# stock kernel (ng_tty loaded, NETGRAPHDISC=6 live):
DF2970: linesw[6] (NETGRAPHDISC) live l_open=0xffffffff82800a70
DF2970: ldisc_register(6, fake) -> slot=6 SILENTLY ACCEPTED (no occupied-slot check); new l_open=0xffffffff827f4000
DF2970: ldisc_deregister(6) returned void while a tty is OPEN on disc 6 (no use-count gate); linesw[6].l_open now 0xffffffff806b88b0 (nodisc)
DF2970: fake counts: l_open=1 l_close=0 (discipline was deregistered while in use => its l_close never ran; per-tty softc never released)
DF2970: restored linesw[6] l_open=0xffffffff82800a70