From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eric Abrahamsen <eric@ericabrahamsen.net>
Subject: Re: bug#19606: 24.4; Emacs hangs when editing a 5-line Org file
Date: Fri, 16 Jan 2015 19:30:20 +0800
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Fabrice Niessen <fni-news@pirilampo.org>
writes:

> Eli Zaretskii wrote:
>>> From: Glenn Morris <rgm@gnu.org>
>>> Cc: Fabrice Niessen <fni-news@pirilampo.org>,  19606-ubl+/3LiMTaZdePnXv/OxA@public.gmane.org
>>> Date: Thu, 15 Jan 2015 16:37:36 -0500
>>> 
>>> 
>>> I just want to note that there seems to be a tendency to try and use
>>> gdb to debug Org problems, when debug-on-quit and ctrl-g might work.
>>
>> Very true.
>
> As it doesn't seem obvious, let me state explicitly that C-g does
> nothing; Emacs is hung and does not answer anymore to anything...
>
> Is there an alternative to GDB in such cases?
>
> Best regards,
> Fabrice

I've had this problem before, also un-quittable, and have gotten a
backtrace and regained control by sending SIGUSR2 to the emacs process.
The backtrace indicates some conflict with flyspell-mode, same as
you.