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feat(ha): reference-counted ha_elect_ctx_t lifecycle (ha-elect-ctx-lifecycle)

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Replace the deliberate election-carrier leak with an atomic refcount:
a bias reference held by ha->elect_ctx plus one reference per captured
vote endpoint, released via a new endpoint_t.on_fini teardown-completion
hook (fired once, before ep->data is freed). Both real-election and
PreVote capture sites (raft_cb_send_vote_request,
raft_cb_send_pre_vote_request) increment on capture; both publish sites
(ha_start_election_async, ha_start_prevote_async) now atomic_exchange
the outgoing carrier and release it instead of leaking or freeing
outright, so a still-outstanding vote endpoint keeps the superseded
carrier alive until its own teardown completes.

Verified: 758+ controller tests green, isolated LeakSanitizer run shows
zero ha_elect_ctx_t leaks across many election/PreVote rounds, no
premature-free/UAF under supersession, and a live 10-round HA soak
(36 jobs, zero loss, all 3 nodes served as primary).
This commit is contained in:
Rongsong Shen 2026-07-12 04:25:42 +00:00
parent 58e047f533
commit 6529dcf08f
14 changed files with 879 additions and 22 deletions
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src/controller/meson.build
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@ -112,6 +112,7 @@ controller_unit_test_src = [
'testsuite/test_worker_join.c',
'testsuite/test_ha_startup.c',
'testsuite/test_ha_election.c',
'testsuite/test_ha_elect_ctx_lifecycle.c',
'testsuite/test_ha_bootstrap.c',
'testsuite/test_ha_bootstrap_support.c',
'testsuite/test_ha_durability.c',