it crashed on background when eval

[taocheng-njfu]

when I run it on background，it crashed，how can I catch the exception？
libc++abi: terminating due to uncaught exception of type std::runtime_error: [METAL] Command buffer execution failed: Insufficient Permission (to submit GPU work from background) (00000006:kIOGPUCommandBufferCallbackErrorBackgroundExecutionNotPermitted)

[davidkoski]

If it is an exception that can be caught by the caller, you can use either of these:

• https://swiftpackageindex.com/ml-explore/mlx-swift/main/documentation/mlx/checkedeval(_:)-7a4cs
• https://swiftpackageindex.com/ml-explore/mlx-swift/main/documentation/mlx/witherror(_:)-6g4wn

If that doesn't work then the exception may be in the C++ threads that manage the work queue -- that would likely require work in mlx::core (the mlx repo).

[angeloskath]

It seems to be in an iOS device, does the information at https://developer.apple.com/documentation/BackgroundTasks/performing-long-running-tasks-on-ios-and-ipados?language=objc help?

Basically see if requesting permission to submit GPU work from the background works.

[taocheng-njfu]

If it is an exception that can be caught by the caller, you can use either of these:

• https://swiftpackageindex.com/ml-explore/mlx-swift/main/documentation/mlx/checkedeval(_:)-7a4cs
• https://swiftpackageindex.com/ml-explore/mlx-swift/main/documentation/mlx/witherror(_:)-6g4wn

If that doesn't work then the exception may be in the C++ threads that manage the work queue -- that would likely require work in mlx::core (the mlx repo).

I tried 2 plans, but none of them took effect, and it still crashed.

[taocheng-njfu]

It seems to be in an iOS device, does the information at https://developer.apple.com/documentation/BackgroundTasks/performing-long-running-tasks-on-ios-and-ipados?language=objc help?

Basically see if requesting permission to submit GPU work from the background works.

iOS 26 is ok，system version below iOS 26 is not work