Engine spleeping, won't show up again

Firefly74 · November 11, 2016, 1:14pm

Hey, it has allready happend to me few times, i start working on something( simple map, editor mode ), i go to eat, and when i come back, engine is “frozen dead”. ( 0 cpu )

When debugging, i see that engine is sleeping/ waiting but won’t wake up

i’m quite new to engine, but here what i found

ThreadingBase.cpp => all instanced of FQueuedThread are waiting ( in the while( bContinueWaiting ) )

not sure if relevent but
RenderingThread.cpp => FRenderingThreadTickHeartbeat is not suspended
and GRenderingThreadMaxIdleTickFrequency is on 40 ( nor sure how that value is handled/is relevent, but when i pause threads, this one showed up )

I you guys need more data feel free to ask me !

i found this post, who is 1.5y/o that looks like the same problem i have

os : W10x64 Stable

here threads states ( to copy past into np++ or similar ), might not help a lot as they all have se same names :

Sans indicateur		16196	0	Thread de travail	thread ntdll.dll	XAudio2_7.dll!00007ff99ae7fd58	Normale
Sans indicateur		1312	0	Thread principal	Thread principal	XAudio2_7.dll!00007ff99ae84612	Inférieure à la normale
Sans indicateur		9088	0	Thread de travail	UE4Editor-Core.dll!FCrashReportingThread::CrashReportingThreadProc	UE4Editor-Core.dll!FCrashReportingThread::Run	Inférieure à la normale
Sans indicateur		9168	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Inférieure à la normale
Sans indicateur		15008	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Inférieure à la normale
Sans indicateur		14988	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Inférieure à la normale
Sans indicateur		2860	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Inférieure à la normale
Sans indicateur		14996	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		15284	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		9652	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		8888	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		7752	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		1912	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		2156	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur	>	7788	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		7796	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		10040	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Inférieure à la normale
Sans indicateur		14096	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-HTTP.dll!FHttpThread::Run	Normale
Sans indicateur		9556	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Maximale
Sans indicateur		8704	0	Thread de travail	thread atidxx64.dll	atidxx64.dll!00007ff9dbd917dd	Normale
Sans indicateur		10536	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Normale
Sans indicateur		10924	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		10900	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Inférieure à la normale
Sans indicateur		4436	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Inférieure à la normale
Sans indicateur		2440	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Inférieure à la normale
Sans indicateur		5348	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Normale
Sans indicateur		2320	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Supérieure à la normale
Sans indicateur		16280	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Supérieure à la normale
Sans indicateur		15924	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Supérieure à la normale
Sans indicateur		10280	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	mswsock.dll!00007ff9e0988033	Supérieure à la normale
Sans indicateur		16060	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	mswsock.dll!00007ff9e0988033	Supérieure à la normale
Sans indicateur		16264	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Inférieure à la normale
Sans indicateur		15596	0	Thread de travail	thread XAudio2_7.dll	XAudio2_7.dll!00007ff99ae7eba7	Temps critique
Sans indicateur		16108	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Normale
Sans indicateur		15540	0	Thread de travail	thread atidxx64.dll	atidxx64.dll!00007ff9db8a41d0	Normale
Sans indicateur		15528	0	Thread de travail	thread atidxx64.dll	atidxx64.dll!00007ff9db8a41d0	Normale
Sans indicateur		16120	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		14588	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		16132	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		8924	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Normale
Sans indicateur		15572	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FEventWin::Wait	Normale
Sans indicateur		5948	0	Thread de travail	UE4Editor-Core.dll!FRunnableThreadWin::_ThreadProc	UE4Editor-Core.dll!FWindowsPlatformProcess::Sleep	Supérieure à la normale
Sans indicateur		12248	0	Thread de travail	thread ntdll.dll	ntdll.dll!00007ff9e50f8634	Normale

anonymous_user_41845f4a · November 11, 2016, 6:21pm

Hello Firefly74,

I have a few questions to get more specific about this as I personally, if not intentionally, leave the editor open for days at a time on my work PC, which goes to sleep between every shift, so we know that the reproduction isn’t that simple at least.

When you experience this, was the editor in focus, out of focus, or minimized when the computer went to sleep?
Did you put the PC into sleep manually or did it just time out and go to sleep by itself?
Does this happen even with a blank project?
Have you had any issues of this happening with other engine versions?
Are you using a source build or one downloaded from the Epic Games Launcher?
You mentioned that you have had it happen “few times”. Does it happen every time you let the computer go to sleep while the editor is open or only some of the time. If it’s not 100%, how frequent would you say it is on a scale of 1 to 10?
Could you provide a log file from one of the times where this occurred? They can be found in the project directory under ProjectName/Saved/Logs/ProjectName.txt

I’ve set up one of our extra PCs to have a project open and put it to sleep manually on a Windows 10 PC to see if I can get this to occur, as it could be OS specific, since most of us here still work on Windows 7.

Edit: Also, could you screenshot your power settings in Windows? The particular settings could be related to this as well.

Firefly74 · November 11, 2016, 11:09pm

Hi Matthew !

i would say not in focus ( nor minimized)
automatic sleep, just checked power settings, 30min for screen of, 1h for sleep ( if you need advanced one i will screen, but never touched them )
didn’t try, i will give it a shot next time ( even if our project is quite empty for now )
quite new here, started with .13, but as i did mostly editor pluggin development to see how i could port our tools, i might have not noticed before ( no hot reload for pluggins )
Though Launcher
it did happened often last 3/4 days ( day goes like this : work -lunch-work - sport - work , so 2 time a day pc go to sleep), won’t say 100% i don’t recall what was the state of editor at that time
i will try to get one the next time !

I don’t recall exactly, but i might have 2 editors running with different projects, and only one of these freeze

I will give you more info next time it happen !

Firefly74 · November 18, 2016, 11:51pm

Hi Matthew !
I didn’t had the same schedule this week so wasn’t able to get the same scenario, but forgot to close my editor tonight, and here we are !

Here is the Log

it’s looks fun ( really, last line is quite odd ), but that sounds more like an os related issue

Didn’t you had a chance to reproduce on your side ?

Have a good we !

anonymous_user_41845f4a · November 21, 2016, 3:10pm

I haven’t been able to get this to reproduce on my side so I’m thinking it’s related to the project or some type of setting. The odd thing about that log is the time stamps. It seems that the editor froze while printing that last line, although it hadn’t been inactive long enough to go to sleep if your setting is still 30 minutes. As it mentions a few lines up, you had been left clicking on something in the viewport just about 8 minutes earlier. Also, it seems that maybe the editor was in PIE when it was left out of focus? That could be related as well.

anonymous_user_41845f4a · December 8, 2016, 4:19pm

We haven’t heard from you in a while Firefly74. I’ve been trying to reproduce this periodically but haven’t had any luck. Have you continued having this issue? If so, do you have any of that other information? In the meantime, I’ll be marking this as resolved for tracking purposes.

Firefly74 · December 8, 2016, 6:29pm

Hey, didn’t had the bug last few weeks, i was doing more pluggin development back then, maybe that’s linked, maybe a windows updated fixed that somehow.
Yes, you can tag that as resolved !
if ever that thing come back i will comment here

Have a good day !