[mapserver-users] cgi-bin/mapserv double free error on RHEL 8.2

[Worth Lutz]

Thanks all for your help.

We found two versions of libproj and two of GDAL. This was due to 
PostGIS pulling in newer versions.

PostGIS came from a repository and mapserver was compiled. We are 
currently trying to figure out the best way to resolve this.

One other question; Is the old php mapscript and  new swig php mapscript 
mutually exclusive?  In other words, do we build MapServer with one or 
the other?  That is my guess.

Thanks,

*Worth Lutz*


On 4/16/2021 6:37 PM, Even Rouault wrote:
>
>> Not sure.  I would also take a look inside your /cgi-bin/ dir and 
>> execute: ldd mapserv   (and look for any conflicts with libs) but 
>> that's an awful guess, not easy to see (but I've been here before 
>> with PROJ/GeoTIFF/Spatialite lib conflicts, in this case I'm not sure 
>> what lib).
>
> I strongly concur with Jeff's suggestion of using ldd mapserv. 
> Segmentation fault after the end of a plain & simple "mapserv -v" 
> really smells a binary that links to 2 versions of the same lib, and 
> clashes during deallocation of static variables (although I would 
> expect it to also crash in all situations, but behaviour might be 
> quite unprectible). And the usual suspects are indeed the ones listed 
> by Jeff.
>
>

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