Exception `Errno::EAGAIN'

James Turnbull james at lovedthanlost.net
Sun Nov 15 18:21:34 EST 2009


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I get this repeated error - about once a second:

Exception `Errno::EAGAIN' at
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:643 -
Resource temporarily unavailable - accept(2)
Exception `Errno::EAGAIN' at
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:643 -
Resource temporarily unavailable - accept(2)
Exception `Errno::EAGAIN' at
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:643 -
Resource temporarily unavailable - accept(2)

Which seems to be related to:

        ready.each do |sock|
          begin
            process_client(sock.accept_nonblock)
            nr += 1
            alive.chmod(m = 0 == m ? 1 : 0)
          rescue Errno::EAGAIN, Errno::ECONNABORTED
          end
          break if nr < 0
        end

My unicorn.conf is:

worker_processes 4
working_directory "/etc/puppet"
listen '/tmp/puppet.sock', :backlog => 1
listen 8140, :tcp_nopush => true
timeout 10
pid "/tmp/puppet.pid"

  preload_app true
  GC.respond_to?(:copy_on_write_friendly=) and
  GC.copy_on_write_friendly = true

  before_fork do |server, worker|
    # the following is recomended for Rails + "preload_app true"
    # as there's no need for the master process to hold a connection
#    defined?(ActiveRecord::Base) and
#      ActiveRecord::Base.connection.disconnect!

    # the following allows a new master process to incrementally
    # phase out the old master process with SIGTTOU to avoid a
    # thundering herd (especially in the "preload_app false" case)
    # when doing a transparent upgrade.  The last worker spawned
    # will then kill off the old master process with a SIGQUIT.
    old_pid = "#{server.config[:pid]}.oldbin"
    if old_pid != server.pid
      begin
        sig = (worker.nr + 1) >= server.worker_processes ? :QUIT : :TTOU
        Process.kill(sig, File.read(old_pid).to_i)
      rescue Errno::ENOENT, Errno::ESRCH
      end
    end

    # optionally throttle the master from forking too quickly by
sleeping
    sleep 1
  end

The platform is Fedora 10, Ruby 1.8.6.

Oddly, if I comment out the preload I get:

Exception `Errno::EPERM' at
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:639 -
Operation not permitted - /tmp/0.520680132392046
Unhandled listen loop exception #<Errno::EPERM: Operation not
permitted - /tmp/0.520680132392046>.
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:639:in `chmod'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:639:in
`worker_loop'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:534:in
`spawn_missing_workers'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:534:in `fork'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:534:in
`spawn_missing_workers'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:530:in `each'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:530:in
`spawn_missing_workers'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:540:in
`maintain_worker_count'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:215:in `start'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/lib/unicorn.rb:28:in `run'
/usr/lib/ruby/gems/1.8/gems/unicorn-0.95.0/bin/unicorn:165
/usr/bin/unicorn:19:in `load'
/usr/bin/unicorn:19

Repeatedly.

Regards

James Turnbull

- --
Author of:
* Pro Linux System Administration (http://tinyurl.com/linuxadmin)
* Pulling Strings with Puppet (http://tinyurl.com/pupbook)
* Pro Nagios 2.0 (http://tinyurl.com/pronagios)
* Hardening Linux (http://tinyurl.com/hardeninglinux)
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