[mapserver-users] Webserver Wierdness

[Daniel Morissette]

Tim,

We have experienced similar problems on one of our servers, and others
have as well, see http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=66

If you use 'top' at the Linux prompt, you might notice a number of httpd
processes at the top of the list which are using all the CPU time.  The
"document contains no data" errors that you get in your browsers are
likely coming from httpd threads that crashed (are you sure you didn't
notice any segmentation fault in your error_log?).  It seems that recent
versions of PHP MapScript get into an infinite loop or something when
PHP is used as an Apache module on RH7.x. Quite possibly a memory
corruption problem in MapScript that appears only after the same httpd
process has been used for several hits.

The only way around the problem that I know for now is to configure your
PHP as a CGI, and then a new PHP process will be started for each
request and you won't notice this problem any more.

Daniel


Tim Sutton wrote:
> 
> Hi all
> 
> I am running apache and php and am having some strange problems. The
> server runs fine most of the time, but randomly page requests return
> 'page not found' errors on $IE, 'connection to host www.wrcgis.co.uk
> broken' and under mozilla the page just locks.
> 
> I am running the site as a virtual host on a trimmed down RH7.2
> server. Ialso have bastille installed on the box using mostly default
> settings from the latter.
> 
> To see the problem (and some funky stuff I bet you never thought you
> could do under linux) visit the site at:
> 
> http://www.wrcgis.co.uk/webmap/ms_europe/
> 
> Zoom in and pan around the map a while and sooner or later the problem
> occurs. I have looked in the error logs for the site and nothing shows
> up there (I have separate error logs for each virt domain).
> 
> My config for the virt domain looks like this:
> 
> <VirtualHost *>
>    ServerAdmin sutton_t at giug.net
>    DocumentRoot /var/www/wrcgis_root
>    ServerName wrcgis.co.uk
>    ErrorLog logs/wrcgis-error_log
>    CustomLog logs/wrcgis-access_log combined
>    AccessFileName .htaccess
> </VirtualHost>
> 
> Any pearls of wisdom on how to track down and dispose of this error
> will be greatly appreciated.
> 
> Cheers
> 
> --
> -----------------------------------------------------
> Tim Sutton                          WRc plc
> Consultant, GIS Solutions Group     Frankland Road
> Direct line:  +44 (0) 1793 865056   Blagrove
> Switchboard:  +44 (0) 1793 865000   Swindon
> Fax:          +44 (0) 1793 865001   Wiltshire SN5 8YF
>                                     United Kingdom
> 
> WRc - Solutions for Water, Waste and the Environment
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