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bug#27571: Crashing when printing a lisp object.

From: npostavs
Subject: bug#27571: Crashing when printing a lisp object.
Date: Mon, 03 Jul 2017 22:05:12 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.2.50 (gnu/linux)

Keith David Bershatsky <address@hidden> 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

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