nginx segfault around ~600 requests per second (reverse proxy)

[yomuppet]

Hello,

I have noticed that we seem to consistently get an nginx segault when reaching around 600 requests per second (reverse proxy).

Here is the nginx build information:
$ nginx -V
nginx version: nginx/0.8.29
built by gcc 4.1.2 20080704 (Red Hat 4.1.2-44)
TLS SNI support disabled
configure arguments: --add-module=../agentzh-chunkin-nginx-module-cb610a5 --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_gzip_static_module --with-http_stub_status_module --with-http_perl_module

Here is the segfault information: 
Jan 17 12:51:31 util1 kernel: nginx[27888]: segfault at 0000000000000008 rip 0000000000429061 rsp 00007fffcc260500 error 6
Jan 24 16:21:33 util1 kernel: nginx[3835]: segfault at 0000000000000008 rip 0000000000429061 rsp 00007fffcc260550 error 6
Jan 24 16:22:24 util1 kernel: nginx[8956]: segfault at 0000000000000008 rip 0000000000429061 rsp 00007fffcc260550 error 6
Jan 24 16:22:26 util1 kernel: nginx[8982]: segfault at 0000000000000008 rip 0000000000429061 rsp 00007fffcc260550 error 6
Jan 24 16:22:27 util1 kernel: nginx[9026]: segfault at 0000000000000008 rip 0000000000429061 rsp 00007fffcc260550 error 6

Does anyone know why this might be occurring, or any helpful information we can provide to better track it down?

Thanks very much in advance.

J

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,45615,45615#msg-45615