=== RUN DF-1805 2026-07-20T18:44:52Z ===
after attach: head=0x8004902c0 kn=0x8004902c0 alive=1
after buggy detach (knote_insert): head=0x8004902c0 kn=0x8004902c0 kn->kn_next=0x8004902c0 (self-cycle=1)
after knote_drop: head=0x8004902c0 -> freed kn (alive=0) = DANGLING
after FIXED detach+drop: head=0x0 (clean)
[exit=0]