Broken pipe

The root error Broken pipe occurs when a process tries to write data to a pipe, socket, or stream that has already been closed on the receiving end. This error is common across Linux, macOS, Unix systems, and also appears in Java applications, Docker containers, network services, and server-side software that relies on inter-process or network communication.

When does this error occur?

  • A process writes to a pipe after the reading process has exited
  • A network client sends data after the server closes the connection
  • A Java or application server writes to a closed socket
  • A Docker container stops while another process is still sending output
  • A script pipes output to a command that terminates early

Root cause of Broken pipe

At the operating system level, Broken pipe is raised when a write operation targets a communication channel whose receiving endpoint no longer exists. The OS kernel detects that the pipe or socket has been closed and sends a SIGPIPE signal or write failure to the sending process.

How to fix the error (step-by-step)

Linux / macOS

Ensure the receiving process is still running before writing data. 

ps aux | grep <process-name>

Avoid writing indefinitely to piped commands that may exit early. 

command1 | command2 || true

Handle SIGPIPE explicitly in scripts or applications. 

trap "" PIPE

Java / Spring Boot

Check if the socket or output stream is still open before writing. 

if (!socket.isClosed()) {
    outputStream.write(data);
}

Ensure proper connection lifecycle management and graceful shutdown.

Docker / containers

Verify the container receiving data is running. 

docker ps

Avoid logging or streaming to containers that are stopping or restarting.

Verify the fix

After applying the fix, rerun the operation and confirm that the sender no longer terminates unexpectedly. The process should continue writing without receiving a SIGPIPE signal, and logs or network transmissions should complete successfully.

Common mistakes to avoid

  • Ignoring process exit status in pipelines
  • Assuming network connections stay open indefinitely
  • Not handling SIGPIPE in long-running processes
  • Writing to streams after closing them
  • Forcing output to terminated containers or services

Quick tip

Always validate the state of pipes, sockets, and streams before writing data, especially in long-running or distributed systems.

FAQ

Q: Is Broken pipe a network-only error?

A: No. It occurs with pipes, sockets, and any IPC mechanism where the receiver has closed the connection.

Q: Why does Broken pipe terminate my program?

A: Many systems send a SIGPIPE signal by default, which stops the process unless handled.

Conclusion

Broken pipe indicates a closed communication channel; fixing it requires proper lifecycle handling of pipes, sockets, and processes—refer to related ROOT errors on ErrorFixHub for deeper system troubleshooting.

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