GNU bug report logs - #70352
29.3.50; emacs-pgtk: possible leak of virtual memory

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#70352: closed (29.3.50; emacs-pgtk: possible leak of virtual
 memory)
Date: Fri, 10 May 2024 06:35:01 +0000

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

Your message dated Fri, 10 May 2024 09:34:24 +0300
with message-id <864jb65g5r.fsf <at> gnu.org>
and subject line Re: bug#70352: Fwd: Re: bug#70352: 29.3.50; emacs-pgtk: possible leak of virtual memory
has caused the debbugs.gnu.org bug report #70352,
regarding 29.3.50; emacs-pgtk: possible leak of virtual memory
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
70352: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=70352
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Yang Yingchao <yang.yingchao <at> qq.com>
To: bug-gnu-emacs <at> gnu.org,Yang Yingchao <yang.yingchao <at> qq.com>
Subject: 29.3.50; emacs-pgtk: possible leak of virtual memory
Date: Fri, 12 Apr 2024 18:56:17 +0800

I'm testing Emacs built with Pgtk (with GTK-4.12.5), and I suspect there
may be a memory leak in virtual memory.


Steps to reproduce:

1. Start Emacs with "-Q --bg-daemon=mytest".
2. Connect to the server with 'emacsclient -c -s mytest'. This will create a new frame.
3. Kill the newly created frame with `\C-x\C-c`.
4. Repeat steps 2 & 3, and observe `/proc/pid_of_emacs/maps`.

It seems like there could be a memory leak issue causing the increasing
number of "/memfd:gdk-wayland" entries and ultimately leading to the
crash without a core dump.


Some of my statistics are as follows:


# yyc <at> tbook in /proc/400602  [18:40:36]
$ cat maps | grep memfd | awk '{print $1}' | awk -F "-" '{sum=strtonum("0x"$2)-strtonum("0x"$1); print sum}' | awk '{sum+=$1} END {print sum}'
42688512
# yyc <at> tbook in /proc/400602  [18:40:57]
$ cat maps | grep memfd | awk '{print $1}' | awk -F "-" '{sum=strtonum("0x"$2)-strtonum("0x"$1); print sum}' | awk '{sum+=$1} END {print sum}'
51888128
# yyc <at> tbook in /proc/400602  [18:41:26]
$ cat /proc/400602/maps| grep /memfd: | wc -l
7
# yyc <at> tbook in /proc/400602  [18:41:41]
$ cat /proc/400602/maps| grep /memfd: | wc -l
9
# yyc <at> tbook in /proc/400602  [18:41:46]
$ cat /proc/400602/maps| grep /memfd: | wc -l
10
# yyc <at> tbook in /proc/400602  [18:41:51]
$ cat /proc/400602/maps| grep /memfd: | wc -l
10
# yyc <at> tbook in /proc/400602  [18:41:56]
$ cat /proc/400602/maps| grep /memfd: | wc -l
12
# yyc <at> tbook in /proc/400602  [18:42:01]
$ cat /proc/400602/maps| grep /memfd: | wc -l
12
# yyc <at> tbook in /proc/400602  [18:42:03]
$ cat /proc/400602/maps| grep /memfd:
7f0ca170a000-7f0ca1fd0000 rw-s 00000000 00:01 169719                     /memfd:gdk-wayland (deleted)
7f0ca1fd0000-7f0ca2896000 rw-s 00000000 00:01 169718                     /memfd:gdk-wayland (deleted)
7f0ca2896000-7f0ca315c000 rw-s 00000000 00:01 175557                     /memfd:gdk-wayland (deleted)
7f0ca315c000-7f0ca3a22000 rw-s 00000000 00:01 169709                     /memfd:gdk-wayland (deleted)
7f0ca3a22000-7f0ca42e8000 rw-s 00000000 00:01 169708                     /memfd:gdk-wayland (deleted)
7f0ca42e8000-7f0ca4bae000 rw-s 00000000 00:01 177320                     /memfd:gdk-wayland (deleted)
7f0ca4bae000-7f0ca5474000 rw-s 00000000 00:01 176334                     /memfd:gdk-wayland (deleted)
7f0ca5474000-7f0ca5d3a000 rw-s 00000000 00:01 175525                     /memfd:gdk-wayland (deleted)
7f0ca5d3a000-7f0ca6600000 rw-s 00000000 00:01 175517                     /memfd:gdk-wayland (deleted)
7f0ca773a000-7f0ca8000000 rw-s 00000000 00:01 175524                     /memfd:gdk-wayland (deleted)
7f0cc4381000-7f0cc47ff000 rw-s 00000000 00:01 175518                     /memfd:wayland-cursor (deleted)
7f0cc66da000-7f0cc67fa000 rw-s 00000000 00:01 175514                     /memfd:wayland-cursor (deleted)


Regards
yang

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Yang Yingchao <yang.yingchao <at> qq.com>
Cc: luangruo <at> yahoo.com, 70352-done <at> debbugs.gnu.org
Subject: Re: bug#70352: Fwd: Re: bug#70352: 29.3.50; emacs-pgtk: possible
 leak of virtual memory
Date: Fri, 10 May 2024 09:34:24 +0300

> From: Yang Yingchao <yang.yingchao <at> qq.com>
> Cc: luangruo <at> yahoo.com,  70352 <at> debbugs.gnu.org
> Date: Fri, 10 May 2024 08:00:31 +0800
> 
> On Thu, May 09 2024, Eli Zaretskii wrote:
> 
> >> As a Gentoo user, I can patch the source code on my machine locally,
> >> therefore, it would not be a real issue for me even if they don't fix it.
> >> 
> >> 
> >> Thanks for your time.
> >
> > Should we now close this bug report, or is there anything else left to
> > do here?
> 
> 
> Yes, please.

Done.

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