[Bug 60517] New: ZBrush 2025.1.2 crashes when using ZRemesher 4.0 on complex mesh

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60517

            Bug ID: 60517
           Summary: ZBrush 2025.1.2 crashes when using ZRemesher 4.0 on
                    complex mesh
           Product: Wine
           Version: 9.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---
      Distribution: ---

I am running ZBrush 2025.1.2 under Wine on Kubuntu 24.04 LTS (X11 session). The
application starts and runs, including pen pressure and basic sculpting.
However, when I use ZRemesher 4.0 on a complex mesh (high polygon count),
ZBrush either crashes unexpectedly or freezes the entire system. The same
operation works perfectly in ZBrush 2022 (which uses ZRemesher 3.0) under the
same Wine prefix and environment.

The issue appears to be a regression introduced with ZRemesher 4.0, which uses
massive multithreading. Wine seems unable to handle the synchronization of many
threads, leading to a race condition and subsequent crash/hang.

System information:
- Distribution: Kubuntu 24.04 LTS (X11)
- CPU: Intel Core i7-13700F
- GPU: NVIDIA GeForce RTX 4070 Ti
- NVIDIA Driver: 580.178.04 (or your current version)
- Wine version: wine-11.9 (or your current version)
- ZBrush version: 2025.1.2
- Wine prefix: /home/p/zbrush_2026 (adjust if needed)

Steps to reproduce:
1. Start ZBrush 2025.1.2 with Wine.
2. Load a high-polygon mesh (e.g., more than 1 million polygons).
3. Go to Geometry > ZRemesher.
4. Click the ZRemesher button to start the remeshing process.
5. The progress bar advances, but at some point (often near completion or when
finishing), ZBrush crashes or the whole system freezes.

Additional information:
- ZBrush 2022 (ZRemesher 3.0) works flawlessly in the same environment.
- The crash/freeze does not occur with simple or low-poly meshes, but is very
frequent with complex, high-poly meshes.
- I have tried limiting CPU cores via WINE_CPU_TOPOLOGY and disabling
Esync/Fsync, but the problem persists.
- The issue seems to be related to thread synchronization in Wine when
ZRemesher 4.0 spawns many threads.

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