Cairn

stdio MCP child death causes lifecycle busy-loop

NousResearch/hermes-agent · cluster 115483

Data as of

Nothing open on GitHub. Fix merged in #115983. Check it covers your case.

The short answer

0open issues
0open PRs
5items grouped
Known?
Yes. 5 related items grouped here, 1 issue already closed.
Fix event
A fix was merged to main in PR #115983. Check it covers your case. No release data is tracked.
Tracker
The maintainers' tracker marks this resolved, deciding PR #115983. That is separate from the fix event.
Still open
Nothing open on GitHub.

A bug where a dead stdio child process causes the MCP lifecycle task to spin in a zero-timeout loop, along with multiple fix attempts targeting the spin behavior at and after the proof deadline.

Open issues0

No open issues.

Open PRs0

No open pull requests.

Fixes on record

Merged to main. A stamp counts the issues a fix is linked to.

  • #115983 fix(mcp): a dead stdio child no longer spins the lifecycle loop after the proof deadline (#115483, salvage #115485)

    merged to main

    files: tests/tools/test_mcp_stdio_dead_reconnect.py, tools/mcp_tool_server_run.py

3 PRs closed without merging

From the close comments: merged via another change 2 · done elsewhere 1

  • #115485 fix(mcp): reconnect dead stdio child past proof deadline instead of spinning · merged via another change → #115983
  • #115513 fix(mcp): eliminate zero-timeout spin when stdio child dies before proof · merged via another change → #115485, #115983
  • #115657 fix(mcp): a dead stdio child no longer busy-loops the lifecycle task · done elsewhere → 55b6116, 6fc43ca, #115983, #115483
Closed issues · 1
  • Closed#115483[Bug]: Dead stdio MCP child causes zero-timeout lifecycle spin and starves gateway after 180s
How this cluster was grouped
  • Link evidence (structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.
  • Pairwise link density 0.40: the share of item pairs that carry a link, counting a structural link in full and a relevance-only link at 0.36. 1.00 means every pair is linked.

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At a glance

Merged PRs
#115983
Closed issues
1
Attempts
3 PRs closed without merging
Fix link checked
19 Sep 2026

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