DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #1: Fri Oct  2 13:50:14 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
uid=1001(maxx) gid=1001(maxx) groups=1001(maxx), 5(operator)
crw-rw----  1 root  operator   25, 0x00000000 Oct  2 13:59 /dev/usb/0.2.1
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #1: Fri Oct  2 13:50:14 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
6
 1    5 0xffffffff80200000  1b00528 kernel
 2    1 0xffffffff81d01000    76020 ehci.ko
 3    1 0xffffffff81d78000    85ff0 xhci.ko
114:static void usb_filter_detach_unlink(struct usb_cdev_privdata *,
1253:		usb_filter_detach_unlink(cpd, kn);
1292:usb_filter_detach_unlink(struct usb_cdev_privdata *cpd, struct knote *kn)
--- baseline (unpatched with-src kernel, used for the panicking runs) ---
DragonFly dfbsd 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026
  /usr/src/sys/bus/u4b/usb_dev.c md5 8307905e7ec38912ff7e2883279a187b
  (identical to the audited tree sys/bus/u4b/usb_dev.c)
  kprintf     ffffffff8069d340   filter_event ffffffff8063a630
QEMU: qemu-system-x86_64 -enable-kvm -m 4096 -smp 6
      -device usb-ehci,id=ehci0 -device usb-mouse,bus=ehci0.0
USB:  ugen0.2 <QEMU QEMU USB Mouse> at usbus0 (EHCI, HIGH speed)
      /dev/usb/0.2.1 interrupt-IN, 0660 root:operator, ums.ko unloaded
user: maxx uid=1001, group operator