Comment 8 for bug 958305

Rebuilding unscd from source and running an unstripped binary, we see it crashing in libc's nsswitch.c:875.

#if __OPTION_EGLIBC_INET
/* Called by nscd and nscd alone. */
void
__nss_disable_nscd (void (*cb) (size_t, struct traced_file *))
{
# ifdef PTR_MANGLE
  PTR_MANGLE (cb); <---- NULL ptr deref
# endif
  nscd_init_cb = cb;
  is_nscd = true;

The 'cb' init callback function pointer is apparently optional; the definition of PTR_DEMANGLE in sysdep.h doesn't say so.