uWSGI error: "Error opening file for reading: Permission denied'

Discussion in 'HOWTO-Related Questions' started by jrossi90, May 23, 2013.

  1. jrossi90

    jrossi90 New Member

    I am having a problem with my SpamSnake 12.04.
    The server is running Django/Nginx/uWSGI. uWSGI keeps giving me the error mentioned in the title: "Error opening file for reading: Permission denied'

    I believe it may be related to the following bug: https://bugs.launchpad.net/ubuntu/+source/libjpeg-turbo/+bug/1031718

    I am not sure how to resolve the issue. Can anyone help?

    uWSGI Logs:

    [uWSGI] getting INI configuration from /usr/share/uwsgi/conf/default.ini
    [uWSGI] getting INI configuration from /etc/uwsgi/apps-enabled/baruwa.ini
    Wed May 22 22:04:16 2013 - option "module" found in plugin python_plugin.so
    Wed May 22 22:04:16 2013 - *** Starting uWSGI 1.0.3-debian (32bit) on [Wed May 22 22:04:16 2013] ***
    Wed May 22 22:04:16 2013 - compiled with version: 4.6.3 on 17 July 2012 02:24:04
    Wed May 22 22:04:16 2013 - current working directory: /
    Wed May 22 22:04:16 2013 - writing pidfile to /run/uwsgi/app/baruwa/pid
    Wed May 22 22:04:16 2013 - detected binary path: /usr/bin/uwsgi-core
    Wed May 22 22:04:16 2013 - setgid() to 33
    Wed May 22 22:04:16 2013 - setuid() to 33
    Wed May 22 22:04:16 2013 - your memory page size is 4096 bytes
    Wed May 22 22:04:16 2013 - uwsgi socket 0 bound to UNIX address /run/uwsgi/app/baruwa/socket fd 5
    Wed May 22 22:04:16 2013 - Python version: 2.7.3 (default, Aug 1 2012, 05:27:35) [GCC 4.6.3]
    Wed May 22 22:04:16 2013 - Python main interpreter initialized at 0x9dcccb0
    Wed May 22 22:04:16 2013 - your server socket listen backlog is limited to 100 connections
    Wed May 22 22:04:16 2013 - *** Operational MODE: preforking ***
    Wed May 22 22:04:16 2013 - WSGI application 0 (mountpoint='') ready on interpreter 0x9dcccb0 pid: 14026 (default app)
    Wed May 22 22:04:16 2013 - *** uWSGI is running in multiple interpreter mode ***
    Wed May 22 22:04:16 2013 - spawned uWSGI master process (pid: 14026)
    Wed May 22 22:04:16 2013 - spawned uWSGI worker 1 (pid: 14038, cores: 1)
    Wed May 22 22:04:16 2013 - spawned uWSGI worker 2 (pid: 14039, cores: 1)
    Error opening file for reading: Permission denied
  2. LinuxUser81

    LinuxUser81 New Member

    Same problem here

    Hi, I have the same exact problem as jrossi90.
    I wonder if a furture ubuntu patch will solve the problem ?
    Any thoughts other than a future patch to sole the issue ?

  3. jrossi90

    jrossi90 New Member

    LinuxUser81 - I solved my problem. After much testing, I realized that although those uwsgi error messages were a nuisance, they were not what were causing the timeout. It ended up being that the Celery worker was starting up before the message broker. I had to run (assuming you are wokring with a SpamSnake)
    update-rc.d -f baruwa remove
    update-rc.d baruwa defaults 91
    to fix it.
    If the uwsgi messages really bother you, Ubuntu addressed it in 12.10. Upgrading from 12.04 to 12.10 will get rid of them.


  4. LinuxUser81

    LinuxUser81 New Member


    Thanks a lot.
    This fix totally solved my issue.
    You made my day
  5. Kwambus

    Kwambus New Member

    In exactly the same situation with these timeout issues and have hit a brick wall. Everything was working perfectly until I patched 12.04 LTS at the weekend now I get the same timeouts.

    Have tried all suggestions above and no joy. No errors are reported anywhere in any logs other than the infamous 'Error opening file for reading'.

    Seems a shame to scrap everything when this is the only thing not working. I have been using Rocky's excellent guides since the early days, never had a problem before.

    Any tips or help appreciated.
  6. Kwambus

    Kwambus New Member


    Strange one this-

    OK so I could train HAM/SPAM/Release/Delete from anywhere except the message details screen which would cause a hang and timeout. Most times I would have to restart uwsgi.

    I poured over this for hours and implemented everything jrossi90 appeared to find out about this problem, I also conversed with jrossi90 yesterday but we hit a dead end. Thanks for the help by the way.

    There was little in the logs to help, but seeing the release mechanism work everywhere but this screen I knew it could not be permissions of interactions with MailScanner/SpamAssassin/Baruwa.

    As other have I saw this in the uwsgi log files:

    /usr/lib/python2.7/dist-packages/djcelery/managers.py:173: TxIsolationWarning: Polling results with transaction isolation level repeatable

    After some research I found this:


    And after inserting the following into /etc/baruwa/settings.py:

    # Recommended for MySQL. See http://code.djangoproject.com/ticket/13906

    In the section starting:

    'default': {

    I rebooted and everything is working! No idea why other than the 'not returning error code' is a possible reason as to why the session was hanging.

    I really hope this helps others, this problem was a nightmare. I have rebooted several times and thus far it appears fixed.

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