[Bug libc/12847] dprintf/vdprintf can cause fork to fail (child process crash)

["freker at zes dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12847

Frank Reker <freker at zes dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
                 CC|                            |freker at zes dot com
         Resolution|FIXED                       |---

--- Comment #3 from Frank Reker <freker at zes dot com> ---
Sorry,
maybe I'm blind, but where is the patch?
I still do encounter the problem in version 2.17 from 25th dec. 2012.
The fresetlockfile function (nptl/sysdeps/unix/sysv/linux/fork.c) that fails:
----snip-------
static void
fresetlockfiles (void)
{
  _IO_ITER i;

  for (i = _IO_iter_begin(); i != _IO_iter_end(); i = _IO_iter_next(i))
    _IO_lock_init (*((_IO_lock_t *) _IO_iter_file(i)->_lock));
}
----snap------

and the code in
_IO_vdprintf
----snip-----
  struct _IO_FILE_plus tmpfil;
  struct _IO_wide_data wd;
  int done;

#ifdef _IO_MTSAFE_IO
  tmpfil.file._lock = NULL;
#endif
  _IO_no_init (&tmpfil.file, _IO_USER_LOCK, 0, &wd, &_IO_wfile_jumps);
  _IO_JUMPS (&tmpfil) = &_IO_file_jumps;
  _IO_file_init (&tmpfil);
----snap-----

The _lock here is explicitely set to NULL and _IO_file_init
links the struct to the chain: _IO_list_all

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