Port of upstream grok-build 1.0.1 (landed upstream 2026-08-06).
A child wedged in an uninterruptible kernel syscall (D-state) never
observes SIGKILL, and a background descendant can hold the output pipes
open past the kill; both previously stalled tool futures without bound.
- kigi-tty-utils: KILL_REAP_TIMEOUT (5s) + reap_killed_bounded — wait
for an already-killed child at most the bound, then abandon the corpse
to tokio's orphan reaper.
- local_terminal: pipe readers share their buffer with the spawner and
join under the reap bound on both exit arms (aborted readers are
awaited so no tail bytes race the take); the whole tree is enrolled in
a ProcessGroup and group-killed on timeout; the timeout arm returns
the synthetic result instead of waiting on the corpse. Grandchild
kill + prompt-return pinned by a ported unix regression test.
- kigi-tools: reap_killed_search_child wrapper; grep's four kill sites
reap bounded; glob's stderr goes to null (an unread pipe blocks rg on
warning backpressure) and its truncation kill reaps bounded.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KSy9S31pZNWXtRZNVJ1sDf
ZacharyZhang-NYandClaude Fable 5
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