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Subagent tasks hang indefinitely in high-concurrency environment #18378
Description
Description
When spawning multiple subagents simultaneously via the task tool in a high-concurrency environment, some subagents occasionally appear to be running (parent shows spinner) but are actually crashed or cancelled. This causes parent agents to wait indefinitely without receiving any error notification.
Visual Evidence
Parent agent shows task as "running" with active spinner animation, but subagent session is actually stuck/crashed with no further output.
Plugins
opencode-worktree@latest; pencode-notifier@latest;
OpenCode version
1.2.27
Steps to reproduce
- Create a main agent that spawns 20+ subagents concurrently using the task tool
- Wait for subagents to complete
- Observe that some subagents hang indefinitely
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Operating System
macos 26.3.1
Terminal
Ghostty
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github-actions commentedon Mar 20, 2026
This issue might be a duplicate of existing issues. Please check:
If your issue is distinct (specifically about high-concurrency / 20+ parallel subagents causing hangs rather than a single subagent hanging), please clarify what makes it different from the above.
github-actions commentedon Jul 4, 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.