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From: Lynn Winebarger <owinebar@gmail.com>
To: Eli Zaretskii <eliz@gnu.org>
Cc: Michael Albinus <michael.albinus@gmx.de>,
	emacs-devel <emacs-devel@gnu.org>
Subject: Re: Loading tramp for dump goes into infinite regress
Date: Wed, 27 Jul 2022 04:31:30 -0400	[thread overview]
Message-ID: <CAM=F=bBUUp-XND54fjALYjcUCj=UwP5Zz24ZcQoaG698QWFVaw@mail.gmail.com> (raw)
In-Reply-To: <CAM=F=bBkqgStSuGMqBKXc6O1cpZ3FtkGNE2dBqwhjWZpP9x4qA@mail.gmail.com>

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On Tue, Jul 26, 2022, 10:48 PM Lynn Winebarger <owinebar@gmail.com> wrote:

> On Tue, Jul 26, 2022 at 8:58 PM Lynn Winebarger <owinebar@gmail.com>
> wrote:
> > I was still seeing some runaway allocation even with native
> > compilation completely disabled, so I finally fired up gdb and found
> > the culprit:  "lmalloc", which has a comment saying the "while (true)"
> > loop shouldn't iterate on a modern platform.  RHEL 7.9 isn't hot off
> > the presses, but it's not that ancient.
> > I'll try to replicate on a personal machine and file a bug, but it's
> > not clear what triggers the condition. When it does occur, it always
> > occurs at the same place.  One instance was from loading cc-mode in
> > site-load (after byte-compiling all the dependencies in the correct
> > order).  I wrapped the "defun c-init-language-vars-for" sexp in an
> > eval, based on a comment in another one of the cc-* files (i.e.
> > cargo-cult programming on my part), and that stopped the runaway
> > allocation.  But then it happened while loading ibuffer.el.
>
> Wrong again - the infinite loop is in pure_alloc.  It looks like there
> is a 10,655 character string in ibuffer.el on which pure_copy is being
> called, and pure_alloc only adds increments of 10k.
> This I can report as a bug.
>

The segmentation faults I've seen are also coming from purecopy.  It's
attempting to traverse a cyclic lisp structure and overflows the stack.

I'm going guess this kind of thing is why Stefan Monnier and Pip Cet were
enthusiastic about ditching pure space.

Lynn

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  reply	other threads:[~2022-07-27  8:31 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-24  0:47 Loading tramp for dump goes into infinite regress Lynn Winebarger
2022-07-24  7:55 ` Michael Albinus
2022-07-24 12:05   ` Lynn Winebarger
2022-07-24 12:23     ` Eli Zaretskii
2022-07-24 13:30       ` Lynn Winebarger
2022-07-24 13:34         ` Eli Zaretskii
2022-07-24 14:05           ` Lynn Winebarger
2022-07-24 14:09             ` Eli Zaretskii
2022-07-24 14:28               ` Lynn Winebarger
2022-07-24 16:00             ` Lynn Winebarger
2022-07-24 16:20               ` Lynn Winebarger
2022-07-24 16:31                 ` Eli Zaretskii
2022-07-25 12:49                   ` Lynn Winebarger
2022-07-25 13:56                     ` Eli Zaretskii
2022-07-26 11:24                       ` Lynn Winebarger
2022-07-27  0:58                         ` Lynn Winebarger
2022-07-27  2:48                           ` Lynn Winebarger
2022-07-27  8:31                             ` Lynn Winebarger [this message]
2022-08-09 12:29                       ` Lynn Winebarger
2022-08-09 12:36                         ` Po Lu
2022-08-09 13:22                           ` Lynn Winebarger
2022-08-09 13:42                             ` Po Lu
2022-08-09 15:55                               ` Lynn Winebarger
2022-07-25 16:54                     ` Stefan Monnier
2022-07-25 17:05                       ` Stefan Monnier
2022-07-26  0:28                       ` Lynn Winebarger
2022-07-26  1:10                         ` Lynn Winebarger
2022-08-06  6:07                       ` Lynn Winebarger
2022-08-06 12:57                         ` Lynn Winebarger
2022-08-06 15:39                           ` Lynn Winebarger
2022-08-06 20:23                             ` Working fully native-compiled "mega dump" (was Re: Loading tramp for dump goes into infinite regress) Lynn Winebarger
2022-08-06 20:52                               ` Lynn Winebarger
2022-07-25 20:11                     ` Loading tramp for dump goes into infinite regress Andrea Corallo
2022-07-31 20:22                       ` Lynn Winebarger
2022-08-03  9:58                         ` Lynn Winebarger
2022-08-03 12:22                           ` Eli Zaretskii
2022-08-03 14:53                             ` Native-compilation build process (was Re: Loading tramp for dump goes into infinite regress) Lynn Winebarger
2022-08-03 16:15                               ` Eli Zaretskii
2022-08-04  3:33                                 ` Lynn Winebarger
2022-08-05  1:57                                   ` Lynn Winebarger
2022-07-24 16:23               ` Loading tramp for dump goes into infinite regress Eli Zaretskii

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