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[GH-ISSUE #20196] Open WebUI hangs streaming when pipe returns AsyncGenerator (UI stuck “executing”) #34649

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opened 2026-04-25 08:44:05 -05:00 by GiteaMirror · 2 comments
GiteaMirror commented 2026-04-25 08:44:05 -05:00
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Originally created by @dhaern on GitHub (Dec 27, 2025).
Original GitHub issue: https://github.com/open-webui/open-webui/issues/20196

Check Existing Issues

  • I have searched for any existing and/or related issues.
  • I have searched for any existing and/or related discussions.
  • I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!).
  • I am using the latest version of Open WebUI.

Installation Method

Pip Install

Open WebUI Version

v0.6.43

Ollama Version (if applicable)

No response

Operating System

Ubuntu 24.04 ARM64

Browser (if applicable)

Zen Browser

Confirmation

  • I have read and followed all instructions in README.md.
  • I am using the latest version of both Open WebUI and Ollama.
  • I have included the browser console logs.
  • I have included the Docker container logs.
  • I have provided every relevant configuration, setting, and environment variable used in my setup.
  • I have clearly listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc).
  • I have documented step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation. My steps:
  • Start with the initial platform/version/OS and dependencies used,
  • Specify exact install/launch/configure commands,
  • List URLs visited, user input (incl. example values/emails/passwords if needed),
  • Describe all options and toggles enabled or changed,
  • Include any files or environmental changes,
  • Identify the expected and actual result at each stage,
  • Ensure any reasonably skilled user can follow and hit the same issue.

Expected Behavior

Streaming responses from a pipe should complete and the UI should exit “executing/streaming” state when the model finishes.

Actual Behavior

When a pipe returns an AsyncGenerator, the UI stays in “executing” indefinitely after the response text has already finished. Reloading the page can cause the response to disappear while the request still appears active.

Steps to Reproduce

  1. Install Open WebUI v0.6.43 (systemd service, venv at /home/raxxor/IA/openwebui/venv).
  2. Create a custom pipe that returns an AsyncGenerator (example: async def pipe(...) returning an asyncgenerator that yields chunks).
  3. Enable streaming in the UI (default).
  4. Use any model backed by that pipe and send a short message (e.g., “Hola”).
  5. Observe: model outputs text correctly, but UI remains in “executing/streaming” state and never finishes.
  6. Reload the page: the response may disappear, while the request appears to have never closed.

Logs & Screenshots

Server log shows finishReason=STOP from the pipe stream (example line): ...[Antigravity Internal] Stream finishReason=STOP

No [DONE] or completion signal is observed at the UI level.

Additional Information

Environment is non-Docker, systemd-managed.
Problem is pipe-specific: switching the pipe back to synchronous generator (def pipe returning Generator) fixes the issue.
This suggests Open WebUI v0.6.43 does not reliably finalize AsyncGenerator streams for custom pipes.
It is not limited to a specific model; any pipe returning AsyncGenerator reproduces.

Originally created by @dhaern on GitHub (Dec 27, 2025). Original GitHub issue: https://github.com/open-webui/open-webui/issues/20196 ### Check Existing Issues - [x] I have searched for any existing and/or related issues. - [x] I have searched for any existing and/or related discussions. - [x] I have also searched in the CLOSED issues AND CLOSED discussions and found no related items (your issue might already be addressed on the development branch!). - [x] I am using the latest version of Open WebUI. ### Installation Method Pip Install ### Open WebUI Version v0.6.43 ### Ollama Version (if applicable) _No response_ ### Operating System Ubuntu 24.04 ARM64 ### Browser (if applicable) Zen Browser ### Confirmation - [x] I have read and followed all instructions in `README.md`. - [x] I am using the latest version of **both** Open WebUI and Ollama. - [x] I have included the browser console logs. - [x] I have included the Docker container logs. - [x] I have **provided every relevant configuration, setting, and environment variable used in my setup.** - [x] I have clearly **listed every relevant configuration, custom setting, environment variable, and command-line option that influences my setup** (such as Docker Compose overrides, .env values, browser settings, authentication configurations, etc). - [x] I have documented **step-by-step reproduction instructions that are precise, sequential, and leave nothing to interpretation**. My steps: - Start with the initial platform/version/OS and dependencies used, - Specify exact install/launch/configure commands, - List URLs visited, user input (incl. example values/emails/passwords if needed), - Describe all options and toggles enabled or changed, - Include any files or environmental changes, - Identify the expected and actual result at each stage, - Ensure any reasonably skilled user can follow and hit the same issue. ### Expected Behavior Streaming responses from a pipe should complete and the UI should exit “executing/streaming” state when the model finishes. ### Actual Behavior When a pipe returns an AsyncGenerator, the UI stays in “executing” indefinitely after the response text has already finished. Reloading the page can cause the response to disappear while the request still appears active. ### Steps to Reproduce 1. Install Open WebUI v0.6.43 (systemd service, venv at /home/raxxor/IA/openwebui/venv). 2. Create a custom pipe that returns an AsyncGenerator (example: async def pipe(...) returning an asyncgenerator that yields chunks). 3. Enable streaming in the UI (default). 4. Use any model backed by that pipe and send a short message (e.g., “Hola”). 5. Observe: model outputs text correctly, but UI remains in “executing/streaming” state and never finishes. 6. Reload the page: the response may disappear, while the request appears to have never closed. ### Logs & Screenshots Server log shows finishReason=STOP from the pipe stream (example line): ...[Antigravity Internal] Stream finishReason=STOP No [DONE] or completion signal is observed at the UI level. ### Additional Information Environment is non-Docker, systemd-managed. Problem is pipe-specific: switching the pipe back to synchronous generator (def pipe returning Generator) fixes the issue. This suggests Open WebUI v0.6.43 does not reliably finalize AsyncGenerator streams for custom pipes. It is not limited to a specific model; any pipe returning AsyncGenerator reproduces.
GiteaMirror added the bug label 2026-04-25 08:44:05 -05:00
GiteaMirror commented 2026-04-25 08:44:07 -05:00
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@owui-terminator[bot] commented on GitHub (Dec 27, 2025):

🔍 Similar Issues Found

I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions:

  1. #20155 issue:
    by dhaern • Dec 24, 2025 • bug

  2. #20107 issue:
    by mengdeer589 • Dec 22, 2025 • bug

  3. #20019 issue:
    by j63440490 • Dec 17, 2025 • bug

  4. #19777 issue:
    by Yaute7 • Dec 05, 2025 • bug

  5. #19877 issue:
    by dotmobo • Dec 11, 2025 • bug

Show 5 more related issues

  1. #19864 issue:
    by Haervwe • Dec 10, 2025 • bug

  2. #20092 issue:
    by VideoRyan • Dec 22, 2025 • bug

  3. #19861 issue:
    by QuitHub • Dec 10, 2025 • bug

  4. #20046 issue:
    by pierrelouisbescond • Dec 19, 2025 • bug

  5. #19563 issue:
    by naruto7g • Nov 28, 2025 • bug

💡 Tips:

  • If this is a duplicate, please consider closing this issue and adding any additional details to the existing one
  • If you found a solution in any of these issues, please share it here to help others

This comment was generated automatically by a bot. Please react with a 👍 if this comment was helpful, or a 👎 if it was not.

<!-- gh-comment-id:3693781327 --> @owui-terminator[bot] commented on GitHub (Dec 27, 2025): 🔍 **Similar Issues Found** I found some existing issues that might be related to this one. Please check if any of these are duplicates or contain helpful solutions: 1. [#20155](https://github.com/open-webui/open-webui/issues/20155) **issue:** *by dhaern • Dec 24, 2025 • `bug`* 2. [#20107](https://github.com/open-webui/open-webui/issues/20107) **issue:** *by mengdeer589 • Dec 22, 2025 • `bug`* 3. [#20019](https://github.com/open-webui/open-webui/issues/20019) **issue:** *by j63440490 • Dec 17, 2025 • `bug`* 4. [#19777](https://github.com/open-webui/open-webui/issues/19777) **issue:** *by Yaute7 • Dec 05, 2025 • `bug`* 5. [#19877](https://github.com/open-webui/open-webui/issues/19877) **issue:** *by dotmobo • Dec 11, 2025 • `bug`* <details> <summary>Show 5 more related issues</summary> 6. [#19864](https://github.com/open-webui/open-webui/issues/19864) **issue:** *by Haervwe • Dec 10, 2025 • `bug`* 7. [#20092](https://github.com/open-webui/open-webui/issues/20092) **issue:** *by VideoRyan • Dec 22, 2025 • `bug`* 8. [#19861](https://github.com/open-webui/open-webui/issues/19861) **issue:** *by QuitHub • Dec 10, 2025 • `bug`* 9. [#20046](https://github.com/open-webui/open-webui/issues/20046) **issue:** *by pierrelouisbescond • Dec 19, 2025 • `bug`* 10. [#19563](https://github.com/open-webui/open-webui/issues/19563) **issue:** *by naruto7g • Nov 28, 2025 • `bug`* </details> --- 💡 **Tips:** - If this is a duplicate, please consider closing this issue and adding any additional details to the existing one - If you found a solution in any of these issues, please share it here to help others *This comment was generated automatically by a bot.* Please react with a 👍 if this comment was helpful, or a 👎 if it was not.
GiteaMirror commented 2026-04-25 08:44:09 -05:00
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@tjbck commented on GitHub (Jan 1, 2026):

@dannyl1u @silentoplayz confirmation wanted here

@dhaern could you provide the exact function with us?

<!-- gh-comment-id:3703502632 --> @tjbck commented on GitHub (Jan 1, 2026): @dannyl1u @silentoplayz confirmation wanted here @dhaern could you provide the exact function with us?
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