Re: Bus Error with Unicorn 6.0 on OpenBSD/adJ 6.8 with Ruby 3.0

[Jeremy Evans <code@jeremyevans.net>]

On 04/04 07:06, vtamara wrote:
> Hi
> 
> Thank you very much for the reply and the interest in helping.
> 
> > vtamara: did previous versions of Ruby, unicorn, or OpenBSD work
> > for your app?
> 
> The application was working withouth issue on OpenBSD/adJ amd64 6.7, ruby
> 2.7 and unicorn 6.0.  So there is something in conflict betweeen Unicorn 6.0
> with OpenBSD/adJ 6.8 and ruby 3.0.
> 
> > Is preload_app in use?  If so, does the problem manifest without
> > preload_app?
> 
> No
> 
> > Are you using Ractor or any other new/experimental stuff
> > in Ruby?
> 
> No
> 
> > Can you reproduce the problem with a simple "hello world"-style app?
> 
> I don't have a hello world example at hand, but some projects that present
> this problem when I run them on OpenBSD/adJ amd64 6.8, nginx 1.18.0, node
> 12.16.1, PostgreSQL 13.2, Ruby 3.0, Rails 6.1 and Unicorn 6.0 are:
> 
> https://github.com/pasosdeJesus/cor1440
> https://github.com/pasosdeJesus/cor1440_pdJ
> https://github.com/pasosdeJesus/sivel2
> https://github.com/pasosdeJesus/si_anzorc
> https://github.com/pasosdeJesus/si_asom
> https://github.com/pasosdeJesus/si_codacop
> https://github.com/pasosdeJesus/sivel2_mujeresindigenas/

Unfortunately, given the required amount of setup, I don't think I'll
have time to look into this.  The best way to debug this is to start
removing code/dependencies piece by piece until the problem goes away.
Once the problem goes away, add that code back, and make sure it fails
again, then start removing other code/dependencies.  Repeat this process
until you have the most minimal example, where removing any additional
code/dependencies will stop the code from failing.

Sorry,
Jeremy

> 
> The simplest of them is https://github.com/pasosdeJesus/cor1440, althoug it
> requires:
> * PostgreSQL
> * nginx
> * nodejs
> * yarn. I install it with: doas pkg_add bash; ftp -o-
> https://yarnpkg.com/install.sh | bash
> * A directory /var/www/bundler/ruby/3.0 where I install the gems with the
> permissions of a user (not root) that runs the application, and better
> running:
>   bundle config path /var/www/bundler/.
> * unicorn installed globally with:
>   doas gem install unicorn
>   doas ln -s /usr/local/bin/unicorn_rails30 /usr/local/bin/unicorn
> 
> To create the PostgreSQL user (in the following example sipdes) and a
> database for the production environment  (in the following example
> cor1440gen_pro):
> 
>   doas su - _postgresql
>   createuser -h /var/www/var/run/postgresql/ -U postgres -s sipdes
>   createdb -h /var/www/var/run/postgresql/ -U postgres -O sipdes
> cor1440gen_pro
>   psql -h /var/www/var/run/postgresql/ -U postgres
>   postgres=# alter user sipdes with password 'xyz';
>   postgres=# \q
>   exit
> 
> With nginx suppossng I will run the application in localhost over SSL, what
> I do is to choose an unused port (let's say 2009) and add to the
> /etc/nginx/nginx.conf configuration in its http block:
> 
>  upstream unicorncor1440 {
> 	  server 127.0.0.1:2009 fail_timeout=0;
>   }
> 
> I also add a server block inside the http block with:
> 
>   server {
>       listen 443 ssl;
>       ssl_certificate /etc/ssl/server.crt;
>       ssl_certificate_key /etc/ssl/private/server.key;
>       root /var/www/htdocs/cor1440/;
>       server_name 127.0.0.1;
>       error_log logs/cor1440.rror.log;
> 
>       location /cor1440 {
>         try_files $uri @unicorncor1440;
>       }
> 
>       location @unicorncor1440 {
>         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
>         proxy_set_header X-Forwarded-Proto $scheme;
>         proxy_set_header Host $http_host;
>         proxy_redirect off;
>         proxy_pass http://unicorncor1440;
>         error_page 500 502 503 504 /500.html;
>         keepalive_timeout 10;
>       }
> 
>       location ^~ /cor1440/assets/ {
>         gzip_static on;
>         expires max;
>         add_header Cache-Control public;
>         root /var/www/htdocs/cor1440/public/;
>       }
> 
>       location ^~ /cor1440/images/ {
>         gzip_static on;
>         expires max;
>         add_header Cache-Control public;
>         root /var/www/htdocs/cor1440/public/;
>       }
> 
>       location ^~ /cor1440/packs/ {
>         gzip_static on;
>         add_header Cache-Control public;
>         root /var/www/htdocs/cor1440/public/;
>       }
>     }
> 
> And restarted nginx:
> 
>   doas rcctl restart nginx
> 
> Then to configure:
> 
>   cd /tmp
>   git clone git@github.com:pasosdeJesus/cor1440
>   doas mv cor1440 /var/www/htdocs/
>   doas chown -R $USER:$USER /var/www/htdocs/cor1440
>   cd /var/www/htdocs/cor1440
>   mkdir .bundle
>   echo '---' > .bundle/config
>   echo 'BUNDLE_PATH: "/var/www/bundler"' >> .bundle/config
>   echo 'BUNDLE_DISABLE_SHARED_GEMS: "true"' >> .bundle/config
>   bundle
> 
> Here some gems will require installing with special permissions for example:
> 
>   doas gem install --install-dir /var/www/bundler/ruby/3.0 unicorn
> 
> Other gems that will require this kind of installation will be:
>   racc nio4r websocket-driver bcrypt bindex msgpack ffi redcarpet kgio
> libxml-ruby pg
>   nokogiri bootsnap puma sassc
> 
> Once bundle runs completely:
> 
>   cp .env.plantilla .env
>   vi .env
> 
> There I set the variables:
> * BD_USUARIO with the database user,
> * BD_CLAVE with the password
> * BD_PRO with the name of the production database
> * CONFIG_HOSTS=127.0.0.1
> * DIRAP with the path to the application
> * RAILS_ENV=production
> * PUERTOUNICORN with the port I choosed and set in nginx.conf
> * USUARIO_AP with the operating system user who will run the application
> 
> Prepare credentials and database:
> 
>   bin/rails credentials:edit
>   RAILS_ENV=production bin/rails credentials:edit
>   bin/railsp db:setup  db:migrate sip:indices
> 
> Precompile assets:
> 
>   CXX=c++ yarn
>   doas ln -s /usr/local/bin/node /tmp  # To overcome bug of node with rails
> on OpenBSD
>   bin/railsp assets:precompile
> 
> Run the application with:
>   SECRET_KEY_BASE=cf46 DIRAP=/var/www/htdocs/cor1440/ bin/u.sh
> 
> Trying to see the application running with a browser in
> https://127.0.0.1/cor1440 will produce the errors described in
> log/unicorn.log.
> 
> Blessings. Thank you.
> 
> El 2021-03-30 00:00, Jeremy Evans escribi??:
> > On 03/30 01:58, Eric Wong wrote:
> > > vtamara <vtamara@pasosdeJesus.org> wrote:
> > > > Hi
> > > >
> > > > Launching a rails application with Ruby 3, Unicorn 6 on OpenBSD/adJ 6.8, I'm
> > > > experiencing a lot of "Bus Error" and "Segmentation Faults" during
> > > > aproximately half hour.
> > > 
> > > +Cc: Jeremy Evans, who is more familiar with OpenBSD and Ruby 3.0
> > > than I
> > > cf. https://yhbt.net/unicorn-public/6acb1c84c7392d7b4a64572b20498549@pasosdeJesus.org/
> > 
> > I'll be happy to look into this if a minimal self-contained reproducible
> > example is posted.  Personally, I run my Ruby apps on OpenBSD amd64 with
> > Unicorn, and haven't seen similar errors.  However, I don't use
> > preload_app and use fairly minimal dependencies.
> > 
> > Thanks,
> > Jeremy
> 
> -- 
> Dios, gracias por tu amor infinito.
> --
>   Vladimir T??mara Pati??o.  http://vtamara.pasosdeJesus.org/
>   http://www.pasosdejesus.org/dominio_publico_colombia.html