# NousResearch/hermes-agent · Fix WAL append errors and unsafe shared connection reads

## Open now

- Nothing open on GitHub.

These items address retry logic for a specific WAL append error and eliminate unsynchronized reads on a shared SessionDB writer connection that could cause crashes or SystemErrors.

## TL;DR

- 3 member(s): 0 open issue(s), 1 closed issue(s), 0 open PR(s), 1 merged PR(s), 1 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evidence (`STRUCTURAL_SPANNING`): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 `0.67`: 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

- #85079: fix(state): retry 'returned NULL without setting an exception' on contended WAL append

## 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`
- **#85065: fix(state): retry 'returned NULL without setting an exception' on WAL append**. closed without merge
  - maintainer direction: category `superseded_by_pr`; implication `superseded`; refs `#85079`

## Fix status

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