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b/371512414 This issue had no reproduction but the stacktrace was provided. The theory of this fix is that the `ImageResult` type is capturing something that doesn't handle being copied and deallocated twice so instead of copying it, we std::move it into a shared_ptr so that it will only be deallocated once. Also, I just avoid using a `std::move` when overflowing. The idea here is maybe sometimes deleting the std::move'd item isn't kosher. We know from the stacktrace that it has something to do with overflowing because that would be the only case where something is being deleted. I've added 2 integration tests that exercises the code where the crash appears to be happening. This is good coverage to have but neither of them reproduced the issue, even with MallocScribble enabled. That's the best we can do without a reproduction. ``` Thread 7 (id: 0x0000a103)crashed 0x000000010a48ae8c(Flutter -function.h)std::_fl::allocator<impeller::ContextMTL::PendingTasks>::destroy[abi:v15000](impeller::ContextMTL::PendingTasks*) 0x000000010a48b9fc(Flutter -allocator_traits.h:309)impeller::ContextMTL::StoreTaskForGPU(std::_fl::function<void ()> const&, std::_fl::function<void ()> const&) 0x000000010a48b9fc(Flutter -allocator_traits.h:309)impeller::ContextMTL::StoreTaskForGPU(std::_fl::function<void ()> const&, std::_fl::function<void ()> const&) 0x000000010a4d49e4(Flutter -image_decoder_impeller.cc:422)std::_fl::__function::__func<flutter::ImageDecoderImpeller::UploadTextureToPrivate(std::_fl::function<void (sk_sp<flutter::DlImage>, std::_fl::basic_string<char, std::_fl::char_traits<char>, std::_fl::allocator<char>>)>, std::_fl::shared_ptr<impeller::Context> const&, std::_fl::shared_ptr<impeller::DeviceBuffer> const&, SkImageInfo const&, std::_fl::shared_ptr<SkBitmap> const&, std::_fl::optional<SkImageInfo> const&, std::_fl::shared_ptr<fml::SyncSwitch> const&)::$_1, std::_fl::allocator<flutter::ImageDecoderImpeller::UploadTextureToPrivate(std::_fl::function<void (sk_sp<flutter::DlImage>, std::_fl::basic_string<char, std::_fl::char_traits<char>, std::_fl::allocator<char>>)>, std::_fl::shared_ptr<impeller::Context> const&, std::_fl::shared_ptr<impeller::DeviceBuffer> const&, SkImageInfo const&, std::_fl::shared_ptr<SkBitmap> const&, std::_fl::optional<SkImageInfo> const&, std::_fl::shared_ptr<fml::SyncSwitch> const&)::$_1>, void ()>::operator()() 0x000000010a06c234(Flutter -function.h:512)fml::SyncSwitch::Execute(fml::SyncSwitch::Handlers const&) const 0x000000010a4d42f8(Flutter -image_decoder_impeller.cc:408)flutter::ImageDecoderImpeller::UploadTextureToPrivate(std::_fl::function<void (sk_sp<flutter::DlImage>, std::_fl::basic_string<char, std::_fl::char_traits<char>, std::_fl::allocator<char>>)>, std::_fl::shared_ptr<impeller::Context> const&, std::_fl::shared_ptr<impeller::DeviceBuffer> const&, SkImageInfo const&, std::_fl::shared_ptr<SkBitmap> const&, std::_fl::optional<SkImageInfo> const&, std::_fl::shared_ptr<fml::SyncSwitch> const&) 0x000000010a4d3838(Flutter -image_decoder_impeller.cc:538)std::_fl::__function::__func<flutter::ImageDecoderImpeller::Decode(fml::RefPtr<flutter::ImageDescriptor>, unsigned int, unsigned int, std::_fl::function<void (sk_sp<flutter::DlImage>, std::_fl::basic_string<char, std::_fl::char_traits<char>, std::_fl::allocator<char>>)> const&)::$_1, std::_fl::allocator<flutter::ImageDecoderImpeller::Decode(fml::RefPtr<flutter::ImageDescriptor>, unsigned int, unsigned int, std::_fl::function<void (sk_sp<flutter::DlImage>, std::_fl::basic_string<char, std::_fl::char_traits<char>, std::_fl::allocator<char>>)> const&)::$_1>, void ()>::operator()() 0x000000010a06dd1c(Flutter -function.h:512)fml::ConcurrentMessageLoopDarwin::ExecuteTask(std::_fl::function<void ()> const&) 0x000000010a06737c(Flutter -concurrent_message_loop.cc:101)void* std::_fl::__thread_proxy[abi:v15000]<std::_fl::tuple<std::_fl::unique_ptr<std::_fl::__thread_struct, std::_fl::default_delete<std::_fl::__thread_struct>>, fml::ConcurrentMessageLoop::ConcurrentMessageLoop(unsigned long)::$_0>>(void*) 0x000000021d4ff378(libsystem_pthread.dylib + 0x00006378)_pthread_start ``` [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style