SQLITE_IOERR_FSYNC
SQLiteFATALCriticalI/O Errorofficial confidence
I/O error during fsync()
Production Risk
Critical — committed data may not be durable.
What this means
SQLITE_IOERR_FSYNC (1034) is returned when the OS reports an error during an fsync() or FlushFileBuffers() call. SQLite calls fsync() to ensure data is durably written to disk before completing a transaction commit.
Why it happens
- 1Disk hardware failure during fsync.
- 2Some filesystems (e.g., certain NFS mounts) return EIO on fsync.
- 3SSD firmware bug causing fsync failure.
How to reproduce
Transaction commit (COMMIT statement) when fsync() fails.
trigger — this will error
trigger — this will error
# Triggered by hardware or filesystem issues during COMMIT # PRAGMA synchronous = FULL forces fsync on every commit
expected output
sqlite3.DatabaseError: disk I/O error
Fix 1
Fix 2
Fix 3
What not to do
✕
Sources
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