A bit of background: I have a core scene, which additively loads other scenes as the levels. When they go out of range, those levels are supposed to be destroyed… and here seems to be where my troubles come in. Each “root” piece of a level contains a component called UnloadableLevelPiece which destroys itself if it matches the ID of the scene we are trying to unload.
With that in mind… This happens when I try to unload a scene. Specifically, it happens immediately after I try to unload a scene, which IIRC is when things marked by Destroy actually get destroyed. Given the number of times “Canvas” appears here, I’m fairly certain this is a beta-related bug. (There are a number of world-space canvases in the scene being unloaded. To confirm the cause, I tried deleting all of these object from the scene, and it no longer crashes when unloading.)
I’ve made a bug report on this, but I’m wondering if anyone else has come across similar problems.
Receiving unhandled NULL exception#0 0x00000000ebc862 in UI::Canvas::GetRenderMode() const#1 0x00000000ec3b57 in UI::CompareFunc(ListNodeUI::Canvas const&, ListNodeUI::Canvas const&)#2 0x00000000ec21ae in void std::__unguarded_linear_insert<__gnu_cxx::__normal_iterator<UI::Canvas**, std::vector<UI::Canvas*, std::allocatorUI::Canvas* > >, UI::Canvas*, bool ()(ListNodeUI::Canvas const&, ListNodeUI::Canvas const&)>(__gnu_cxx::__normal_iterator<UI::Canvas**, std::vector<UI::Canvas , std::allocatorUI::Canvas* > >, UI::Canvas*, bool ()(ListNodeUI::Canvas const&, ListNodeUI::Canvas const&))#3 0x00000000ebf8d8 in void std::sort<__gnu_cxx::__normal_iterator<UI::Canvas**, std::vector<UI::Canvas , std::allocatorUI::Canvas* > >, bool ()(ListNodeUI::Canvas const&, ListNodeUI::Canvas const&)>(__gnu_cxx::__normal_iterator<UI::Canvas**, std::vector<UI::Canvas , std::allocatorUI::Canvas* > >, __gnu_cxx::__normal_iterator<UI::Canvas**, std::vector<UI::Canvas*, std::allocatorUI::Canvas* > >, bool ()(ListNodeUI::Canvas const&, ListNodeUI::Canvas const&))#4 0x00000000ec3bfe in UI::CanvasManager::SortList()#5 0x00000000ebba81 in UI::Canvas::AwakeFromLoad(AwakeFromLoadMode)#6 0x000000009e58f9 in AwakeFromLoadQueue::InvokePersistentManagerAwake(AwakeFromLoadQueue::Item , unsigned int, AwakeFromLoadMode, void ()(Object&, TypeTree const&))#7 0x000000009e54eb in AwakeFromLoadQueue::PersistentManagerAwakeFromLoad(AwakeFromLoadMode, void ( )(Object&, TypeTree const&))#8 0x000000009f0b9d in PersistentManager::IntegrateAllThreadedObjectsStep2(AwakeFromLoadQueue&)#9 0x000000008c795b in CompleteAwakeSequence(std::string const&, AwakeFromLoadQueue&)#10 0x000000008c788f in PostLoadLevelAdditive(std::string const&, AwakeFromLoadQueue&)#11 0x0000000086cb63 in PreloadLevelOperation::IntegrateMainThread()#12 0x0000000086b72d in PreloadManager::UpdatePreloadingSingleStep(bool)#13 0x0000000086c0f6 in PreloadManager::UpdatePreloading()#14 0x00000000868d73 in PlayerLoop(bool, bool, IHookEvent*)#15 0x0000000149ffc9 in Application::UpdateScene(bool)#16 0x0000000149c599 in Application::UpdateSceneIfNeeded()#17 0x0000000149b5d5 in Application::TickTimer()#18 0x0000000168aee8 in -[EditorApplication TickTimer]#19 0x00000096582a2b in __NSFireTimer#20 0x000000935e4ea6 in CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION #21 0x000000935e4863 in __CFRunLoopDoTimer#22 0x0000009365f06d in __CFRunLoopDoTimers#23 0x0000009359c353 in __CFRunLoopRun#24 0x0000009359b9ea in CFRunLoopRunSpecific#25 0x0000009359b84b in CFRunLoopRunInMode#26 0x0000009589db5d in RunCurrentEventLoopInMode#27 0x0000009589d8e2 in ReceiveNextEventCommon#28 0x0000009589d6bd in _BlockUntilNextEventMatchingListInModeWithFilter#29 0x00000099699349 in _DPSNextEvent#30 0x00000099698870 in -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]#31 0x0000009968b15c in -[NSApplication run]#32 0x00000099673ff8 in NSApplicationMain#33 0x0000000169e69b in EditorMain(int, char const**)#34 0x0000000169edd8 in main#35 0x00000000002d75 in start
*** Launching bug reporter due to crashbug.ZN2UI11CompareFuncERK8ListNodeINS_6CanvasEES4 + 39ZSt25__unguarded_linear_insertIN9__gnu_cxx17__normal_iteratorIPPN2UI6CanvasESt6vectorIS4_SaIS4_EEEES4_PFbRK8ListNodeIS3_ESD_EEvT_T0_T1 + 94ZSt4sortIN9__gnu_cxx17__normal_iteratorIPPN2UI6CanvasESt6vectorIS4_SaIS4_EEEEPFbRK8ListNodeIS3_ESD_EEvT_SG_T0 + 152CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION + 22
couple questions, it looks like your on a android device, does it happen in editor as well? Also what beta version are you on?
This is only in the editor. I have not yet attempted to reproduce this on either Android or iOS on-device.
4.6b20
Hmm ok please report a bug with your use case, we’d love to fix any crashes.