NousResearch/hermes-agent

Terminal hang when backgrounding child processes

Cluster 8340. Data as of

Nothing open on GitHub. Fix merged in #12647 on 19 Apr 2026. Check it covers your case.

The short answer

0open issues
0open PRs
3items grouped
Known?
Yes. 3 related items grouped here, 1 issue already closed.
Fix event
A fix was merged to main in PR #12647. Check it covers your case. No release data is tracked.
Tracker
The maintainers' tracker marks this resolved, deciding PR #12647. That is separate from the fix event.
Still open
Nothing open on GitHub.

A bug where the terminal tool hangs indefinitely when commands launch background child processes, along with multiple fix attempts addressing session and process group handling to prevent the hang.

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.

  • #12647 fix(environments): prevent terminal hang when commands background children (#8340)

    merged to main

    files: tests/tools/test_local_background_child_hang.py, tools/environments/base.py

1 PR closed without merging

From the close comments: partial fix 1

  • #8399 fix(environments/local): #8340 prevent terminal hang by replacing preexec_fn with start_new_session · partial fix → #12647, #8340
Closed issues · 1
  • Closed#8340[Bug]: Terminal tool hangs indefinitely when using setsid + disown pattern to launch background services
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(structural links throughout): every member is connected by structural evidence: shared changed files, or a closing/superseded reference.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 0.67: 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
#12647
Closed issues
1
Attempts
1 PR closed without merging
Fix link checked
19 Apr 2026. This confirmation is old and may be out of date (a revert or reopen would not have invalidated it here); re-verify.

For your agent

The same facts, typed.