Drives a real unopenable lock path — a directory where the code expects a
regular file, so open() raises a genuine kernel OSError — rather than
monkeypatching the helpers, standing in for the ENOSPC/EMFILE the field reports
hit without needing to fill a disk.
Both authorities are covered at the primitive and the behavior level:
fts_rebuild_admission refuses admission and rebuild_fts() reports no progress
(asserted against a preceding successful rebuild, so the 0 is the deferral and
not an unrelated no-op); _cross_process_repair_lock refuses the authority and
repair_state_db_schema runs no writable_schema surgery, takes no forensic
backup, and leaves the damaged image byte-identical for the next authorised
pass. A guardrail test pins that a pathless in-memory store is still admitted,
so the fix cannot turn that legitimate no-op into a permanent deferral.
All four deferral assertions fail on the pre-fix code, where the repair test
shows the surgery really did proceed without cross-process authority.
HexLab98
b4d691183b