This bug is weird.  I couldn't use auto-indentation in a certain file.  I tried restarting Emacs, behavior persists.  I upgraded to the latest version from Bzr, behavior persists.  I created a new account with no .emacs file and tried from there, behavior persists.  In comparison, indentation works correctly in the Emacs that in the current Debian Wheezy repository, which is 24.3.50.1.

Trying to automatically indent code inside the last function in the attached file fails.  It succeeds if I make almost any modification to code above the last function in the file -- it could be something as minor as adding a space on an empty line, but changing text in the comments seems to have no effect.  Indentation works in every function but the last one (or any one you create below it).

The point at which indentation breaks is somewhere very close to the bottom of the file, I deleted code from the bottom of the file until I found the location where it breaks.

In GNU Emacs 24.3.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.4.2)
 of 2012-12-20 on moria
Bzr revision: 111280 dmantipov@yandex.ru-20121220160905-qpa3zdo5rx335ydu
Windowing system distributor `The X.Org Foundation', version 11.0.11204000
System Description:	Debian GNU/Linux testing (wheezy)

Configured using:
 `configure '--prefix=/opt/emacs''

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: C/l

Minor modes in effect:
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  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-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  abbrev-mode: t

Load-path shadows:
None found.

Features:
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multi-tty emacs)