[cffi-devel] "Unhandled memory fault" on any memory allocation after fork

[agile software]

Hi all !

First, thank you for your great work on this library.

I just use it for the first time. I write the following code to test unix
fork:

===============================================
(asdf:oos 'asdf:load-op :cffi)
(defpackage :testfork
    (:use :common-lisp :cffi))
(in-package :testfork)

(defcvar "errno" :int)
(cffi:defcfun ("getpid" unix-getpid) :int)
(cffi:defcfun ("getuid" unix-getuid) :int)
(cffi:defcfun ("getgid" unix-getgid) :int)
(cffi:defcfun ("fork" unix-fork) :int)
(cffi:defcfun ("exit" unix-exit) :void (code :int))
(cffi:defcfun ("wait" unix-wait) :int (statloc :pointer))

(when (zerop (unix-fork))
(with-foreign-pointer-as-string (str 6 str-size :encoding :ascii)
          (lisp-string-to-foreign "Hello, foreign world!" str str-size))
(unix-exit 0))

(progn
  (format t "I'm parent, Pid=~A~%" (unix-getpid))
  (format t "one child claimed!~A~%" (unix-wait (cffi:null-pointer)))
)
===============================================

When I add two lines using with-foreign-pointer-as-string and
lisp-string-to-foreign, my SBCL always crashes, and tell me

" fatal error encountered in SBCL pid XXXX:
Unhandled memory fault. "

I have tried other memory allocation macros, I get the same result. But if
I remove them, the program runs and exits normally.

What's the problem about allocating memory in child process? Or I use them
in the wrong way?

My environment is : OSX 10.8.3 Processor Intel Core i7, SBCL
1.0.55.0-abb03f9, cffi_0.10.7.1 installed from quicklisp

Thank you very much!
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