From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux alpha; en-US; rv:0.9.8) Gecko/20020205
Description of problem:
Scaling down the height of an image creates an image that is solid black. this
only seems to happen on alpha. scaling only the width does not exhibit this
problem, and increasing the height also works.
Version-Release number of selected component (if applicable):
gimp-1.2.1-5 and gimp-1.2.1-7 (rawhide)
works ok with gimp-1.2.1-7 on Athlon, RH7.2
Steps to Reproduce:
1. open an image
3. pick a height less than the current one
Actual Results: solid black image
Expected Results: scaled image
yes, I saw this behavior as well. We won't be fixing it on alpha unfortunately.
That product is end of life.
FWIW, this is a problem with gcc optimization: