Subject: bug#16350: 24.3.50; emacs_backtrace.txt

From: Eli Zaretskii <[email-masked]>
Date: Sun, 05 Jan 2014 20:00:14 +0200

> From: Juanma Barranquero <[email-masked]>
> Date: Sun, 5 Jan 2014 18:29:10 +0100
> Cc: [email-masked]
> 
> next_interval at intervals.c:720

This is here:

  if (! NULL_RIGHT_CHILD (i))
    {
      i = i->right;
      while (! NULL_LEFT_CHILD (i))  <<<<<<<<<<<<<<<<<<
	i = i->left;

Which means we enter this fragment with 'i' that is non-NULL, but an
invalid pointer.

I don't see how to catch this except on a debugger.