Thank you very much for a quick reply:
I cannot copy the logs/configs from my firm but I will try my best to
re-create(manual copy paste) it here
*Apache Configuration*:
LoadModule log_config_module <...../mod_log_config.so>
LoadModule wsgi_module <...../mod_wsgi.so>
LoadModule authz_host_module <..../mod_authz_host.so>
Listen 8080
PidFile <...path to pid file>
LogLevel Info
ErroLog /local/scratch/apache.err
TransferLog /local/scratch/apache.out
WSGIApplicationGroup %{GLOBAL}
WSGIRestrictEmbedded On
WSGISocketPrefix /local/scratch/run/wsgi
<VirtualHost *:8080>
ServerName xyz.com
WSGIDaemonProcess myapp processes=5 threads=5 display-name=%{GROUP}
deadlock-timeout=60
WSGIApplicationGroup %{GLOBAL}
WSGIProcessGroup myapp
WSGIScriptAlias / /local/scratch/....../bin/webapp-1.0.wsgi
<Directory /local/scratch/....../bin>
Order allow, deny
Allow from all
</Directory>
</VirtualHost>
*Logs:*
[info] mod_wsgi (pid=5038): Starting process 'myapp' with threads=5
[info] mod_wsgi (pid=5038): Initializing Python.
[notice] Apache/2.2.24 (Unix) mod_wsgi/4.3.2 Python/2.7.1 configured --
resuming normal operations
[info] Server built: Aug 2 2013 13.51.41
[info] mod_wsgi (pid=5040): Starting process 'myapp' with threads=5
[info] mod_wsgi (pid=5041): Starting process 'myapp' with threads=5
[info] mod_wsgi (pid=5040): Initializing Python.
[info] mod_wsgi (pid=5039): Starting process 'myapp' with threads=5
[info] mod_wsgi (pid=5039): Initializing Python.
[info] mod_wsgi (pid=5042): Starting process 'myapp' with threads=5
[info] mod_wsgi (pid=5041): Initializing Python.
[info] mod_wsgi (pid=5042): Initializing Python.
[info] mod_wsgi (pid=5038): Attaching interpreter ''.
[info] mod_wsgi (pid=5042): Attaching interpreter ''.
[info] mod_wsgi (pid=5041): Attaching interpreter ''.
[info] mod_wsgi (pid=5040): Attaching interpreter ''.
[info] mod_wsgi (pid=5039): Attaching interpreter ''.
[info] [client 10.79.29.2] mod_wsgi (pid=5038, process='myapp',
application=''): Loading WSGI script
'/local/scratch/....../bin/webapp-1.0.wsgi'
[info] [client 10.79.29.2] mod_wsgi (pid=5042, process='myapp',
application=''): Loading WSGI script
'/local/scratch/....../bin/webapp-1.0.wsgi'
[info] [client 10.79.29.2] mod_wsgi (pid=5040, process='myapp',
application=''): Loading WSGI script
'/local/scratch/....../bin/webapp-1.0.wsgi'
[info] [client 10.79.29.2] mod_wsgi (pid=5039, process='myapp',
application=''): Loading WSGI script
'/local/scratch/....../bin/webapp-1.0.wsgi'
[info] [client 10.79.29.2] mod_wsgi (pid=5041, process='myapp',
application=''): Loading WSGI script
'/local/scratch/....../bin/webapp-1.0.wsgi'
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] server seems busy, (you many need to increase StartServers, or
Min/MaxSpareServers), spawning 8 children, there are 0 idle, and 12 total
children
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] server seems busy, (you many need to increase StartServers, or
Min/MaxSpareServers), spawning 16 children, there are 0 idle, and 20 total
children
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] server seems busy, (you many need to increase StartServers, or
Min/MaxSpareServers), spawning 32 children, there are 0 idle, and 36 total
children
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] server seems busy, (you many need to increase StartServers, or
Min/MaxSpareServers), spawning 32 children, there are 0 idle, and 68 total
children
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] mod_wsgi (pid=5038): Daemon process deadlock timer expired, stopping
process 'myapp'
[info] mod_wsgi (pid=5038): Shutdown requested 'myapp'
[info] mod_wsgi (pid=5041): Daemon process deadlock timer expired, stopping
process 'myapp'
[info] mod_wsgi (pid=5041): Shutdown requested 'myapp'
[info] mod_wsgi (pid=5042): Daemon process deadlock timer expired, stopping
process 'myapp'
[info] mod_wsgi (pid=5042): Shutdown requested 'myapp'
[info] mod_wsgi (pid=5038): Aborting process 'myapp'
[info] mod_wsgi (pid=5038): Exiting process 'myapp'
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] mod_wsgi (pid=5038): Process 'myapp' had died, deregister and
restart it
[info] mod_wsgi (pid=5038): Process 'myapp' has been deregistered and will
no longer be monitored
[info] mod_wsgi (pid=5405): Starting process 'myapp' with threads=5
[info] mod_wsgi (pid=5405): Initializing Python.
[info] mod_wsgi (pid=5405): Attaching interpreter ''.
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] mod_wsgi (pid=5041): Aborting process 'myapp'
[info] mod_wsgi (pid=5041): Exiting process 'myapp'
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] [client 10.79.29.2] mod_wsgi (pid=5405, process='myapp',
application=''): Loading WSGI script
'/local/scratch/....../bin/webapp-1.0.wsgi'
[info] mod_wsgi (pid=5042): Aborting process 'myapp'
[info] mod_wsgi (pid=5042): Exiting process 'myapp'
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
[error] [client 10.79.29.2] Truncated or oversized response headers
received from daemon process 'myapp':
/local/scratch/....../bin/webapp-1.0.wsgi
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
[info] mod_wsgi (pid=5041): Process 'myapp' had died, deregister and
restart it
[info] mod_wsgi (pid=5041): Process 'myapp' has been deregistered and will
no longer be monitored
[info] mod_wsgi (pid=5042): Process 'myapp' had died, deregister and
restart it
[info] mod_wsgi (pid=5042): Process 'myapp' has been deregistered and will
no longer be monitored
................
................
[error] <All the print statements from python app is getting logged here as
an error>
................
................
*Please let me know if there is any more info required*
On Tuesday, January 22, 2019 at 8:11:18 PM UTC+5:30, Graham Dumpleton wrote:
>
> Can you show the actual parts of the Apache configuration for mod_wsgi and
> your WSGI application. The clues you have given aren't really enough. Need
> to see the actual config to know if you have it correct. The actual log
> messages also are important as they confirm in what context the WSGI
> application runs. Ensure though you have LogLevel set to info to get most
> useful information.
>
> On 22 Jan 2019, at 5:39 pm, Shakim Mohammed <[email protected]
> <javascript:>> wrote:
>
> Hello,
>
> I have a Flask + Sqlalchemy application(connecting to a Sybase database)
> that I am trying to run in Apache + mod_wsgi setup
>
> Few pointers on my wsgi setup:
>
> - Using WSGIDaemonProcess <nameOfApp> processes=x threads=y
> - Using WSGIApplicationGroup %{GLOBAL}
>
> No matter what combination of values of *x* and *y* I use, after
> processing some request, my apache/mod_wsgi hangs up for sometime showing
> logs like :
>
> - Daemon process deadlock timer expired, stopping process <>
> - Shutdown process <nameOfApp>
> - Aborting process <nameOfApp>
> - Exiting process <nameOfApp>
>
> I believe it hangs for 300 seconds(which is default deadlock-timeout)
> If I set deadlock-timeout = 60, apache/mod_wsgi recovers in 60sec
>
> Few other logs that I see are :
>
> - Truncated or oversized response headers received from daemon process
> <nameOfApp>
> - server seems busy, (you may need to increase StartServers, or
> Min/MaxServers, spawning 16 children, there are three idle
>
> What could be the reason of this deadlock and other logs shown above?
>
> Could this be because of a rogue C extension as pointed out by Graham at
> various places?
>
> There are bunch of third party modules that I am using which has C
> extension like -> http://python-sybase.sourceforge.net/download.html
>
> Is there anyway to fix this or make it more stable(not going into deadlock
> too frequently and giving 500 to clients)?
>
> FYI, I am using prefork instead of worker at this moment. I am not loading
> unnecessary modules like mod_php.
> The only modules that I am loading in my apache conf are
> "mod_authz_host.so", "mod_log_config.so" and "mod_wsgi.so"
> I believe the issue I am trying to highlight is totally independent of
> whether it is a prefork or worker setup
>
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>
>
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