bug#43389: 28.0.50; Emacs memory leaks using hard disk all time

[Eli Zaretskii <eliz@gnu.org>]

> From: Arthur Miller <arthur.miller@live.com>
> Cc: Jean Louis <bugs@gnu.support>,  fweimer@redhat.com,
>   43389@debbugs.gnu.org,  dj@redhat.com,  michael_heerdegen@web.de,
>   trevor@trevorbentley.com,  carlos@redhat.com
> Date: Mon, 23 Nov 2020 18:19:32 +0100
> 
> > The glibc malloc is the prime suspect anyway.  I don't really believe Emacs had
> > such a glaring memory leak.
> 
> This has to be something introduced fairly recently, right?

Maybe, I'm not sure.  Since we introduced the pdumper, we use malloc
somewhat differently, and OTOH glibc removed some of the malloc hooks
we used to use in versions of Emacs before 26.  In addition, glibc is
also being developed, and maybe some change there somehow triggered
this.

As you see, there's more than one factor that could possibly be
related.

> I didn't have any such problems before, but since maybe few weeks ago, I
> have also experienced heavy lockdowns of my entire OS. To the point
> where entire X11 got unresposnsive, when it happens I can't even switch
> to terminal to kill Emacs. What I do is Alt-Shift to another virtual
> linux console. I don't even need to log into the system in that console,
> I can then Alt-Shift 1 to go back to one I am logged into, and
> everything is normal. Emacs is every time restarted by systemd and
> everything is repsonsive and working as normal. 
> 
> This started sometime ago; and I have noticed that it happens when I was
> cleaning my disk and reading big directories in Dired (I have some with
> ~7k-10k files in them). I was using Helm to complete paths when I was
> shifting fiels and folders around. After maybe hour or so I would
> experience big slowdown. I don't have swap file on my system enabled at
> all, so I am not sure what was going, but I didn't have time to
> participate in this memory leak thing yet. I haven't experienced any
> problems since I recompiled Emacs last time, which was in 18th (last
> Wendesday). I have recompiled without Gtk this time, but I have no idea
> if it has anything to do with the issue, was just a wild shot to see if
> things are better.

If the problem is memory, I suggest to look at the system log to see
if there are any signs of that.