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

[Rob Marjot]

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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