GetLuaTable != Table

[ghost]

Occasionally when joining any servers (vanilla included), Garry's Mod crashes displaying a dialog with the title "Engine error" and the contents of it being "GetLuaTable != Table". Happens shortly after clicking "connect". This issue persists with all addons disabled as well.

Screenshot: http://puu.sh/i7hNx/8af5645d85.png

[thegrb93]

Never seen this. Dev branch? OS?

[TheFreeman193]

I've seen this issue before, but a long time ago. IIRC, verifying your game cache generally fixed it.

[ghost]

Happened in dev branch and non-dev branch. Running Windows 8.1 Intel i7 Quad-Core, Sandy Bridge 8GB DDR3 AMD Radeon HD 6770M Series, 512mb

[robotboy655]

Have you tried the obvious - verifying the game? I have never seen this error before.

[ghost]

Yes, I have tried that.

[ghost]

It happens rarely, but it nonetheless happens on occasion.

[robotboy655]

Looking at the code, it is most likely that something on your server or client overrides Entity:GetTable() to be not a table. Go figure it out.

[ghost]

?? But I've encountered this crash on many different servers (as well as some vanilla local games). Some of these servers had addons, some didn't, but it happens with addons disabled. I have verified the game and reinstalled in the past.

[robotboy655]

I have NEVER had seen this error happen to me, or even saw it anywhere else until now. It is 90% that it is caused by custom Lua, as it always is with people reporting crazy issues. ( Including you AFAIK. No offense, but I am getting sick of it )

[KR4N1X]

Happens to about 20% of my players on TTT when I force map to the same current map. Is a shitty bug but not worth spending the time trying to find out why.

[ghost]

There you go, bug confirmed. So quick to dismiss.

[willox]

I had it happen to somebody connected to my extremely-vanilla Sandbox listen server yesterday. I don't think it's any specific addon if we're all getting the issue.

[mcd1992]

It happens to me almost every day on my dev server. Client & Server on same machine, Windows 7 64 and dev branch of gmod. It happens to me after using auto-refresh a lot (just changing files and letting them reload) and then doing a changelevel to the same map. It happens to only my windows client, the linux client can handle the changelevel just fine.

Before the crash the client has an error about setmetatable. I'll try to drop a Lua stacktrace and crash dump next time it happens here.

[robotboy655]

Crash dump is worthless for the most part. I know where it crashes. The problem is why does the Entity:GetTable() becomes not a table.

In dev branch, can you post the exact error message? I added "Type: " to it.

[mcd1992]

[mcd1992|3|STEAM_0:1:15542171] Lua Error:

[ERROR] stack overflow
  1. GetTable - [C]:-1
   2. __index - lua/includes/extensions/entity.lua:23
    3. __index - lua/includes/extensions/entity.lua:25
     4. __index - lua/includes/extensions/entity.lua:25
      5. __index - lua/includes/extensions/entity.lua:25
       6. __index - lua/includes/extensions/entity.lua:25
        7. __index - lua/includes/extensions/entity.lua:25
         8. __index - lua/includes/extensions/entity.lua:25
          9. __index - lua/includes/extensions/entity.lua:25
           10. __index - lua/includes/extensions/entity.lua:25
            11. __index - lua/includes/extensions/entity.lua:25
             12. __index - lua/includes/extensions/entity.lua:25
              13. __index - lua/includes/extensions/entity.lua:25
               14. __index - lua/includes/extensions/entity.lua:25
                15. __index - lua/includes/extensions/entity.lua:25
                 16. __index - lua/includes/extensions/entity.lua:25

Engine Error: GetLuaTable != TABLE! Type is: 3

Also after the client crashes once the issue goes away until more auto-refreshes.

[willox]

You you use the save system or duplicator at all?

[mcd1992]

Nope this was an empty server, never loaded a save or pasted a dupe.

[robotboy655]

Apparently the tables becomes a number? Let me know if the number changes to anything else.

[willox]

Anything (especially 3rd party modules) that change console variables installed?

[mcd1992]

No custom modules on server, client has the menustate lua viewer modules / code installed and that's all. This issue has happened prior to the installation of that though.

[ghost]

This does happen on vanilla servers with vanilla clients for me, and it seems it happens to others too. No custom modules, as both are vanilla.

[mcd1992]

@imp0se has it happened to you while using auto-refresh? As in have you edited lua files while the server is running? The triggers I seem to have it narrowed down to is using autorefresh and having the server up for a long time, then doing a changelevel.

[ghost]

I wouldn't know if it happens during autorefresh, but I know it does mostly happen to me after a changelevel/reconnect or just a reconnect.

[mcd1992]

How long would you say your / the server has been up for when it happens to clients. And does it only happen to you after you've played on the server for a while or has it happened when you first join a server?

[ghost]

When it happens can vary. Sometimes it happens on first join, sometimes it happens if I played on it for a while. The server could've been up for a while, but this happens on other servers too. Can't be sure, it's very random.

[mcd1992]

Hrm, well that at least tells me its not auto-refresh.

[mcd1992]

Just got a new engine error after a changelevel.

"Pushing stack pos that doesn't exist!"

No other info.

[robotboy655]

So, stack corruption?

I will have to check all new functions for any problems then.

[mcd1992]

If I had to guess. Still not sure where it could be happening though.

[mcd1992]

For future reference I'm not using the new NWVars anywhere and never using traceline's target table parameter. Which I believe were the two culprits last time for metatable corruption.

[robotboy655]

I wouldn't say you are not using NWVars, they are used quite often in vanilla.

[mcd1992]

Another new crash reason, "attempt to index a number value" https://dl.dropboxusercontent.com/u/6124906/Temp/hl2_150720_crash_2015_7_21T23_4_40C0.mdmp

Then another crash that had no Engine Error. https://dl.dropboxusercontent.com/u/6124906/Temp/hl2_150720_crash_2015_7_21T22_54_48C0.mdmp

Both of these occurred after a changelevel.

[DBotThePony]

Ha ha ha...

Lua error on shutdown/changemap will cause this

[ghost]

So is this now just a big changelevel crash report thing?

[Jcw87]

I would like to add my 2 cents to this. Occasionally, when auto-refresh loads one of my scripts, a for loop similar to the following would get a very odd error

for i = 1, count do
    local somevalue = sometable[i+othervalue]
    -- stuff
end

the error looks something like this:

attempt to perform arithmetic on 'i' (a table value)

So, I think auto-refresh is fucking with LuaJIT in a big way. I used to get weird errors in for loops that weren't provoked by auto-refresh, but gmod's LuaJIT was updated since then, and I think that stopped.

[P4sca1]

Any news on this? I recently got this issue while playing TTT.

[ghost]

Engine Error, Lua panic! Something went horribly wrong! "stack overflow"

This issue occurred on changelevel. Crash dump included: https://db.tt/fsVLjPtZ

[JetBoom]

https://github.com/garrynewman/garrysmod/blob/master/garrysmod/lua/includes/extensions/entity.lua#L25

Shouldn't it be pretty obvious why it's doing this? It's using tab[] which calls index. index doesn't stop being called just because you're already inside __index. It should be using rawget.