FreeBSD: force-remove the jail on exit to reap detached daemons Builds run in a non-persistent jail, which the kernel only auto-removes once its *last* process exits. A build step that detaches a process (e.g. a test running `git daemon --detach`, which reparents to PID 1) leaves a straggler that keeps the jail -- and its devfs mount and ZFS snapshot -- alive indefinitely. The mounts are then held busy, so the manual umounts on the success path fail with EBUSY and are ignored, and the jail leaks. On a long-lived worker these pile up until the host grinds to a halt. Replace the manual umounts with `jail -r`, run on every exit path. It SIGKILLs any straggler so the jail's release actions can unmount devfs and the cache mounts. On a clean exit the jail has already auto-removed, so this is a harmless no-op.