MATLAB macOS R2025b: exit crash after nonlinear optimization when GTSAM is built with TBB

[dellaert]

Description

MATLAB exits with a segmentation fault after running nonlinear optimization through the MATLAB wrapper when GTSAM is built with GTSAM_WITH_TBB=ON on macOS.

The same installed toolbox exits cleanly if no optimization is run, and rebuilding GTSAM with GTSAM_WITH_TBB=OFF removes the crash.

Steps to reproduce

1. Configure and install GTSAM with the MATLAB toolbox enabled and TBB enabled.

cmake -S . -B build \
  -DGTSAM_INSTALL_MATLAB_TOOLBOX=ON \
  -DGTSAM_WITH_TBB=ON
cmake --build build -j6
cmake --install build

2. Start MATLAB and add the installed toolbox root to the path.

3. Run this minimal repro:

restoredefaultpath
addpath('/Users/dellaert/gtsam_toolbox')
import gtsam.*

priorNoise = noiseModel.Diagonal.Sigmas([0.3;0.3;0.1]);
odometryNoise = noiseModel.Diagonal.Sigmas([0.2;0.2;0.1]);

graph = NonlinearFactorGraph;
graph.add(PriorFactorPose2(1, Pose2(0,0,0), priorNoise));
graph.add(BetweenFactorPose2(1,2,Pose2(2,0,0), odometryNoise));
graph.add(BetweenFactorPose2(2,3,Pose2(2,0,0), odometryNoise));

initial = Values;
initial.insert(1, Pose2(0.5,0,0.2));
initial.insert(2, Pose2(2.3,0.1,-0.2));
initial.insert(3, Pose2(4.1,0.1,0.1));

optimizer = LevenbergMarquardtOptimizer(graph, initial);
result = optimizer.optimizeSafely();
exit

4. MATLAB crashes during exit with a segmentation fault.

Expected behavior

MATLAB should exit cleanly after optimization.

Environment

• GTSAM commit: 23147828906c2df50c4772f2863de332c7d92f67
• MATLAB: 25.2.0.3177638 (R2025b) Update 5
• OS: macOS 26.3.2 on Apple Silicon
• Installed toolbox path used for repro: /Users/dellaert/gtsam_toolbox

Additional information

• restoredefaultpath; addpath('/Users/dellaert/gtsam_toolbox'); exit exits cleanly.
• import gtsam.*; Pose2(); exit exits cleanly.
• Evaluating graph.error(initial) exits cleanly.
• Constructing LevenbergMarquardtOptimizer(graph, initial) without running optimization exits cleanly.
• Explicitly deleting wrapped objects before exit does not prevent the crash.
• Setting TBB_NUM_THREADS=1 does not prevent the crash.
• OdometryExample also reproduces the same exit crash with TBB enabled.
• Rebuilding with -DGTSAM_WITH_TBB=OFF makes the same repro exit cleanly.

[ProfFan]

Would be useful to get a MATLAB crash stack trace (I know there is one based on my memory)