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PyCharm 2026.2 AI Assistant spawns 15-22 opencode.exe acp processes on startup, causing memory exhaustion and crash (0xC0000409) #40693
Description
Description
When PyCharm 2026.2 starts with the AI Assistant configured to use opencode as an ACP provider, the AI Assistant bulk-creates 15-22 chat sessions during IDE initialization. Each session independently spawns a separate opencode.exe acp process, and each process goes through full initialization (model loading, MCP server connections, etc.). This causes memory usage to spike to 100%, eventually crashing PyCharm with exit code 0xC0000409 (STATUS_STACK_BUFFER_OVERRUN).
The following workarounds are NOT acceptable:
- Disabling JetBrains Client Protocol (JCP)
- Uninstalling the ml-llm plugin
Requirement: keep opencode usable inside the IDE via AI Assistant's ACP integration, while preventing the startup-time chat/process explosion.
Plugins
- JetBrains AI Assistant (bundled with PyCharm 2026.2) - opencode ACP integration (configured as AI Assistant ACP provider)
OpenCode version
1.18.12
Steps to reproduce
- Install PyCharm 2026.2, configure AI Assistant to use opencode as ACP provider
- Start PyCharm
- Observe in Task Manager: opencode.exe acp process count rapidly grows from 0 to 15-22
- Memory usage climbs to near 100%
- PyCharm crashes; Event Viewer shows exception code 0xC0000409
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github-actions commentedon Aug 5, 2026
This issue might be a duplicate of existing issues. Please check:
If your issue is specifically about ACP bulk-creating sessions during PyCharm IDE initialization triggering the process explosion, it may be a distinct root cause worth keeping separate. But please review the above issues first to see if they cover your scenario.