pyproj.crs.PrimeMeridian() core dumps on Ubuntu

[JackKelly]

I'm really enjoying using pyproj! Thanks loads to all the developers :)

Code Sample

import pyproj
pyproj.crs.PrimeMeridian()

python: iso19111/c_api.cpp:1115: const char* proj_as_wkt(PJ_CONTEXT*, const PJ*, PJ_WKT_TYPE, const char* const*): Assertion `obj' failed.
Aborted (core dumped)

Problem description

• Core-dumps when I try to create PrimeMeridian()

Environment Information

In [1]: import pyproj                                                                                                                                                           

In [2]: pyproj.show_versions()                                                                                                                                                  

System:
    python: 3.7.3 | packaged by conda-forge | (default, Jul  1 2019, 21:52:21)  [GCC 7.3.0]
executable: /home/jack/miniconda3/envs/test/bin/python
   machine: Linux-5.0.0-27-generic-x86_64-with-debian-buster-sid

PROJ:
      PROJ: 6.1.1
  data dir: /home/jack/miniconda3/envs/test/share/proj

Python deps:
    pyproj: 2.3.1
       pip: 19.2.3
setuptools: 41.2.0
    Cython: None

Installation method

conda create --name test pyproj && conda activate pyproj

Conda environment information (if you installed with conda):

Environment (conda list):

# packages in environment at /home/jack/miniconda3/envs/test:
#
# Name                    Version                   Build  Channel
_libgcc_mutex             0.1                        main  
bzip2                     1.0.8                h516909a_1    conda-forge
ca-certificates           2019.6.16            hecc5488_0    conda-forge
certifi                   2019.6.16                py37_1    conda-forge
libffi                    3.2.1             he1b5a44_1006    conda-forge
libgcc-ng                 9.1.0                hdf63c60_0  
libstdcxx-ng              9.1.0                hdf63c60_0  
ncurses                   6.1               hf484d3e_1002    conda-forge
openssl                   1.1.1c               h516909a_0    conda-forge
pip                       19.2.3                   py37_0    conda-forge
proj4                     6.1.1                hc80f0dc_1    conda-forge
pyproj                    2.3.1            py37h2fd02e8_0    conda-forge
python                    3.7.3                h33d41f4_1    conda-forge
readline                  8.0                  hf8c457e_0    conda-forge
setuptools                41.2.0                   py37_0    conda-forge
sqlite                    3.29.0               hcee41ef_1    conda-forge
tk                        8.6.9             hed695b0_1002    conda-forge
wheel                     0.33.6                   py37_0    conda-forge
xz                        5.2.4             h14c3975_1001    conda-forge
zlib                      1.2.11            h516909a_1006    conda-forge

Details about conda and system ( conda info ):

$ conda info
     active environment : test
    active env location : /home/jack/miniconda3/envs/test
            shell level : 1
       user config file : /home/jack/.condarc
 populated config files : /home/jack/.condarc
          conda version : 4.7.11
    conda-build version : not installed
         python version : 3.7.3.final.0
       virtual packages : 
       base environment : /home/jack/miniconda3  (writable)
           channel URLs : https://conda.anaconda.org/conda-forge/linux-64
                          https://conda.anaconda.org/conda-forge/noarch
                          https://repo.anaconda.com/pkgs/main/linux-64
                          https://repo.anaconda.com/pkgs/main/noarch
                          https://repo.anaconda.com/pkgs/r/linux-64
                          https://repo.anaconda.com/pkgs/r/noarch
          package cache : /home/jack/miniconda3/pkgs
                          /home/jack/.conda/pkgs
       envs directories : /home/jack/miniconda3/envs
                          /home/jack/.conda/envs
               platform : linux-64
             user-agent : conda/4.7.11 requests/2.22.0 CPython/3.7.3 Linux/5.0.0-27-generic ubuntu/19.04 glibc/2.29
                UID:GID : 1000:1000
             netrc file : None
           offline mode : False

[snowman2]

Thanks for the report! Definitely an unintended usage pattern. but we'll add a check for that as core dumping is never a good thing.

[JackKelly]

Thanks for the very quick reply!

I've tested a few other operations

These cause a segfault:

• pyproj.crs.CoordinateOperation()
• pyproj.crs.Datum()
• pyproj.crs.Ellipsoid()

These operations don't cause a segfault:

• pyproj.crs.Geod()
• pyproj.crs.CRS()
• pyproj.crs.is_wkt()

[snowman2]

Fix in #434

[JackKelly]

Wow, that was quick, thank you!

[snowman2]

Just happened to catch me when I was working on another PR. Probably won't happen every time :)