Hello all,
I think I've found an edge case in gdal.Dataset.BuildOverviews. I'm using GDAL
3.0.4 and have found that some of our BuildOverviews tests were crashing out
with a seg fault. On investigation, it seems to be when COMPRESS_OVERVIEW is
set to LZW, the height is greater than the width, and the overview list is long
enough that we will end up with some 1x1 overviews. Here is a code snippet that
reproduces the crash.
from osgeo import gdal
gdal.SetConfigOption('COMPRESS_OVERVIEW', 'LZW')
temp_path = '/tmp/test.tif'
drv = gdal.GetDriverByName('GTiff')
raster_ds = drv.Create(temp_path, 5, 6, 1, gdal.GDT_Int16)
del raster_ds
tif = gdal.OpenEx(temp_path, gdal.GA_ReadOnly)
tif.BuildOverviews('nearest', overviewlist=[2, 4, 8])
The data type doesn't seem to matter (I've also tried Float32), but it seems
that the raster dimensions are important. I couldn't get it to fail if the
width was equal to or greater than the height.
Thanks,
Jon
Jon Morris
Software Developer
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