Hi expert,

I am running into nginx core dump issue and I need expert's help.
Thank you so much!

We are running nginx 1.6.0 + mod_security on RHEL 6.4.
We are using the two ports with https.

■core dump
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6_4.1)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
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and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
http://www.gnu.org/software/gdb/bugs/...
Reading symbols from /usr/sbin/nginx.debug...done.

warning: core file may not match specified executable file.
[New Thread 28081]
Missing separate debuginfo for
Try: yum --disablerepo='*' --enablerepo='*-debug*' install /usr/lib/debug/.build-id/a6/993d9af0d108bfc4a2bbfdb176ea3288f6fd5c
#0 ngx_http_chunked_body_filter (r=0x1811350, in=<value optimized out>) at src/http/modules/ngx_http_chunked_filter_module.c:126
126 size += ngx_buf_size(cl->buf);
Missing separate debuginfos, use: debuginfo-install apr-1.3.9-5.el6_2.x86_64 apr-util-1.3.9-3.el6_0.1.x86_64 cyrus-sasl-lib-2.1.23-13.el6_3.1.x86_64 db4-4.7.25-17.el6.x86_64 db4-4.7.25-18.el6_4.x86_64 expat-2.0.1-11.el6_2.x86_64 glibc-2.12-1.107.el6.x86_64 glibc-2.12-1.132.el6.x86_64 keyutils-libs-1.4-4.el6.x86_64 krb5-libs-1.10.3-10.el6.x86_64 krb5-libs-1.10.3-10.el6_4.6.x86_64 libcom_err-1.41.12-14.el6.x86_64 libcom_err-1.41.12-18.el6.x86_64 libcurl-7.19.7-35.el6.x86_64 libcurl-7.19.7-37.el6_4.x86_64 libidn-1.18-2.el6.x86_64 libselinux-2.0.94-5.3.el6.x86_64 libselinux-2.0.94-5.3.el6_4.1.x86_64 libssh2-1.4.2-1.el6.x86_64 libuuid-2.17.2-12.14.el6.x86_64 libxml2-2.7.6-14.el6.x86_64 libxml2-2.7.6-8.el6_3.4.x86_64 nspr-4.10.2-1.el6_5.x86_64 nspr-4.9.2-1.el6.x86_64 nss-3.14.0.0-12.el6.x86_64 nss-3.15.3-3.el6_5.x86_64 nss-softokn-freebl-3.12.9-11.el6.x86_64 nss-softokn-freebl-3.14.3-9.el6.x86_64 nss-util-3.14.0.0-2.el6.x86_64 nss-util-3.15.3-1.el6_5.x86_64 openldap-2.4.23-32.el6_4.1.x86_64 openssl-1.0.0-27.el6.x86_64 openssl-1.0.1e-16.el6_5.1.x86_64 pcre-7.8-6.el6.x86_64 zlib-1.2.3-29.el6.x86_64
(gdb) bt
#0 ngx_http_chunked_body_filter (r=0x1811350, in=<value optimized out>) at src/http/modules/ngx_http_chunked_filter_module.c:126
#1 0x0000000000463114 in ngx_http_gzip_body_filter (r=0x1811350, in=0x2171b38) at src/http/modules/ngx_http_gzip_filter_module.c:325
#2 0x00000000004665cc in ngx_http_ssi_body_filter (r=<value optimized out>, in=<value optimized out>) at src/http/modules/ngx_http_ssi_filter_module.c:444
#3 0x0000000000469c73 in ngx_http_charset_body_filter (r=0x1811350, in=<value optimized out>) at src/http/modules/ngx_http_charset_filter_module.c:643
#4 0x000000000046b5cf in ngx_http_addition_body_filter (r=0x1811350, in=0x2171b38) at src/http/modules/ngx_http_addition_filter_module.c:166
#5 0x000000000046be2c in ngx_http_gunzip_body_filter (r=0x1811350, in=0x2171b38) at src/http/modules/ngx_http_gunzip_filter_module.c:184
#6 0x000000000049b83e in ngx_http_modsecurity_body_filter (r=<value optimized out>, in=<value optimized out>)
at /home/odnsys777/rpmbuild/BUILD/nginx-1.6.0/modsecurity-2.8.0/nginx/modsecurity/ngx_http_modsecurity.c:1209
#7 0x000000000040fd81 in ngx_output_chain (ctx=0x21717c0, in=0x7fff6190f850) at src/core/ngx_output_chain.c:66
#8 0x0000000000449f25 in ngx_http_copy_filter (r=0x1811350, in=0x7fff6190f850) at src/http/ngx_http_copy_filter_module.c:143
#9 0x000000000045d686 in ngx_http_range_body_filter (r=0x1811350, in=0x7fff6190f850) at src/http/modules/ngx_http_range_filter_module.c:594
#10 0x000000000043b0b5 in ngx_http_output_filter (r=0x1811350, in=0x7fff6190f850) at src/http/ngx_http_core_module.c:1964
#11 0x00000000004410fd in ngx_http_send_special (r=0x1811350, flags=<value optimized out>) at src/http/ngx_http_request.c:3332
#12 0x0000000000454a9d in ngx_http_upstream_finalize_request (r=0x1811350, u=0x2127ee0, rc=0) at src/http/ngx_http_upstream.c:3551
#13 0x000000000045551d in ngx_http_upstream_process_request (r=0x1811350) at src/http/ngx_http_upstream.c:3159
#14 0x0000000000459e69 in ngx_http_upstream_send_response (r=0x1811350, u=0x2127ee0) at src/http/ngx_http_upstream.c:2493
#15 ngx_http_upstream_process_header (r=0x1811350, u=0x2127ee0) at src/http/ngx_http_upstream.c:1735
#16 0x000000000045517d in ngx_http_upstream_handler (ev=0x2139a38) at src/http/ngx_http_upstream.c:977
#17 0x0000000000425194 in ngx_event_process_posted (cycle=0x1804f80, posted=0x76ed40) at src/event/ngx_event_posted.c:40
#18 0x000000000042c2b5 in ngx_worker_process_cycle (cycle=0x1804f80, data=<value optimized out>) at src/os/unix/ngx_process_cycle.c:816
#19 0x000000000042a784 in ngx_spawn_process (cycle=0x1804f80, proc=0x42c1e0 <ngx_worker_process_cycle>, data=0x1, name=0x4e5356 "worker process", respawn=-3)
at src/os/unix/ngx_process.c:198
#20 0x000000000042c44c in ngx_start_worker_processes (cycle=0x1804f80, n=4, type=-3) at src/os/unix/ngx_process_cycle.c:364
#21 0x000000000042cc74 in ngx_master_process_cycle (cycle=0x1804f80) at src/os/unix/ngx_process_cycle.c:136
#22 0x000000000040c4c6 in main (argc=<value optimized out>, argv=<value optimized out>) at src/core/nginx.c:407
(gdb)