Opened 5 years ago

Last modified 5 years ago

#24574 closed Bug

python manage.py runserver sleeps forever because of threading lock — at Version 1

Reported by: Krish Owned by: nobody
Component: Migrations Version: 1.7
Severity: Normal Keywords: threading lock, manage.py
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description (last modified by Krish)

I have upgraded Django 1.6 o 1.7.7. I was run my project using 'python manage.py runserver' command. It went well in test server. However, when I tried same in production server, it sleeps forever. Detail Server info is attached below. Doing trackback, I figure out problem, It lies on django.apps.registry.populate function. Trace back steps as follows:

  1. Command line execution starts.
    django.core.management:: utility.execute()
    
  1. It calls application setup process, where it loads enabled Apps
    django.core.management ::jango.setup()
    django.setup:: apps.populate(settings.INSTALLED_APPS)
    
  1. Thread starts threading lock process, so that same application not loaded twice.
    django.apps.registry::with self._lock:
    
  1. It goes through for each app,
    django.apps.registry::app_config.ready()
    ...
    # after many lines of codes
    ...
    for app_config in self.get_app_configs():
    app_config.ready()
    
  2. When it matches <AdminConfig: admin>, it calls to
            django.contrib.admin.apps:: self.module.autodiscover()
            django.contrib.admin:: autodiscover_modules('admin', register_to=site)
    
  3. autodiscover_modules agains calls django.setup(). I don't have full traceback. But it goes like:
            django.core.management ::django.setup()
    
            django.setup::apps.populate(settings.INSTALLED_APPS)
    
            django.apps.registry::with self._lock:
    

Application stuck here in django.apps.registry::with self._lock: line because the threading lock has been already acquired and not released.

Python:
Python 2.7.6 on both server

Dev Server:
Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty
CPU: 2.40GHz x 1
MemTotal: 1017880kb

Production Server:
Distributor ID: Ubuntu
Description: Ubuntu 14.04 LTS
Release: 14.04
Codename: trusty
CPU: 2.00GHz x 24
MemTotal: 4942810

Change History (1)

comment:1 Changed 5 years ago by Krish

Description: modified (diff)
Summary: python manage.py runserver sleeps foreverpython manage.py runserver sleeps forever because of threading lock
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