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930494d687
MCP stdio servers are spawned via the SDK's stdio_client, which on Linux uses start_new_session=True (setsid). When a cron job is cancelled mid-way (timeout, agent finish, exception), the subprocess often escapes the SDK's teardown and survives as a session leader. Because setsid() detaches the child from the gateway's process group / cgroup tree, systemd does not reap it on service restart either — so every cron tick that touches an MCP tool leaks a dangling server process. Fix: * tools/mcp_tool.py — _run_stdio now wraps the whole stdio+session context in try/finally. On any exit path (clean, exception, cancellation), PIDs still alive are moved from the active _stdio_pids set into a new _orphan_stdio_pids set. Orphan detection is done via os.kill(pid, 0) — a cheap liveness probe that never signals the target. * tools/mcp_tool.py — _kill_orphaned_mcp_children gains an include_active=False flag. Default behaviour now only reaps the orphan set so concurrent sessions (other parallel cron jobs or live user chats) are never disrupted. The existing shutdown path passes include_active=True to keep the previous "kill everything" semantics after the MCP loop is stopped. * cron/scheduler.py — the cleanup hook is moved from run_job()'s finally (which would race with parallel siblings after #13021) into tick() after the ThreadPoolExecutor has joined every future. At that point there are no in-flight sessions from this tick, so sweeping the orphan set is always safe. Net effect: zero regression for healthy sessions, and orphan MCP servers no longer accumulate between gateway restarts. Made-with: Cursor |
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| .. | ||
| acp | ||
| agent | ||
| cli | ||
| cron | ||
| e2e | ||
| environments/benchmarks | ||
| fakes | ||
| gateway | ||
| hermes_cli | ||
| hermes_state | ||
| honcho_plugin | ||
| integration | ||
| plugins | ||
| run_agent | ||
| skills | ||
| tools | ||
| tui_gateway | ||
| __init__.py | ||
| conftest.py | ||
| run_interrupt_test.py | ||
| test_account_usage.py | ||
| test_base_url_hostname.py | ||
| test_batch_runner_checkpoint.py | ||
| test_cli_file_drop.py | ||
| test_cli_skin_integration.py | ||
| test_ctx_halving_fix.py | ||
| test_empty_model_fallback.py | ||
| test_evidence_store.py | ||
| test_hermes_constants.py | ||
| test_hermes_logging.py | ||
| test_hermes_state.py | ||
| test_honcho_client_config.py | ||
| test_ipv4_preference.py | ||
| test_mcp_serve.py | ||
| test_mini_swe_runner.py | ||
| test_minimax_model_validation.py | ||
| test_minisweagent_path.py | ||
| test_model_picker_scroll.py | ||
| test_model_tools.py | ||
| test_model_tools_async_bridge.py | ||
| test_ollama_num_ctx.py | ||
| test_packaging_metadata.py | ||
| test_plugin_skills.py | ||
| test_project_metadata.py | ||
| test_retry_utils.py | ||
| test_sql_injection.py | ||
| test_subprocess_home_isolation.py | ||
| test_timezone.py | ||
| test_toolset_distributions.py | ||
| test_toolsets.py | ||
| test_trajectory_compressor.py | ||
| test_trajectory_compressor_async.py | ||
| test_transform_tool_result_hook.py | ||
| test_tui_gateway_server.py | ||
| test_utils_truthy_values.py | ||