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Bug #16277

open

UNIXServer#listen fails with Errno::EADDRINUSE error under Windows 10 / WSL Ubuntu 18.04

Added by bradland (Brad Landers) over 2 years ago. Updated over 2 years ago.

Status:
Open
Priority:
Normal
Assignee:
-
Target version:
-
ruby -v:
ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux-gnu]
[ruby-core:95515]

Description

When running the following script under Windows 10 / WSL Ubuntu 18.04, an Errno::EADDRINUSE error is thrown. Expected result is that the script would run and simply exit.

#!/usr/bin/env ruby

# This script establishes a UNIX server socket.
# 
# Expected result: Script should run and immediately exit.
# 
# Actual result: Script fails with Errno::EADDRINUSE error.
# 
# Environment: Windows 10 Pro, WSL, Ubuntu 18.04.2, ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-linux-gnu]
# 
# To reproduce: Create a tmp folder, copy this script there, and execute.

require 'socket'

path = File.expand_path('listen.sock')
backlog = 5

s = UNIXServer.new(path)
if backlog
  s.listen backlog
else
  s.listen
end

File.delete(path) if File.exists?(path)

The bug was discoverd as part of Puma (gem) issue #1521: https://github.com/puma/puma/issues/1521.

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