Created attachment 124178 [details]
AddNoise backtrace for IMv7 Git

In order to assist with this issue, I tried upgrading to the Git Version of
Imagemagick, available on GitHub:

https://github.com/ImageMagick/ImageMagick

ImageMagick master commit 5fb7d58 still fails with LLVM revision 264388 and
Mesa commit 511ce29. (I upgrade to the latest revisions every week or two, just
in case this issue could be fixed without me noticing.)

However, the traceback is now quite different, and the image does display --
for just a moment while they do some operation subsequently which makes it
segfault. Now it's in the AddNose kernel.

Hopefully the source version will make the issue easier to reproduce/debug.