[gdal-dev] gdaldem hillshade returns an empty .tif (i.e. everything is 181 (?))

[Ruth Simm]

I ran this command on a completely NORMAL (but large) global .tiff with a few tiles missing - but nothing else suspicious - and after 40 minutes it returned a dud file with '181' being the only value.
Has this ever happened to anyone before?
gdaldem hillshade -of GTiff infile.tif hillshd.tif

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