RuntimeError: quant_qk_per_thread_int8: Q/K base pointers and B/H/N strides must preserve 4-element alignment — MiniMax H3 + comfy kitchen attention backend on int8 checkpoints

[b4ldur]

Custom Node Testing

• I have tried disabling custom nodes and the issue persists (see how to disable custom nodes if you need help)

Expected Behavior

MiniMax H3 should sample normally with the comfy kitchen attention backend on an int8-convrot quantized checkpoint, or fail gracefully with a clear message if that combination isn't supported.

video_minimax_h3_t2v (3).json

Actual Behavior

Crashes immediately on step 0/20 with RuntimeError: quant_qk_per_thread_int8: Q/K base pointers and B/H/N strides must preserve 4-element alignment, thrown from comfy_kitchen's sage_sdpa_quantize kernel.

Steps to Reproduce

Load the standard MiniMax H3 T2V template workflow (attached).
Add a ModelAttentionBackend node between UNETLoader and the sampler chain, set attention = comfy kitchen attention.
Use an int8-convrot H3 checkpoint (minimax_h3_fl2va_pruned_int8_convrot.safetensors + qwen3vl_32b_minimax_h3_int8_convrot.safetensors).
Queue prompt.

Debug Logs

b4ldur@b4ldur-B650M-D3HP:~$ /home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/bin/python3 -s /home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/main.py --listen 127.0.0.1 --disable-all-custom-nodes
[INFO] setup plugin alembic.autogenerate.schemas
[INFO] setup plugin alembic.autogenerate.tables
[INFO] setup plugin alembic.autogenerate.types
[INFO] setup plugin alembic.autogenerate.constraints
[INFO] setup plugin alembic.autogenerate.defaults
[INFO] setup plugin alembic.autogenerate.comments
[INFO] Adding extra search path diffusion_models /media/b4ldur/Windows/Comfysage/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/models/diffusion_models
[INFO] Adding extra search path loras /media/b4ldur/Windows/Comfysage/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/models/loras
[INFO] Adding extra search path audio_encoders /media/b4ldur/Files1/models/audio_encoders
[INFO] Adding extra search path checkpoints /media/b4ldur/Files1/models/checkpoints
[INFO] Adding extra search path clip /media/b4ldur/Files1/models/clip
[INFO] Adding extra search path clip_vision /media/b4ldur/Files1/models/clip_vision
[INFO] Adding extra search path configs /media/b4ldur/Files1/models/configs
[INFO] Adding extra search path controlnet /media/b4ldur/Files1/models/controlnet
[INFO] Adding extra search path diffusers /media/b4ldur/Files1/models/diffusers
[INFO] Adding extra search path diffusion_models /media/b4ldur/Files1/models/diffusion_models
[INFO] Adding extra search path embeddings /media/b4ldur/Files1/models/embeddings
[INFO] Adding extra search path fishaudios2 /media/b4ldur/Files1/models/fishaudioS2
[INFO] Adding extra search path flashvsr-v1.1 /media/b4ldur/Files1/models/FlashVSR-v1.1
[INFO] Adding extra search path gguf /media/b4ldur/Files1/models/gguf
[INFO] Adding extra search path gligen /media/b4ldur/Files1/models/gligen
[INFO] Adding extra search path hypernetworks /media/b4ldur/Files1/models/hypernetworks
[INFO] Adding extra search path image-saver /media/b4ldur/Files1/models/image-saver
[INFO] Adding extra search path inpaint /media/b4ldur/Files1/models/inpaint
[INFO] Adding extra search path ipadapter /media/b4ldur/Files1/models/ipadapter
[INFO] Adding extra search path latent_upscale_models /media/b4ldur/Files1/models/latent_upscale_models
[INFO] Adding extra search path llm /media/b4ldur/Files1/models/LLM
[INFO] Adding extra search path mediapipe /media/b4ldur/Files1/models/mediapipe
[INFO] Adding extra search path model_patches /media/b4ldur/Files1/models/model_patches
[INFO] Adding extra search path models /media/b4ldur/Files1/models/models
[INFO] Adding extra search path onnx /media/b4ldur/Files1/models/onnx
[INFO] Adding extra search path photomaker /media/b4ldur/Files1/models/photomaker
[INFO] Adding extra search path pulid /media/b4ldur/Files1/models/pulid
[INFO] Adding extra search path qwen-tts /media/b4ldur/Files1/models/qwen-tts
[INFO] Adding extra search path rembg /media/b4ldur/Files1/models/rembg
[INFO] Adding extra search path rmbg /media/b4ldur/Files1/models/RMBG
[INFO] Adding extra search path sam3 /media/b4ldur/Files1/models/sam3
[INFO] Adding extra search path sams /media/b4ldur/Files1/models/sams
[INFO] Adding extra search path seedvr2 /media/b4ldur/Files1/models/SEEDVR2
[INFO] Adding extra search path sonic /media/b4ldur/Files1/models/sonic
[INFO] Adding extra search path style_models /media/b4ldur/Files1/models/style_models
[INFO] Adding extra search path text_encoders /media/b4ldur/Files1/models/text_encoders
[INFO] Adding extra search path ultralytics /media/b4ldur/Files1/models/ultralytics
[INFO] Adding extra search path unet /media/b4ldur/Files1/models/unet
[INFO] Adding extra search path upscale_models /media/b4ldur/Files1/models/upscale_models
[INFO] Adding extra search path vae /media/b4ldur/Files1/models/vae
[INFO] Adding extra search path vae_approx /media/b4ldur/Files1/models/vae_approx
[INFO] Adding extra search path vibevoice /media/b4ldur/Files1/models/vibevoice
[INFO] Adding extra search path vitmatte /media/b4ldur/Files1/models/vitmatte
[INFO] Adding extra search path wildcards /media/b4ldur/Files1/models/wildcards
[INFO] Adding extra search path yolo /media/b4ldur/Files1/models/yolo
/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/cuda/__init__.py:63: FutureWarning: The pynvml package is deprecated. Please install nvidia-ml-py instead. If you did not install pynvml directly, please report this to the maintainers of the package that installed pynvml for you.
  import pynvml  # type: ignore[import]
[INFO] Found comfy_kitchen backend triton: {'available': True, 'disabled': True, 'unavailable_reason': None, 'capabilities': ['adaln', 'apply_rope', 'apply_rope1', 'apply_rope1_', 'apply_rope_', 'apply_rope_split_half', 'apply_rope_split_half1', 'apply_rope_split_half1_', 'apply_rope_split_half_', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'int8_linear', 'na3d', 'quantize_and_rotate_rowwise', 'quantize_int8_rowwise', 'quantize_mxfp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'rms_adaln', 'rms_rope', 'rms_rope1', 'rms_rope1_', 'rms_rope_', 'rms_rope_split_half', 'rms_rope_split_half1', 'rms_rope_split_half1_', 'rms_rope_split_half_', 'w4a8_int8_linear']}
[INFO] Found comfy_kitchen backend eager: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['adaln', 'apply_rope', 'apply_rope1', 'apply_rope1_', 'apply_rope_', 'apply_rope_split_half', 'apply_rope_split_half1', 'apply_rope_split_half1_', 'apply_rope_split_half_', 'convrot_w4a4_linear', 'dequantize_convrot_w4a4_weight', 'dequantize_int8_convrot_weight', 'dequantize_int8_convrot_weight_dtype', 'dequantize_int8_embedding', 'dequantize_int8_simple', 'dequantize_int8_simple_dtype', 'dequantize_mxfp8', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'dequantize_w4a8_int8_weight', 'gemv_awq_w4a16', 'int8_linear', 'na3d', 'prepare_int4_weight_for_int8_linear', 'quantize_and_rotate_rowwise', 'quantize_convrot_w4a4_weight', 'quantize_int8_convrot_weight', 'quantize_int8_rowwise', 'quantize_int8_tensorwise', 'quantize_mxfp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'quantize_svdquant_w4a4', 'quantize_w4a8_int8_weight', 'rms_adaln', 'rms_rope', 'rms_rope1', 'rms_rope1_', 'rms_rope_', 'rms_rope_split_half', 'rms_rope_split_half1', 'rms_rope_split_half1_', 'rms_rope_split_half_', 'rotate_int8_convrot_weight', 'scaled_mm_mxfp8', 'scaled_mm_nvfp4', 'scaled_mm_svdquant_w4a4', 'stochastic_rounding_fp8', 'w4a8_int8_linear']}
[INFO] Found comfy_kitchen backend cuda: {'available': True, 'disabled': False, 'unavailable_reason': None, 'capabilities': ['adaln', 'apply_rope', 'apply_rope1', 'apply_rope1_', 'apply_rope_', 'apply_rope_split_half', 'apply_rope_split_half1', 'apply_rope_split_half1_', 'apply_rope_split_half_', 'convrot_w4a4_linear', 'dequantize_convrot_w4a4_weight', 'dequantize_int8_convrot_weight', 'dequantize_int8_convrot_weight_dtype', 'dequantize_int8_simple', 'dequantize_int8_simple_dtype', 'dequantize_nvfp4', 'dequantize_per_tensor_fp8', 'dequantize_w4a8_int8_weight', 'gemv_awq_w4a16', 'int8_linear', 'na3d', 'prepare_int4_weight_for_int8_linear', 'quantize_and_rotate_rowwise', 'quantize_convrot_w4a4_weight', 'quantize_int8_convrot_weight', 'quantize_int8_rowwise', 'quantize_int8_tensorwise', 'quantize_mxfp8', 'quantize_nvfp4', 'quantize_per_tensor_fp8', 'quantize_svdquant_w4a4', 'quantize_w4a8_int8_weight', 'rms_adaln', 'rms_rope', 'rms_rope1', 'rms_rope1_', 'rms_rope_', 'rms_rope_split_half', 'rms_rope_split_half1', 'rms_rope_split_half1_', 'rms_rope_split_half_', 'rotate_int8_convrot_weight', 'scaled_mm_nvfp4', 'scaled_mm_svdquant_w4a4', 'stochastic_rounding_fp8', 'w4a8_int8_linear']}
[INFO] Found comfy_kitchen backend hip: {'available': False, 'disabled': False, 'unavailable_reason': 'PyTorch ROCm/HIP runtime not available', 'capabilities': []}
[INFO] Checkpoint files will always be loaded safely.
[INFO] Total VRAM 15819 MB, total RAM 95656 MB
[INFO] pytorch version: 2.9.1+cu130
[INFO] Set vram state to: NORMAL_VRAM
[INFO] Device: cuda:0 NVIDIA GeForce RTX 5070 Ti : cudaMallocAsync
[INFO] Using async weight offloading with 2 streams
[INFO] Enabled pinned memory 81320
[INFO] working around nvidia conv3d memory bug.
[INFO] Using pytorch attention
[INFO] aimdo: /project/src/control.c:276:INFO:comfy-aimdo inited for GPU: NVIDIA GeForce RTX 5070 Ti (VRAM: 15819 MB)
[INFO] DynamicVRAM support detected and enabled
[INFO] Python version: 3.12.10 (main, Apr 16 2026, 18:09:14) [GCC 13.3.0]
[INFO] ComfyUI version: 0.32.0
[INFO] comfy-aimdo version: 0.4.13
[INFO] comfy-kitchen version: 0.2.30
[INFO] comfyui-frontend-package version: 1.48.7
[INFO] comfyui-workflow-templates version: 0.11.40
[INFO] comfyui-embedded-docs version: 0.5.9
[INFO] comfy-kitchen version: 0.2.30
[INFO] comfy-aimdo version: 0.4.13
[INFO] [Prompt Server] web root: /home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/comfyui_frontend_package/static
[INFO] Asset seeder disabled
[INFO] No OpenGL_accelerate module loaded: No module named 'OpenGL_accelerate'
[INFO] Skipping loading of custom nodes
[INFO] Context impl SQLiteImpl.
[INFO] Will assume non-transactional DDL.
[INFO] Using RAM pressure cache.
[INFO] Starting server

[INFO] To see the GUI go to: http://127.0.0.1:8188
[INFO] got prompt
[INFO] VAE load device: cuda:0, offload device: cpu, dtype: torch.float32
[INFO] VAE load device: cuda:0, offload device: cpu, dtype: torch.float16
[INFO] Found quantization metadata version 1
[INFO] Using MixedPrecisionOps for text encoder
[INFO] CLIP/text encoder model load device: cuda:0, offload device: cpu, current: cpu, dtype: torch.float16
[INFO] Requested to load MiniMaxH3TEModel_
[INFO] Model MiniMaxH3TEModel_ prepared for dynamic VRAM loading. 25882MB Staged. 0 patches attached. Force pre-loaded 310 weights: 1272 KB.
[INFO] Found quantization metadata version 1
[INFO] Detected mixed precision quantization
[INFO] Using mixed precision operations
[INFO] Native ops: int8_tensorwise, asym_w4a8_int8, convrot_w4a4, float8_e4m3fn, float8_e5m2, nvfp4 , emulated ops: mxfp8
[INFO] model weight dtype torch.bfloat16, manual cast: torch.bfloat16
[INFO] model_type FLOW_AV
[INFO] Requested to load MiniMaxH3
[INFO] 0 models unloaded.
[INFO] Model MiniMaxH3 prepared for dynamic VRAM loading. 19995MB Staged. 0 patches attached. Force pre-loaded 210 weights: 1175 KB.
  0%|                        | 0/20 [00:00<?, ?it/s,   Model Initializing ...  ]
[ERROR] !!! Exception during processing !!! quant_qk_per_thread_int8: Q/K base pointers and B/H/N strides must preserve 4-element alignment
[ERROR] Traceback (most recent call last):
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/execution.py", line 545, in execute
    output_data, output_ui, has_subgraph, has_pending_tasks = await get_output_data(prompt_id, unique_id, obj, input_data_all, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, v3_data=v3_data)
                                                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/execution.py", line 344, in get_output_data
    return_values = await _async_map_node_over_list(prompt_id, unique_id, obj, input_data_all, obj.FUNCTION, allow_interrupt=True, execution_block_cb=execution_block_cb, pre_execute_cb=pre_execute_cb, v3_data=v3_data)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/execution.py", line 318, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/execution.py", line 306, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy_api/internal/__init__.py", line 149, in wrapped_func
    return method(locked_class, **inputs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy_api/latest/_io.py", line 1990, in EXECUTE_NORMALIZED
    to_return = cls.execute(*args, **kwargs)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy_extras/nodes_custom_sampler.py", line 1055, in execute
    samples = guider.sample(noise.generate_noise(latent), latent_image, sampler, sigmas, denoise_mask=noise_mask, callback=callback, disable_pbar=disable_pbar, seed=noise.seed)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 1335, in sample
    output = executor.execute(noise, latent_image, sampler, sigmas, denoise_mask, callback, disable_pbar, seed, latent_shapes=latent_shapes)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/patcher_extension.py", line 113, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 1262, in outer_sample
    output = self.inner_sample(noise, latent_image, device, sampler, sigmas, denoise_mask, callback, disable_pbar, seed, latent_shapes=latent_shapes)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 1237, in inner_sample
    samples = executor.execute(self, sigmas, extra_args, callback, noise, latent_image, denoise_mask, disable_pbar)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/patcher_extension.py", line 113, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 1005, in sample
    samples = self.sampler_function(model_k, noise, sigmas, extra_args=extra_args, callback=k_callback, disable=disable_pbar, **self.extra_options)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/utils/_contextlib.py", line 120, in decorate_context
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/k_diffusion/sampling.py", line 1460, in sample_res_multistep
    return res_multistep(model, x, sigmas, extra_args=extra_args, callback=callback, disable=disable, s_noise=s_noise, noise_sampler=noise_sampler, eta=0., cfg_pp=False)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/utils/_contextlib.py", line 120, in decorate_context
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/k_diffusion/sampling.py", line 1418, in res_multistep
    denoised = model(x, sigmas[i] * s_in, **extra_args)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 640, in __call__
    out = self.inner_model(x, sigma, model_options=model_options, seed=seed)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 1208, in __call__
    return self.outer_predict_noise(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 1215, in outer_predict_noise
    ).execute(x, timestep, model_options, seed)
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/patcher_extension.py", line 113, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 1218, in predict_noise
    return sampling_function(self.inner_model, x, timestep, self.conds.get("negative", None), self.conds.get("positive", None), self.cfg, model_options=model_options, seed=seed)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 620, in sampling_function
    out = calc_cond_batch(model, conds, x, timestep, model_options)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 211, in calc_cond_batch
    return _calc_cond_batch_outer(model, conds, x_in, timestep, model_options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 219, in _calc_cond_batch_outer
    return executor.execute(model, conds, x_in, timestep, model_options)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/patcher_extension.py", line 113, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/samplers.py", line 335, in _calc_cond_batch
    output = model.apply_model(input_x, timestep_, **c).chunk(batch_chunks)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/model_base.py", line 203, in apply_model
    return comfy.patcher_extension.WrapperExecutor.new_class_executor(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/patcher_extension.py", line 113, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/model_base.py", line 247, in _apply_model
    model_output = self.diffusion_model(xc, t, context=context, control=control, transformer_options=transformer_options, **extra_conds)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/nn/modules/module.py", line 1775, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/nn/modules/module.py", line 1786, in _call_impl
    return forward_call(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/ldm/minimax/model.py", line 502, in forward
    out = comfy.patcher_extension.WrapperExecutor.new_class_executor(
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/patcher_extension.py", line 113, in execute
    return self.original(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/ldm/minimax/model.py", line 638, in _forward
    h = block(h, t_emb, mod_segments, rope_freqs, transformer_options=transformer_options)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/nn/modules/module.py", line 1775, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/nn/modules/module.py", line 1786, in _call_impl
    return forward_call(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/ldm/minimax/model.py", line 261, in forward
    x = _mod_gate(x, gate_msa, self.attn(h, rope_freqs=rope_freqs, transformer_options=transformer_options), mod_segments)
                               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/nn/modules/module.py", line 1775, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/torch/nn/modules/module.py", line 1786, in _call_impl
    return forward_call(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/ldm/minimax/model.py", line 172, in forward
    out = optimized_attention(q, k, v, self.heads, mask=None, skip_reshape=True, transformer_options=transformer_options)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/ldm/modules/attention.py", line 191, in wrapper
    return optimized_attention_override.container_function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/ComfyUI/comfy/ldm/modules/attention.py", line 628, in _attention_comfy_kitchen_int8_containers
    quantized = comfy_kitchen.prequantize_int8_attention(
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/b4ldur/ComfyUI-Easy-Install/ComfyUI-Easy-Install/python_embeded/lib/python3.12/site-packages/comfy_kitchen/sage_attention.py", line 322, in prequantize_int8_attention
    _cuda_backend._C.sage_sdpa_quantize(
RuntimeError: quant_qk_per_thread_int8: Q/K base pointers and B/H/N strides must preserve 4-element alignment

[INFO] Prompt executed in 24.59 seconds

Other

Likely related to #15263 — H3's attention call at comfy/ldm/minimax/model.py:172 doesn't pass low_precision_attention=False, unlike every other model using a low-precision-sensitive attention path in the tree. Suspect this is the same root cause surfacing through a different route (comfy_kitchen's int8 container instead of SageAttention). Workflow JSON attached.

video_minimax_h3_t2v (3).json

[coderabbitai]

⚠️ Possible Duplicate Issue(s)

• MiniMax H3 Comfy kitchen attention error: "quant_qk_per_thread_int8: Q/K base pointers and B/H/N strides must preserve 4-element alignment" #15494

🔗 Related PRs

#15270 - fix(minimax): expose H3 attention patch hooks [open]
#15467 - Harden some nodes against potential issues related to combos. [open]
#15479 - Implement comfy kitchen attention. [merged]
#15486 - Fix peak memory issue with H3. [merged]
#15518 - Fix comfy_kitchen int8 attention alignment error for MiniMax H3 [open]

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