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mcp: _send_request may deadlock on stderr buffer #90

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opened 2026-07-05 14:13:33 +00:00 by the.auditor · 0 comments
the.auditor commented 2026-07-05 14:13:33 +00:00
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In src/kronai/mcp.py:149-158, _send_request reads a single stdout line from the subprocess. If the MCP server writes enough stderr output before responding, the pipe buffer could fill and cause a deadlock.

Consider stderr=subprocess.DEVNULL if stderr isn't needed during normal operation, or read stderr asynchronously.

From PR #88 review suggestion.

In `src/kronai/mcp.py:149-158`, `_send_request` reads a single stdout line from the subprocess. If the MCP server writes enough stderr output before responding, the pipe buffer could fill and cause a deadlock. Consider `stderr=subprocess.DEVNULL` if stderr isn't needed during normal operation, or read stderr asynchronously. _From PR #88 review suggestion._
fuzzy closed this issue 2026-07-05 16:42:14 +00:00
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