Unstable core features

[Noobulater]

Hi all, love the work you are all doing here, but recently ran into an issue with some core features, such as setting position and velocity data, leading to a WASM unreachable error.

This instability was almost enough to make me swap physics libaries, so I hope it gets addressed.

Here's the situation: This is on a Velocity based Kinematic body. I need to run 1-15 "TICKS" as fast as possible, each completing a round trip of user input -> update bodies with new forces -> run physics simulation -> report body's physics state back to the simulation. However, doing so at a high frequency will lead to a crash (not guarenteed, and more frequent the higher the tick rate)

[Noobulater]

if (p != null)
    body.setTranslation(new Vector3(p[0], p[1], p[2]))

  if (q != null)
    body.setRotation(new Quaternion(q[0] || 0, q[1] || 0, q[2] || 0, q[3] || 1))

  if (v != null)
    body.setLinvel(new Vector3(v[0], v[1], v[2]))

  if (aV != null)
    body.setAngvel(new Vector3(aV[0], aV[1], aV[2]))

for (const cID in components) {
      const { Controller, body, rigidBodyCollider, grounded } = components[cID]
      if (Controller && rigidBodyCollider) {
        const vel = body.linvel()

        if (vel.x > 0 || vel.x < 0)
          vel.x /= body.mass()

        if (vel.y > 0 || vel.y < 0)
          vel.y /= body.mass()

        if (vel.z > 0 || vel.z < 0)
          vel.z /= body.mass()

        if (grounded)
          vel.y = 0
        else
          vel.y -= 0.25

        Controller.computeColliderMovement(
          rigidBodyCollider,           // The collider we would like to move.
          vel, // The movement we would like to apply if there wasn’t any obstacle.
        )
        const movement = Controller.computedMovement()
        if (movement.x > 0 || movement.x < 0)
          movement.x /= physics.timestep
        if (movement.y > 0 || movement.y < 0)
          movement.y /= physics.timestep
        if (movement.z > 0 || movement.z < 0)
          movement.z /= physics.timestep

        body.setLinvel(movement)

        components[cID].grounded = Controller.computedGrounded()
      }
    }

Relevant code in case it helps. All values are of the right type.

[Noobulater]

Tried downgrading to 0.11.1, but still got the issue.

Edit: After a lot of attempts to diagonse this, I still get the issue, but I can't recreate a state where it fails consistently. The snapshot I load when the error occurs work if loaded manually, which makes me think there is some sort of race condition internally with the library.

This issue is a deal breaker for me and sadly I can't use this library until it's addressed.

[Noobulater]

Got this reply on the discord, but not sure it works since I've switched off the library

Hello. 
I encountered this problem once. It was caused by some references of Rapier body objects that were kept in an array after the bodies were removed from the physics world. I think it messed up the lifecycle somehow.
I fixed it by only keeping their "handle" and not a reference to the full object.
I hope it can help.