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Linux Error EMFILE (errno 24) — Too Many Open Files Fix

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About Linux Error EMFILE (errno 24)

Linux errno 24 EMFILE means the process has reached its open file descriptor limit. This guide covers everything you need to know about this topic, including common causes, step-by-step solutions, and answers to frequently asked questions.

Here are the key things to understand: Error: EMFILE (errno 24). Message: Too many open files. Process file descriptor limit reached. Common in high-traffic servers. Understanding these fundamentals will help you diagnose and resolve this issue more effectively.

The most common reasons this occurs include: Application not closing file handles. Default ulimit too low (often 1024). Socket connections counted as file descriptors. File descriptor leak in application code. Identifying the root cause is the first step toward finding the right solution.

To resolve this, follow these recommended steps: Check current limit: ulimit -n. Increase limit: ulimit -n 65536. Permanent fix: edit /etc/security/limits.conf. Find open files: lsof -p PID | wc -l. Fix application file descriptor leaks. If these steps do not resolve the issue, consider consulting additional resources or a qualified professional.

This article is part of our Linux Error Codes collection on Error Codes Wiki. We provide comprehensive, up-to-date information to help you find solutions quickly.

Quick Answer

How many files can a process open?

Default is often 1024. Production servers should set 65536+.

Overview

Linux errno 24 EMFILE means the process has reached its open file descriptor limit.

Key Details

  • Error: EMFILE (errno 24)
  • Message: Too many open files
  • Process file descriptor limit reached
  • Common in high-traffic servers

Common Causes

  • Application not closing file handles
  • Default ulimit too low (often 1024)
  • Socket connections counted as file descriptors
  • File descriptor leak in application code

Steps

  1. 1Check current limit: ulimit -n
  2. 2Increase limit: ulimit -n 65536
  3. 3Permanent fix: edit /etc/security/limits.conf
  4. 4Find open files: lsof -p PID | wc -l
  5. 5Fix application file descriptor leaks

Tags

linuxlinux-errnolinux errno 24ubuntuterminal

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Frequently Asked Questions

Default is often 1024. Production servers should set 65536+.