[mapserver-users] PHP MapScript request handling gives seg fault error in libgdal

[Rob Marjot]

Hi Jeff, all,

Thank you for your thoughts on this. Can you elaborate on the PROJ<6
remark; serious performance hits?

Indeed, I am on the NG (SWIG) MapScript. Trying with shp2img and mapserv
-nh will require to have the equivalent .map file on disk; I will work on
that soon.

Taking a complete different approach, I have been able to reproduce the
same problem by:
1. Installing *binaries* for MapServer 7.6.1, GDAL 3.1.3 and PROJ 7.1.1
from UbuntuGIS Unstable
2. Add ECW support through compiling the simple GDAL-plugin (tested:
gdal_translate from ECW to GTiff works brilliantly)
3. Configured this to run in the context of 7.4 PHP-FPM

Again the seg fault. Connecting to PHP-FPM from either Apache or NGINX does
not make a difference, but that's no surprise.

Rob

Op ma 12 okt. 2020 om 15:38 schreef Jeff McKenna <
jmckenna at gatewaygeomatics.com>:

> Hi Rob,
>
> I'm not sure what is happening in your case, but make sure that you are
> using the recommended PHP SWIG MapScript in your build (-DWITH_PHPNG=1),
> as the old PHP MapScript is unmaintained.
>
> Some other thoughts:
>
> - can you trigger this with shp2img at the commandline? (this will
> remove MapScript/Apache/WMS from the equation)
> https://mapserver.org/utilities/shp2img.html
>
> - also, try your GetMap request at the commandline with:
>
>      mapserv -nh
> "QUERY_STRING=map=/ms4w/apps/local-demo/local-demo.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&..."
>
>  > ttt.png
>
> But if I can speak openly here, I believe most production instances are
> still running PROJ<6, so everyone is beginning to experiment with
> settings of FCGI/PHP-FPM for GDAL3+PROJ7 (as there is a noticeable
> performance hit with the new PROJ).
>
> In other words, keep us posted here on your testing and configuration;
> also, do consider documenting your configuration and workaround on the
> MapServer wiki, so others can follow:
> https://github.com/MapServer/MapServer/wiki
>
> Thanks Rob!
>
> -jeff
>
>
>
> --
> Jeff McKenna
> MapServer Consulting and Training Services
> co-founder of FOSS4G
> http://gatewaygeo.com/
>
>
>
> On 2020-10-09 9:44 p.m., Rob Marjot wrote:
> > Hi All,
> >
> > I am running latest MapServer 7.6.1 compiled from source on Ubuntu 20.04
> > with (also from source):
> > - proj-7.1.0
> > - gdal-3.1.2
> >
> > Using the ppa:ondrej/php repo, I installed the following PHP packages:
> > php7.4 php7.4-fpm php7.4-dev
> > Apache/2.4.41 proxies into the FPM over unix socket
> >
> > Compiling MapServer went smoothly and through the configuration of the
> > extension in PHP, MapScript is available. When I call (HTTP GET) my PHP
> > script to handle a WMS-formatted request [ OWSDispatch() ], the first 2
> > requests are handled fine (returns a rendered map image), but the next
> > two make the PHP-FPM crash:
> > /var/log/syslog:
> > Oct 10 01:59:25 as02 kernel: [3663532.034251] php-fpm7.4[1260175]:
> > segfault at 28 ip 00007fbce21fb3eb sp 00007ffe87f600e0 error 6 in
> > libgdal.so.27.0.2[7fbce152e000+d50000]
> > Oct 10 01:59:25 as02 kernel: [3663532.034262] Code: 8b 15 81 de 56 00 e9
> > 24 2d 38 ff 0f 1f 40 00 f3 0f 1e fa 41 54 49 89 f4 55 48 89 d5 53 89 fb
> > 48 89 cf e8 e8 f0 ff ff 48 63 fb <4c> 89 24 f8 48 89 ac f8 00 01 00 00
> > 5b 5d 41 5c c3 0f 1f 40 00 f3
> >
> > What could be the problem? Any help is much appreciated.
> >
> > Best,
> > Rob Marjot
> >
> >
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