# NousResearch/hermes-agent · Fix segfault from unsynchronized SessionDB reads during close

## Open now

- Nothing open on GitHub.

These issues and PRs address a SIGSEGV/SystemError caused by lock-free SessionDB reads racing with Connection.close() inside pysqlite's statement cache. The proposed fixes involve serializing or routing reads to eliminate unsynchronized access on the shared writer connection.

## TL;DR

- 4 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 2 PR(s) closed without merging.
- A fix was merged to main in PR #99502. Verify it addresses your case.
- **Recommended:** read PR #99502 (and any competing PRs below) before filing. Confirm the merged change covers your symptom.

## Maintainer resolution verdict

- Internal-tracker verdict over this cluster's issue members: `resolved` · deciding PR(s): `pr-99502`. This is distinct from the fix status above. Weigh it yourself.

## How this cluster was grouped

- Link evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
- Pairwise link density `0.50`: the share of member pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. `1.00` means every pair is linked.

## Closed / duplicate issues

- #99349: SIGSEGV: lock-free SessionDB reads race Connection.close() inside pysqlite's statement cache

## Prior & competing PRs

- **#99502: fix(state): eliminate unsynchronized reads on the shared SessionDB writer connection (SIGSEGV / SystemError class)**. merged to main · fix tier `verified`
  - maintainer direction: category `merged`
  - files: `hermes_state.py`, `hermes_state_search.py`, `tests/state/test_writer_conn_thread_safety.py`, `tests/test_hermes_state_conn_lock_audit.py`, `tests/test_session_db_read_path_split.py`
- **#99366: fix(sessions): serialize SessionDB reads during close**. closed without merge
  - maintainer direction: category `implemented_elsewhere`; implication `superseded`; refs `#99502`
- **#99435: fix(state): route lock-free SessionDB reads through _read_ctx (segfault racing close())**. closed without merge
  - maintainer direction: category `merged_via`; implication `superseded`; refs `#99349`, `#82428`

## Fix status

- Merged to main in PR #99502 (cited above). No release data is tracked. Verify downstream.
- Fix last verified (merged) `2026-08-31`.