I would like to ask for some help for the bug #508443, if possible,
please.
The problem is that I don't have a sparc machine (I have access to the
developer accessible ones, like smetana.debian.org, but I just can't
get an imagemagick package built with the debug symbols nor there is a
imagemagick-dbg for testing/unstable).
I can reproduce the problem on sparc (it starts to request more and
more memory; strace at [1]), but I can't have more info without a
stack trace. Upstream [2] also can't help without it.
As Thiemo said [3], it seems to be somehow related with the Kernel
version (but again, I can't test as I don't have any machines where the
problem is present).
If you want to help/test, the test image can be obtained from [4].
The command that causes the failure: