Total max particles: -2,147,4863,648 (negative)

Creator Hub Avatars
1

Before I go report a bug on VRChat Feedback, I am curious if anyone knows the steps to reproduce this avatar bug where the avatar details are reporting max particles as negative (-2,147,4863,648), “excellent”, and it’s treated as if there was no cap on max particles (actual behavior is like Very Poor). I have no clue, and I’ve hit a wall.

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A public avatar (avtr_267a****-****-****-****-********6a6e, SHA256 of unredacted avatar ID: 627d2cb8493de8922a9472eb5734edfdc23ae10478b89b3c03ab50ee502c7ff2) uploaded someone else with one of these was seemingly voluntarily taken down by its author today, but this bug’s been a thing for longer than a year from what I know and have previously seen.

In my past security research, I’ve tried various things such as setting max particles to 2,147,483,647 + adding a point light to overflow the number by +2, but this gets capped at positive 2,147,483,647 max particles. Unity Editor doesn’t allow setting a number higher than 2,147,483,647 max or to a negative number of particles, and my friend has also tried some editor scripts to set it to overflow or negative values - none without any success.

These avatars should probably fail security checks, but currently they do not.

2

For the record, this can also happen for mesh particle triangles.

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3

I’ve figured it out, it was nested avatars/armatures.

-2,147,483,648 max total particles (Excellent): Nested avatars/armatures can cause total max particles / mesh particle triangles to overflow into negative integers after server-side performance ranking calculations | Voters | VRChat

I accidentally ran into this server-side performance stats recalculation some weeks ago in another context when I had accidentally assigned an outfit’s FBX a generic rig and it counted against the performance stats badly.