bug#27571: Crashing when printing a lisp object.

[npostavs]

Keith David Bershatsky <esq@lawlist.com> writes:

> [cl-struct-undo-tree [nil ([nil ...

Is this the struct that crashes when printing, or one that's just under
the threshold?  (I don't get any crash here)

> The persistent undo history feature uses `prin1` to create a printed
> representation of the undo-tree history, which is saved to a file and
> then restored at a later point in time with the `read` command.  Emacs
> 25.2.1 is crashing on OSX Snow Leopard and also OSX El Capitan when
> the undo tree history exceeds a count of approximately 6651.
>
>     Program received signal SIGSEGV, Segmentation fault.
>     0x0000000100141da7 in print_object (obj=4790542093, printcharfun=0, 
>         escapeflag=true) at print.c:1350
>     1350      {

Line 1350 is just at the beginning of print_object, right?  I'm guessing
you're just overflowing the stack.  Can you increase it with ulimit or
something?