Rails - Jul 2005 - No locks available... help wanted!

In a last attempt to solve this rails issue, i keep hitting this error in
whatever i do on the server. It seems to be a locking issue. The server was 
working like a charm before ...

server specs are: debian (almost virgin) + ruby on rails 0.13 + lighttpd + 
fastcgi.

After searching google, I can''t find anything helpful that relates to
the errors
I am getting. I can''t find any reports from others about Ruby (or
filelocking)
problems either.

All obvious thinks like restarting server, deleting /tmp/ruby_sess* etc. is done
without result.

The filesystem is ext3.

Any indication on what may be causing this is greatly appreciated.
Thank you,
Tiele

<snip from production.log>
Processing InscriptionController#new (for 84.194.118.193 at 
Sat Jul 09 16:24:16 UTC 2005)

Parameters: {"action"=>"new",
"controller"=>"inscription"}

Rendering /usr/lib/ruby/gems/1.8/gems/actionpack-1.9.0/lib/action_controller
/templates/scaffolds/layout.rhtml (200 OK)
Completed in 40.27437 (0 reqs/sec) | Rendering: 2.17903 (5%) | DB: 3.97764 (9%) 
[http://mail.jerke.be/inscription/new]

Processing Base#new (for 84.194.118.193 at Sat Jul 09 16:24:57 UTC 2005)
  Parameters: {"action"=>"new",
"controller"=>"inscription"}

Errno::ENOLCK (No locks available - /tmp/ruby_sess.f3af57c120a3fa42):
    /usr/lib/ruby/1.8/pstore.rb:103:in `flock''
    /usr/lib/ruby/1.8/pstore.rb:103:in `transaction''
    /usr/lib/ruby/1.8/cgi/session/pstore.rb:90:in `update''
    /usr/lib/ruby/1.8/cgi/session/pstore.rb:97:in `close''
    /usr/lib/ruby/1.8/cgi/session.rb:330:in `close''
    /usr/lib/ruby/gems/1.8/gems/actionpack-1.9.0/lib/action_controller/
    base.rb:803:in 

`close_session''
    /usr/lib/ruby/gems/1.8/gems/actionpack-1.9.0/lib/action_controller/
    base.rb:349:in `process''
    /usr/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/dispatcher.rb:32:in
`dispatch''
    /usr/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/fcgi_handler.rb:144:in
    `process_request''
    /usr/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/fcgi_handler.rb:64:in
    `process!''
    /usr/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/fcgi_handler.rb:55:in
    `each_cgi''
    /usr/local/lib/site_ruby/1.8/fcgi.rb:597:in `each''
    /usr/local/lib/site_ruby/1.8/fcgi.rb:597:in `each_cgi''
    /usr/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/fcgi_handler.rb:55:in
    `process!''
    /usr/lib/ruby/gems/1.8/gems/rails-0.13.0/lib/fcgi_handler.rb:21:in 
    `process!''
    /home/tieledefr/testrails/public/dispatch.fcgi:24

</snip>

From the man page:

ENOLCK
     The kernel ran out of memory for allocating lock records.

Check if there are any system limits you are hitting. Otherwise, there 
might be a leak in Ruby/Rails somewhere I guess.

thanks -mike