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Good idea.  I had search for the error code but not the phrase, as I didn't realise it was a Unity-specific phrase.

Searching for the phrase led me to this post: https://gamedev.stackexchange.com/questions/110613/my-game-crashed-access-violation-0xc0000005

The post explains how to read the crash log, so I'm now relatively sure the issue is a stack overflow caused by interaction between RimWorld and some DLL.

I've attempted to repair DirectX (to the extent that you can nowadays, since DX12 is baked into Windows 10).  If that doesn't work I'll attempt a system repair, and if that doesn't work I'll just blow the OS away and reinstall.

Thanks for your efforts, Canute, I appreciate it.

I just Windows Defender at the moment.  I've now added as exceptions to Windows Defender:

• the Rimworld folder in steamapps
• the Rimworld folder in AppData
• the Rimworld process (RimWorldWin64.exe)

I'll let you know how I get on.  I've never seen antivirus cause a process not to be able to address its own memory though.  Access Violation is a segfault: when the process attempts to address memory outside of its allowed memory area.

No dice.  Crashed after 1 hour 20 minutes with the newer, never-modded save, which currently looks like this: https://www.dropbox.com/s/e4qg7zgostx36a7/Commonwealth%20of%20Freetopia%20%28Permadeath%29.rws?dl=1

Same error message (Write to location 00000aac caused an access violation.)

Attached:
2019-12-30_224202.zip - Different colony (never modded). Crash during gameplay, 1hr20mins after loading.

You still have these error's

Could not do PostLoadInit on RimWorld.Pawn_RelationsTracker: System.NullReferenceException: Object reference not set to an instance of an object
  at RimWorld.Pawn_RelationsTracker.ExposeData () [0x00000] in <filename unknown>:0
  at Verse.PostLoadIniter.DoAllPostLoadInits () [0x00000] in <filename unknown>:0

It is a new colony or the one you removed the mod ?

That's from the same game; the one where I had removed a mod.

P.S. You don't need to report any crash, until there is something different.
I think basicly the crash can happen anything, after enough error's happen.

Okay.  I don't see any correlation between the crashes and the error messages though.  For example attached to this message is another crash that I just experienced, in another savegame from a fresh colony, which hasn't any errors (I was playing with the debug log visible to check).

(Attached: 2019-12-30_220428.zip - Different colony (never modded). Crash while expanding a zone.)

Link to that savegame: https://www.dropbox.com/s/zuznbrb4qp7f23p/Teba%20%28Permadeath%29.rws?dl=1

There shouldn't be any error's, specialy when you just play without mods.
Game installation should be fine too.

Could you try out to start Rimworld direct from the installation folder and not over Steam ?
Some people report some issues that Rimworld got just ended (without crash) when the start it over steam.

I'll give it a shot.  Cheers.

Attached:
2019-12-30_215028.zip - Crash while moving a new machining bill up through the list of bills.

No improvement from having deleted the RimWorld folder and let Steam rebuild it. Crashed less than a minute after load, in general play.

Attached:
2019-12-30_213248.zip - Crash in general, not sure what I did immediately before it crashed.

Those error messages in red don't appear when I load the colony I made to test whether I get crashes in a fresh colony, so they might be related to me having removed that mod and unrelated to the crashes.

Should an important information you just post now ?
Removing mod's from a safegame are a bad idea.
Only a few mod's can be removed safty. That explain all the relation error's you got all the time.

I mentioned it much earlier, in reply to your first post.  I have also said that the same crashes occur in fresh colonies, which don't have the relation errors, so the relation errors are not causing the crashes.

And you didn't needed to post these error's as screenshots, they are all documented at the output_log.txt you posted allready (inside the crash zip's).

Great.

Those error messages in red don't appear when I load the colony I made to test whether I get crashes in a fresh colony, so they might be related to me having removed that mod and unrelated to the crashes.

Oh damn let me trim those down a sec =/

Just try out one last thing.
Delete the complete rimworld installation folder in your case it should be
C:\Program Files (x86)\Steam\steamapps\common\RimWorld
I don't trust the steam verify process.
Then let steam repair/reinstall Rimworld.

Okay, done that.  I'll see how I get on later.

You can enable the developer mode at the options. So you should have access to the log window ingame (Icon top left).
When some red lines appear (errors) something is wrong.

Had a quick check and got the following errors, which appear to be about pawn job selection/prioritisation.

Attached:
2019-12-30_003620.zip - Crash while clicking to confirm new research choice.

I had left this one in the background for a little less than an hour, paused, to see if it would crash even while nothing was going on. I played with the UI to see if I could generate a crash, but nothing happened.  I started playing and was able to play for almost an hour without any of the previous suspects crashing the game (no trader to test with though).  Then my research completed and I selected Medicine Production and the game crashed when I clicked to confirm the new research choice.

Attached:
2019-12-30_002942.zip - Loaded, clicked a helper entry in the top-right, immediate crash.

Attached:
2019-12-29_231412.zip - Crash while running in background.

I loaded the game and left it running in the background for around 30~40 minutes.  Came back and I couldn't get it to crash at all.  Tabbed out again and left it running and it crashed about 10 minutes later for a total of 50 minutes after having been started.

Attached:
2019-12-29_222720.zip - Crash while simply panning around my base.

I have edge-scrolling disabled and I pan by clicking and dragging with the middle mouse button.

Hi,
at last i can tell you it has nothing to do with your mashine or your Rimworld installation.
I get the same error's with your safegame.
And since you don't use any mods, this is very unusual.

I think a Dev need to take a look into your safegame and why these error's happen. Because these error's lead to the crash soon or later.

I suggest to start a new colony at first.

Thanks for having a look.  I get the same problem with a new colony.

Regarding mods, I began this colony to check out RJW, but it turned out to really not be my cup of tea, so I removed it.  I had the problem both while RJW was active and after it was removed, and new colonies started since removing the mod have the same problem.