.info.election.leader ~= 0 end)
+
+test_run:switch('default')
+box.cfg{election_mode = 'off'}
+
+test_run:switch('replica')
+test_run:wait_cond(function() return box.info.election.leader == 0 end)
+
+test_run:switch('default')
+test_run:cmd('stop server replica')
+test_run:cmd('delete server replica')
+box.cfg{ \
+ election_mode = old_election_mode, \
+ replication_timeout = old_replication_timeout, \
+}
+box.schema.user.revoke('guest', 'super')
diff --git a/test/replication/suite.cfg b/test/replication/suite.cfg
index a862f5a97d0809403cc15c9665cdd5f1962f1a36..766f276a292b9dfca6c7014324c65ef9fbf48437 100644
--- a/test/replication/suite.cfg
+++ b/test/replication/suite.cfg
@@ -14,6 +14,7 @@
"gh-3760-misc-return-on-quorum-0.test.lua": {},
"gh-4399-misc-no-failure-on-error-reading-wal.test.lua": {},
"gh-4424-misc-orphan-on-reconfiguration-error.test.lua": {},
+ "gh-5426-election-on-off.test.lua": {},
"once.test.lua": {},
"on_replace.test.lua": {},
"status.test.lua": {},