Stack Overflow in Wine Flatpak (WoW64) on AlmaLinux 9 when Running 64-bit Installer

Support
1

Hello,

I’m attempting to run a 64-bit Windows installer using the Flatpak version of Wine (org.winehq.Wine) on AlmaLinux 9.

Despite granting full file system access via Flatseal (including $HOME and all system files), the installer crashes immediately on launch with a stack overflow error. The terminal shows:

err:virtual:map_image_into_view failed to set 60000020 protection on C:\\windows\\system32\\ntdll.dll
err:virtual:virtual_setup_exception stack overflow

I’ve tested multiple Flatpak versions of Wine (wow64-24.08, etc.), freshly initialized the Wine prefix, and even launched Wine via --command=bash to ensure environment control. The failure persists.

This same installer works under native Wine on non-Flatpak-based systems. It seems the Flatpak sandbox is preventing the memory protections required to load ntdll.dll properly under WoW64.

Questions:

  1. Is there a known workaround to allow Flatpak Wine to run 64-bit installers requiring executable memory mapping for system DLLs?
  2. Is this a known Flatpak sandbox limitation, or can the issue be resolved via overrides or manifest adjustments?

Thank you in advance for your help. In version 8 it runs without any problems.

Best regards,
Juergen

2

Hi,

This sounds very similar to what some users of OpenSUSE MicroOS reported - that any Flatpake’d Wine version throws these exact 2 errors.

They did try non Flatpak Wine (though via distrobox since MicroOS is an immutable distro) and those ran fine.

I suspect the issue here is not Flatpak sandbox preventing Wine to run properly, but SELinux enforcing mode - since both MicroOS and AlmaLinux have this mode enabled by default.

Before running org.winehq.Wine Flatpak, type “sudo setsebool selinuxuser_execmod 1” and then try running that installer afterwards.
If that fixed the issue, you can then type “sudo setsebool -P selinuxuser_execmod 1” to make it permanent.

(Btw, you don’t need to change org.winehq.Wine permissions, as the Flatpak already has all the proper permissions needed for Wine to function properly).

3

Thanks for answer. Its fixed with an update so it running fine now. Thanks for investigations!