bug#5515: 23.1.92; OSX: Emacs gets stuck while wanting to display a dialog box

[Carsten Bormann]

(This bug may be related to some quirkyness around external
subprocesses, such as those started by flymake or archive-mode.  These
sometimes don't run properly, but I haven't been able to pin that one
down at all.  They do cause a dialog box, e.g., indicating that a
program is not found which is very much there.  This in turn may be
related to a bug where Emacs still thinks it has subprocesses attached
to a buffer that is to be killed.  All very confusing.  On to this bug:)

Approximately the second dialog box that Emacs displays because of the
above quirkyness gets stuck in the following way:

The dialog box is not displayed, but Emacs also no longer accepts any
input on the existing frames.  Looking at it in the debugger suggests
that there should indeed be a dialog box visible:

^C
Program received signal SIGINT, Interrupt.
0x00007fff876399ee in __semwait_signal ()
(gdb) where
#0  0x00007fff876399ee in __semwait_signal ()
#1  0x00007fff8763987d in nanosleep ()
#2  0x00007fff88a5677c in +[NSThread sleepUntilDate:] ()
#3  0x00000001001a5b87 in -[EmacsDialogPanel runDialogAt:] ()
#4  0x003a657461446c69 in ?? ()

This is as good as a crash as there is no way to supply any further
input to the running Emacs.
(Obviously, I restarted Emacs to type this bug report.)

Recent version built from git (repo.or.cz).
OSX 10.6.2, 64-bit.

In GNU Emacs 23.1.92.2 (x86_64-apple-darwin10.2.0, NS apple-appkit-1038.25)
 of 2010-01-31 on tuffi.local
Windowing system distributor `Apple', version 10.3.1038
configured using `configure  '--without-dbus' '--without-x' '--with-ns' 
'CFLAGS=-O9 -mtune=nocona -pipe -fomit-frame-pointer''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  show-paren-mode: t
  iswitchb-mode: t
  partial-completion-mode: t
  diff-auto-refine-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<menu-bar> <help-menu> <send-emacs-bug-report>

Recent messages:
Loading dired-x...done
Loading page-ext...done
Loading feedmail...done
Loading /Users/cabo/el/xmlunicode.el (source)...
Loading /Users/cabo/el/unichars.el (source)...done
Loading /Users/cabo/el/xmlunicode.el (source)...done
Loading hideshow...done
Loading comint-complete (compiled; note, source file is newer)...done
Loading gnus...done
Loading paren...done

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Features:
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