https://bugzilla.redhat.com/show_bug.cgi?id=1305562
--- Comment #1 from Jens Petersen petersen@redhat.com --- This is likely a ghc compiler bug/issue - I think there are some remaining problems still with ghc on armv7. Not sure if ghc-7.10 is any better... If you wanted to test that I could do a scratch build (copr doesn't have ARM yet). Though ghc upstream has already moved on focusing on ghc 8.0 devel.
Anyway you may perhaps have more luck discussing this with upstream ghc.