kgdrenefort
Apprentice
Joined: 19 Sep 2023
Posts: 295
Location: Somewhere in the 77
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 Posted: Wed May 22, 2024 4:20 pm Post subject: Seeking volounters, test bug in Minetest for Mineclonia mob |
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Hello,
I have come across server crash for minetestserver (5.8.0), using mineclonia mod.
The problem:
Very often, while hitting any mobs or animal added by this mod, the server crash. Sometimes it was not, but mostly, it was a plain crash.
After opening a bug here : https://codeberg.org/mineclonia/mineclonia/issues/1444
Turns out the problem is confirmed in this circumstance: Using a compiled version of the game without using luajit to compile it with their current code, which has a bug (and a fix, now). In my case, lua5.1.
But once you compile it with luajit, without changing any codes, it works as it should be.
Also, the fix they added removes completely any needs for using luajit, the bug has been fixed since my report, which is nice. It does not crash any more after my test.
The need:
I would like this bug to be reproduced on other system. It's pretty much easy. Specially since Gentoo's default use flag don't use luajit, so this bugs would have been avoided anyway if I was using luajit.
Reproducing the bug as me.
Reproducing the bug, as reporting the results:
I. First, vanilla compilation without the bug fix
1/ Install minetest with, possibly, the server flag. But I really think it'll happen nonetheless if you just host your own game from the client. Be sure it does use lua5.1, not luajit (this is important):
Should return you lua version, as 5.1, not luajit.
2/ Install from here the codeberg's code : https://codeberg.org/mineclonia/mineclonia
a) Go into the .minetest directory of the user that will run the game.
| Code: | | mkdir ~/.minetest/games && cd ~/.minetest/games && git clone https://codeberg.org/mineclonia/mineclonia |
3) Check if you use the buggy version of the code:
a)
| Code: | | cd ~/.minetest/games/mineclonia |
b)
| Code: | | git checkout fix_criticals_crash |
(it should answer there is no such file ! If it does reply an error, you are not running the non-patched version to fix that bug, which is needed here !)
c) If b is good:
(should answer you are using this branch)
4) Run the game from command line (to get the output when it crashes), possibly a server aside, or host your own, with the game mode mineclonia. No other mods.
5) Hit anything that is moving, with hands or sword or axe, no cares, only in melee tho.
6) If it crash, report it as well these informations:
a)
It'll also show which lua was used, 5.1 or luajit. It has to be 5.1 !
b) Show us the use flag used to compile minetest as well, still neat.
c) The crash's output, complaining about lua.
d) Anything you might find relevant.
Good !
II. Applying the patch to verify, without luajit, if it does not crash anymore, if it was.
Now before recompiling minetest using luajit, backup your ~/.minetest directory and download the fix as well:
| Code: | | cp -a ~/.minetest ~/.minetest_unpatched |
| Code: | | cd ~/.minetest/games/mineclonia |
| Code: | | git fetch -u origin fix_criticals_crash:fix_criticals_crash |
| Code: | | git checkout fix_criticals_crash |
Now that the patch is applied. Reproduce the bug as above, report as well if it crash or not.
III. Removing the patch, compiling minetest with luajit and avoiding the crash.
Now, please, add this to your packages.use for minetest:
| Code: | | LUA_SINGLE_TARGET: -* luajit |
Recompile minetest.
Be sure to have this output concerning lua before anything please:
| Code: | Minetest 5.8.0 (Linux)
Using Irrlicht 1.9.0mt13
Using LuaJIT 2.1.0-beta3
BUILD_TYPE=Release
RUN_IN_PLACE=0
USE_CURL=1
USE_GETTEXT=1
USE_SOUND=1
STATIC_SHAREDIR="/usr/share/minetest"
STATIC_LOCALEDIR="/usr/share/minetest/locale"
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Using LuaJit.
It will remove any luaX.X and let luajit pre-compile the lua code, which is… a way to avoid the bug.
Revert the backup:
| Code: | | rm -rf ~/.minetest && cp -a ~/.minetest_unpatched ~/.minetest |
Try to reproduce the bug, and repeat the process to bring information here.
It should not crash either with luajit and the non-fixed code.
IV. Final goal
I'll myself report (or link this topic) to the developers of mineclonia. Some math were incorrect, leading to this crash. Even if luajit is fixing it, it's better to solve it for good, don't you think ?
Also, depending, would recommend or discuss with the maintainers of minetest of Gentoo if it would be nice to add luajit as default, since it seems it could prevent some bugs ? I'm not an expert, but the suggestion would be bringed.
Also, I think that is something worth being added in the wiki, which I am ready to, but would like to have confirmed reproduction of the behaviour if not using luajit. It could help peoples in the future to avoid crash or other bugs, maybe. Still neat to know.
Thanks for you time to help improving this game and this popular mods.
Regards,
GASPARD DE RENEFORT Kévin
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