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

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Markus Triska <markus.triska <at> gmx.at>
Subject: bug#2099: closed (GC stack overflow fixed)
Date: Mon, 04 Apr 2022 17:25:02 +0000

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Your bug report

#31362: stack overflow in GC when creating large nested object

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 2099 <at> debbugs.gnu.org.

-- 
31362: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=31362
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Mattias Engdegård <mattiase <at> acm.org>
To: 31362-done <at> debbugs.gnu.org, 46900-done <at> debbugs.gnu.org
Cc: Noam Postavsky <npostavs <at> gmail.com>, Pip Cet <pipcet <at> gmail.com>,
 Tino Calancha <tino.calancha <at> gmail.com>
Subject: GC stack overflow fixed
Date: Mon, 4 Apr 2022 19:24:06 +0200

Now that bug#54698 is resolved, we can close bug#31362 and bug#46900 which seem to have been about that, essentially.

If that didn't do it for you, please let us know.

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From: Markus Triska <markus.triska <at> gmx.at>
To: emacs-pretest-bug <at> gnu.org
Subject: 23.0.60; `mark_object' with larger nested objects crashes Emacs
Date: Thu, 29 Jan 2009 00:06:45 +0100 (CET)

When you do:

   $ emacs -Q --eval "(let (v) (while t (setq v (cons v v))))"

then Emacs crashes with:

   Program received signal EXC_BAD_ACCESS, Could not access memory.
   Reason: KERN_INVALID_ADDRESS at address: 0xbf7ffffc
   0x0013bc1a in mark_object (arg=40166541) at alloc.c:5372
   (gdb) bt
   #0  0x0013bc1a in mark_object (arg=40166541) at alloc.c:5372
   #1  0x0013bdf8 in mark_object (arg=40166549) at alloc.c:5655
   #2  0x0013bdf8 in mark_object (arg=40166557) at alloc.c:5655
   #3  0x0013bdf8 in mark_object (arg=40166565) at alloc.c:5655
   #4  0x0013bdf8 in mark_object (arg=40166573) at alloc.c:5655
   #5  0x0013bdf8 in mark_object (arg=40166581) at alloc.c:5655
   #6  0x0013bdf8 in mark_object (arg=40166589) at alloc.c:5655
   ...

Throwing an error or making GC stackless seems much preferable here.

In GNU Emacs 23.0.60.1 (i386-apple-darwin8.11.1, GTK+ Version 2.12.9)
 of 2009-01-28 on mt-computer.local
Windowing system distributor `The XFree86 Project, Inc', version 11.0.40400000
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_GB.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

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