Tatsunoko vs. Capcom freezes in DEMO screen /Training/Arcade with JIT

[strider973]

Summary

I am testing Tatsunoko vs. Capcom: Ultimate All-Stars (USA, STKE08) with ModernGekko/RecompCore on Windows.

The game runs at around 60 FPS with the JIT and most gameplay is functional, but it still freezes in several repeatable or intermittent situations.

Freeze behavior

• Demo / Attract Mode: reproducible freeze at roughly the same point after a cold launch.
• Training Mode: intermittent freezes.
• Arcade Mode: can freeze during character selection or during transitions.
• When the freeze happens, the image remains stuck rather than the process immediately exiting.

Working parts

• Audio works.
• GameCube controller configuration works through GCPadNew.ini.
• Arcade stick works through SDL as SDL/0/Xbox One Controller.
• Shader cache works.
• Waiting for shader compilation before startup works.
• Software volume control works.

Typical runtime options:

--allow-interpreter
--graphics D3D
--audio "WASAPI (Exclusive Mode)"

[strider973]

Version / fork context
ModernGekko base commit: 2c177b3
Current fork branch: tvc-work-2c177b3
Current fork repository: strider973/ModernGekko-TvC
Tests already performed
Enabled shader cache.
Enabled WaitForShadersBeforeStarting by default.
Tested with the existing shader UID cache and with shaders being rebuilt.
Verified controller and audio configuration.
Tested the newer LL/SC reservation invalidation change from GXRuntime/include/core/cpu.h (clear_matching_reservation called by mem_write64/32/16/8).
The patched runtime built successfully.
The game still froze.
Restoring the previous runtime binary restored the previous working behavior, so the LL/SC patch alone does not resolve this issue.
The newer MinGW thread-affinity fix appears unlikely to apply to the current working build, which uses MSVC x64.
Suspected areas

The issue currently looks more runtime-related than graphics, shader compilation, audio, or input related. Possible areas include:

fallback JIT behavior
native dispatch
interpreter/JIT transitions
code invalidation
exceptions
CoreTiming / CPU synchronization
DSP or audio thread synchronization
Request

Have you seen a similar freeze pattern with Wii titles under ModernGekko/RecompCore?

Any guidance on which subsystem to instrument next would be very helpful. I can provide:

exact freeze points
logs
commit SHAs
a minimal reproduction procedure
additional runtime diagnostics