glibc-2.9-2.x86_64

This crashes inside the glibc:
#include <stdlib.h>

int main (int argc, char **argv)
{
      clearenv ();
      unsetenv("FOO");
      return 0;
}

==14998== Invalid read of size 4
==14998==    at 0xB3A53F: unsetenv (setenv.c:295)
==14998==    by 0x4008326: unsetenv (mc_replace_strmem.c:760)
==14998==    by 0x8048415: main (env.c:6)
==14998==  Address 0x0 is not stack'd, malloc'd or (recently) free'd