Unreal Engine Issues and Bug Tracker (UE-46069)

Developer Notes

A fix has been made in 4.16.2 for half these crashes, and another fix will be in 4.17 for the remainder.

Description

This is a common crash among Mac users in 4.16. It is spread out among many separate CrashGroups, with slight variations in Callstack.

Some Example CrashGroups
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Crash Details from Log File

LogStreaming:Warning: Failed to read file '../../../Engine/Content/Tutorial/InWorldBlueprintEditing/TutorialAssets/whatYouAreMaking.png' error.
LogSlate: Could not find file for Slate resource: ../../../Engine/Content/Tutorial/InWorldBlueprintEditing/TutorialAssets/whatYouAreMaking.png
LogSlate: Took 0.000112 seconds to synchronously load lazily loaded font '../../../Engine/Content/Editor/Slate/Fonts/Roboto-Italic.ttf' (157K)
LogMac:Error: appError called: Assertion failed: Assertion failed: IsValid() [File:Runtime/Core/Public/Templates/SharedPointer.h] [Line: 835] 

LogCrashTracker: 

LogMac: === Critical error: ===
SIGSEGV: invalid attempt to access memory at address 0x3

LogMac: FGenericPlatformMisc::RaiseException(unsigned int) Address = 0xb30af1b  (filename not found) [in UE4Editor-Core.dylib]
FOutputDeviceMacError::Serialize(wchar_t const*, ELogVerbosity::Type, FName const&) Address = 0xb506d7f  (filename not found) [in UE4Editor-Core.dylib]
FOutputDevice::Logf(wchar_t const*, ...) Address = 0xb5e788d  (filename not found) [in UE4Editor-Core.dylib]
FDebug::AssertFailed(char const*, char const*, int, wchar_t const*, ...) Address = 0xb54dafe  (filename not found) [in UE4Editor-Core.dylib]
__31-[FCocoaTextView selectedRange]_block_invoke Address = 0xb478ebc  (filename not found) [in UE4Editor-Core.dylib]
invocation function for block in PerformBlockOnThread(FCocoaRunLoopSource&, void () block_pointer, NSArray*, NSString*, bool) Address = 0xb52a770  (filename not found) [in UE4Editor-Core.dylib]
FCocoaRunLoopSource::Process(__CFString const*) Address = 0xb4c27a4  (filename not found) [in UE4Editor-Core.dylib]
-[FCocoaRunLoopSourceInfo perform] Address = 0xb4c21f6  (filename not found) [in UE4Editor-Core.dylib]
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__() Address = 0xbfaed321 (filename not found) [in CoreFoundation]
__CFRunLoopDoSources0() Address = 0xbface21d (filename not found) [in CoreFoundation]
__CFRunLoopRun() Address = 0xbfacd716 (filename not found) [in CoreFoundation]
CFRunLoopRunSpecific() Address = 0xbfacd114 (filename not found) [in CoreFoundation]
PerformBlockOnThread(FCocoaRunLoopSource&, void () block_pointer, NSArray*, NSString*, bool) Address = 0xb4c313a  (filename not found) [in UE4Editor-Core.dylib]
bool MainThreadReturn<bool>(bool () block_pointer, NSString*) Address = 0xb514a03  (filename not found) [in UE4Editor-Core.dylib]
FMacTextInputMethodSystem::DeactivateContext(TSharedRef<ITextInputMethodContext, (ESPMode)0> const&) Address = 0xb514d87  (filename not found) [in UE4Editor-Core.dylib]
FSlateEditableTextLayout::HandleFocusLost(FFocusEvent const&) Address = 0x11be2886 (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::SetUserFocus(FSlateUser*, FWidgetPath const&, EFocusCause) Address = 0x1181b882 (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::SetUserFocus(unsigned int, FWidgetPath const&, EFocusCause) Address = 0x1181ea0f (filename not found) [in UE4Editor-Slate.dylib]
...more in log file...

User Descriptions

Right clicking repeatedly (3-4 times in a row) in a Blueprints event graph consistently causes UE4 to crash on macOS Sierra.

Steps to Reproduce

Repro steps currently unknown. Tried the user description of multiple right-clicks in Event Graph, but no crash. There was slight lag, but no Ensure either.

Callstack

SEGV_MAPERR at 0x3

UE4Editor-Core.dylib!<Unknown>
UE4Editor-Core.dylib!<Unknown>
UE4Editor-Core.dylib!FCocoaRunLoopSource::Process()
UE4Editor-Core.dylib!<Unknown>
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
UE4Editor-Core.dylib!PerformBlockOnThread(FCocoaRunLoopSource&, void()
UE4Editor-Core.dylib!bool MainThreadReturn<bool>(bool()
UE4Editor-Core.dylib!FMacTextInputMethodSystem::DeactivateContext(TSharedRef<ITextInputMethodContext,()
UE4Editor-Slate.dylib!FSlateEditableTextLayout::HandleFocusLost()
UE4Editor-Slate.dylib!FSlateApplication::SetUserFocus()
UE4Editor-Slate.dylib!FSlateApplication::SetUserFocus()
UE4Editor-Slate.dylib!FSlateApplication::RoutePointerDownEvent()
UE4Editor-Slate.dylib!FSlateApplication::ProcessMouseButtonDownEvent(TSharedPtr<FGenericWindow,()
UE4Editor-Slate.dylib!FSlateApplication::OnMouseDown(TSharedPtr<FGenericWindow,()
UE4Editor-Core.dylib!FMacApplication::ProcessMouseDownEvent(FDeferredMacEvent const&, TSharedPtr<FMacWindow,()
UE4Editor-Core.dylib!FMacApplication::ProcessEvent()
UE4Editor-Core.dylib!FMacApplication::ProcessDeferredEvents()
UE4Editor-Slate.dylib!FSlateApplication::TickPlatform()
UE4Editor-Slate.dylib!FSlateApplication::Tick()
UE4Editor!FEngineLoop::Tick()
UE4Editor!GuardedMain()
UE4Editor!<Unknown>
UE4Editor-Core.dylib!<Unknown>
Foundation!Unknown()
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>
libsystem_pthread.dylib!<Unknown>

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Fixed

Component	UE - Platform - Apple
Affects Versions	4.16
Target Fix	4.16.2, 4.17

Fix Commit	3498735
Main Commit	3617655
Release Commit	3544326

Created	Jun 14, 2017
Resolved	Jun 19, 2017
Updated	Apr 27, 2018

View Jira Issue

UE-46069

[CrashReport] Assertion on Mac in FCocoaRunLoopSource

[CrashReport] Assertion on Mac in FCocoaRunLoopSource

Developer Notes

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