<p>MySQL cannot move its file pointer because the underlying fseek() call failed, stopping the current statement.</p>
<p>MySQL Error 1376 ER_FSEEK_FAIL appears when the server cannot reposition a file pointer using fseek(), often due to disk issues or permissions. Check disk health, free space, and file ownership, then restart MySQL to clear the error.</p>
Failed on fseek()
MySQL raises error 1376 (ER_FSEEK_FAIL) with the message Failed on fseek() when an internal fseek() system call fails while the server is reading or writing a file.
The issue stops the current SQL statement because MySQL can no longer trust file offsets. It commonly affects MyISAM data or index files, general logs, or binary logs.
Disk hardware problems, full partitions, or file descriptor exhaustion often make fseek() fail. Incorrect file permissions or SELinux policies can also block MySQL from moving the file pointer.
On some operating systems, large files or 32-bit filesystem limits trigger the error when MySQL tries to seek past 2 GB.
First check disk health and free space with native OS tools. Repair corrupted MyISAM tables using myisamchk or the REPAIR TABLE command.
If the error appears in log files, rotate or truncate the log after stopping MySQL and confirm correct ownership and permissions before restarting the service.
When running ALTER TABLE on a MyISAM table, the error often signals a damaged .MYD file. Restoring from backup or running myisamchk --recover usually resolves the issue.
During replication, ER_FSEEK_FAIL on the relay log means the replica cannot read the file. Empty the relay log, re-sync from the master, and monitor disk SMART data.
Keep disks below 80 percent capacity and enable automated log rotation. Use InnoDB where possible because it handles I/O errors more gracefully than MyISAM.
Monitor dmesg and MySQL error logs for early file I/O warnings, and configure MySQL to write logs to reliable storage with correct fsync settings.
Error 126 (ER_OUT_OF_FILE) arises when MySQL cannot allocate a file handle. It differs because fseek() has not yet been called.
Error 1025 occurs during ALTER TABLE rename failures and may appear alongside ER_FSEEK_FAIL when the underlying filesystem is unreliable.
When the partition holding the table or log files reaches 100 percent usage, fseek() cannot allocate new offsets and returns an error.
Bad sectors or corrupted inode tables prevent the kernel from moving the file pointer, triggering ER_FSEEK_FAIL.
If mysql cannot access files due to chmod or chown mistakes, fseek() calls fail immediately.
Seeking beyond 2 GB on older kernels or 32-bit builds returns an invalid argument error to MySQL.
Occurs when MySQL cannot open or create a file. Often precedes ER_FSEEK_FAIL when the server exhausts file descriptors.
Appears when writes are blocked at the server level rather than the filesystem.
Arises during ALTER TABLE operations when the underlying filesystem cannot execute file moves or seeks.
No. The error indicates underlying disk or permission problems that will likely cause data loss if left unresolved.
InnoDB reduces but does not eliminate I/O errors. It has crash-safe design, but disk failure can still stop the server.
Not always. Investigate quickly. If myisamchk or InnoDB recovery shows no damage, data may be intact.
Galaxy surfaces real-time error logs in the editor, making disk I/O failures immediately visible so engineers can act before corruption occurs.
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