Fix validation run — patched kernel
  DragonFly dfbsd 6.5-DEVELOPMENT #1: Mon Sep  7 10:27:31 UTC 2026
  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64

$ /tmp/rv                  (unprivileged uid=1001, patched kernel #1)
fifo opened: rfd=3 wfd=4 (uid=1001)
revoke(/tmp/df3162_fifo) returned 0 (owner is allowed to revoke)
OK: write after revoke failed: Bad file descriptor     <-- FIXED (fds now revoked; was: data still flowing)
VERDICT: not_reproduced
rv-rc=1
(rc=1 = "bug marker absent" = correct post-fix behavior)