Hi, I think you know about the problem of undefined behavior in you dcraw code [1]. This can lead to very bad things like infinite loops. Is there any progress or way to support you in fixing this? I know that there are some patches floating around like https://sources.debian.net/src/exactimage/0.9.1-2/debian/patches/gcc_48_dcraw_infinite_loop.patch/ But they seem to be against older versions of dcraw. A good way to test against such problems is to use following CFLAGS: -g3 -fsanitize=undefined -fsanitize=address -Wall and then run your testset of images against them + recording the error messages. [1] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54136#c5