bug#24358: 25.1.50; re-search-forward errors with "Variable binding depth exceeds max-specpdl-size"

[Eli Zaretskii]

> Date: Sat, 08 Oct 2016 17:39:10 +0300
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 24358@debbugs.gnu.org, peder@klingenberg.no
> 
> > Old value = 68 'D'
> > New value = 0 '\000'
> 
> If that string is data of a Lisp string, then a call to malloc could
> relocate the data.  Code that holds C pointers into buffer or string
> text should either use SREF, or recompute the C pointer after each
> function call which could GC.

Or maybe that string was already free'd?