wsgi issue in 5.0.4

Adam Weremczuk

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Apr 18, 2023, 2:29:23 PM4/18/23

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Hi all,

Trying to install on Debian 11 with Apache2 and MariaDB.

After site installation and apache configuration the html doesn't render and I'm getting:

<!DOCTYPE html>
<html>
<head>
<title>HTTP 500 - Review Board is taking a nap</title>
(...)

Error log:

[Tue Apr 18 18:21:03.923609 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] mod_wsgi (pid=647): Failed to exec Python script file '/var/www/rebo/htdocs/reviewboard.wsgi'.
[Tue Apr 18 18:21:03.923909 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] mod_wsgi (pid=647): Exception occurred processing WSGI script '/var/www/rebo/htdocs/reviewboard.wsgi'.
[Tue Apr 18 18:21:03.924326 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] Traceback (most recent call last):
[Tue Apr 18 18:21:03.924542 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] File "/var/www/rebo/htdocs/reviewboard.wsgi", line 9, in <module>
[Tue Apr 18 18:21:03.924672 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] from reviewboard.wsgi import application
[Tue Apr 18 18:21:03.924810 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] File "/usr/local/lib/python3.9/dist-packages/reviewboard/wsgi.py", line 33, in <module>
[Tue Apr 18 18:21:03.924937 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] application = get_wsgi_application()
[Tue Apr 18 18:21:03.925055 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] File "/usr/local/lib/python3.9/dist-packages/django/core/wsgi.py", line 12, in get_wsgi_application
[Tue Apr 18 18:21:03.925176 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] django.setup(set_prefix=False)
[Tue Apr 18 18:21:03.925309 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] File "/usr/local/lib/python3.9/dist-packages/django/__init__.py", line 24, in setup
[Tue Apr 18 18:21:03.925431 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] apps.populate(settings.INSTALLED_APPS)
[Tue Apr 18 18:21:03.925537 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] File "/usr/local/lib/python3.9/dist-packages/django/apps/registry.py", line 83, in populate
[Tue Apr 18 18:21:03.925646 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] raise RuntimeError("populate() isn't reentrant")
[Tue Apr 18 18:21:03.925794 2023] [wsgi:error] [pid 647:tid 140449104779008] [client 10.200.20.5:55263] RuntimeError: populate() isn't reentrant

It looks like a problem with wsgi.

dpkg -l | grep -i wsgi
ii libapache2-mod-wsgi-py3 4.7.1-3+deb11u1 amd64 Python 3 WSGI adapter module for Apache

How do I fix the error?

Regards,
Adam

Adam Weremczuk

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Apr 18, 2023, 2:33:11 PM4/18/23

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I'm running WSGI in the default embedded mode:

# mod_wsgi Embedded Mode configuration
#
# This default configuration enables Embedded Mode, but you can remove
# this and uncomment Daemon Mode below.
#
# Embedded mode is simpler to configure, but daemon mode is recommended
# in production environments.
WSGIPassAuthorization On
WSGIScriptAlias "/" "/var/www/rebo/htdocs/reviewboard.wsgi"

Laurent Marechal

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Apr 18, 2023, 4:14:42 PM4/18/23

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Hello,

Had a similar issue in the past. The error is kind of generic but in my case it appeared after moving to Python3 for ReviewBoard while Python2 was still the OS installation (thanks old RH).

The root cause was not having the WSI setup correctly. You need to update the wsgi file with:

WSGIDaemonProcess ...
WSGIProcessGroup ...

You need to set them-up in the wsgi that you are using (reviewboard.wsgi I think), the template created by the installation does not contain them.

Note you might get the same error if you try to run multiple wsgi applications on the same http server.

Regards,

Laurent\

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Adam Weremczuk

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Apr 20, 2023, 9:59:00 AM4/20/23

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Hi Laurent,

I have an existing and fully working 3.0.18 site. I've never had to do anything special about WSGI, just "sudo apt install libapache2-mod-wsgi" and copy the template config files.

I've compared 3.0.18 and 5.0.4 and key config files differ significantly (apache-wsgi.conf, reviewboard.wsgi).

What struck me is one apache2 config line:

3.0.18: WSGIScriptAlias "/" "/var/www/rebo.mydomain.com/htdocs/reviewboard.wsgi/"

5.0.4: WSGIScriptAlias "/" "/var/www/rebo.mydomain.com/htdocs/reviewboard.wsgi"

Note the lack of trailing slash in the latter. Unfortunately adding a slash and rebooting hasn't fixed my problem.

Could somebody running 5.0.X on Debian 10 / 11 care to share their working apache2 config and reviewboard.wsgi?

Not sure how much Red Hat version would differ but no harm sharing that as well please.

Regards,
Adam

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Astro Jetson

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May 3, 2023, 4:30:49 PM5/3/23

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I installed on Ubuntu 20.04, Apache + wsgi. I added logging config as described in the Admin Guide. the doc. I had to add 1 line to the generated file

This is my Apache .conf file for a 5.0.3 upgraded to 5.0.4. Note: I configured my site with an rbrd01 prefix. ignore them.

Hope this helps.

VirtualHost *:80>
ServerName dev-rim-rbrd01.perceptive.cloud
DocumentRoot "/var/www/dev-rim-rbrd01.perceptive.cloud/htdocs"

# Log configuration
#
# NOTE: logrotate configuration is in /etc/logrotate.d/dev-rim-rbrd01
ErrorLog /var/www/dev-rim-rbrd01.perceptive.cloud/logs/error.log
CustomLog /var/www/dev-rim-rbrd01.perceptive.cloud/logs/access.log combined

# Error handlers
ErrorDocument 500 /errordocs/500.html

WSGIPassAuthorization On
WSGIScriptAlias "/" "/var/www/dev-rim-rbrd01.perceptive.cloud/htdocs/reviewboard.wsgi"

<Directory "/var/www/dev-rim-rbrd01.perceptive.cloud/htdocs">
AllowOverride All
Options -Indexes +FollowSymLinks
#johnp add nothing works without it.
Require all granted
</Directory>

# Prevent the server from processing or allowing the rendering of
# certain file types.
<Location "/rbrd01/media/uploaded">
SetHandler None
Options None

AddType text/plain .html .htm .shtml .php .php3 .php4 .php5 .phps .asp
AddType text/plain .pl .py .fcgi .cgi .phtml .phtm .pht .jsp .sh .rb

<IfModule mod_php5.c>
php_flag engine off
</IfModule>

# Force all uploaded media files to download.
<IfModule mod_headers.c>
Header set Content-Disposition "attachment"
</IfModule>
</Location>

# Alias static media requests to filesystem
Alias /rbrd01/media "/var/www/dev-rim-rbrd01.perceptive.cloud/htdocs/media"
Alias /rbrd01/static "/var/www/dev-rim-rbrd01.perceptive.cloud/htdocs/static"
Alias /rbrd01/errordocs "/var/www/dev-rim-rbrd01.perceptive.cloud/htdocs/errordocs"
Alias /rbrd01/favicon.ico "/var/www/dev-rim-rbrd01.perceptive.cloud/htdocs/static/rb/images/favicon.png"
</VirtualHost>

Christian Hammond

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May 8, 2023, 8:27:30 PM5/8/23

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Hi Adam,

This is not an error you should be hitting. It's hard to say what may be triggering it, but it does seem environmental (and is before any real Review Board code gets loaded).

Can you verify the version of Python that Review Board is installed with, and the version mod_wsgi is using (it should be in Apache's error_log).

Also, if I could see your $sitedir/htdocs/reviewboard.wsgi, that would help.

Christian

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Subodh Konhor

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May 10, 2023, 2:31:26 AM5/10/23

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As per the error message there is a generic runtime error being thrown "RuntimeError: populate() isn't reentrant"

Check below SO link which helps identify real problem.

https://stackoverflow.com/questions/27093746/django-stops-working-with-runtimeerror-populate-isnt-reentrant/55929118#55929118

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Christian Hammond

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May 11, 2023, 3:20:14 PM5/11/23

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We have a lot of familiarity with this internal layer of Django and the sort of issues that can cause it, but it’s not something that should happen in a typical Review Board setup unless there’s something happening before our initialization code gets to run or if there’s a system packaging issue breaking some part of that initialization.

This will take some investigation involving copies of some files (the aforementioned ones, and some log files and potentially Python package listings).

Under a support contract, we can also send custom builds with additional logging, and gather this information privately, but if anyone affected on the mailing list is in a position to publicly provide these copies of these files, we’ll take a look.

Christian

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Christian Hammond

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May 11, 2023, 3:41:21 PM5/11/23

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To get the list in one place, this set of information will help:

* $sitedir/htdocs/reviewboard.wsgi

* $sitedir/logs/error_log

* $sitedir/logs/reviewboard.log

* Result of `pipX.Y list` (where X.Y corresponds to the version of Python being used by mod_wsgi)

* That Python version number

* The OS and version

* Whether or not any extensions are enabled (and which ones), particularly if there are any third-party or in-house ones enabled.

Also, we can learn a lot from running:

$ rb-site manage $sitedir shell

from reviewboard import initialize

initialize()

If that shows any errors or warnings, seeing those can point us in the right direction.