Dawn of War Soulstorm (9450) "Out of Sync error" while playing online game

[itaranto]

Compatibility Report

• Name of the game with compatibility issues: Dawn of War Soulstorm
• Steam AppID of the game: 9450

System Information

• GPU: RX 570
• Driver/LLVM version: Mesa 19.3.2
• Kernel version: 5.4.13-1-default
• Link to full system information report as [Gist]:
  https://gist.github.com/itaranto/591d8dc99a767fb1f6e9e2d9d13b28f8
• Proton version: 4.11-12 (also tested with 4.2-9 and 3.16-9)

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Symptoms

"Out of Sync error" while playing online game

Reproduction

Play an on online game for about 15-30 minutes.

Notes:

I did not use any mods and I did a clean reinstall of the game.

[itaranto]

I tested Proton 3.7-8. I haven't got any "Out of Sync error" with this version but I did have some crashes and hangs when playing online.
I experienced fewer crashes when using PROTON_FORCE_LARGE_ADDRESS_AWARE=1.
So far this configuration is the most stable for playing online.

[BezPowell]

I tested Proton 3.7-8. I haven't got any "Out of Sync error" with this version but I did have some crashes and hangs when playing online. I experienced fewer crashes when using PROTON_FORCE_LARGE_ADDRESS_AWARE=1. So far this configuration is the most stable for playing online.

After playing multi-player with no stability issues for years, I suddenly started getting 'Out of Sync' errors on every match a couple of months ago. I tried your suggestions and it has been perfectly stable for the last 8 or 9 multi-player games I've played. Thank you!

[metinc]

I was able to play without sync errors by using the COH2 fix. All I did was replacing the ucrtbase.dll as described here: https://gist.github.com/jrbergen/0ce746676c4fbcc2becd6054d1bba2ed

[pnguyen9]

I was able to play without sync errors by using the COH2 fix. All I did was replacing the ucrtbase.dll as described here: https://gist.github.com/jrbergen/0ce746676c4fbcc2becd6054d1bba2ed

I tried doing that same fix. It's somewhat more stable, but eventually I get a game during which it happens anyway.

[PHLF]

I confirm @pnguyen9 observations, the multiplayer game is more stable after the aforementioned manual dll copy/pasting but still end up desyncing.
Many games are concerned by this desync issue:

• Company of Heroes 3 (1677280) #6568
• Halo: The Master Chief Collection (976730) #2907
• Age of Empires II: Definitive Edition (813780) #3189

The main cause of the problem is, apparently, well known:
https://www.codeweavers.com/blog/rbernon/2022/9/12/ucrtcringedll-reverse-engineering-ucrtbasedll-for-pain-and-non-profit

[pnguyen9]

@PHLF I've had the same desync issue while playing Dawn of War II and its expansions (Chaos Rising, Retribution) in the past, but it seems to be so much more stable by applying these two fixes:

• Download and use Proton 6.1 GE-2 (greatly improved stability but still had it happen once in the past).
• The aforementioned COH2 fix.

So far, I haven't had another desync (yet), but I haven't tried with the other games, so I don't know whether or not it would also help.