GUI freezes randomly when a string input field is active (Linux)

[Hume2]

When a string input field is active (that means, when I press keys, it writes something into it) (the chat does it also), the GUI sometimes freezes for a long time. The memory or CPU usage doesn't seem to exceed reasonable bounds, just the GUI doesn't react. When I send SIGTERM to Minetest, it closes quickly.

EDIT: When I press Ctrl, Shift or Alt, it unfreezes.

OS: Ubuntu 18.04
CPU: Intel® Core™ i3-6100U CPU @ 2.30GHz × 4
GPU: Intel® HD Graphics 520 (SKL GT2)

[sfan5]

Please build IrrlichtMt with examples enabled and see if you can reproduce this in 05.UserInterface.

[Hume2]

Yes, it happens there also.

[Hume2]

It looks like the GUI unfreezes when I press Ctrl.

[JosiahWI]

What's a good way to reproduce this issue now that the examples have been scrapped?

[sfan5]

You can add that particular one back locally, I'm sure it still compiles. Or alternatively test in MT of course.

[JosiahWI]

Couldn't repro in Minetest or in 05.UserInterface example, but I did not try for very long. @Hume2 do you have any more specific instructions for how I can be sure I can or can't reproduce this issue?

[sfan5]

possibly related minetest/minetest#13473

[sfan5]

I think I can reproduce these too, now. Didn't happen before.
Specifically with the chat console.

Minetest 5.9.0-dev-dfba22758 (Linux)
Using Irrlicht 1.9.0mt15
Using LuaJIT 2.1.1702233742
Built by GCC 13.2
Running on Linux/6.7.4-arch1-1 x86_64
BUILD_TYPE=RelWithDebInfo
RUN_IN_PLACE=1
USE_CURL=1
USE_GETTEXT=1
USE_SOUND=1
STATIC_SHAREDIR="."
STATIC_LOCALEDIR="locale"

with the SDL device