From the crash log, this is a classic iOS “watchdog” termination (sometimes called the 0x8BADF00D crash). In short, iOS killed the app because it took too long (about 30 seconds) to finish launching or handling a scene-creation event while in the background. Here’s how we know:
- Termination Code
- The crash log shows EXC_CRASH (SIGKILL) with a termination namespace of FRONTBOARD.
- The details reference code: 0x8BADF00D explanation: scene-create watchdog transgression: ... exhausted real (wall clock) time allowance of 29.91 seconds.
- 0x8BADF00D is Apple’s internal code for a watchdog timeout.
- What Triggers a Watchdog Timeout?
- On iOS, if an app blocks the main thread or otherwise fails to complete certain tasks (e.g., scene creation) within a strict time limit, iOS will forcibly terminate it to prevent a poor user experience.
- In this report, the “watchdog event” is scene-create. That means the app was taking too long while setting up its UI scene.
- Evidence in the Stack Trace
- The main thread stack (com.apple.main-thread) shows calls into SwiftUI’s layout engine (e.g., AttributeGraph, DynamicViewList, _ZStackLayout.sizeThatFits, etc.) along with AVFoundation calls (AVPlayerItem initWithURL, FigAssetRemoteCreateWithURL).
- All these calls appear to be happening synchronously on the main thread. If they stall (e.g., blocking network I/O, heavy computation, or repeated layout passes), it can lead to hitting that 30‑second limit.
- Key Takeaway
- The system watchdog gave the app ~30 seconds to finish “scene creation,” but it used up that time—likely waiting on synchronous network or layout operations—so iOS stepped in and killed it.
How to Fix or Avoid This
- Move heavy tasks off the Main Thread.
- Any expensive operations (e.g., large synchronous layouts, network requests, or video asset loads) should be done asynchronously or in background threads.
- Keep Scene Creation Lightweight.
- Particularly during scene-create or application(_:didFinishLaunchingWithOptions, avoid network calls or large synchronous initializations. SwiftUI’s layout engine can also be expensive if you’re inflating large view hierarchies at once.
- Use Lazy Loading or Progressive Display.
- If you are fetching a video (or other large data) right at startup, consider delaying that load until after the initial UI is visible or loading it in the background so the main thread doesn’t get stalled.
By addressing these points, you can prevent the watchdog from terminating your app for exceeding the time limit.