qemu-user-static for sparc32plus : bash: fork: Invalid argument

On Debian x86-64 host system I setup a sparc chroot using:

host $ mkdir sparc 
host $ sudo debootstrap --arch=sparc --foreign wheezy sparc http://ftp.au.debian.org/debian
host $ sudo cp ~/Git/qemu/sparc32plus-linux-user/qemu-sparc32plus sparc/usr/bin/qemu-sparc32plus-static
host $ LANG=C sudo chroot sparc/ /usr/bin/qemu-sparc32plus-static /bin/bash

When I then run the second stage of debootstrap I get:

target $ /debootstrap/debootstrap --second-stage
bash: fork: Invalid argument

The above procedures works perfectly for armhf.

This is with current git HEAD (commit 93b6599734f81328ee3d608f57667742cafeea72).