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Rongsong Shen e80abd5cc4 docs(raft-ha-core-safety): unify 7.2 round-N blocker via gdb — one restart-stability bug (SIGSEGV / iomgr accept-hang) 
Used the now-available gdb (wrapped the release controller under gdb -batch via
XCE_HA_BIN) to expose the round-4 blocker's second face. Findings:

- The release-build SIGSEGV and a gdb-run accept-loop HANG are the SAME restart-
  time I/O-subsystem corruption: under gdb the memory bug is perturbed away from
  a crash and instead wedges the inbound-accept path (ctrl-3 stops accepting at
  03:42:03 while still firing its own election timer), so two restarted survivors
  can never exchange PreVotes -> permanent round-N stall.
- This is a restart-STABILITY bug, NOT a consensus-logic gap: PreVote/eligibility/
  freshness (incl. 5.3) are correct; the restarted node is simply I/O-dead. It
  predates this session (baseline 21e26a1 failed round 3-4).
- Heisenbug: invisible under ASAN and under gdb; no usable core (read-only
  core_pattern -> non-running systemd-coredump). Needs a non-ASAN DEBUG (-O0 -g)
  build under gdb, or a host with a live coredump pipeline, to backtrace.

Updates research.md, refines task 5.4 (the unified restart-stability bug +
the debug-build path), updates bug-1281. Consensus correctness (Phase-2/5.2/5.3)
is unaffected and validated for every round that completes (2-round soak PASSES;
6-round rounds 1-3 elect; zero job loss; committed prefix byte-identical).

Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019dbTHR9CsEYK9RsqmQpQpC
2026-06-30 03:57:51 +00:00
..
design.md docs(raft-ha-core-safety): retarget Phase 4/5 to RDHUP-flap root cause 2026-06-28 03:24:12 +00:00
requirements.md docs(raft-ha-core-safety): finalize spec (requirements, design, research, tasks) 2026-06-27 04:37:07 +00:00
research.md docs(raft-ha-core-safety): unify 7.2 round-N blocker via gdb — one restart-stability bug (SIGSEGV / iomgr accept-hang) 2026-06-30 03:57:51 +00:00
spec.json docs(raft-ha-core-safety): finalize spec (requirements, design, research, tasks) 2026-06-27 04:37:07 +00:00
tasks.md docs(raft-ha-core-safety): unify 7.2 round-N blocker via gdb — one restart-stability bug (SIGSEGV / iomgr accept-hang) 2026-06-30 03:57:51 +00:00