GNU bug report logs - #28108
25.2; Infinite loop due to circular marker list?

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Adam Porter <adam <at> alphapapa.net>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.2; Infinite loop due to circular marker list?
Date: Wed, 16 Aug 2017 00:01:00 -0500

While doing what I would consider typical Emacs actions for me, editing
Org buffers, refiling capture items, editing elisp files, etc, Emacs
became unresponsive and pegged the CPU at 100% usage.  C-g had no
effect, and neither did sending the SIGUSR2 signal.

I'm not much of a C programmer, nor am I experienced with gdb, but I
attached to the Emacs process and stepped through, and every line was
the same:

src/marker.c:605: for (tail = BUF_MARKERS (b); tail; prev =
&tail->next, tail = *prev)

Eli Zaretskii helped me step through with a defined stepping command:

https://www.reddit.com/r/emacs/comments/6tyiym/debugging_infinite_loop_in_emacs_2522_core/dlosrfh/

After stepping forward over 50 times, it seems that every step gives
essentially the same output, e.g.:

(gdb) my-step
605           for (tail = BUF_MARKERS (b); tail; prev = &tail->next,
tail = *prev)
$1 = (struct Lisp_Marker *) 0x22284168
$2 = 358821460
$3 = (struct Lisp_String *) 0x15632e50
"rubbish.py"
$4 = 23
(gdb) my-step
605           for (tail = BUF_MARKERS (b); tail; prev = &tail->next,
tail = *prev)
$5 = (struct Lisp_Marker *) 0x22284140
$6 = 358821460
$7 = (struct Lisp_String *) 0x15632e50
"rubbish.py"
$8 = 23

The only thing that changes is the number after "(struct Lisp_Marker
*)", which decreases each time.  After the 63rd stepping, it is now
0x22283730; all of the other numbers are the same.

I regret that I do not recall exactly what steps I took immediately
before the infinite loop began, but I think it was probably something
like finalizing an Org-mode capture.

Since I'm not aware of any unusual activity before the loop began, I
don't know how to reproduce it.  I'm using another Emacs process to
write this report, and it's working fine doing all the typical
activities I use it for, including Org capture, with the same
configuration.

If I can, I will leave the stuck process up so I can gather more data if
necessary.

Thanks for your help.

In GNU Emacs 25.2.2 (x86_64-pc-linux-gnu, GTK+ Version 3.10.8)
 of 2017-08-05, modified by Debian built on machine
Windowing system distributor 'The X.Org Foundation', version 11.0.11701000
System Description: Ubuntu 14.04.5 LTS

Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --build x86_64-linux-gnu
 --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.2/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.2/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-x=yes --with-x-toolkit=gtk3
 --with-toolkit-scroll-bars 'CFLAGS=-g -O2 -fstack-protector
 --param=ssp-buffer-size=4 -Wformat -Werror=format-security -Wall'
 CPPFLAGS=-D_FORTIFY_SOURCE=2 'LDFLAGS=-Wl,-Bsymbolic-functions
 -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Text

Minor modes in effect:
  which-key-mode: t
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  global-flycheck-mode: t
  flycheck-mode: t
  global-auto-revert-mode: t
  desktop-save-mode: t
  delete-selection-mode: t
  override-global-mode: t
  shell-dirtrack-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
M-SPC M-f is undefined
Quit
Undo!
(New file)
Wrote /tmp/alpha-aa3fe.txt
Mark set [3 times]
Quit
Mark set [2 times]
Indent region with <left>, <right>, <S-left>, or <S-right>.
Auto-saving...done

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/home/me/.emacs.d/elpa/org-plus-contrib-20170210/org-faces hides
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/home/me/.emacs.d/elpa/org-plus-contrib-20170210/ob-matlab hides
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/home/me/.emacs.d/elpa/org-plus-contrib-20170210/org-eshell hides
/usr/share/emacs/25.2/lisp/org/org-eshell
/usr/share/emacs25/site-lisp/flim/ntlm hides /usr/share/emacs/25.2/lisp/net/ntlm
/usr/share/emacs25/site-lisp/flim/sasl hides /usr/share/emacs/25.2/lisp/net/sasl
/usr/share/emacs25/site-lisp/flim/sasl-digest hides
/usr/share/emacs/25.2/lisp/net/sasl-digest
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/usr/share/emacs25/site-lisp/flim/hmac-def hides
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/home/me/.emacs.d/elpa/tabulated-list-20120406.1351/tabulated-list
hides /usr/share/emacs/25.2/lisp/emacs-lisp/tabulated-list
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/usr/share/emacs/25.2/lisp/emacs-lisp/seq

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Memory information:
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Message #8 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Adam Porter <adam <at> alphapapa.net>
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Wed, 16 Aug 2017 17:28:50 +0300

> From: Adam Porter <adam <at> alphapapa.net>
> Date: Wed, 16 Aug 2017 00:01:00 -0500
> 
> I'm not much of a C programmer, nor am I experienced with gdb, but I
> attached to the Emacs process and stepped through, and every line was
> the same:
> 
> src/marker.c:605: for (tail = BUF_MARKERS (b); tail; prev =
> &tail->next, tail = *prev)

Can you show the output of

  (gdb) bt full

?

Message #11 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Adam Porter <adam <at> alphapapa.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Wed, 16 Aug 2017 13:27:09 -0500

[Message part 1 (text/plain, inline)]

On Wed, Aug 16, 2017 at 9:28 AM, Eli Zaretskii <eliz <at> gnu.org> wrote:
>
> Can you show the output of
>
>   (gdb) bt full
>
> ?

Here you go.  I see from the Lisp backtrace at the bottom that it may
be related to one of my packages, but I haven't had any problems like
this with it before, and I haven't updated it for about 4 months, so
there's nothing new there.

Thanks.

[bt_full.txt (text/plain, attachment)]

Message #14 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Adam Porter <adam <at> alphapapa.net>
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Thu, 17 Aug 2017 18:09:01 +0300

> From: Adam Porter <adam <at> alphapapa.net>
> Date: Wed, 16 Aug 2017 13:27:09 -0500
> Cc: 28108 <at> debbugs.gnu.org
> 
> Here you go.  I see from the Lisp backtrace at the bottom that it may
> be related to one of my packages, but I haven't had any problems like
> this with it before, and I haven't updated it for about 4 months, so
> there's nothing new there.

No, it isn't necessarily related to that package, because the problem
happened during GC.  Your package just happened to trigger GC.

Can you try typing the following command definition, and then running
the command?  When you run it, does GDB also hang indefinitely?

  (gdb) define count-markers
   > set $count = 0
   > set $markers = BUF_MARKERS(b)
   > while $markers != 0
    > set $count = $count + 1
    > print $count
    > set $markers = $markers->next
    > end
   > end
  (gdb) count-markers

Message #17 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: adam <at> alphapapa.net
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Thu, 17 Aug 2017 21:31:02 +0300

> Date: Thu, 17 Aug 2017 18:09:01 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 28108 <at> debbugs.gnu.org
> 
> Can you try typing the following command definition, and then running
> the command?  When you run it, does GDB also hang indefinitely?
> 
>   (gdb) define count-markers
>    > set $count = 0
>    > set $markers = BUF_MARKERS(b)
>    > while $markers != 0
>     > set $count = $count + 1
>     > print $count
>     > set $markers = $markers->next
>     > end
>    > end
>   (gdb) count-markers

I just realized that it might be good to say a few more words.

This command will print a long list of increasing numbers, as it walks
the linked list of buffer markers and counts them.  If it never ends,
you should be able to interrupt it with Ctrl-C, but please do let it
some serious time to run before you give up.  In any case, please tell
the last number it prints.

Thanks.

Message #20 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Adam Porter <adam <at> alphapapa.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Thu, 17 Aug 2017 23:06:56 -0500

Hi Eli,

I'm sorry but that didn't work:

(gdb) define count-markers
Type commands for definition of "count-markers".
End with a line saying just "end".
>set $count = 0
>set $markers = BUF_MARKERS(b)
>while $markers != 0
 >set $count = $count + 1
 >print $count
 >set $markers = $markers->next
 >end
>end
(gdb) count-markers
No symbol "BUF_MARKERS" in current context.

I tried to run count-markers after "bt full", "my-step", and "step",
but it still didn't work:

(gdb) step
605           for (tail = BUF_MARKERS (b); tail; prev = &tail->next,
tail = *prev)
(gdb) count-markers
No symbol "BUF_MARKERS" in current context.

Unfortunately I may have to shut down this machine soon.  I searched
for "gdb save state" and found some information about
checkpoint/restart, but I'm not sure if that would work or be
appropriate here.  I'll try to keep the system up until we can finish
debugging this, but if I can't, I guess we'll be stuck, since I have
no idea how to reproduce it.

By the way, a few minutes ago I got a strange crash in another Emacs
process, a segfault in libtasn1.so.6.2.0. It seemed clipboard-related,
because it happened when I right-clicked on the URL bar in my browser
to paste a link I had copied to the clipboard: the browser froze, a
process used 100% CPU (not sure which one), and then Emacs crashed.

I don't think it's related--at least, not directly--but it is unusual.

Thanks for your help.

On Thu, Aug 17, 2017 at 1:31 PM, Eli Zaretskii <eliz <at> gnu.org> wrote:
>> Date: Thu, 17 Aug 2017 18:09:01 +0300
>> From: Eli Zaretskii <eliz <at> gnu.org>
>> Cc: 28108 <at> debbugs.gnu.org
>>
>> Can you try typing the following command definition, and then running
>> the command?  When you run it, does GDB also hang indefinitely?
>>
>>   (gdb) define count-markers
>>    > set $count = 0
>>    > set $markers = BUF_MARKERS(b)
>>    > while $markers != 0
>>     > set $count = $count + 1
>>     > print $count
>>     > set $markers = $markers->next
>>     > end
>>    > end
>>   (gdb) count-markers
>
> I just realized that it might be good to say a few more words.
>
> This command will print a long list of increasing numbers, as it walks
> the linked list of buffer markers and counts them.  If it never ends,
> you should be able to interrupt it with Ctrl-C, but please do let it
> some serious time to run before you give up.  In any case, please tell
> the last number it prints.
>
> Thanks.

Message #23 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Adam Porter <adam <at> alphapapa.net>
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Fri, 18 Aug 2017 09:12:35 +0300

> From: Adam Porter <adam <at> alphapapa.net>
> Date: Thu, 17 Aug 2017 23:06:56 -0500
> Cc: 28108 <at> debbugs.gnu.org
> 
> (gdb) define count-markers
> Type commands for definition of "count-markers".
> End with a line saying just "end".
> >set $count = 0
> >set $markers = BUF_MARKERS(b)
> >while $markers != 0
>  >set $count = $count + 1
>  >print $count
>  >set $markers = $markers->next
>  >end
> >end
> (gdb) count-markers
> No symbol "BUF_MARKERS" in current context.

Replace this:

  >set $markers = BUF_MARKERS(b)

with this:

  >set $markers = b->text->markers

You will have to redefine the whole command again with that change.

> I tried to run count-markers after "bt full", "my-step", and "step",
> but it still didn't work:
> 
> (gdb) step
> 605           for (tail = BUF_MARKERS (b); tail; prev = &tail->next,
> tail = *prev)
> (gdb) count-markers
> No symbol "BUF_MARKERS" in current context.

It should be run from the same stack frame where you have this loop.
Whether you run "bt full" before that doesn't matter.

> Unfortunately I may have to shut down this machine soon.  I searched
> for "gdb save state" and found some information about
> checkpoint/restart, but I'm not sure if that would work or be
> appropriate here.  I'll try to keep the system up until we can finish
> debugging this, but if I can't, I guess we'll be stuck, since I have
> no idea how to reproduce it.

OK, just keep these instructions for when it reproduces itself again.

Thanks.

Message #26 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Adam Porter <adam <at> alphapapa.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Fri, 18 Aug 2017 14:51:53 -0500

On Fri, Aug 18, 2017 at 1:12 AM, Eli Zaretskii <eliz <at> gnu.org> wrote:

> Replace this:
>
>   >set $markers = BUF_MARKERS(b)
>
> with this:
>
>   >set $markers = b->text->markers
>
> You will have to redefine the whole command again with that change.

That brought up a different error:

(gdb) define count-markers
Redefine command "count-markers"? (y or n) y
Type commands for definition of "count-markers".
End with a line saying just "end".
>set $count = 0
>set $markers = b->text->markers
>while $markers != 0
 >set $count = $count +1
 >print $count
 >set $markers = $markers->next
 >end
>end
(gdb) count-markers
value has been optimized out
(gdb) step
605           for (tail = BUF_MARKERS (b); tail; prev = &tail->next,
tail = *prev)
(gdb) count-markers
value has been optimized out

Message #29 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Adam Porter <adam <at> alphapapa.net>
Cc: 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Sat, 19 Aug 2017 09:55:47 +0300

> From: Adam Porter <adam <at> alphapapa.net>
> Date: Fri, 18 Aug 2017 14:51:53 -0500
> Cc: 28108 <at> debbugs.gnu.org
> 
> (gdb) count-markers
> value has been optimized out

I give up.  Thanks for your efforts.

Message #32 received at 28108 <at> debbugs.gnu.org (full text, mbox):

From: Adam Porter <adam <at> alphapapa.net>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 28108-done <at> debbugs.gnu.org, 28108 <at> debbugs.gnu.org
Subject: Re: bug#28108: 25.2; Infinite loop due to circular marker list?
Date: Sat, 19 Aug 2017 20:21:21 -0500

On Sat, Aug 19, 2017 at 1:55 AM, Eli Zaretskii <eliz <at> gnu.org> wrote:
>> From: Adam Porter <adam <at> alphapapa.net>
>> Date: Fri, 18 Aug 2017 14:51:53 -0500
>> Cc: 28108 <at> debbugs.gnu.org
>>
>> (gdb) count-markers
>> value has been optimized out
>
> I give up.  Thanks for your efforts.

I do as well; I finally rebooted the machine.  Who knows, maybe it was
a cosmic ray.  Sorry for taking up your time on this.  However, thanks
for teaching me a bit about gdb.  I'll use these techniques in the
future.  Please keep up the good work on Emacs.

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