Terminal::stopping did child.kill() (error ignored) and then a blocking
child.wait() on the actix worker thread. Since the 0.3.11 privilege drop,
sessions run as `demo` and the server had no CAP_KILL, so kill() failed
with EPERM and wait() blocked forever. With two workers, exactly every
other request to :8082 then timed out — 5 days of readiness/liveness
flapping on socktop.io and orphaned restricted-shell/socktop processes
piling up in the pods.
- Signal the session's whole process group (portable-pty setsid()s the
child), not just the shell: a non-interactive bash defers signals while
a foreground command runs, so the old SIGHUP/SIGKILL to the shell alone
orphaned socktop anyway.
- Reap on a dedicated thread: SIGHUP, 2 s grace, SIGKILL, 10 s deadline,
then a blocking wait on that thread only. Signal failures are logged.
- Drop the pty handles before handing off the child.
- kubernetes/03-deployment.yaml: add CAP_KILL (sessions still lose every
cap via setpriv). CI never applies the manifest — it was patched live.
- tests/reaper_tests.rs pins the non-blocking return, process-group kill,
and SIGHUP→SIGKILL escalation.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
jasonwitty