The program built with ghc 6.4.2 -prof hangs, without -prof works

To reproduce the problem, download the attachment and do the following, assuming 6.4.2 is the version of the ghc executable in path:

tar xzf static.tar.gz
cd static
make
./gens 4                    # works
./gens - <tests             # works
./gens-prof 4               # hangs

Several points:

• ghc 6.4.1 works properly. That's what I'm using for profiling now.

• At first I thought the problem was with Edison libraries, but an

  older version of the project, without Edison, behaves the same.

• Removing -auto-all and add -fasm made no difference. I guess that means GCC is not at fault.

By the way, I'm running Gentoo Linux with an Athlon CPU. Let me know if you have trouble reproducing the problem.