Description

This is a common crash affecting Mac users on 4.16, it has occurred since at least 4.14.

Users have not provided any descriptions.

Steps to Reproduce

repro steps currently unknown

Code in question involves handling the plugging in an iOS device while the editor is running. In the case it's crashing, the device info returned is invalid for some reason. Maybe the user pressed "don't trust"?

Callstack
CoreFoundation!Unknown()
UE4Editor-IOSTargetPlatform.dylib!FIOSDeviceHelper::DoDeviceConnect()
MobileDevice!<Unknown>
MobileDevice!<Unknown>
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
CoreFoundation!Unknown()
UE4Editor-Core.dylib!PerformBlockOnThread(FCocoaRunLoopSource&, void()
UE4Editor-Core.dylib!FMacApplication::UpdateScreensArray()
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>

Callstack from Log

SIGSEGV: invalid attempt to access memory at address 0x0

LogMac: CFStringGetLength() Address = 0x7d83ff4a (filename not found) [in CoreFoundation]
FIOSDeviceHelper::DoDeviceConnect(void*) Address = 0x4ceb656d (filename not found) [in UE4Editor-IOSTargetPlatform.dylib]
_AMDDeviceAttachedCallbackv3() Address = 0x8d34c038 (filename not found) [in MobileDevice]
_USBMuxCustomRunLoopSourcePerformCallback() Address = 0x8d2c903e (filename not found) [in MobileDevice]
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__() Address = 0x7d8d7321 (filename not found) [in CoreFoundation]
__CFRunLoopDoSources0() Address = 0x7d8b821d (filename not found) [in CoreFoundation]
__CFRunLoopRun() Address = 0x7d8b7716 (filename not found) [in CoreFoundation]
CFRunLoopRunSpecific() Address = 0x7d8b7114 (filename not found) [in CoreFoundation]
PerformBlockOnThread(FCocoaRunLoopSource&, void () block_pointer, NSArray*, NSString*, bool) Address = 0x31c2a5a  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::UpdateScreensArray() Address = 0x31cb219  (filename not found) [in UE4Editor-Core.dylib]
FMacApplication::ProcessDeferredEvents(float) Address = 0x31cae90  (filename not found) [in UE4Editor-Core.dylib]
FSlateApplication::TickPlatform(float) Address = 0x4aec9db  (filename not found) [in UE4Editor-Slate.dylib]
FSlateApplication::Tick(ESlateTickType) Address = 0x4aebe14  (filename not found) [in UE4Editor-Slate.dylib]
FEngineLoop::Tick() Address = 0x2f1780c  (filename not found) [in UE4Editor]
GuardedMain(wchar_t const*) Address = 0x2f1de12  (filename not found) [in UE4Editor]
-[UE4AppDelegate runGameThread:] Address = 0x2f2c01a  (filename not found) [in UE4Editor]
-[FCocoaGameThread main] Address = 0x31c2346  (filename not found) [in UE4Editor-Core.dylib]
__NSThread__start__() Address = 0x7f2dab3d (filename not found) [in Foundation]
_pthread_body() Address = 0x9324a93b (filename not found) [in libsystem_pthread.dylib]
_pthread_body() Address = 0x9324a887 (filename not found) [in libsystem_pthread.dylib]
thread_start() Address = 0x9324a08d (filename not found) [in libsystem_pthread.dylib]

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Fixed
ComponentPlatform - Mobile
Affects Versions4.144.154.164.17
Target Fix4.17
Fix Commit3547861
Main Commit3596628
Release Commit3547861
CreatedJul 20, 2017
ResolvedJul 21, 2017
UpdatedSep 16, 2019