Building ngx_stream_socks_module as a dynamic module with --add-dynamic-module= causes segfaults

[muravjov]

Having a simple config like

load_module modules/ngx_stream_module.so;
load_module modules/ngx_stream_socks_module.so;

events {
}

stream {
}

I get segfaults:

$ sudo objs/nginx -t -c /home/sa/nginx_build/socks-nginx.conf
qemu: uncaught target signal 11 (Segmentation fault) - core dumped

How to reproduce:

• ubuntu 22.04.1
• the config:

$ sudo objs/nginx -V
nginx version: nginx/1.18.0 (Ubuntu)
built with OpenSSL 3.0.2 15 Mar 2022
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -ffile-prefix-map=/home/sa/nginx_build/nginx-1.18.0=. -flto=auto -ffat-lto-objects -flto=auto -ffat-lto-objects -fstack-protector-strong -Wformat -Werror=format-security -fPIC -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-Bsymbolic-functions -flto=auto -ffat-lto-objects -flto=auto -Wl,-z,relro -Wl,-z,now -fPIC' --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 --modules-path=/usr/lib/nginx/modules --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-compat --with-debug --with-pcre-jit --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-geoip2 --with-http_addition_module --with-http_flv_module --with-http_geoip_module=dynamic --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_mp4_module --with-http_perl_module=dynamic --with-http_random_index_module --with-http_secure_link_module --with-http_sub_module --with-http_xslt_module=dynamic --with-mail=dynamic --with-mail_ssl_module --with-stream=dynamic --with-stream_geoip_module=dynamic --with-stream_ssl_module --with-stream_ssl_preread_module --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-headers-more-filter --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-auth-pam --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-cache-purge --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-dav-ext --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-ndk --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-echo --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-fancyindex --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/nchan --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/rtmp --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-uploadprogress --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-upstream-fair --add-dynamic-module=/home/sa/nginx_build/nginx-1.18.0/debian/modules/http-subs-filter --add-dynamic-module=/home/sa/nginx_build/ngx_stream_socks_module

The nginx is built from the ubuntu official repo with

# get sources
$ apt-get source nginx

# add github.com/attenuation/ngx_stream_socks_module to configure
$ sed -i 's+/http-subs-filter+/http-subs-filter --add-dynamic-module=/home/sa/nginx_build/ngx_stream_socks_module+g' debian/rules

# build it
$ debian/rules build

# the result .so
$ ls -lah debian/build-extras/objs/ngx_stream_socks_module.so
-rwxrwxr-x 1 sa sa 124K Feb 28 03:34 debian/build-extras/objs/ngx_stream_socks_module.so

The ngx_stream_socks_module commit is used:

$ git log -1
commit acf31be0a046edf42518958b7a322e5367734761 (HEAD -> main, tag: 0.1.0, tag: 0.1, origin/main, origin/HEAD)
Author: Jun Ouyang <[email protected]>
Date:   Mon Jan 9 22:43:41 2023 +0800

    update readme