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In Progress in 6000.6.X
Votes
7
Found in
6000.0.68f1
6000.3.10f1
6000.4.0b10
6000.5.0a7
6000.6.0a1
Issue ID
UUM-135394
Regression
No
Crash on ConstraintProjectionTree::projectionTreeBuildStep when ConfigurableJoint uses JointProjectionMode.PositionAndRotation and connected Rigidbody switches from kinematic to non-kinematic
Steps to Reproduce:
1. Open the “user’s attached project”
2. Open the “ReproScene”
3. Enter Play Mode
4. Wait a few seconds and observe the crash
Reproducible with versions: 6000.0.68f1, 6000.3.10f1, 6000.4.0b10, 6000.5.0a7
Reproducible on: macOS 15.7.2 (M1 Max), Windows 11 (user’s)
Not reproducible on: no other environment tested
Notes:
- Also reproducible in Standalone Player
- If projectionMode is set to None (or projection is not enabled), the crash does not occur
First few lines of StackTrace:
#0 0x00000103caa260 in physx::Sc::ConstraintProjectionTree::projectionTreeBuildStep(physx::Sc::ConstraintGroupNode&, physx::Sc::ConstraintSim*, physx::Sc::ConstraintGroupNode*)
#1 0x00000103cc9d1c in physx::Sc::ConstraintProjectionManager::processPendingUpdates(physx::PxcScratchAllocator&)
#2 0x00000103cad53c in physx::Sc::Scene::simulate(float, physx::PxBaseTask)
#3 0x000001009e5f54 in PhysicsCommands::PhysX::Simulate(void*, PhysicsCommands::Context const&, PhysicsCommands::Command&)
#4 0x00000102abfd14 in PhysicsScene::Simulate(JobFence&, float, float, bool)
0x00007FFF1661F792 (Unity) physx::Sc::ConstraintProjectionTree::projectionTreeBuildStep
0x00007FFF16614518 (Unity) physx::Sc::ConstraintProjectionTree::buildProjectionTrees
0x00007FFF1670DEAE (Unity) physx::Sc::ConstraintProjectionManager::processPendingUpdates
0x00007FFF166266E3 (Unity) physx::Sc::Scene::stepSetupCollide
0x00007FFF166264C6 (Unity) physx::Sc::Scene::simulate
Comments (3)
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Vincenzo
Mar 31, 2026 06:49
Can we solve this for LTS 6.3 please?
alexrvn
Mar 30, 2026 11:14
Heya, It is in the process of being fixed. Probably state hasn't updated yet on this page.
Cheers,
AlexRvn.
zalogic
Mar 24, 2026 11:13
100% repro crash should NOT be under consideration all the way for Unity 6000.6.x version.