Fastcgi_cache_purge line in config causes segmentation fault since 1.7.8 in nginx-extras

Hello;

for many months I’ve been running the config shown here:
https://rtcamp.com/wordpress-nginx/tutorials/single-site/fastcgi-cache-with-purging/

This morning, I apt-get upgraded and got nginx 1.7.8 and a load of dead
sites. running nginx -t gave me a segmentation fault (core dumped)
error.

After a whole load of panicking and commenting one line out at a time, I
finally tracked it down to this section:

location ~ /purge(/.*) {
fastcgi_cache_purge WORDPRESS “$scheme$request_method$host$1”;
}

If I comment that out, I can start up wordpress and nginx -t doesn’t
core
dump.

I can’t see anything obvious in the release notes that would cause this,
server details are below:

Linux 3.16.0-28-generic #37-Ubuntu SMP Mon Dec 8 17:22:00 UTC 2014 i686
i686
i686 GNU/Linux

nginx version: nginx/1.7.8
TLS SNI support enabled
configure arguments: --with-cc-opt=’-g -O2 -fstack-protector-strong
-Wformat
-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_flv_module
–with-http_geoip_module --with-http_gzip_static_module
–with-http_image_filter_module --with-http_mp4_module
–with-http_perl_module --with-http_random_index_module
–with-http_secure_link_module --with-http_spdy_module
–with-http_sub_module --with-http_xslt_module --with-mail
–with-mail_ssl_module
–add-module=/build/buildd/nginx-1.7.8/debian/modules/headers-more-nginx-module
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-auth-pam
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-cache-purge
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-dav-ext-module
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-development-kit
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-echo
–add-module=/build/buildd/nginx-1.7.8/debian/modules/ngx-fancyindex
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-http-push
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-lua
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-upload-progress
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-upstream-fair
–add-module=/build/buildd/nginx-1.7.8/debian/modules/ngx_http_substitutions_filter_module

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,255522,255522#msg-255522

On Tuesday 16 December 2014 05:36:38 talkingnews wrote:

location ~ /purge(/.*) {
fastcgi_cache_purge WORDPRESS “$scheme$request_method$host$1”;
}

If I comment that out, I can start up wordpress and nginx -t doesn’t core
dump.

I can’t see anything obvious in the release notes that would cause this,
[…]

https://github.com/FRiCKLE/ngx_cache_purge/blob/master/CHANGES

Since you’re using a lot of 3rd-party modules it’s a good idea to
update them too.

wbr, Valentin V. Bartenev

Valentin V. Bartenev Wrote:

https://github.com/FRiCKLE/ngx_cache_purge/blob/master/CHANGES

Since you’re using a lot of 3rd-party modules it’s a good idea to
update them too.

Not sure how I can do this when I’m using
http://ppa.launchpad.net/nginx/development/ubuntu utopic main

As far as I can see, the nginx-extras package was built 15 hours ago.
From the link you posted:

2014-12-02 VERSION 2.2
* Fix compatibility with nginx-1.7.8+.

From nginx -V
–add-module=/build/buildd/nginx-1.7.8/debian/modules/nginx-cache-purge

So, it SHOULD be up to date. It sounds like I need to post a ticket on
github - so I just have!
https://github.com/FRiCKLE/ngx_cache_purge/issues/25

Thanks

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,255522,255524#msg-255524

For anyone following this, I had a reply on the repo bug ticket saying:

I just downloaded nginx_1.7.8-1+utopic1.debian.tar.gz sources from PPA and
it looks that unfortunately it doesn’t use the latest version of the
module.
Please contact PPA package maintainer (teward) and ask him to update it.

So, I’ve just done that - I’ll let you know what the outcome is -
thanks!

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,255522,255526#msg-255526

Right, sorted! https://bugs.launchpad.net/bugs/1403054

New nginx-extras mainline is now available to fix the bug - my good deed
for
the day :slight_smile:

Posted at Nginx Forum:
http://forum.nginx.org/read.php?2,255522,255534#msg-255534