EC
SQLITE_IOERR_UNLOCK
SQLiteERRORNotableI/O Errorofficial confidence

I/O error releasing file lock

Production Risk

High — other connections may remain blocked on the lock.

What this means

SQLITE_IOERR_UNLOCK (2058) is returned when the OS reports an error while SQLite tries to release (unlock) a file lock after completing a transaction.

Why it happens
  1. 1OS error on fcntl(F_UNLCK) during lock release.
  2. 2File descriptor invalidated before unlock (e.g., file closed by signal handler).
How to reproduce

Post-commit lock release failure.

trigger — this will error
trigger — this will error
# SQLITE_IOERR_UNLOCK surfaces as disk I/O error after COMMIT

expected output

sqlite3.DatabaseError: disk I/O error

Fix 1

Fix 2

Sources
Official documentation ↗

sqlite3.h — SQLITE_IOERR_UNLOCK = 2058

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