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

[npostavs]

Eli Zaretskii <eliz@gnu.org> writes:
>> 
>>     Thread 1 "emacs" hit Hardware watchpoint 4: current_buffer->text->beg
>> 
>>     Old value = (unsigned char *) 0x18351b8 ""
>>     New value = (unsigned char *) 0x188a1b8 ""
>>     r_alloc_sbrk (size=290816) at ralloc.c:818
>
> r_alloc_sbrk?  What OS is this?  We only use ralloc.c on a handful of
> them, as of Emacs 25.

Uh, it's GNU/Linux (Arch), so not too obscure I would think.  Where is
the decision to use ralloc made?  Maybe something went wrong in my
configure?