Unreal Engine Issues

UE-36749

Crash on exit PIE when playing with more than one player on Linux

Crash on exit PIE when playing with more than one player on Linux

UDN
Description

When playing in non-single player game in the editor (either set # players or check dedicated server checkbox), the editor will crash when the play session ends.

Regression:
Yes - editor does not crash on exit in 4.12.5

Working CL - 3039270
Broken CL - 3106830

Steps to Reproduce
  1. Open UE4 Editor on Linux
  2. In Play Dropdown, set number of players to 2
  3. PIE
  4. Exit PIE

Result:
Editor immediately crashes on exit

Expected:
Play session ends and editor returns to edit mode.

Callstack
[2016.10.03-19.08.00:190][773]LogNet: Client netspeed is 10000
[2016.10.03-19.08.00:190][773]LogNet: Join request: /Engine/Maps/Entry?SplitscreenCount=1
[2016.10.03-19.08.00:193][773]LogNet: Join succeeded: 257
Signal 11 caught.
Malloc Size=131076 LargeMemoryPoolOffset=131092 
CommonLinuxCrashHandler: Signal=11
Malloc Size=65535 LargeMemoryPoolOffset=196655 
[2016.10.03-19.08.09:100][273]LogCrashTracker: 


[2016.10.03-19.08.09:101][273]LogLinux: === Critical error: ===
Unhandled Exception: SIGSEGV: invalid attempt to access memory at address 0xf88b9650

[2016.10.03-19.08.09:101][273]LogLinux: Fatal error!

[Callstack]  00  0x00007f112ae5025f  FLinuxPlatformStackWalk::CaptureStackBackTrace(unsigned long long*, unsigned int, void*)
[Callstack]  01  0x00007f112ad2d395  FGenericPlatformStackWalk::StackWalkAndDump(char*, unsigned long, int, void*)
[Callstack]  02  0x00007f112ae0ec81  FLinuxCrashContext::CaptureStackTrace()
[Callstack]  03  0x00007f112002f3a0  CommonLinuxCrashHandler(FGenericCrashContext const&)
[Callstack]  04  0x00007f112ae134f4  PlatformCrashHandler(int, siginfo_t*, void*)
[Callstack]  05  0x00007f112bc9b3d0  /lib/x86_64-linux-gnu/libpthread.so.0(+0x113d0) [0x7f112bc9b3d0]
[Callstack]  06  0x00007f112a7b3be7  TSet<UObjectBase*, DefaultKeyFuncs<UObjectBase*, false>, FDefaultSetAllocator>::Remove(UObjectBase*)
[Callstack]  07  0x00007f112a7a28f5  UnhashObject(UObjectBase*)
[Callstack]  08  0x00007f112a751b93  UObjectBase::LowLevelRename(FName, UObject*)
[Callstack]  09  0x00007f112a693f95  UObject::BeginDestroy()
[Callstack]  10  0x00007f112a6a0137  UObject::ConditionalBeginDestroy()
[Callstack]  11  0x00007f112a61f273  CollectGarbageInternal(EObjectFlags, bool)
[Callstack]  12  0x00007f112a61fcf7  CollectGarbage(EObjectFlags, bool)
[Callstack]  13  0x00007f1121842bb6  UEditorEngine::EndPlayMap()
[Callstack]  14  0x00007f112134b272  UEditorEngine::Tick(float, bool)
[Callstack]  15  0x00007f1121bc0250  UUnrealEdEngine::Tick(float, bool)
[Callstack]  16  0x0000000000420dba  FEngineLoop::Tick() [Runtime/Core/Public/Stats/Stats2.h, line 1673]
[Callstack]  17  0x00000000004256fa  GuardedMain(wchar_t const*) [/home/doug/Documents/github/4.13.1/Engine/Source/Runtime/Launch/Private/Launch.cpp, line 156]
[Callstack]  18  0x00007f112002fd1b  CommonLinuxMain(int, char**, int (*)(wchar_t const*))
[Callstack]  19  0x00007f111f54d830  /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xf0) [0x7f111f54d830]
[Callstack]  20  0x0000000000413869  /home/doug/Documents/github/4.13.1/Engine/Binaries/Linux/UE4Editor(_start+0x29) [0x413869]

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Cannot Reproduce
ComponentUE - Platform - Linux
Affects Versions4.13, 4.13.1
CreatedOct 3, 2016
ResolvedMay 17, 2018
UpdatedMay 25, 2018
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