i3 causes xorg to leak memory

[sander85]

I'm submitting a…

[x] Bug
[ ] Feature Request
[ ] Documentation Request
[ ] Other (Please describe in detail)

Current Behavior

Over time I see xorg memory usage grow into huge numbers (10GB+)

Expected Behavior

X should never take so much memory.

Reproduction Instructions

I'm not quite sure how to reproduce it. I'm just running the latest (4.19) i3 and see the problem happening on 2 systems.

Environment

Output of i3 --moreversion 2>&-:

i3 version: 
Binary i3 version:  4.19 (2020-11-15) © 2009 Michael Stapelberg and contributors
Running i3 version: 4.19 (2020-11-15) (pid 5322)
Loaded i3 config: /home/sander/.config/i3/config (Last modified: E 04 jaan  2021 08:13:52 EET, 14953 seconds ago)

The i3 binary you just called: /usr/bin/i3
The i3 binary you are running: i3

Config file

Doesn't look like a config problem, it started happening after upgrade to new version (from 4.17).

Logfile URL:

- Linux Distribution & Version: Mageia 7/Cauldron
- Are you using a compositor (e.g., xcompmgr or compton): bot that I know...

I didn't see this problem in 4.17. I first upgraded my Mageia cauldron to use 4.18 and the problem started there. At that time I didn't connect it to i3 as xrestop doesn't show anything interesting. About a week ago I upgraded both systems (Mageia 7 and Mageia cauldron) to 4.19 and can now see the memory problem on both.

pmap of the xorg process is showing mi this line:

0000000002147000 1460256K rw--- [ anon ] (overall memory usage at the time is ~1,8GB).

I need some guiding on how to debug this further.

[i3bot]

I don’t see a link to logs.i3wm.org. Did you follow https://i3wm.org/docs/debugging.html? (In case you actually provided a link to a logfile, please ignore me.)

[snprajwal]

Please provide a link to both the i3 and Xorg log files (You can find X logs at .local/share/xorg/Xorg.0.log). Also, I am running the same version of i3 and am not facing any such issue. Please try reinstalling the xorg and i3 packages on your system.

[psychon]

Another idea is: What does xrestop say why memory is used? Does it perhaps even include the "large" memory?
For me (i3 4.19.1-non-git), i3 causes 64 MiB of pixmap memory to be used, way more than everything else together. I think this is because of #3479 (at least in my case).