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Bun process memory exceeds 1GB and grows unboundedly — opencode 1.18.14 on Windows #41026
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Description
Description
The Bun process backing opencode consumes over 1 GB of memory (RSS) during normal usage. Memory grows continuously over time and is never released back to the OS, consistent with Bun's mimalloc allocator not returning freed pages.
This appears to be the same class of issue as #35107 (structuredClone heap pressure) and #35847 (12h session memory leak), but is reproducible on the latest version 1.18.14 with shorter sessions — it does not require 12+ hours to manifest.
Environment
| Item | Value |
|---|---|
| opencode | 1.18.14 |
| Bun | 1.3.14 |
| OS | Windows (win32, x64) |
| Terminal | Windows Terminal |
Plugins
No response
OpenCode version
1.18.14
Steps to reproduce
- Install opencode 1.18.14 on Windows (Bun v1.3.14 bundled)
- Start a normal interactive session with multiple rounds of conversation
- Monitor the Bun process memory via Task Manager
- Observe RSS growing past 1 GB and not releasing
Screenshot and/or share link
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Operating System
Windows (win32, x64)
Terminal
Windows Terminal
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github-actions commentedon Aug 7, 2026
This issue might be a duplicate of existing issues. Please check:
If your issue is distinct from the above (e.g. it reproduces faster or has a different trigger), it may still be worth filing separately — but please consider adding a heap snapshot via the instructions in #20695, as that's the most actionable data the team can use to diagnose unbounded Bun RSS growth.
github-actions commentedon Oct 8, 2026
To stay organized issues are automatically closed after 60 days of no activity. If the issue is still relevant please open a new one.