YanBo_AI

iOS线上偶现卡死： fml::AutoResetWaitableEvent::Wait()

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### 请描述遇到的问题，以及您所期望的正确的结果 线上偶现的crash， 暂无复现步骤 ``` Thread 0 name: com.apple.main-thread (cpu_usage: 0.00%) libsystem_kernel.dylib ___psynch_cvwait (in libsystem_kernel.dylib) libsystem_pthread.dylib __pthread_cond_wait$VARIANT$mp (in libsystem_pthread.dylib) Flutter std::_fl::condition_variable::wait(std::_fl::unique_lock&) (in Flutter:condition_variable.cpp:46) Flutter fml::AutoResetWaitableEvent::Wait() (in Flutter:waitable_event.cc:75) Flutter flutter::Shell::OnPlatformViewDestroyed() (in...