CouchDB hangs up and uses 100 % CPU under nginx reverse proxy

[deepj]

Hi,
I'm trying to use CouchDB under nginx reverse proxy and its behavior is 
very strange. When I ran the test suite it started to use 100 % for any 
time. If I don't use nginx reverse proxy and I run the test suite 
CouchDB doesn't use 100 %. Everything seems to be OK. :(

Only one test fails:
uuids -> Assertion failed: currentTime - dateHeader < 3000
(Don't you know where the issue is? This test is test success on local)

Ubuntu 9.04 (32-bit)
Erlang 5.6.5
Nginx 0.6.36

CouchDB configuration is default.

I think the issue is not in nginx but here is my nginx configuration:
Domain configuration is the following:

server {
   listen      80;
   server_name couchdb.example.eu;

   location / {
     proxy_pass        http://localhost:5984;
     proxy_redirect    off;
     proxy_set_header  X-Real-IP  $remote_addr;
     proxy_set_header  Host  $host;
     proxy_set_header  X-Forwarded-For $proxy_add_x_forwarded_for;
   }
}

Main nginx configuration  is the following:
worker_processes 2;

pid /usr/local/var/run/nginx.pid;

events {
    worker_connections  2048;
}

http {
    passenger_root /usr/local/lib/ruby/gems/1.9.1/gems/passenger-2.2.1;
    passenger_ruby /usr/local/bin/ruby;

    include       mime.types;
    default_type  application/octet-stream;

    log_format  main  '$remote_addr - $remote_user [$time_local] $request '
                      '"$status" $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

    access_log  /usr/local/var/log/nginx/access.log  main;

    sendfile       on;

    tcp_nopush     on;
    tcp_nodelay    on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    include /etc/nginx/*.conf;
}