[GH-ISSUE #63] Access violation reading 0x00000000000000E0 - RX 9070 XT (gfx120X|RDNA4) ROCm 7.13 on Windows #19

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opened 2026-10-26 22:23:40 +00:00 by bsakaguchi · 1 comment

bsakaguchi commented

2026-10-26 22:23:40 +00:00

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Originally created by @tomsnunes on GitHub (Jun 15, 2026).
Original GitHub issue: https://github.com/Comfy-Org/comfy-aimdo/issues/63

Hello everyone,

I noticied some instability problems when using Dynamic VRAM on ComfyUI. Sometimes everything works fine, but most of time, even a rerun of a workflow causes the following error.

Environment
Python: 3.12.10 (tags/v3.12.10:0cc8128, Apr 8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)]
ComfyUI: 0.24.0
rocmIndex: gfx120X-all

Packages:
rocmIndexUrl https://rocm.nightlies.amd.com/v2/gfx120X-all/
torchvision 0.27.0a0+rocm7.13.0a20260416
torch 2.13.0a0+rocm7.13.0a20260416
torchaudio 2.11.0+rocm7.13.0a20260416
comfy-aimdo 0.4.9
comfy-kitchen 0.2.10

[INFO] got prompt
[INFO] model weight dtype torch.float16, manual cast: None
[INFO] model_type EPS
[INFO] Using split attention in VAE
[INFO] Using split attention in VAE
[INFO] VAE load device: cuda:0, offload device: cpu, dtype: torch.bfloat16
[INFO] CLIP/text encoder model load device: cuda:0, offload device: cpu, current: cpu, dtype: torch.float16
[INFO] Requested to load SDXLClipModel
[INFO] Model SDXLClipModel prepared for dynamic VRAM loading. 1560MB Staged. 0 patches attached. Force pre-loaded 180 weights: 800 KB.
Windows fatal exception: access violation

Stack (most recent call first):
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\comfy_aimdo\vram_buffer.py", line 32 in __init__
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\model_management.py", line 1346 in get_aimdo_cast_buffer
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 123 in get_cast_buffer
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 164 in cast_modules_with_vbar
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 321 in cast_bias_weight
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 752 in forward_comfy_cast_weights
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 761 in forward
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789 in _call_impl
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778 in _wrapped_call_impl
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 213 in process_tokens
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 266 in forward
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789 in _call_impl
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778 in _wrapped_call_impl
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 306 in encode
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 45 in encode_token_weights
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sdxl_clip.py", line 59 in encode_token_weights
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 395 in encode_from_tokens
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 326 in encode_from_tokens_scheduled
  File "C:\Platform\ai\comfyui\instances\rocm-preview\nodes.py", line 79 in encode
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 303 in process_inputs
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 315 in _async_map_node_over_list
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 341 in get_output_data
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 542 in execute
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 784 in execute_async
  File "asyncio\events.py", line 88 in _run
  File "asyncio\base_events.py", line 1999 in _run_once
  File "asyncio\base_events.py", line 645 in run_forever
  File "asyncio\windows_events.py", line 322 in run_forever
  File "asyncio\base_events.py", line 678 in run_until_complete
  File "asyncio\runners.py", line 118 in run
  File "asyncio\runners.py", line 195 in run
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 724 in execute
  File "C:\Platform\ai\comfyui\instances\rocm-preview\main.py", line 340 in prompt_worker
  File "threading.py", line 1012 in run
  File "threading.py", line 1075 in _bootstrap_inner
  File "threading.py", line 1032 in _bootstrap
[ERROR] !!! Exception during processing !!! exception: access violation reading 0x00000000000000E0
[ERROR] Traceback (most recent call last):
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 542, 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 "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 341, 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 "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 315, in _async_map_node_over_list
    await process_inputs(input_dict, i)
  File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 303, in process_inputs
    result = f(**inputs)
             ^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\nodes.py", line 79, in encode
    return (clip.encode_from_tokens_scheduled(tokens), )
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 326, in encode_from_tokens_scheduled
    pooled_dict = self.encode_from_tokens(tokens, return_pooled=return_pooled, return_dict=True)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 395, in encode_from_tokens
    o = self.cond_stage_model.encode_token_weights(tokens)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sdxl_clip.py", line 59, in encode_token_weights
    g_out, g_pooled = self.clip_g.encode_token_weights(token_weight_pairs_g)
                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 45, in encode_token_weights
    o = self.encode(to_encode)
        ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 306, in encode
    return self(tokens)
           ^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789, in _call_impl
    return forward_call(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 266, in forward
    embeds, attention_mask, num_tokens, embeds_info = self.process_tokens(tokens, device)
                                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 213, in process_tokens
    tokens_embed = self.transformer.get_input_embeddings()(tokens_embed, out_dtype=torch.float32)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778, in _wrapped_call_impl
    return self._call_impl(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789, in _call_impl
    return forward_call(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 761, in forward
    return self.forward_comfy_cast_weights(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 752, in forward_comfy_cast_weights
    weight, bias, offload_stream = cast_bias_weight(self, device=input.device, dtype=out_dtype, offloadable=True)
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 321, in cast_bias_weight
    offload_stream = cast_modules_with_vbar([s], dtype, device, bias_dtype, non_blocking)
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 164, in cast_modules_with_vbar
    xfer_dest = get_cast_buffer(dest_size)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 123, in get_cast_buffer
    cast_buffer = comfy.model_management.get_aimdo_cast_buffer(offload_stream, device)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\model_management.py", line 1346, in get_aimdo_cast_buffer
    cast_buffer = comfy_aimdo.vram_buffer.VRAMBuffer(DEFAULT_AIMDO_CAST_BUFFER_RESERVATION_SIZE, device.index)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\comfy_aimdo\vram_buffer.py", line 32, in __init__
    self._ptr = lib.vrambuf_create(self.device, self.max_size)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
OSError: exception: access violation reading 0x00000000000000E0

[INFO] Prompt executed in 0.83 seconds

I've tried different combinations of parameters and models, and problem persists until I completely disable Dynamic VRAM, and as the --disable-dynamic-vram is announced to be removed in the future, I want to provide some information.

Thank you!

Complete log: comfyui_dynamic_vram_rocm_windows.txt

Originally created by @tomsnunes on GitHub (Jun 15, 2026). Original GitHub issue: https://github.com/Comfy-Org/comfy-aimdo/issues/63 Hello everyone, I noticied some instability problems when using Dynamic VRAM on ComfyUI. Sometimes everything works fine, but most of time, even a rerun of a workflow causes the following error. Environment Python: 3.12.10 (tags/v3.12.10:0cc8128, Apr 8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)] ComfyUI: 0.24.0 rocmIndex: gfx120X-all Packages: rocmIndexUrl https://rocm.nightlies.amd.com/v2/gfx120X-all/ torchvision 0.27.0a0+rocm7.13.0a20260416 torch 2.13.0a0+rocm7.13.0a20260416 torchaudio 2.11.0+rocm7.13.0a20260416 comfy-aimdo 0.4.9 comfy-kitchen 0.2.10 ``` [INFO] got prompt [INFO] model weight dtype torch.float16, manual cast: None [INFO] model_type EPS [INFO] Using split attention in VAE [INFO] Using split attention in VAE [INFO] VAE load device: cuda:0, offload device: cpu, dtype: torch.bfloat16 [INFO] CLIP/text encoder model load device: cuda:0, offload device: cpu, current: cpu, dtype: torch.float16 [INFO] Requested to load SDXLClipModel [INFO] Model SDXLClipModel prepared for dynamic VRAM loading. 1560MB Staged. 0 patches attached. Force pre-loaded 180 weights: 800 KB. Windows fatal exception: access violation Stack (most recent call first): File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\comfy_aimdo\vram_buffer.py", line 32 in __init__ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\model_management.py", line 1346 in get_aimdo_cast_buffer File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 123 in get_cast_buffer File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 164 in cast_modules_with_vbar File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 321 in cast_bias_weight File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 752 in forward_comfy_cast_weights File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 761 in forward File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789 in _call_impl File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778 in _wrapped_call_impl File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 213 in process_tokens File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 266 in forward File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789 in _call_impl File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778 in _wrapped_call_impl File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 306 in encode File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 45 in encode_token_weights File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sdxl_clip.py", line 59 in encode_token_weights File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 395 in encode_from_tokens File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 326 in encode_from_tokens_scheduled File "C:\Platform\ai\comfyui\instances\rocm-preview\nodes.py", line 79 in encode File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 303 in process_inputs File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 315 in _async_map_node_over_list File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 341 in get_output_data File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 542 in execute File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 784 in execute_async File "asyncio\events.py", line 88 in _run File "asyncio\base_events.py", line 1999 in _run_once File "asyncio\base_events.py", line 645 in run_forever File "asyncio\windows_events.py", line 322 in run_forever File "asyncio\base_events.py", line 678 in run_until_complete File "asyncio\runners.py", line 118 in run File "asyncio\runners.py", line 195 in run File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 724 in execute File "C:\Platform\ai\comfyui\instances\rocm-preview\main.py", line 340 in prompt_worker File "threading.py", line 1012 in run File "threading.py", line 1075 in _bootstrap_inner File "threading.py", line 1032 in _bootstrap [ERROR] !!! Exception during processing !!! exception: access violation reading 0x00000000000000E0 [ERROR] Traceback (most recent call last): File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 542, 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 "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 341, 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 "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 315, in _async_map_node_over_list await process_inputs(input_dict, i) File "C:\Platform\ai\comfyui\instances\rocm-preview\execution.py", line 303, in process_inputs result = f(**inputs) ^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\nodes.py", line 79, in encode return (clip.encode_from_tokens_scheduled(tokens), ) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 326, in encode_from_tokens_scheduled pooled_dict = self.encode_from_tokens(tokens, return_pooled=return_pooled, return_dict=True) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd.py", line 395, in encode_from_tokens o = self.cond_stage_model.encode_token_weights(tokens) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sdxl_clip.py", line 59, in encode_token_weights g_out, g_pooled = self.clip_g.encode_token_weights(token_weight_pairs_g) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 45, in encode_token_weights o = self.encode(to_encode) ^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 306, in encode return self(tokens) ^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778, in _wrapped_call_impl return self._call_impl(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789, in _call_impl return forward_call(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 266, in forward embeds, attention_mask, num_tokens, embeds_info = self.process_tokens(tokens, device) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\sd1_clip.py", line 213, in process_tokens tokens_embed = self.transformer.get_input_embeddings()(tokens_embed, out_dtype=torch.float32) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1778, in _wrapped_call_impl return self._call_impl(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\torch\nn\modules\module.py", line 1789, in _call_impl return forward_call(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 761, in forward return self.forward_comfy_cast_weights(*args, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 752, in forward_comfy_cast_weights weight, bias, offload_stream = cast_bias_weight(self, device=input.device, dtype=out_dtype, offloadable=True) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 321, in cast_bias_weight offload_stream = cast_modules_with_vbar([s], dtype, device, bias_dtype, non_blocking) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 164, in cast_modules_with_vbar xfer_dest = get_cast_buffer(dest_size) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\ops.py", line 123, in get_cast_buffer cast_buffer = comfy.model_management.get_aimdo_cast_buffer(offload_stream, device) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\instances\rocm-preview\comfy\model_management.py", line 1346, in get_aimdo_cast_buffer cast_buffer = comfy_aimdo.vram_buffer.VRAMBuffer(DEFAULT_AIMDO_CAST_BUFFER_RESERVATION_SIZE, device.index) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Platform\ai\comfyui\environments\rocm-preview-py312\Lib\site-packages\comfy_aimdo\vram_buffer.py", line 32, in __init__ self._ptr = lib.vrambuf_create(self.device, self.max_size) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ OSError: exception: access violation reading 0x00000000000000E0 [INFO] Prompt executed in 0.83 seconds ``` I've tried different combinations of parameters and models, and problem persists until I completely disable Dynamic VRAM, and as the --disable-dynamic-vram is announced to be removed in the future, I want to provide some information. Thank you! Complete log: [comfyui_dynamic_vram_rocm_windows.txt](https://github.com/user-attachments/files/28959783/comfyui_dynamic_vram_rocm_windows.txt)

bsakaguchi commented

2026-10-26 22:23:41 +00:00

Author

Owner

@Apophis3158 commented on GitHub (Jun 15, 2026):

This might be a ROCm Windows internal issue with it's closed source PAL: https://github.com/ROCm/rocm-systems/issues/6191#issuecomment-4499937988.

Please try this patch before AMD find the root cause:

--- a/comfy/model_management.py
+++ b/comfy/model_management.py
@@ -1375,7 +1375,7 @@ def reset_cast_buffers():
             model.model.dynamic_pins[model.load_device]["patches"] = (comfy_aimdo.host_buffer.HostBuffer(0, 8 * 1024 * 1024, pinned_hostbuf_size(model.model_size())), [], [-1], [0], [0], {})

     STREAM_CAST_BUFFERS.clear()
-    STREAM_AIMDO_CAST_BUFFERS.clear()
+    # STREAM_AIMDO_CAST_BUFFERS.clear()
     soft_empty_cache()

 def get_offload_stream(device):

@Apophis3158 commented on GitHub (Jun 15, 2026): This might be a ROCm Windows internal issue with it's closed source PAL: https://github.com/ROCm/rocm-systems/issues/6191#issuecomment-4499937988. Please try this patch before AMD find the root cause: ``` --- a/comfy/model_management.py +++ b/comfy/model_management.py @@ -1375,7 +1375,7 @@ def reset_cast_buffers(): model.model.dynamic_pins[model.load_device]["patches"] = (comfy_aimdo.host_buffer.HostBuffer(0, 8 * 1024 * 1024, pinned_hostbuf_size(model.model_size())), [], [-1], [0], [0], {}) STREAM_CAST_BUFFERS.clear() - STREAM_AIMDO_CAST_BUFFERS.clear() + # STREAM_AIMDO_CAST_BUFFERS.clear() soft_empty_cache() def get_offload_stream(device): ```

bsakaguchi referenced this issue

2026-10-26 22:24:15 +00:00

[PR #19] [CLOSED] linux: stop exporting cudaMalloc/cudaFree symbols #66