QGIS crashed during qix file creation

[D-MM-62]

What is the bug or the crash?

QGIS crashes when saving a shapefile layer or explicitly creating the spatial index.

Background:
We store our Shape-Files on a network drive, which is very slow.
Log-Files are more or less empty - no indication of the crash to be found

Question:
If this error only occurs in our slow environment, it is possible to make the creation of a qix file optional when saving? Then of course this ticket is a feature request and not a bug.

Steps to reproduce the issue

Scenario A

1. Load Shape-File as layer
2. ... from a very slow (network) drive
3. ... with a few points
4. Change something, add or remove a point
5. Click on "Save"

Scenario B

1. Load Shape-File as layer
2. ... from a very slow (network) drive
3. ... with a few points
4. ... without an qix file
5. Clck on "Create spatial index"

Outcome
-> old qix file is removed
-> new qix file is created - but keeps empty - zero kb
-> QGIS stops responding
-> After a few minutes QGIS crashes/disappears
-> new qix file is filled with content - 300+ kb

Versions

QGIS-Version 3.34.10-Prizren
QGIS-Codeversion 113de9e
Qt-Version 5.15.13
Python-Version 3.12.5
GDAL-Version 3.9.2
PROJ-Version 9.4.0
EPSG-Registraturdatenbankversion v11.004 (2024-02-24)
GEOS-Version 3.12.2-CAPI-1.18.2
SQLite-Version 3.45.1
PDAL-Version 2.6.3
PostgreSQL-Client-Version 16.2
SpatiaLite-Version 5.1.0
QWT-Version 6.2.0
QScintilla2-Version 2.14.1
BS-Version Windows 10 Version 2009

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