docs(buglog): bug-1913 and bug-1916 fixed; log bug-1915, bug-1917, bug-1918

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

.wolf/bugs/bug-1915.md

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+---
+id: "bug-1915"
+status: "investigating"
+status_updated: "2026-10-03"
+status_note: "single log sample; reproduce under load and check election/term handling around elect_ctx replacement"
+component: "controller"
+severity: "wrong-result"
+timestamp: "2026-10-03T16:10:25Z"
+last_seen: "2026-10-03T16:10:25Z"
+occurrences: 1
+files: ["src/controller/ha.c"]
+tags: ["ha", "raft", "election", "prevote"]
+related: ["bug-1913"]
+---
+
+# bug-1915: two PreVote wins in one election replace elect_ctx; term-2 leader then finds no vote eps to promote
+
+## Description
+**Observed:**
+In one primary log captured during the bug-1913 investigation (late-joiner election under 40-spinner CPU load), "PreVote round WON" appears twice (prospective terms 2 and 3). The second real election replaced `ha->elect_ctx`, and the term-2 `raft_cb_become_leader` then found no vote endpoints to promote into standby channels, so both standbys had to register later as late joiners (bug-1913). A term-2 leader was also logged after the term-3 election had started.
+
+**Expected:** one election round per prospective term; a node that becomes leader promotes the vote connections from the election that elected it (or the stale election cannot complete leadership).
+**Impact:** unconfirmed (single sample). It is the trigger for late-joiner elections (bug-1913, now mitigated by an immediate catch-up probe), and a leader logged for an older term after a newer election started needs a Raft-safety check (term monotonicity, which election's votes made it leader).
+**Found by:** test (bug-1913 investigation, 2026-10-03)
+
+## Environment
+- OS: no /etc/os-release; Docker container; NixOS kernel; kernel Linux 6.18.33 x86_64
+- libc: glibc 2.42-47 (interpreter /nix/store/wb6rhpznjfczwlwx23zmdrrw74bayxw4-glibc-2.42-47/lib/ld-linux-x86-64.so.2)
+- Toolchain: gcc (GCC) 15.2.0, meson 1.9.1
+- Build: asan (xce.build)
+- Code: scheduler-framework @ 6d9ef3d0-dirty
+- Deployment: local 3-node HA (xceadmin live HA fixture), 40 busy loops on 32 cores
+
+## Reproduction
+1. Loop `src/xceadmin/tests/test_e2e_live_ha_push.py` under heavy CPU load with `XCE_KEEP_DEPLOY_DIR=1`.
+2. In the elected primary's log, look for two "PreVote round WON" lines in one election and a `raft_cb_become_leader` that promotes no vote endpoints.
+- Frequency: 1/40 runs, 2026-10-03 (single log sample under 40-spinner load; not yet reproduced deliberately)
+- Evidence: not kept (scratchpad loop logs from the bug-1913 investigation)
+
+## Root cause
+TODO: required for fixed/partial
+
+## Fix
+TODO: required for fixed/partial
+
+## Verification
+- Test: TODO: name + file; RED before the fix, GREEN after
+- Suites: TODO: suite results and build profile
+- Live: TODO: soak/deploy run, or n/a and why
+
+## References
+- Related: none