> - exact output from "nginx -V"

Name : nginx Relocations: (not relocatable)
Version : 1.4.4 Vendor: nginx inc.
Release : 1.el6.ngx Build Date: Tue 19 Nov 2013 12:11:15 PM WET
Install Date: Mon 02 Dec 2013 06:33:31 PM WET Build Host: centos6-amd64-ovl.t.nginx.com
Group : System Environment/Daemons Source RPM: nginx-1.4.4-1.el6.ngx.src.rpm
Size : 788337 License: 2-clause BSD-like license
Signature : RSA/SHA1, Tue 19 Nov 2013 01:03:00 PM WET, Key ID abf5bd827bd9bf62
URL : http://nginx.org/
Summary : High performance web server
Description :
nginx [engine x] is an HTTP and reverse proxy server, as well as
a mail proxy server.

Running on CentOS 6.4. Same happens with 1.4.3 (I've tested a downgrade).

> - do use any nginx modules?

No. Plain upstream vanilla.

> - do you use any third party modules?

No. Upstream binary distribution package (rpm)

> - can post and explain your configuration (at least partially)?

NGINX is a reverse proxy for a vhosted tomcat with openSSL. What tokens from the configuration do you require?

> - you said you can provide cores, can you post a backtrace?

I'm going to attach nginx master process to gdb and check it out. I can't really attach to workers since they segfault quite fast.

> - some details about the underlying OS (virtualization,
>   cpu/ram/architecture/nic/kernel releases)?

CentOS 6.4 (full updated) - running on vmware 5.1u1 - 4vcpu's, 6GB RAM, etc...
[root@iweb-as2 ~]# uname -a
Linux XXXXXXXXXXXX 2.6.32-358.23.2.el6.x86_64 #1 SMP Wed Oct 16 18:37:12 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux