Concave hull crashes program

[ninafogel]

What is the bug or the crash?

When I try and run the "Concave Hull" algorithm (under Vector Geometry), it crashes QGIS.

Steps to reproduce the issue

1. Open Concave Hull algorithm (Processing toolbox > Vector geometry > Concave Hull)
2. Select point layer for input layer
3. change no other settings
4. Press run, watch program crash

Versions

3.40.1 Bratislava for Mac
3.34.13 Prizren LTR for Mac

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

No response

[agiudiceandrea]

@ninafogel, thanks for reporting. How did you install QGIS on macOS (via dmg installer, conda-forge, MacPorts, ...)? Please provide the QGIS full version info ("In the QGIS Help menu -> About, click in the table, Ctrl+A and then Ctrl+C. Finally paste here. Do not make a screenshot."). Please provide a sample layer with which the issue occurs.

[ninafogel]

Downloaded from the QGIS website:

<style type="text/css"> p, li { white-space: pre-wrap; } </style>

QGIS version	3.40.1-Bratislava
QGIS code revision	989853a
Libraries
Qt version	5.15.2
Python version	3.9.5
GDAL/OGR version	3.3.2
PROJ version	8.1.1
EPSG Registry database version	v10.028 (2021-07-07)
GEOS version	3.9.1-CAPI-1.14.2
SQLite version	3.35.2
PDAL version	2.3.0
PostgreSQL client version	unknown
SpatiaLite version	5.0.1
QWT version	6.1.6
QScintilla2 version	2.11.5
OS version	macOS 14.6
Active Python plugins
processing_r	4.1.0
BoundingBox	2.2
Submission	0.10
concavehull	2.0
processing	2.12.99
grassprovider	2.12.99
db_manager	0.1.20
MetaSearch	0.3.6

QGIS version 3.40.1-Bratislava QGIS code revision [989853a](https://github.com/qgis/QGIS/commit/989853a7a31)

Libraries
Qt version
5.15.2
Python version
3.9.5
GDAL/OGR version
3.3.2
PROJ version
8.1.1
EPSG Registry database version
v10.028 (2021-07-07)
GEOS version
3.9.1-CAPI-1.14.2
SQLite version
3.35.2
PDAL version
2.3.0
PostgreSQL client version
unknown
SpatiaLite version
5.0.1
QWT version
6.1.6
QScintilla2 version
2.11.5
OS version
macOS 14.6

Active Python plugins
processing_r
4.1.0
BoundingBox
2.2
Submission
0.10
concavehull
2.0
processing
2.12.99
grassprovider
2.12.99
db_manager
0.1.20
MetaSearch
0.3.6

[ninafogel]

gbifclean.csv
Sample layer -- a bunch of records of bumblebees from GBIF -- uploaded as deliminated text layer with WGS 84

[agiudiceandrea]

I cannot replicate the described issue using QGIS 3.34.13 on Windows 10 (OSGeo4W) with the provided layer and instructions.
I guess the issue only occurs on macOS using QGIS installed via dmg installers from qgis.org, maybe due to outdated libraries versions shipped by such installer.
Alternative installers for macOS are available e.g. via Conda-forge https://aneto.pt/posts/tutorials/2019-05-29-using-qgis-from-conda/ and MacPorts https://www.qgis.org/resources/installation-guide/#macports which ship updated versions of some libraries.

[juliepierson]

Hi, same problem here with QGIS 3.34 on Ubuntu 22.04, installed with repo https://qgis.org/ubuntu-ltr
Thanks for your help !

[agiudiceandrea]

@juliepierson, may you provide a sample layer and step-by-step instruction in order to replicate the issue and may you provide the crash report if available?

[juliepierson]

Thanks for your answer @agiudiceandrea . As far as I know, the tool crashes when using any point layer, but here is a test shapefile with a few random points : test.zip

To reproduce :

• launch QGIS
• load point layer
• execute concave hull tool with test point layer and default parameters
• QGIS crashes

I get this message when launching QGIS from terminal, don't know if it is useful :
Warning: Qt Concurrent has caught an exception thrown from a worker thread. This is not supported, exceptions thrown in worker threads must be caught before control returns to Qt Concurrent. terminate called after throwing an instance of 'QgsNotSupportedException' Abandon (core dumped)

[agiudiceandrea]

Thanks @juliepierson.
The issue doesn't occur using QGIS from OSGeo4W on Windows.
I guess the issue may be due to the the fact that QGIS installed from https://qgis.org/ubuntu-ltr on Ubuntu 22.04 uses GEOS 3.10, while QGIS on Windows from OSGeo4W uses GEOS 3.13.

You could try to install QGIS in alternative ways in order to let it use a more recent version of the GEOS library. For example, e.g.:

• by Flatpak: https://qgis.org/resources/installation-guide/#flatpak
• by Conda-forge: https://aneto.pt/posts/tutorials/2019-05-29-using-qgis-from-conda/
• using https://qgis.org/ubuntugis-ltr instead of https://qgis.org/ubuntu-ltr: https://qgis.org/resources/installation-guide/#repositories