nginx does not close the connection to backend pop3 server

[Joe Wong]

Hi Igor,

The patch works for me. :-)

- Joe

Igor Sysoev wrote:
> On Tue, Jul 24, 2007 at 02:33:23PM +0800, Joe Wong wrote:
>
>   
>> Ok, the log has been sent to you directly in another mail.
>>     
>
> Try the attached patch.
>
>   
>> - Joe
>>
>> Igor Sysoev wrote:
>>     
>>> On Tue, Jul 24, 2007 at 10:16:03AM +0800, Joe Wong wrote:
>>>
>>>  
>>>       
>>>> I am evaluating nginx pop3 proxy function and encounter 1 problem. Here 
>>>> is my setup:
>>>>
>>>> OS: RedHat FC7 2.6.21-1.3194.fc7 #1 SMP Wed May 23 22:35:01 EDT 2007 
>>>> i686 i686 i386 GNU/Linux
>>>> GCC: gcc version 4.1.2 20070502 (Red Hat 4.1.2-12)
>>>> Nginx version: 0.5.26
>>>> Config option: --with-debug --with-mail --with-select_module
>>>>
>>>> Nginx config:
>>>> daemon on;
>>>> user root;
>>>> worker_processes 10;
>>>>
>>>> error_log logs/error.log debug;
>>>> pid       logs/nginx.pid;
>>>>
>>>> #maximum total connections of each worker
>>>> events {
>>>>   worker_connections 100;
>>>> #    use select;
>>>>   debug_connection 127.0.0.1;
>>>> }
>>>>
>>>> mail {
>>>>   auth_http   localhost:8088/auth.php;
>>>>
>>>>   pop3_capabilities  "TOP"  "USER";
>>>>   pop3_auth          plain;
>>>>   imap_capabilities  "IMAP4rev1"  "UIDPLUS";
>>>>
>>>>   #pop3 configuration
>>>>   server {
>>>>       listen     110;
>>>>       protocol   pop3;
>>>>       proxy      on;
>>>>   }
>>>> }
>>>>
>>>>
>>>> Test case:
>>>> - A mailbox with message around 10M large
>>>> - Use telnet to port 110, issue the USER/PASS command to login
>>>> - Issue RETR 1 to download the 10M message
>>>> - Close the connection by pressing Ctrl-] then 'q' right after RETR 
>>>> command is issued
>>>>
>>>> At this time,  Netstat shows that the connection from nginx to the 
>>>> backend POP3 server remains connected.
>>>>
>>>> Now, I repeat the above test case with "use select" turns on in 
>>>> nginx.conf.  This time, I don't see the connection to backend pop3 
>>>> remains after my client connection to nginx is terminated in the middle. 
>>>> I suspect this is something to do with epoll call?
>>>>
>>>> I only did the test on POP3 proxy, not sure if it has the same behaviour 
>>>> on HTTP.
>>>>
>>>> Please let me know if you need more information.
>>>>    
>>>>         
>>> Could you create debug logs for epoll and select cases, and send them to 
>>> me ?
>>>
>>>
>>>  
>>>       
>
>   

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