OSX 64bit: ghci: loadObj internal error

When I run ghci, it crashes with the following error message:

GHCi, version 6.12.3: http://www.haskell.org/ghc/  :? for help
ghc: internal error: loadObj: failed to mmap() memory below 2Gb; asked for 724992 bytes at 0x40000000.  Try specifying an address with +RTS -xm<addr> -RTS
    (GHC version 6.12.3 for x86_64_apple_darwin)
    Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
Abort trap

System info:

$ uname -a
Darwin mbook.localhost 10.4.0 Darwin Kernel Version 10.4.0: Fri Apr 23 18:28:53 PDT 2010; root:xnu-1504.7.4~1/RELEASE_I386 i386 i386 MacBookPro3,1 Darwin
$ gcc --version
i686-apple-darwin10-gcc-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5659)

I compiled ghc-6.12.3 from sources using ghc-6.10.4 (MacPorts) for bootstrap.

Trac metadata

Trac field	Value
Version	6.12.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture