Session hangs after file write tool execution with massive latency spike

Description

Bug Description

When models execute file write tool calls, the write operation completes successfully but control never returns to the session. The session hangs indefinitely.

Model Provider

This happened with big pickle and my llama.cpp server hosing gpt-oss-20b.

Log Highlight

INFO 2025-11-08T00:27:35 +89884ms service=default directory=/home/actellim/Projects/dll-experiment disposing instance

I manually killed it after ~1.5m with ctrl+c.

Expected Behavior

After file write completion, control should return to the session immediately for continued interaction.

Actual Behavior

Session hangs indefinitely after file write, requiring manual termination.

Additional Context

The file write operation itself succeeds (files are created/modified).
The issue appears to be in the post-write cleanup or response handling.
The massive ms timestamp suggests a timeout or deadlock in the cleanup process.

OpenCode version

1.0.39-1.0.44

Steps to reproduce

(I suspect this isn't a problem for everyone so I'm not sure what exactly is going sideways here).

Start an opencode session.
Request a model perform a file write operation.
Session hangs and never returns control to the user

Screenshot and/or share link

2025-11-08T002103.log

Operating System

Ubuntu 24.04

Terminal

Kitty

This issue might be a duplicate of existing issues. Please check:

Opencode sometimes hangs when running in VSCode Terminal #3975: Session hanging in VSCode Terminal after tool permission operations
No response to user input #3846: Session becomes completely unresponsive to user input, requiring process termination
bug: concurrent permissions cause app to freeze #3944: App freezes after tool permission interactions during parallel tool calls (closed but may be related)

All these issues describe similar symptoms: session hangs/freezes after tool execution with complete loss of control, requiring manual termination. The pattern suggests a systemic issue with tool execution cleanup/response handling.

Feel free to ignore if none of these address your specific case.

@actellim

@actellim what kinda file is it? It may be a formatter or lsp?

is it a .c/.cpp/.h or .py file

It's a .cpp file. The model successfully makes the edits, but control isn't returned. For the heck of it I sent a prompt after ~1.5m and it started going again, without any sort of feedback. I'm encoding the video of the session: https://github.com/user-attachments/assets/563f4e3a-a66e-405e-a98c-ea2f03b59e68

@actellim what kinda file is it? It may be a formatter or lsp?

I don't have any of those specifically enabled/disabled in my opencode.json. I've read the docs and will try disabling the .cpp lsp server and formatter and get back to you with results. It was working prior to ~1.0.39.

opencode.json

@actellim

@actellim i feel like its the lsp try disabling clangd ( in ur config )and it may fix it

looks something like:

lsp:
“clangd”:
disabled: true

im typing on phone thats why it isnt json haha

No worries. I disabled both the lsp and the formatter in the config and I'm back in business. Would like to fix, could this be an issue with the way I've got my system setup?

no i think its our fault ive heard someone have this before

we will address this over weekend

I've had a similar experience. The memory and CPU usage keep going up, and the UI becomes unresponsive. I'll try disabling the lsp, formatters, and some of my permission settings to see if I can find the culprit.

@mschenk42

@mschenk42 that may be due to really long sessions?

The formatters shouldnt cause memory spikes

If u are on latest and this still happens we have some performance improvements shipping soon

I've had a similar experience. The memory and CPU usage keep going up, and the UI becomes unresponsive. I'll try disabling the lsp, formatters, and some of my permission settings to see if I can find the culprit.

I have not experienced this issue in long sessions.

@rekram1-node

@rekram1-node , the context was under 200K, and the number of files I changed might have been a factor too. The agent was validating a lot of small data files.

I conducted additional testing and found that my issue seemed to be related to setting these permissions at the top level of my configuration.

  "permission": {
    "edit": "allow",
    "bash": "ask"
  },

When I used this configuration in the build mode, it prompted for permission frequently. Over time, this process became slow and almost unresponsive. I wonder if this is not a suitable use case for the permission system.

When I used this configuration in the build mode, it prompted for permission frequently. Over time, this process became slow and almost unresponsive. I wonder if this is not a suitable use case for the permission system.

I think im facing a similar issue, at the beginning it works fine but the more opencode asks for permissions (not even meant in a quantitive way e.g. 3 requests at once, it also happens with just one reqeust) the slower it gets.

Sometimes i hit deny or allow and ill just sit there for a minute wondering if i just hit the numpad enter again (that wont work) or its just hanging… which is pretty annoying, ive switched back to claude code for now as i dont trust these models at all with commands so i want to get asked reliably and it should work fast to approve or deny if possible.

Nonetheless i love this project and im greatful for every contributor and i cant wait to come back :)

I have exactly same issue.

It happens with 'write' , 'edit' tool use
Regardlees of the model or provider.
Regardless of LSP / Formatter / MCP disabled.
Regardless of the file type (writing/editing .txt also cause hang)
It only happens on one of my PCs.
happens on Windows conventional cmd.exe

+add
The error fixed by re-installing all packages via bun. (previously npm)

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Session hangs after file write tool execution with massive latency spike #4061

Description

Bug Description

Model Provider

Log Highlight

Expected Behavior

Actual Behavior

Additional Context

OpenCode version

Steps to reproduce

Screenshot and/or share link

Operating System

Terminal

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Session hangs after file write tool execution with massive latency spike #4061

Description

Description

Bug Description

Model Provider

Log Highlight

Expected Behavior

Actual Behavior

Additional Context

OpenCode version

Steps to reproduce

Screenshot and/or share link

Operating System

Terminal

Activity

github-actions commented on Nov 8, 2025

rekram1-node commented on Nov 8, 2025

rekram1-node commented on Nov 8, 2025

actellim commented on Nov 8, 2025

actellim commented on Nov 8, 2025

rekram1-node commented on Nov 8, 2025

actellim commented on Nov 8, 2025

rekram1-node commented on Nov 8, 2025

mschenk42 commented on Nov 9, 2025

rekram1-node commented on Nov 10, 2025

actellim commented on Nov 10, 2025

mschenk42 commented on Nov 10, 2025

mschenk42 commented on Nov 19, 2025

ojsef39 commented on Dec 4, 2025

Loxia106 commented on Jan 15, 2026

github-actions commented on Mar 26, 2026

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