First acceptance chaotic soak (6 rounds, real-fs ext4, release binaries rebuilt
at HEAD 01419e1 with Phase-2 payload fix + Phase-5 5.2 suppression). Outcome:
PASS (job safety + landed fixes):
- Zero committed-job loss (all tracked jobs present on the new primary each round).
- Committed prefix [1..11] byte-identical across all 3 members — Phase-2 payload-loss
signature absent. All counted walcompare divergences are present=2 catch-up-LAG
MISSING tails of restarted-uncaught followers (tips 19/15/11), not corruption.
- Rounds 1-3 elect a strictly higher-term primary; 5.2 spurious-failover suppression
confirmed working (round-4 genuine-loss takes the failover path, not suppression).
NO-GO (R8.3 liveness):
- Round-4 election STALL after 3 overlapping kills: the up-to-date leader (tip 19)
is killed, both survivors are lagging (15, 11) but each holds the full committed
prefix; their PreVote rounds repeatedly time out with no grant quorum, so no
primary is elected. Distinct from the 5.2 flap. Contributors: freshness
mutual-denial, in_catch_up-denies-all-votes (Req 2.5, obs 1240) with no live
primary to catch up from, and/or unestablished peer vote connections.
Per the chaotic-harness contingency: recorded full classification in research.md
§"Task 7.2"; added task 5.3 (lagging-but-safe survivor must be electable under
overlapping churn); 7.2 marked _Blocked_ on 5.3; logged bug-1272. Frozen evidence
at /home/claude/tmp/ha-7p2-frozen.
Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019dbTHR9CsEYK9RsqmQpQpC
Rongsong Shen
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