[GH-ISSUE #3910] [GAME BUG]: THE IDOLM@STER STELLA STAGE - Assertion Failed in copy_shader.cpp #1174

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opened 2026-02-27 21:10:21 +03:00 by kerem · 0 comments

kerem commented

2026-02-27 21:10:21 +03:00

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Originally created by @NutSerina on GitHub (Jan 10, 2026).
Original GitHub issue: https://github.com/shadps4-emu/shadPS4/issues/3910

Checklist (we expect you to perform these steps before opening the issue)

I have searched for a similar issue in this repository and did not find one.
I am using an official build obtained from releases or updated one of those builds using its in-app updater.
I have re-dumped the game and performed a clean install without mods and the issue is still present.
I have disabled all patches and cheats and the issue is still present.
I have all the required system modules installed.

Describe the Bug

The game THE IDOLM@STER STELLA STAGE (CUSA09153) crashes after the main menu, specifically during the prologue sequence when the game attempts to render 3D character models.

The game boots successfully, plays the intro MP4, and reaches the title screen. After selecting "Produce", an MP4 cutscene plays correctly. Following the video, the dialogue UI appears, but as soon as the game attempts to render the 3D character model, the emulator crashes with an assertion failure in copy_shader.cpp.

Error Message:

[Debug] <Critical> (shadPS4:GpuComm) copy_shader.cpp:15 operator(): Assertion Failed!
First instruction is not s_mov_b32 vcc_hi, #imm

Reproduction Steps

Launch shadPS4 (Build f42a566 / v0.13.1 WIP). (Stable release 0.13.0 has the same problem)
Load THE IDOLM@STER STELLA STAGE (CUSA09153).

The game start like this

Select "Produce":
This is a mp4 video that can found in the game directory

First Dialog:

Crashed:

The emulator crashes immediately when the 3D character model is supposed to appear on screen.

By the way, in the game's S4U (stage for you) mode (when prepare for live) , it seems possible to load models, but there are significant issues with the textures. This image is a bit unsettling—I'm afraid it might cause discomfort, so I won't post it here for now. If needed, you can ask me for it.

My graphics card driver version is 535.274.02, which might be a long-term support version. See NVIDIA.

Regarding why the game is in Chinese:
This is the official Traditional Chinese version, not a third-party crack patch or cheat code.

Specify OS Version

Linux Mint 22.2

CPU

Intel(R) Core(TM) i7-14650HX

GPU

NVIDIA GeForce RTX 4060 Laptop GPU

Amount of RAM in GB

32 GB

Amount of VRAM in GB

8 GB

Log File

CUSA09153.log

Originally created by @NutSerina on GitHub (Jan 10, 2026). Original GitHub issue: https://github.com/shadps4-emu/shadPS4/issues/3910 ### Checklist (we expect you to perform these steps before opening the issue) - [x] I have searched for a similar issue in this repository and did not find one. - [x] I am using an official build obtained from [releases](https://github.com/shadps4-emu/shadPS4/releases) or updated one of those builds using its in-app updater. - [x] I have re-dumped the game and performed a clean install without mods and the issue is still present. - [x] I have disabled all patches and cheats and the issue is still present. - [x] I have all the required [system modules](https://github.com/shadps4-emu/shadPS4/wiki/I.-Quick-start-%5BUsers%5D#4-dumping-firmware-modules) installed. ### Describe the Bug The game THE IDOLM@STER STELLA STAGE (CUSA09153) crashes after the main menu, specifically during the prologue sequence when the game attempts to render 3D character models. The game boots successfully, plays the intro MP4, and reaches the title screen. After selecting "Produce", an MP4 cutscene plays correctly. Following the video, the dialogue UI appears, but as soon as the game attempts to render the 3D character model, the emulator crashes with an assertion failure in copy_shader.cpp. Error Message: ``` [Debug] <Critical> (shadPS4:GpuComm) copy_shader.cpp:15 operator(): Assertion Failed! First instruction is not s_mov_b32 vcc_hi, #imm ``` ### Reproduction Steps Launch shadPS4 (Build f42a566 / v0.13.1 WIP). (Stable release 0.13.0 has the same problem) Load THE IDOLM@STER STELLA STAGE (CUSA09153). The game start like this <img width="1969" height="1241" alt="Image" src="https://github.com/user-attachments/assets/76ad90b0-1cf7-480b-8e73-4e0a33369349" /> Select "Produce": This is a mp4 video that can found in the game directory <img width="1969" height="1241" alt="Image" src="https://github.com/user-attachments/assets/713c027b-d512-404d-bcdc-0358ad358209" /> First Dialog: <img width="1969" height="1241" alt="Image" src="https://github.com/user-attachments/assets/b94b47dd-0e70-4e64-b374-0dca7c59d845" /> Crashed: <img width="1969" height="1241" alt="Image" src="https://github.com/user-attachments/assets/c0b0d832-d64b-4ded-a5ab-982d8e550d5d" /> The emulator crashes immediately when the 3D character model is supposed to appear on screen. By the way, in the game's S4U (stage for you) mode (when prepare for live) , it seems possible to load models, but there are significant issues with the textures. This image is a bit unsettling—I'm afraid it might cause discomfort, so I won't post it here for now. If needed, you can ask me for it. My graphics card driver version is 535.274.02, which might be a long-term support version. See [NVIDIA](https://www.nvidia.com/en-us/drivers/details/217147/). Regarding why the game is in Chinese: This is the official Traditional Chinese version, not a third-party crack patch or cheat code. ### Specify OS Version Linux Mint 22.2 ### CPU Intel(R) Core(TM) i7-14650HX ### GPU NVIDIA GeForce RTX 4060 Laptop GPU ### Amount of RAM in GB 32 GB ### Amount of VRAM in GB 8 GB ### Log File [CUSA09153.log](https://github.com/user-attachments/files/24541577/CUSA09153.log)