Major Wraith frequently locks up with black screen

[Recusor]

I was using the most up to date beta release as of Saturday Nov 16.

I had a mostly fun wraith round on Saturday that was marred by frequently locking up with a black screen forcing a byond restart. When loading back in my wraith character would spawn at 1,1 and I would have to move back to the station manually. It seemed to be caused while going through walls, but maybe not just that? I feel like it may have had to do with hiding and then showing tiles based on line of sight but I might be crazy.

This was the round I believe: http://goonhub.com/rounds/80516

[Studenterhue]

I had this happen to be once about two weeks or so ago. I'm pretty was I was still in 513.1496. I got the black screen only once though that wraith round though, and I got it after using Haunt to manifest somewhere.

[Drago156]

This sounds awfully familiar to this: https://forum.ss13.co/showthread.php?tid=11149

Not sure how related it is, but sounds like a problem from some kind of recent wraith fix.

[Urlance Woolsbane]

Can confirm. This happened to me twice in the last round I played, and once before then. I've no idea what causes it, but it is really quite annoying.

[FentonStraub]

this happened to me too, i had an admin tell me i was teleported out of the station somehow when i ahelped it, could be that

[Urlance Woolsbane]

this happened to me too, i had an admin tell me i was teleported out of the station somehow when i ahelped it, could be that

You were presumably teleported to 1, 1, 1, which is part of the bug.

[kyle2143]

It would be nice if there was an easily replicatable test case for this bug.
I've been doing some wraith things lately and have not encountered it on my own. I can say that it is very unlikely for it to be related to the wraith's blind bug.
The next time it occurs definitely ahelp or discord pm me and i can take a look at the logs to see what broke.

[Urlance Woolsbane]

I took a peak at code\mob\wraith.dm in the 2016 release, and it seems this sequence of code (lines 192-197) is culpable:

Code:

Move(var/turf/NewLoc, direct)
     if (loc)
          if (!isturf(loc) && !density)
              loc = get_turf(loc)
     else
          loc = locate(1,1,1)

What this doesn't explain is why the wraith's loc is getting set to null in the first place.

get_turf() is presumably responsible, though I don't know why, nor if the bug is even present in the 2016 release.