Can you set LogLevel to debug and also add:

    WSGIVerboseDebugging On

Capture log output from before request, until after failed request.

Graham

> On 14 Aug 2018, at 10:42 pm, Hemant Chaudhary 
> <[email protected]> wrote:
> 
> Hi,
> By mistake I pasted the old logs. New error log is like this :
> [Tue Aug 14 12:30:06.016383 2018] [wsgi:info] [pid 654311463:tid 
> 577193508084252676] mod_wsgi (pid=654311463): Create interpreter 
> 'www.example.com:8079|/wsgi/first.py'.
> [Tue Aug 14 12:30:06.024527 2018] [wsgi:info] [pid 654311463:tid 
> 577193508084252676] [remote 15.213.82.149:61543 
> <http://15.213.82.149:61543/>] mod_wsgi (pid=654311463, process='example.com 
> <http://example.com/>', application='www.example.com:8079|/wsgi/first.py'): 
> Loading WSGI script 
> '/home/hemant_super/practi/web4/apache-2.4.29/wsgi/first.py'.
> [Tue Aug 14 12:30:16.471707 2018] [wsgi:error] [pid 1325400115:tid 
> 577187392050757636] (4022)Invalid function argument: [client 
> 15.213.82.149:61550 <http://15.213.82.149:61550/>] mod_wsgi (pid=1325400115): 
> Unable to send request details to WSGI daemon process 'example.com 
> <http://example.com/>' on '/tmp/wsgi.1879048236.0.1.sock'.
> 
> This is an NonStop HPE Operating System and PID for processes are like this 
> only. So no issues with PID.
> 
> One more interesting outcome is that, now when I am browsing first.py for the 
> first time then able to get the page. But after that it is giving the error 
> invalid function.
> Please share your though.
> Hemant 
> 
> 
> 
> On Tue, Aug 14, 2018 at 4:54 PM, Graham Dumpleton <[email protected] 
> <mailto:[email protected]>> wrote:
> Still more inclined to think is just where socket is, being on NFS server. 
> The process ID size I can't see that would cause an issue when looking at 
> code. UNIX sockets though, don't sometimes work in NFS mounted file systems 
> from memory.
> 
> 
>> On 14 Aug 2018, at 9:12 pm, Graham Dumpleton <[email protected] 
>> <mailto:[email protected]>> wrote:
>> 
>> I would say the issue may be related to the size of the pids.
>> 
>> A process ID would normally be less than 2^22. Your system has larger values 
>> for some reason. The value 1912602637 is greater than 2^31 and so would be 
>> regarded as negative value in 32 bit integer. This may screw up some stuff.
>> 
>> So definitely want to know why you have such large process IDs.
>> 
>> Graham
>> 
>>> On 14 Aug 2018, at 9:03 pm, Graham Dumpleton <[email protected] 
>>> <mailto:[email protected]>> wrote:
>>> 
>>> BTW, what operating system is this?
>>> 
>>> It is very strange to see such large process ID numbers such as 1325400071 
>>> and 1912602637.
>>> 
>>> From:
>>> 
>>> * 
>>> https://unix.stackexchange.com/questions/16883/what-is-the-maximum-value-of-the-process-id
>>>  
>>> <https://unix.stackexchange.com/questions/16883/what-is-the-maximum-value-of-the-process-id>
>>> 
>>> /proc/sys/kernel/pid_max  
>>>   This file (new in Linux 2.5) specifies the value at which PIDs wrap around
>>>   (i.e., the value in this file is one greater than the maximum PID). The
>>>   default value for this file, 32768, results in the same range of PIDs as
>>>   on earlier kernels. On 32-bit platfroms, 32768 is the maximum value for
>>>   pid_max. On 64-bit systems, pid_max can be set to any value up to 2^22
>>>   (PID_MAX_LIMIT, approximately 4 million).
>>> 
>>> Those process IDs are way above 4 million value even of a 64 bit system.
>>> 
>>> Graham
>>> 
>>>> On 14 Aug 2018, at 8:52 pm, Graham Dumpleton <[email protected] 
>>>> <mailto:[email protected]>> wrote:
>>>> 
>>>> If you have set WSGISocketPrefix and properly re-started Apache, it should 
>>>> not be showing the path:
>>>> 
>>>>     
>>>> /home/hemant_super/practi/web4/apache-2.4.29/logs/wsgi.2030043146.0.1.sock
>>>> 
>>>> but should be showing:
>>>> 
>>>>     /tmp/wsgi.2030043146.0.1.sock
>>>> 
>>>> Ensure you have stopped and started Apache after making the change.
>>>> 
>>>> Graham
>>>> 
>>>>> On 14 Aug 2018, at 8:50 pm, Hemant Chaudhary 
>>>>> <[email protected] <mailto:[email protected]>> 
>>>>> wrote:
>>>>> 
>>>>> No Still no working :
>>>>> Error_log :
>>>>> [Tue Aug 14 09:21:13.966947 2018] [wsgi:info] [pid 1325400071:tid 
>>>>> 577203541127856132] [remote 15.213.82.149:58102 
>>>>> <http://15.213.82.149:58102/>] mod_wsgi (pid=1325400071, 
>>>>> process='example.com <http://example.com/>', 
>>>>> application='www.example.com:8079 
>>>>> <http://www.example.com:8079/>|/wsgi/first.py'): Loading WSGI script 
>>>>> '/home/hemant_super/practi/web4/apache-2.4.29/wsgi/first.py'.
>>>>> [Tue Aug 14 09:23:06.846906 2018] [wsgi:error] [pid 1912602637:tid 
>>>>> 577197012777500676] (4022)Invalid function argument: [client 
>>>>> 15.213.82.149:58117 <http://15.213.82.149:58117/>] mod_wsgi 
>>>>> (pid=1912602637): Unable to send request details to WSGI daemon process 
>>>>> 'example.com <http://example.com/>' on 
>>>>> '/home/hemant_super/practi/web4/apache-2.4.29/logs/wsgi.2030043146.0.1.sock'.
>>>>> 
>>>>> This is my configuration :
>>>>> LoadModule wsgi_module modules/mod_wsgi.so
>>>>> Listen 8079
>>>>> WSGISocketPrefix /tmp/wsgi
>>>>> <VirtualHost 15.213.91.33:8079 <http://15.213.91.33:8079/>>
>>>>> 
>>>>>     ServerName www.example.com <http://www.example.com/>
>>>>>     ServerAlias example.com <http://example.com/>
>>>>>     ServerAdmin [email protected] <mailto:[email protected]>
>>>>>     LogLevel info
>>>>>     ErrorLog "logs/error_wsgi_log"
>>>>>     LogFormat "%P %p %h %l %u %t \"%r\" %>s %b" common
>>>>>     CustomLog "logs/access_wsgi_log" common
>>>>>     
>>>>>     WSGIScriptAlias /wsgi 
>>>>> "/home/hemant_super/practi/web4/apache-2.4.29/wsgi/"
>>>>> 
>>>>>    # WSGISocketPrefix /tmp/wsgi
>>>>>     WSGIDaemonProcess example.com <http://example.com/> processes=1 
>>>>> threads=15 display-name="wsgi_hem"
>>>>>     WSGIProcessGroup example.com <http://example.com/>
>>>>> 
>>>>>     
>>>>> <Directory '/home/hemant_super/practi/web4/apache-2.4.29/wsgi/'>
>>>>> AddHandler wsgi-script .wsgi .py .pl
>>>>>     AllowOverride All
>>>>>     Options +Indexes +FollowSymLinks +ExecCGI
>>>>>    Require all granted
>>>>>   </Directory>
>>>>> 
>>>>> </VirtualHost>
>>>>> 
>>>>> Do I need to change anything in conf. But the same script and conf works 
>>>>> fine with embeded wsgi in apache.
>>>>> 
>>>>> Thanks
>>>>> Hemant
>>>>> 
>>>>> On Tue, Aug 14, 2018 at 3:25 PM, Graham Dumpleton 
>>>>> <[email protected] <mailto:[email protected]>> wrote:
>>>>> Try setting:
>>>>> 
>>>>>     WSGISocketPrefix /tmp/wsgi
>>>>> 
>>>>> as a test to see if moving the socket out of the NFS partition helps.
>>>>> 
>>>>> Graham
>>>>> 
>>>>> 
>>>>>> On 14 Aug 2018, at 7:53 pm, Hemant Chaudhary 
>>>>>> <[email protected] <mailto:[email protected]>> 
>>>>>> wrote:
>>>>>> 
>>>>>> Yes it is on NFS server
>>>>>> 
>>>>>> On Aug 14, 2018 3:11 PM, "Graham Dumpleton" <[email protected] 
>>>>>> <mailto:[email protected]>> wrote:
>>>>>> Quick question. Is your home directory on an NFS server?
>>>>>> 
>>>>>> Will respond properly later with things to try.
>>>>>> 
>>>>>> Graham
>>>>>> 
>>>>>>> On 14 Aug 2018, at 7:30 pm, Hemant Chaudhary 
>>>>>>> <[email protected] 
>>>>>>> <mailto:[email protected]>> wrote:
>>>>>>> 
>>>>>>> Hi,
>>>>>>> 
>>>>>>> I have setup where embeded wsgi is working while daemon is not working 
>>>>>>> and giving the following error 
>>>>>>> "
>>>>>>> [Tue Aug 14 09:20:55.990713 2018] [wsgi:info] [pid 1325400071:tid 
>>>>>>> 7857357344764657668] mod_wsgi (pid=1325400071): Attach interpreter ''.
>>>>>>> [Tue Aug 14 09:21:13.956064 2018] [wsgi:info] [pid 1325400071:tid 
>>>>>>> 577203541127856132] mod_wsgi (pid=1325400071): Create interpreter 
>>>>>>> 'www.example.com:8079 <http://www.example.com:8079/>|/wsgi/first.py'.
>>>>>>> [Tue Aug 14 09:21:13.966947 2018] [wsgi:info] [pid 1325400071:tid 
>>>>>>> 577203541127856132] [remote 15.213.82.149:58102 
>>>>>>> <http://15.213.82.149:58102/>] mod_wsgi (pid=1325400071, 
>>>>>>> process='example.com <http://example.com/>', 
>>>>>>> application='www.example.com:8079 
>>>>>>> <http://www.example.com:8079/>|/wsgi/first.py'): Loading WSGI script 
>>>>>>> '/home/hemant_super/practi/web4/apache-2.4.29/wsgi/first.py'.
>>>>>>> [Tue Aug 14 09:23:06.846906 2018] [wsgi:error] [pid 1912602637:tid 
>>>>>>> 577197012777500676] (4022)Invalid function argument: [client 
>>>>>>> 15.213.82.149:58117 <http://15.213.82.149:58117/>] mod_wsgi 
>>>>>>> (pid=1912602637): Unable to send request details to WSGI daemon process 
>>>>>>> 'example.com <http://example.com/>' on 
>>>>>>> '/home/hemant_super/practi/web4/apache-2.4.29/logs/wsgi.2030043146.0.1.sock'."
>>>>>>> 
>>>>>>> "
>>>>>>> For daemon I have added following lines in configuration :
>>>>>>>  WSGIDaemonProcess example.com <http://example.com/> processes=1 
>>>>>>> threads=15 display-name="wsgi_hem"
>>>>>>>  WSGIProcessGroup example.com <http://example.com/>
>>>>>>> 
>>>>>>> Log for working embeded wsgi is :
>>>>>>> " [Tue Aug 14 06:18:52.707764 2018] [wsgi:info] [pid 503316532:tid 
>>>>>>> 577196600460640260] [client 15.213.82.149:57719 
>>>>>>> <http://15.213.82.149:57719/>] mod_wsgi (pid=503316532, process='', 
>>>>>>> application='www.example.com:8079 
>>>>>>> <http://www.example.com:8079/>|/wsgi/first.py'): Loading WSGI script 
>>>>>>> '/home/hemant_super/practi/web4/apache-2.4.29/wsgi/first.py'. "
>>>>>>> 
>>>>>>> Please help to know where am I going wrong ?
>>>>>>> 
>>>>>>> Thanks
>>>>>>> Hemant
>>>>>>> 
>>>>>>> 
>>>>>>> 
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>>>> 
>>> 
>> 
> 
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