[BUG] ACF-based vehicles randomly breaking and then crashing the server

[edshot99]

Short Description

Bug that i've noticed recently where my server will randomly crash because of player's ACF vehicles despite there being nothing wrong with the vehicles.

Branch and Version

Workshop version server and client side.

Console Error Logs (Optional)

EDSHOT: !noclip
Crazy origin, angles, velocity, angular velocity on entity [271][gmod_wire_expression2]
        Origin:           [-nan, -nan, nan]
        Angles:           [-nan, nan, 180.000000]
        Velocity:         [-nan, -nan, nan]
        Angular Velocity: [-nan, -nan, nan]
Defusing!
Removing!
Crazy origin, angles, velocity, angular velocity on entity [306][prop_physics]
        Origin:           [-nan, -nan, nan]
        Angles:           [-nan, nan, 180.000000]
        Velocity:         [-nan, -nan, nan]
        Angular Velocity: [-nan, -nan, nan]
Defusing!
Removing!
*** ERROR *** Excessive sizelevel (41) for element
[sizelevel message repeats]
*** ERROR *** Excessive sizelevel (168) for element
IVP Failed at ../ivp_utility/ivu_vhash.cxx 157
IVP Failed at ../ivp_utility/ivu_vhash.cxx 157

IVP Failed at ../ivp_utility/ivu_vhash.cxx 157

cat: hlds.1568736.pid: No such file or directory
email debug.log to [email protected]
Mon Sep 30 01:59:26 UTC 2024: Server restart in 10 seconds

How to Reproduce (Optional)

With other people's vehicles, i'm not sure. It's pretty random. With this one tank I have all I have to do is use it for a bit and then it randomly breaks. Other times I can just flip it upside down and wiggle it around until it breaks (listen for the gearbox click in the video) and falls through the world.

Screenshots (Optional)

https://github.com/user-attachments/assets/67baff1e-cb40-47c8-a7e6-5d0495bf3fcb

Additional Information (Optional)

Tested this on three other servers with ACF and they crash as well.

I also noticed that when props are being deleted from falling through the world that normally it should be a non 'nan' value and the last prop to be deleted before completely breaking is the prop used in the upper part of the tank that has all the Wiremod components.

[wrefgtzweve]

Seems to be a generic crazyphysics crash, are you sure that its not the E2 on the tank that's doing this? I don't think that ACF-3 does much in terms of velocity except for recoil and explosions.

[thecraftianman]

Could you provide the dupe that's having issues? I haven't seen this problem happen anywhere else.

[ghost]

Seems to be a generic crazyphysics crash, are you sure that its not the E2 on the tank that's doing this? I don't think that ACF-3 does much in terms of velocity except for recoil and explosions.

I thought so too, but i've only seen this happen with ACF dupes and if the E2 moved any part of the tank outside of the world it'll typically be removed properly.

I do have a feeling the problem might be related to everything being multi-parented to the base plate except for the E2 and Wire components, but i'm not too sure.

Could you provide the dupe that's having issues? I haven't seen this problem happen anywhere else.

I'll have to ask the person who created the tank first since it isn't mine.

[ghost]

hawk_tuah_tank.txt