nginx застывает от ab теста (nginx freezes under ab test)

[zzox4]

$ ab -n 10000 -c 100 http://example.com/test
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking example.com (be patient)
Completed 1000 requests
Completed 2000 requests
Completed 3000 requests
Completed 4000 requests
Completed 5000 requests
apr_poll: The timeout specified has expired (70007)
Total of 5605 requests completed

При этом другие сайты на этом сервере перестают работать (after that other
sites don't work)
server {
    listen   80;
    server_name example.com;
    location ~ /test {
        echo "hello world";
    }
}

example.com - локальный хост
$ ping example.com
PING localhost (127.0.0.1) 56(84) bytes of data.
64 bytes from localhost (127.0.0.1): icmp_req=1 ttl=64 time=0.042 ms

iostat/top - показывает что нагрузки нет, сервер простаивает, это нода
digital ocean.

$ nginx -V
nginx version: nginx/1.6.0
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fstack-protector
--param=ssp-buffer-size=4 -Wformat -Wformat-security -Werror=format-security
-D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -Wl,-z,relro'
--prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf
--http-log-path=/var/log/nginx/access.log
--error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock
--pid-path=/run/nginx.pid --http-client-body-temp-path=/var/lib/nginx/body
--http-fastcgi-temp-path=/var/lib/nginx/fastcgi
--http-proxy-temp-path=/var/lib/nginx/proxy
--http-scgi-temp-path=/var/lib/nginx/scgi
--http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit
--with-ipv6 --with-http_ssl_module --with-http_stub_status_module
--with-http_realip_module --with-http_auth_request_module
--with-http_addition_module --with-http_dav_module --with-http_geoip_module
--with-http_gzip_static_module --with-http_image_filter_module
--with-http_spdy_module --with-http_sub_module --with-http_xslt_module
--with-mail --with-mail_ssl_module
--add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-auth-pam
--add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-dav-ext-module
--add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-echo
--add-module=/build/buildd/nginx-1.6.0/debian/modules/nginx-upstream-fair
--add-module=/build/buildd/nginx-1.6.0/debian/modules/ngx_http_substitutions_filter_module


Это бага nginx или что?

Posted at Nginx Forum: http://forum.nginx.org/read.php?21,251212,251212#msg-251212