GNU bug report logs - #31362
stack overflow in GC when creating large nested object

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Package: emacs; Severity: wishlist; Reported by: Tino Calancha <tino.calancha@HIDDEN>; Keywords: confirmed; merged with #2099; dated Fri, 4 May 2018 07:53:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Changed bug title to 'stack overflow in GC when creating large nested object' from '24.5; Crash after eval a form' Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Forcibly Merged 2099 31362. Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Noam Postavsky <npostavs@HIDDEN>
To: Andreas Schwab <schwab@HIDDEN>
Subject: Re: bug#31362: 24.5; Crash after eval a form
References: <87h8nnhn8j.fsf@HIDDEN> <871serokak.fsf@HIDDEN>
Date: Fri, 04 May 2018 05:51:56 -0400
In-Reply-To: <871serokak.fsf@HIDDEN> (Andreas Schwab's message of
 "Fri, 04 May 2018 11:13:39 +0200")
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forcemerge 2099 31362
retitle 2099 stack overflow in GC when creating large nested object
quit

Andreas Schwab <schwab@HIDDEN> writes:

> On Mai 04 2018, Tino Calancha <tino.calancha@HIDDEN> wrote:
>
>> ;; Emacs crash after evaluate the following form:
>> (let* ((lst (list 'x))
>>        (form (cons 'die
>>                    (list 'w '(pop lst)))))
>>   (while lst
>>     (setq form
>>           (cons 'die
>>                 (cons form
>>                       (list '(pop lst))))))
>>   form)
>
> This creates a degenerate list, causing stack overflow during GC.

Right, this is just a more complicated version of #2099.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#31362; Package emacs. Full text available.

Message received at 31362 <at> debbugs.gnu.org:


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From: Andreas Schwab <schwab@HIDDEN>
To: Tino Calancha <tino.calancha@HIDDEN>
Subject: Re: bug#31362: 24.5; Crash after eval a form
References: <87h8nnhn8j.fsf@HIDDEN>
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On Mai 04 2018, Tino Calancha <tino.calancha@HIDDEN> wrote:

> ;; Emacs crash after evaluate the following form:
> (let* ((lst (list 'x))
>        (form (cons 'die
>                    (list 'w '(pop lst)))))
>   (while lst
>     (setq form
>           (cons 'die
>                 (cons form
>                       (list '(pop lst))))))
>   form)

This creates a degenerate list, causing stack overflow during GC.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
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Information forwarded to bug-gnu-emacs@HIDDEN:
bug#31362; Package emacs. Full text available.

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From: Tino Calancha <tino.calancha@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 24.5; Crash after eval a form
Date: Fri, 04 May 2018 16:51:56 +0900
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emacs -Q
;; Emacs crash after evaluate the following form:
(let* ((lst (list 'x))
       (form (cons 'die
                   (list 'w '(pop lst)))))
  (while lst
    (setq form
          (cons 'die
                (cons form
                      (list '(pop lst))))))
  form)

;; Same behavior in Emacs 25, 26 and master.
;; The crash seems to happen because of the following assert (lisp.h:1468) fails:
INLINE ptrdiff_t
SCHARS (Lisp_Object string)
{
  ptrdiff_t nchars = XSTRING (string)->u.s.size;
  eassume (0 <= nchars);
  return nchars;
}

In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
 of 2017-09-12 on hullmann, modified by Debian
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 --sharedstatedir=/var/lib --libexecdir=/usr/lib
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japanese hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese case-table epa-hook jka-cmpr-hook help simple abbrev
minibuffer nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote make-network-process
dbusbind gfilenotify dynamic-setting system-font-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 71508 4550)
 (symbols 48 17556 0)
 (miscs 40 38 88)
 (strings 32 9162 4602)
 (string-bytes 1 250704)
 (vectors 16 8910)
 (vector-slots 8 383182 18774)
 (floats 8 63 238)
 (intervals 56 244 4)
 (buffers 960 12))




Acknowledgement sent to Tino Calancha <tino.calancha@HIDDEN>:
New bug report received and forwarded. Copy sent to eggert@HIDDEN, monnier@HIDDEN, bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to eggert@HIDDEN, monnier@HIDDEN, bug-gnu-emacs@HIDDEN:
bug#31362; Package emacs. Full text available.
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Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.