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From Stephany Burge <steph...@ofoto.com>
Subject Re: [users@httpd] graceful restarts and child procs that never die
Date Wed, 02 Feb 2005 21:25:52 GMT
I found the corresponding bug.  It was an issue between cronolog and  
apache.

Here are the relevant reports:

http://cronolog.org/mailing-list/msg00258.html
http://www.mail-archive.com/dev%40httpd.apache.org/msg19357.html
http://issues.apache.org/bugzilla/show_bug.cgi?id=26467


-Stephany


On Jan 31, 2005, at 11:45 AM, Stephany Burge wrote:

> Hello -
>
> I am having a problem with Apache 2.0.52, graceful restarts, and  
> mod_proxy.    While serving long lasting mod_proxy requests, I do a  
> graceful restart.  Some httpd child processes will never die, nor  
> answer new incoming requests, and the # of threads will eventually  
> build up to the max and the whole thing will start hanging.  This  
> occurs on Linux Fedora Core 1 and Solaris 8.
>
> To reproduce the situation, I have set up http_load to hit the  
> webserver with numerous requests which will be handled by mod_proxy.   
> All of  the requests will eventually time out.  (ie.  the destination  
> server does not exist).   This is just a more extreme version of what  
> we see in production.
>
> Here's the process:
> 1.   Start Apache.     20 child threads.
> 2.   Begin load test.   MaxClients reached (250 httpd threads).   
> Requests begin timing out.
> 3.   Do an "apachectl graceful"  restart
> 4.   Load test finishes (ran for 2 minutes)  (250 threads when  
> concluded)
> 5.   Wait 30+ minutes.     Some threads die out, but 188 httpd threads  
> still live.
>
> I've attached the server-status ouput in html format (for  
> readability's sake).   The threads are stuck in the L state.  After  
> additional "apachectl graceful" restarts, the threads will be stuck in  
> G state, indefinitely.   I've let the server sit idle for a week and  
> not seen any more threads die.    "apachectl stop" does stop all the  
> threads.
>
> Here's the error log output:
> [Fri Jan 28 10:01:07 2005] [notice] Apache configured -- resuming  
> normal operations
> [Fri Jan 28 10:06:29 2005] [error] server reached MaxClients setting,  
> consider raising the MaxClients setting
> [Fri Jan 28 10:07:04 2005] [notice] Graceful restart requested, doing  
> restart
> [Fri Jan 28 10:07:10 2005] [notice] Apache configured -- resuming  
> normal operations
> [Fri Jan 28 10:07:10 2005] [warn] long lost child came home! (pid 1364)
>
> Here's my relevant httpd configs:
> <IfModule prefork.c>
> StartServers         50
> MinSpareServers      10
> MaxSpareServers     20
> MaxClients         250
> MaxRequestsPerChild  100
> </IfModule>
> ProxyTimeout 300
> ProxyPass /photos200 http://111.111.111.111/photos200
> #ScoreBoardFile logs/httpd.scoreboard
>
>
> Is this a known issue?   Should I submit a bug report?    Or is there  
> a configuration option I am missing?
>
>
> Thank you,
>
> Stephany Burge
> <graceful- 
> server.html>----------------------------------------------------------- 
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