Printf's in foreign code segfault on registerised amd64 ghc-6.4

[Gabriel Ebner]

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If I compile that on amd64 (gentoo, gcc-3.4.3, glibc-2.3.4,
binutils-2.15.92.0.2) using registerised ghc-6.4 and run it, it
segfaults.  According to gdb, printf's segfaulting:

#0  0x00002aaaaafcb515 in printf () from /lib/libc.so.6
#1  0x0000000000402f3c in frobnicate () at frobnicate.c:4
#2  0x0000000000402d2d in s1oH_info ()
#3  0x0000000000000000 in ?? ()
#4  0x0000000000000000 in ?? ()

If I compile it using unregisterised ghc-6.2.2 on the same box or
using ghc-6.4 in a i386 chroot, it runs fine and prints 6378137.

      Gabriel.