Apache WSGI woes

I'm running ubuntu 16.04 and have the roundup 1.6 demo tracker working with Python 3.5, virtualenv, apache2, shibboleth2, SSL, and postgres 11.1. Occasionally, I get an HTTP 500 error (Internal Server Error). I've tried restarting apache which doesn't help. I instrumented mod_wsgi to add more detail to the logs in 29 places where errors are detected thinking that might help isolate the problem. The log for this error is:

[Wed Nov 14 21:24:52.014080 2018] [wsgi:error] [pid 19848] [remote 10.146.122.53:52967] mod_wsgi (pid=19848): Exception occurred processing TWE1 WSGI script '/opt/roundup/trackers/demo/apache/demo_wsgi.py': mod_wsgi.c:Adapter_run: PyErr_Occurred 1.
[Wed Nov 14 21:24:52.014311 2018] [wsgi:error] [pid 19848] [remote 10.146.122.53:52967] RuntimeError: response has not been started

The part I added says the file (mod_wsgi.c) and function (Adapter_run) where the error is detected. The '1' is there because there is a similar problem in the same function. It is used to distinguish the two cases. TWE1 tells me which log message is generated. There are 2. The other 29 places call the logging function in wsgi_logger.c


The mod_wsgi module is written in C. It loads and executes Python code using the Python C API.


I can display the demo tracker's home page, create an issue and modify attributes on the issue. I can create and modify users. When I try to add a Change Note on an issue with a nosy filled in, I get the Internal Server Error. Doing an import on demo_wsgi generates no errors. The demo_wsgi.py file specifically sets sys.path to the virtualenv Python directory. It imports roundup successfully which is only installed in the virtualenv.


Having mod_wsgi generate a stack trace, and maybe even the error code would be nice, but I don't know how to do that using the Python C API.


When you encounter mod_wsgi errors like this, what do you do?


[cid:46815652-b281-4b07-a02e-f7c62f6b374e]

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