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>

2026-10-03 23:18:53 +00:00

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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

Loop src/xceadmin/tests/test_e2e_live_ha_push.py under heavy CPU load with XCE_KEEP_DEPLOY_DIR=1.
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