LSP idle subprocess reaping and memory leak

NousResearch/hermes-agent · cluster 25016 · agent/lsp

Data as of 2026-10-21 12:10 UTC

Nothing open on GitHub. Fix merged in #74058. Check it covers your case.

open issues

open PRs

items grouped

Known?: Yes. 17 related items grouped here, 4 issues already closed.
Fix event: A fix was merged to main in PR #74058. Check it covers your case. No release data is tracked.
Tracker: The maintainers' tracker marks this partially resolved, deciding PR #74058. That is separate from the fix event.
Still open: Nothing open on GitHub.

Next step: read #74058, then check it covers your case.

Read #74058 Pick up a Lab task

These issues and pull requests concern LSP language-server processes that are never terminated when idle, causing unbounded memory accumulation in long-running sessions. The work involves adding or enforcing an idle timeout and background reaper to shut down inactive language-server subprocesses.

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.

#74058 fix(lsp): reap idle language servers (salvage #64141, closes #25016)

merged to main

files: agent/lsp/eventlog.py, agent/lsp/manager.py, contributors/emails/[redacted:email], hermes_cli/config.py, tests/agent/lsp/test_service.py, website/docs/user-guide/features/lsp.md

12 PRs closed without merging

From the close comments: done elsewhere 9 · duplicate 3

#25021 fix(lsp): add idle-subprocess reaper to reclaim memory during long sessions · done elsewhere
#25109 fix: reap idle LSP subprocesses to stop memory leak · done elsewhere → #74058, #25016
#36684 Fix LSP idle reaper: add background task to reap idle language-server clients · done elsewhere → #74058, #64141, #25016
#36892 fix(lsp): reap idle language-server clients · done elsewhere → #74058, #25016
#47332 feat(lsp): add idle timeout to shut down inactive LSP clients · done elsewhere → #74058, #25016

Show 7 more

#52751 fix(lsp): add idle client reaper to prevent memory leak · done elsewhere → #74058, #25016
#53430 fix(lsp): reap idle language servers (DEFAULT_IDLE_TIMEOUT was never enforced) · duplicate → #36684, #36681, #25016, #52751
#62995 fix(lsp): reap idle servers and terminate process groups · done elsewhere → #74058, #25016
#64980 fix(lsp): bound language-server lifecycle safely · done elsewhere → #25016, #74058, #64141
#68091 fix: reap idle LSP clients · done elsewhere → #74058, #25016
#73057 fix(lsp): add idle subprocess reaper (#25016) · duplicate → #36684, #25016
#73794 fix(lsp): add idle subprocess reaper to reclaim memory (#25016) · duplicate → #36684, #25016

Closed issues · 4

Closed#25016lsp: idle subprocesses are never reaped — long-lived gateways accumulate ~200 MB per server forever
Closed#36681LSP language-server processes accumulate indefinitely in long-running gateways (missing idle reaper)
Closed#38365LSP idle timeout is declared but not enforced, leaving TypeScript tsserver processes alive
Closed#47314[Feature]: Add idle timeout for LSP processes to reduce memory footprint

How this cluster was grouped

Link evidence (partly structural links): some members are connected by structural evidence (shared changed files, or a closing/superseded reference); the rest are joined by an automated relevance judgement over their text.
Members outside that structural core may belong to a different underlying problem.
Pairwise link density 0.16: 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

Subsystem: agent/lsp
Merged PRs: #74058
Closed issues: 4
Attempts: 12 PRs closed without merging
Fix link checked: 29 Jul 2026

For your agent

The same facts, typed.

cluster/25016.json
cluster/25016.md