Program is hanging forever on generation/Backends are still loading on the server...

[xmicro]

Expected Behavior

Able to generate images without the system just hanging.

Actual Behavior

After an update, when I launch SwarmUI and try to generate anything, it'll just sit at 1 current generation, 1 queued, 1 waiting on model load, ... forever. The message Backends are still loading on the server... message also sometimes hangs on the top forever, or it'll go away after a very long time. I tried a brand new install to a different folder and I get the same issue. Interestingly, when I try to rebuild it by deleting src/bin, I get the messages
`The system cannot find the path specified.

WARNING: You did a git pull without building. Will now build for you...

The system cannot find the path specified.
error: The source specified has already been added to the list of available package sources. Provide a unique source.
Restore complete (0.2s)
SwarmUI succeeded (0.4s) → src\bin\live_release\SwarmUI.dll`

However, it builds and then launches itself, but then has the hanging issue. It doesn't output any errors when it runs either (see below).

I tried running as admit and regular.

Steps to Reproduce

1. Fresh install SwarmUI
2. Run SwarmUI
3. try to generate

Debug Logs

01:56:32.893 [Init] === SwarmUI v0.9.7.1 Starting at 2025-10-25 01:56:32 ===
01:56:32.928 [Init] Prepping extension: SwarmUI.Builtin_ScorersExtension.ScorersExtension...
01:56:32.930 [Init] Prepping extension: SwarmUI.Builtin_ImageBatchToolExtension.ImageBatchToolExtension...
01:56:32.931 [Init] Prepping extension: SwarmUI.Builtin_GridGeneratorExtension.GridGeneratorExtension...
01:56:32.931 [Init] Prepping extension: SwarmUI.Builtin_DynamicThresholding.DynamicThresholdingExtension...
01:56:32.932 [Init] Prepping extension: SwarmUI.Builtin_ComfyUIBackend.ComfyUIBackendExtension...
01:56:32.933 [Init] Prepping extension: SwarmUI.Builtin_AutoWebUIExtension.AutoWebUIBackendExtension...
01:56:32.963 [Init] Parsing command line...
01:56:32.965 [Init] Loading settings file...
01:56:32.980 [Init] Re-saving settings file...
01:56:33.002 [Init] Applying command line settings...
01:56:33.019 [Init] SwarmUI was installed 2025-10-25 (0 days ago) with version 0.9.7.1
01:56:33.021 [Init] Swarm base path is: C:\Users\Jrwhe\Documents\swarm2\SwarmUI
01:56:33.021 [Init] Running on OS: Microsoft Windows 10.0.26100
01:56:33.049 [Init] Prepping options...
01:56:33.136 [Init] Current git commit is [4725a6c: patch autoscaler shutdown bug], marked as date 2025-10-24 19:53:03 (10 hours ago)
01:56:33.213 [Init] CPU Cores: 32 | RAM: 31.75 GiB total, 16.40 GiB available, 73.12 GiB total page file, 29.73 GiB available page file
01:56:33.214 [Init] GPU 0: NVIDIA GeForce RTX 4090 Laptop GPU | Temp 31C | Util 0% GPU, 0% Memory | VRAM 15.99 GiB total, 15.62 GiB free, 57.00 MiB used
01:56:33.215 [Init] Loading models list...
01:56:33.215 [Init] Will use GPU accelerations specific to NVIDIA GeForce RTX 40xx series and newer.
01:56:33.269 [Init] Loading backends...
01:56:33.270 [Init] Loading backends from file...
01:56:33.276 [Init] Initializing backend #0 - ComfyUI Self-Starting...
01:56:33.278 [Init] Prepping API...
01:56:33.282 [Init] Prepping webserver...
01:56:33.283 [Init] Backend request handler loop ready...
01:56:33.415 [Init] Scan for web extensions...
01:56:33.418 [Init] Readying extensions for launch...
01:56:33.419 [Init] Launching server...
01:56:33.421 [Init] Starting webserver on http://localhost:7801
01:56:33.703 [Init] Swarm is up to date! You have version 0.9.7.1, and 0.9.7-Beta is the latest.
01:56:33.704 [Init] SwarmUI v0.9.7.1 - Local is now running.
01:56:33.879 [Init] Self-Start ComfyUI-0 on port 7821 is loading...
01:56:34.218 [Init] Launch web browser...
01:56:35.359 [Info] Creating new session 'local' for ::1
01:59:44.111 [Init] Self-Start ComfyUI-0 on port 7821 started.

If I try to generate anything, I also get
[Info] User local requested 1 image with model 'chroma_v10HD.safetensors'...
and that's it, just hangs forever.

Other

No response

[mcmonkey4eva]

(1) do not run swarm as admin
(2) use the log pastebin button on the logs tab, and when viewing logs to decipher bugs, the Debug view is a lot more helpful than general info view
(3) Chroma is a particularly memory hungry model, watch task manager, it may just be overloading you. There are fp8 versions available (half the mem req), though the authors say fp8 is a bit unstable on chroma in particular.
(4) note we have a discord for general support https://discord.gg/q2y38cqjNw

[xmicro]

(1) do not run swarm as admin (2) use the log pastebin button on the logs tab, and when viewing logs to decipher bugs, the Debug view is a lot more helpful than general info view (3) Chroma is a particularly memory hungry model, watch task manager, it may just be overloading you. There are fp8 versions available (half the mem req), though the authors say fp8 is a bit unstable on chroma in particular. (4) note we have a discord for general support https://discord.gg/q2y38cqjNw

I only mentioned admin because I tried it in addition to regular privileges, and I've run Chroma before without any issues. It's not starting ANYTHING though. Everything was working fine and then all the sudden it stopped after the update or reinstallation.

[xmicro]

Not sure why this was closed, but I can't reopen it. This is still an issue for me.

[mcmonkey4eva]

I gave a 4-point reply above, you only responded to 1 and 3 and ignored points 2 and 4

[xmicro]

I gave a 4-point reply above, you only responded to 1 and 3 and ignored points 2 and 4

I did not ignore them. I responded to the ones that were answerable. I am unable to post the full log now because I'm not home, but I will later. But the issue still isn't solved...

[xmicro]

So debug reveals no issues at all:

2025-10-26 22:48:16.507 [Init] === SwarmUI v0.9.7.1 Starting at 2025-10-26 22:48:16 ===
2025-10-26 22:48:16.728 [Init] Prepping extension: SwarmUI.Builtin_ScorersExtension.ScorersExtension...
2025-10-26 22:48:16.736 [Init] Prepping extension: SwarmUI.Builtin_ImageBatchToolExtension.ImageBatchToolExtension...
2025-10-26 22:48:16.741 [Init] Prepping extension: SwarmUI.Builtin_GridGeneratorExtension.GridGeneratorExtension...
2025-10-26 22:48:16.750 [Init] Prepping extension: SwarmUI.Builtin_DynamicThresholding.DynamicThresholdingExtension...
2025-10-26 22:48:16.761 [Init] Prepping extension: SwarmUI.Builtin_ComfyUIBackend.ComfyUIBackendExtension...
2025-10-26 22:48:16.765 [Init] Prepping extension: SwarmUI.Builtin_AutoWebUIExtension.AutoWebUIBackendExtension...
2025-10-26 22:48:16.988 [Init] Parsing command line...
2025-10-26 22:48:17.010 [Init] Loading settings file...
2025-10-26 22:48:17.037 [Init] Re-saving settings file...
2025-10-26 22:48:17.067 [Init] Applying command line settings...
2025-10-26 22:48:17.091 [Init] SwarmUI was installed 2025-10-25 (1 days ago) with version 0.9.7.1
2025-10-26 22:48:17.095 [Init] Swarm base path is: C:\Users\Jrwhe\Documents\swarm2\SwarmUI
2025-10-26 22:48:17.100 [Init] Running on OS: Microsoft Windows 10.0.26100
2025-10-26 22:48:17.105 [Debug] [Load Time] Initial settings load took 0.59s (0.59s from start)
2025-10-26 22:48:17.128 [Debug] [Load Time] Extension PreInit took 0.02s (0.61s from start)
2025-10-26 22:48:17.128 [Init] Prepping options...
2025-10-26 22:48:17.260 [Debug] [Load Time] Prep Options took 0.14s (0.75s from start)
2025-10-26 22:48:17.260 [Debug] [Load Time] Web PreInit took 0s (0.75s from start)
2025-10-26 22:48:17.272 [Debug] [Load Time] Extensions Init took 0s (0.75s from start)
2025-10-26 22:48:17.274 [Debug] [Load Time] Prep Utils took 0.02s (0.77s from start)
2025-10-26 22:48:17.310 [Init] CPU Cores: 32 | RAM: 31.75 GiB total, 2.32 GiB available, 73.12 GiB total page file, 33.63 GiB available page file
2025-10-26 22:48:17.313 [Debug] [Load Time] Languages load took 0.03s (0.8s from start)
2025-10-26 22:48:17.313 [Init] Loading models list...
2025-10-26 22:48:17.314 [Init] GPU 0: NVIDIA GeForce RTX 4090 Laptop GPU | Temp 36C | Util 0% GPU, 0% Memory | VRAM 15.99 GiB total, 15.60 GiB free, 73.00 MiB used
2025-10-26 22:48:17.315 [Init] Will use GPU accelerations specific to NVIDIA GeForce RTX 40xx series and newer.
2025-10-26 22:48:17.352 [Debug] Have 1 Stable-Diffusion models.
2025-10-26 22:48:17.354 [Debug] Have 1 VAE models.
2025-10-26 22:48:17.356 [Debug] Have 1 LoRA models.
2025-10-26 22:48:17.356 [Debug] Have 0 Embedding models.
2025-10-26 22:48:17.357 [Debug] Have 0 ControlNet models.
2025-10-26 22:48:17.358 [Debug] Have 2 Clip models.
2025-10-26 22:48:17.358 [Debug] Have 0 ClipVision models.
2025-10-26 22:48:17.360 [Debug] [Load Time] Model listing took 0.05s (0.84s from start)
2025-10-26 22:48:17.360 [Init] Loading backends...
2025-10-26 22:48:17.363 [Init] Loading backends from file...
2025-10-26 22:48:17.367 [Debug] [Load ComfyUI Self-Starting #0] Waiting to load...
2025-10-26 22:48:17.369 [Debug] [Load ComfyUI Self-Starting #0] Will now load...
2025-10-26 22:48:17.369 [Init] Initializing backend #0 - ComfyUI Self-Starting...
2025-10-26 22:48:17.370 [Debug] [Load Time] Backends took 0.02s (0.86s from start)
2025-10-26 22:48:17.370 [Init] Prepping API...
2025-10-26 22:48:17.373 [Debug] [Load ComfyUI Self-Starting #0] Starting init...
2025-10-26 22:48:17.375 [Debug] [Load ComfyUI Self-Starting #0] Will emit comfy model paths file...
2025-10-26 22:48:17.375 [Debug] [Load Time] API took 0s (0.86s from start)
2025-10-26 22:48:17.375 [Init] Prepping webserver...
2025-10-26 22:48:17.377 [Init] Backend request handler loop ready...
2025-10-26 22:48:17.379 [Debug] [Load ComfyUI Self-Starting #0] Done emitting comfy model paths file.
2025-10-26 22:48:17.379 [Debug] [Load ComfyUI Self-Starting #0] Will add args:  --extra-model-paths-config C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Data/comfy-auto-model.yaml --fast fp16_accumulation cublas_ops --preview-method latent2rgb --front-end-version Comfy-Org/ComfyUI_frontend@v1.28.7
2025-10-26 22:48:17.380 [Debug] [Load ComfyUI Self-Starting #0] Will track node repo load task...
2025-10-26 22:48:17.380 [Debug] [Load ComfyUI Self-Starting #0] Will track comfy git pull auto-update task...
2025-10-26 22:48:17.380 [Debug] [Load ComfyUI Self-Starting #0] Waiting on git tasks to complete...
2025-10-26 22:48:17.381 [Debug] [Load ComfyUI Self-Starting #0] Running git pull in comfy folder...
2025-10-26 22:48:17.445 [Debug] [Load ComfyUI Self-Starting #0] Will ensure all node repos...
2025-10-26 22:48:17.446 [Debug] [Load ComfyUI Self-Starting #0] Done ensuring all node repos.
2025-10-26 22:48:18.233 [Debug] [Load Time] [Web] WebApp builder prep took 0.47s (0.47s from start)
2025-10-26 22:48:18.609 [Init] Current git commit is [4725a6c4: patch autoscaler shutdown bug], marked as date 2025-10-24 19:53:03 (2 days ago)
2025-10-26 22:48:18.670 [Init] Swarm is up to date! You have version 0.9.7.1, and 0.9.7-Beta is the latest.
2025-10-26 22:48:18.723 [Debug] [Load Time] [Web] WebApp build took 0.48s (0.95s from start)
2025-10-26 22:48:18.723 [Debug] [Load Time] [Web] exception handler took 0s (0.95s from start)
2025-10-26 22:48:18.723 [Debug] [Load Time] [Web] StartStop handler took 0s (0.95s from start)
2025-10-26 22:48:18.723 [Debug] [Load Time] [Web] static files took 0s (0.95s from start)
2025-10-26 22:48:18.852 [Debug] [Load Time] [Web] core use calls took 0.13s (1.08s from start)
2025-10-26 22:48:18.891 [Debug] [Load ComfyUI Self-Starting #0] Comfy git pull response: Updating 426cde37..c170fd2d
Fast-forward
 .github/workflows/windows_release_dependencies.yml |   4 +-
 comfy/model_management.py                          |   1 +
 comfy/sample.py                                    |   2 +-
 comfy_api_nodes/apinode_utils.py                   |  26 -
 comfy_api_nodes/nodes_gemini.py                    | 607 +++++++++------------
 comfy_api_nodes/util/__init__.py                   |   2 +
 comfy_api_nodes/util/client.py                     |  15 +-
 comfy_api_nodes/util/conversions.py                |  25 +
 comfy_api_nodes/util/download_helpers.py           |   6 +-
 comfy_api_nodes/util/upload_helpers.py             |   4 +-
 10 files changed, 285 insertions(+), 407 deletions(-)

From https://github.com/comfyanonymous/ComfyUI
   426cde37..c170fd2d  master     -> origin/master
2025-10-26 22:48:18.891 [Debug] [Load ComfyUI Self-Starting #0] All tasks done.
2025-10-26 22:48:18.895 [Debug] [Load ComfyUI Self-Starting #0] Will validate required libs...
2025-10-26 22:48:18.896 [Debug] [Load ComfyUI Self-Starting #0] Done validating required libs.
2025-10-26 22:48:18.896 [Debug] [Load ComfyUI Self-Starting #0] Starting self-start ComfyUI process...
2025-10-26 22:48:18.898 [Debug] [Load ComfyUI Self-Starting #0] Requested generic launch of dlbackend/comfy/ComfyUI/main.py on GPU 0 from ComfyUI-0
2025-10-26 22:48:18.903 [Debug] [Load Time] [Web] core maps took 0.06s (1.14s from start)
2025-10-26 22:48:18.903 [Init] Scan for web extensions...
2025-10-26 22:48:18.905 [Debug] [Load Time] [Web] end took 0s (1.14s from start)
2025-10-26 22:48:18.905 [Debug] [Load Time] Web prep took 1.53s (2.39s from start)
2025-10-26 22:48:18.905 [Init] Readying extensions for launch...
2025-10-26 22:48:18.906 [Debug] [Load Time] Extensions pre-launch took 0s (2.39s from start)
2025-10-26 22:48:18.906 [Init] Launching server...
2025-10-26 22:48:18.909 [Debug] Python paths left: C:\Users\Jrwhe\AppData\Local\Python\bin
2025-10-26 22:48:18.909 [Debug] (ComfyUI-0 launch) Adding path C:\Users\Jrwhe\Documents\swarm2\SwarmUI\dlbackend\comfy\python_embeded
2025-10-26 22:48:18.909 [Debug] [Load ComfyUI Self-Starting #0] (ComfyUI-0 launch) Will use python: C:\Users\Jrwhe\Documents\swarm2\SwarmUI\dlbackend\comfy\python_embeded\python.exe
2025-10-26 22:48:18.909 [Debug] [Load ComfyUI Self-Starting #0] Will start process...
2025-10-26 22:48:18.909 [Init] Starting webserver on http://localhost:7801
2025-10-26 22:48:18.930 [Init] Self-Start ComfyUI-0 on port 7821 is loading...
2025-10-26 22:48:19.024 [Debug] [Load Time] Web launch took 0.13s (2.52s from start)
2025-10-26 22:48:19.024 [Init] SwarmUI v0.9.7.1 - Local is now running.
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path checkpoints C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\Stable-Diffusion
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path vae C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\VAE
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path loras C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\Lora
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path loras C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\LyCORIS
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path upscale_models C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\ESRGAN
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path upscale_models C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\RealESRGAN
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path upscale_models C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\SwinIR
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path upscale_models C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\upscale-models
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path upscale_models C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\upscale_models
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path embeddings C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\Embeddings
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path hypernetworks C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\hypernetworks
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path controlnet C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\controlnet
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path clip C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\clip
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path clip_vision C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\clip_vision
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path unet C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\unet
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path diffusion_models C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\diffusion_models
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path gligen C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\gligen
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path ipadapter C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\ipadapter
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path yolov8 C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\yolov8
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path tensorrt C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\tensorrt
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path clipseg C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\clipseg
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path style_models C:\Users\Jrwhe\Documents\swarm2\SwarmUI\Models\style_models
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path custom_nodes C:\Users\Jrwhe\Documents\swarm2\SwarmUI\src\BuiltinExtensions\ComfyUIBackend\DLNodes
2025-10-26 22:48:19.220 [Debug] [ComfyUI-0/STDERR] Adding extra search path custom_nodes C:\Users\Jrwhe\Documents\swarm2\SwarmUI\src\BuiltinExtensions\ComfyUIBackend\ExtraNodes
2025-10-26 22:48:19.531 [Init] Launch web browser...
2025-10-26 22:48:19.948 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:48:21.057 [Info] Creating new session 'local' for ::1
2025-10-26 22:48:24.715 [Debug] [ComfyUI-0/STDERR] Checkpoint files will always be loaded safely.
2025-10-26 22:48:25.097 [Debug] [ComfyUI-0/STDERR] Total VRAM 16376 MB, total RAM 32508 MB
2025-10-26 22:48:25.097 [Debug] [ComfyUI-0/STDERR] pytorch version: 2.7.1+cu128
2025-10-26 22:48:25.098 [Debug] [ComfyUI-0/STDERR] Enabled fp16 accumulation.
2025-10-26 22:48:25.098 [Debug] [ComfyUI-0/STDERR] Set vram state to: NORMAL_VRAM
2025-10-26 22:48:25.099 [Debug] [ComfyUI-0/STDERR] Device: cuda:0 NVIDIA GeForce RTX 4090 Laptop GPU : cudaMallocAsync
2025-10-26 22:48:27.664 [Debug] [ComfyUI-0/STDERR] Using pytorch attention
2025-10-26 22:48:32.992 [Debug] [ComfyUI-0/STDERR] Python version: 3.12.10 (tags/v3.12.10:0cc8128, Apr  8 2025, 12:21:36) [MSC v.1943 64 bit (AMD64)]
2025-10-26 22:48:32.992 [Debug] [ComfyUI-0/STDERR] ComfyUI version: 0.3.66
2025-10-26 22:48:33.046 [Debug] [ComfyUI-0/STDERR] Using existing copy of specific frontend version tag: Comfy-Org/ComfyUI_frontend@v1.28.7
2025-10-26 22:48:33.046 [Debug] [ComfyUI-0/STDERR] [Prompt Server] web root: C:\Users\Jrwhe\Documents\swarm2\SwarmUI\dlbackend\comfy\ComfyUI\web_custom_versions\Comfy-Org_ComfyUI_frontend\1.28.7
2025-10-26 22:48:35.721 [Debug] [ComfyUI-0/STDERR] 
2025-10-26 22:48:35.721 [Debug] [ComfyUI-0/STDERR] Import times for custom nodes:
2025-10-26 22:48:35.721 [Debug] [ComfyUI-0/STDERR]    0.0 seconds: C:\Users\Jrwhe\Documents\swarm2\SwarmUI\dlbackend\comfy\ComfyUI\custom_nodes\websocket_image_save.py
2025-10-26 22:48:35.721 [Debug] [ComfyUI-0/STDERR]    0.1 seconds: C:\Users\Jrwhe\Documents\swarm2\SwarmUI\src\BuiltinExtensions\ComfyUIBackend\ExtraNodes\SwarmComfyExtra
2025-10-26 22:48:35.721 [Debug] [ComfyUI-0/STDERR]    0.5 seconds: C:\Users\Jrwhe\Documents\swarm2\SwarmUI\src\BuiltinExtensions\ComfyUIBackend\ExtraNodes\SwarmComfyCommon
2025-10-26 22:48:35.721 [Debug] [ComfyUI-0/STDERR] 
2025-10-26 22:48:36.180 [Debug] [ComfyUI-0/STDERR] Context impl SQLiteImpl.
2025-10-26 22:48:36.180 [Debug] [ComfyUI-0/STDERR] Will assume non-transactional DDL.
2025-10-26 22:48:36.183 [Debug] [ComfyUI-0/STDERR] No target revision found.
2025-10-26 22:48:36.213 [Debug] [ComfyUI-0/STDERR] Starting server
2025-10-26 22:48:36.213 [Debug] [ComfyUI-0/STDERR] 
2025-10-26 22:48:36.215 [Debug] [ComfyUI-0/STDERR] To see the GUI go to: http://127.0.0.1:7821
2025-10-26 22:48:36.258 [Debug] User local requested check for updates.
2025-10-26 22:48:37.210 [Debug] Update check complete - 7 Swarm commits, 0 extensions, 0 backends.
2025-10-26 22:49:20.969 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...

However, this last line keeps repeating...
2025-10-26 22:49:20.969 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:49:20.969 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:49:20.969 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
Without resolve. This gives more insight into why the "Backends are still loading on the server..." is occuring, but not what's causing it.
Inspecting verbose logs has a little more info, but still not sure what's causing this.

2025-10-26 22:49:19.965 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-26 22:49:20.969 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:49:20.969 [Verbose] Comfy backend 0 loading value set...
2025-10-26 22:50:20.978 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-26 22:50:21.992 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:50:21.992 [Verbose] Comfy backend 0 loading value set...
2025-10-26 22:51:22.002 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-26 22:51:23.012 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:51:23.012 [Verbose] Comfy backend 0 loading value set...
2025-10-26 22:52:23.028 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-26 22:52:24.030 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:52:24.030 [Verbose] Comfy backend 0 loading value set...
2025-10-26 22:53:24.043 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-26 22:53:25.056 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-26 22:53:25.056 [Verbose] Comfy backend 0 loading value set...
2025-10-26 22:53:31.142 [Debug] [Load ComfyUI Self-Starting #0] Got valid value set, will parse...
2025-10-26 22:53:31.142 [Verbose] Comfy backend 0 loaded value set, parsing...
2025-10-26 22:53:31.143 [Verbose] Comfy backend 0 using model folder format: forward slash / as no backslash was found
2025-10-26 22:53:31.146 [Verbose] Comfy backend 0 loaded value set and parsed.
2025-10-26 22:53:31.146 [Debug] [Load ComfyUI Self-Starting #0] Done parsing value set.
2025-10-26 22:53:31.146 [Debug] [Load ComfyUI Self-Starting #0] Done! Started!
2025-10-26 22:53:31.146 [Init] Self-Start ComfyUI-0 on port 7821 started.
2025-10-26 22:53:31.151 [Debug] [Load ComfyUI Self-Starting #0] ComfyUI-0 self-start port 7821 loop ending (should now be alive)
2025-10-26 22:53:33.088 [Verbose] User local triggered a strong data refresh
2025-10-26 22:53:33.090 [Verbose] Comfy backend 0 loading value set...
2025-10-26 22:53:33.140 [Debug] [Load ComfyUI Self-Starting #0] Got valid value set, will parse...
2025-10-26 22:53:33.140 [Verbose] Comfy backend 0 loaded value set, parsing...
2025-10-26 22:53:33.140 [Verbose] Comfy backend 0 using model folder format: forward slash / as no backslash was found
2025-10-26 22:53:33.141 [Verbose] Comfy backend 0 loaded value set and parsed.
2025-10-26 22:53:33.141 [Debug] [Load ComfyUI Self-Starting #0] Done parsing value set.
2025-10-26 22:53:33.141 [Verbose] [Model Scan] Add all Stable-Diffusion from folder 
2025-10-26 22:53:33.141 [Verbose] [Model Scan] Add all Stable-Diffusion from folder 
2025-10-26 22:53:33.141 [Verbose] [Model Scan] Add all Stable-Diffusion from folder 
2025-10-26 22:53:33.142 [Verbose] [Model Scan] Add all Stable-Diffusion from folder 
2025-10-26 22:53:33.142 [Debug] Have 1 Stable-Diffusion models.
2025-10-26 22:53:33.142 [Verbose] [Model Scan] Add all VAE from folder 
2025-10-26 22:53:33.142 [Verbose] [Model Scan] Add all VAE from folder Wan
2025-10-26 22:53:33.143 [Debug] Have 1 VAE models.
2025-10-26 22:53:33.143 [Verbose] [Model Scan] Add all LoRA from folder 
2025-10-26 22:53:33.144 [Debug] Have 1 LoRA models.
2025-10-26 22:53:33.144 [Verbose] [Model Scan] Add all Embedding from folder 
2025-10-26 22:53:33.144 [Debug] Have 0 Embedding models.
2025-10-26 22:53:33.144 [Verbose] [Model Scan] Add all ControlNet from folder 
2025-10-26 22:53:33.144 [Debug] Have 0 ControlNet models.
2025-10-26 22:53:33.144 [Verbose] [Model Scan] Add all Clip from folder 
2025-10-26 22:53:33.147 [Debug] Have 2 Clip models.
2025-10-26 22:53:33.147 [Verbose] [Model Scan] Add all ClipVision from folder 
2025-10-26 22:53:33.147 [Debug] Have 0 ClipVision models.
2025-10-26 22:53:33.147 [Debug] Data refreshed!

So, it indeed hangs with the error "Backends are still loading on the server..." for several minutes, but does finally succeed at loading the value set after many failed attempts, which is caused by unknown reason. This is the first bug I'm seeing.
Sometimes the

2025-10-27 00:09:32.231 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-27 00:09:32.231 [Verbose] Comfy backend 0 loading value set...
2025-10-27 00:10:32.240 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-27 00:10:33.252 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-27 00:10:33.252 [Verbose] Comfy backend 0 loading value set...
2025-10-27 00:11:33.265 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-27 00:11:34.269 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-27 00:11:34.269 [Verbose] Comfy backend 0 loading value set...
2025-10-27 00:12:34.281 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-27 00:12:35.288 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-27 00:12:35.288 [Verbose] Comfy backend 0 loading value set...
2025-10-27 00:13:35.293 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-27 00:13:36.308 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-27 00:13:36.308 [Verbose] Comfy backend 0 loading value set...
2025-10-27 00:14:36.316 [Verbose] Comfy backend 0 failed to load value set, but ignoring error: TaskCanceledException: A task was canceled.
2025-10-27 00:14:37.329 [Debug] [Load ComfyUI Self-Starting #0] Will attempt to load value set...
2025-10-27 00:14:37.329 [Verbose] Comfy backend 0 loading value set...

will just go on forever though it seems...

If I get lucky and it gets up and running, and then when I go to load the model/start the generation, I get (in debug):

2025-10-26 22:56:30.032 [Info] User local requested 1 image with model 'chroma_v10HD.safetensors'...
2025-10-26 22:56:30.042 [Debug] [BackendHandler] Backend request #1 for model chroma_v10HD.safetensors, maxWait=7.00:00:00.
2025-10-26 22:56:30.047 [Debug] [BackendHandler] backend #0 will load a model: C:/Users/Jrwhe/Documents/swarm2/SwarmUI/Models/diffusion_models/chroma_v10HD.safetensors, with 1 requests waiting for 0 seconds

But this just sits without updating for 5-10+ minutes. Verbose logs doesn't reveal much more useful info, though does reveal a repeating loop:

2025-10-26 23:01:09.925 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:09.925 [Verbose] [BackendHandler] A backend is currently loading the model.
2025-10-26 23:01:10.938 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:10.938 [Verbose] [BackendHandler] A backend is currently loading the model.
2025-10-26 23:01:11.949 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:11.949 [Verbose] [BackendHandler] A backend is currently loading the model.
2025-10-26 23:01:12.956 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:12.956 [Verbose] [BackendHandler] A backend is currently loading the model.
2025-10-26 23:01:13.970 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:13.970 [Verbose] [BackendHandler] A backend is currently loading the model.
2025-10-26 23:01:14.982 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:14.982 [Verbose] [BackendHandler] A backend is currently loading the model.
2025-10-26 23:01:15.995 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:15.995 [Verbose] [BackendHandler] A backend is currently loading the model.
2025-10-26 23:01:17.001 [Verbose] [BackendHandler] Backend request #1 searching for backend... have 1/1 possible
2025-10-26 23:01:17.001 [Verbose] [BackendHandler] A backend is currently loading the model.

This goes on indefinitely (went on for thousands of lines when I left it for a while), and the log was highly truncated for obvious reasons... And I've never had it hang this long on loading a model before. This is a second bug I'm seeing.

Edit: GitHub formatting hard

[xmicro]

@mcmonkey4eva

[mcmonkey4eva]

2025-10-26 22:48:17.310 [Init] CPU Cores: 32 | RAM: 31.75 GiB total, 2.32 GiB available,
At the time you booted swarm, you had two gigabytes of RAM free. That's not enough to load Chroma at all. You likely have some other process on your system hogging all your memory - the reason it worked before but not now is that process wasn't occupying your memory before.

[xmicro]

2025-10-26 22:48:17.310 [Init] CPU Cores: 32 | RAM: 31.75 GiB total, 2.32 GiB available, At the time you booted swarm, you had two gigabytes of RAM free. That's not enough to load Chroma at all. You likely have some other process on your system hogging all your memory - the reason it worked before but not now is that process wasn't occupying your memory before.

Not sure why it's saying that, must be a transient spike on launch or a fluke. I assure you I have plenty of free RAM. I'm hardly using 50% of my system RAM when generating. I can run Chroma fine on Forge or ComfyUI without any such issues. And like I said, I used to use Swarm without issues before this update. Don't know why you're drilling specs so hard when I keep telling you it's not the problem.

Oddly, I got it to load the model once when I tried loading the model manually as opposed to letting it be loaded via pressing generate first. Apparently I'm not the only one having this issue. https://www.reddit.com/r/StableDiffusion/comments/1n8vvu1/swarmui_v0970_new_model_loading_issue_workaround/ But it's not consistent for me, and many of the times even when doing it that way it will exhibit this looping/hanging behavior.

[mcmonkey4eva]

There's no "new model loading" in Swarm, nothing's changed about how models load in forever (other than, yknow, chroma not existing for that long), and Swarm's backend that does the actual loading is literally Comfy, so if it works fine in Comfy then it works fine in Swarm. If it doesn't work fine in swarm, it doesn't work fine in comfy.

If you want to have an argument and blame things, we're gonna get nowhere.

If you want to start actually looking at potential problem areas and debugging, we can potentially find what's wrong.

So, please open and monitor task manager while the model is loading, and see where the system resource usage is - I strongly suspect you'll see maxed out RAM, but if you don't, the actual information of what's being used and how will be very informative.

Chroma HD in its standard 16-bit model (as opposed to the silveroxides fp8 upload) is 18 gigabytes of data, and comfy's safetensors loading code can use up to 2x the size of a model file of ram to load, ie the max potential ram requirement to load that model (2x18=36GB) is more than your total ram available, and the minimum requirement (18 GB) is already enough to fill a very large chunk, if you're at 50% usage that'll cross the line. If you use the fp8 https://huggingface.co/silveroxides/Chroma1-HD-fp8-scaled/tree/main the requirement is much lower (albeit chroma is known to be rather unstable, and is one of very select few model types that swarm won't just automatically force to fp8 due to that stability issue).