Files
hermes-agent/tests
Teknium 5567846006 fix(state): retry transient disk I/O errors before WAL fallback
Salvages #55322 (ZFS 'disk i/o error' marker) without regressing the
Bug D transient-EIO protection from 5c49cd0ed0. 'disk i/o error' is
ambiguous: deterministic on ZFS/APFS-CoW SHM corruption (#55305,
#71498) but often a one-shot transient (page-cache pressure, lock
contention). A blind marker match re-introduced the mixed-journal-mode
corruption pattern; a blind re-raise wedged state.db on ZFS.

Disambiguate: retry the WAL pragma twice with a short backoff. A
transient EIO clears and WAL proceeds; a deterministic failure keeps
raising and falls through to the guarded DELETE fallback (still
refusing to downgrade a DB whose on-disk header reports WAL).

Tests: transient-EIO recovery, persistent-EIO fallback, and the
never-downgrade-WAL-on-disk guard.
2026-07-29 18:13:09 -07:00
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