=== DF-4922 PoC start ===
DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:54 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
 4    1 0xffffffff82600000    14000 dm_target_flakey.ko
--- control: attach/detach vn9 with NO dm load ---
vnconfig: /dev/vn9: No such file or directory
vnconfig: /dev/vn9: No such file or directory
--- baseline M_DM ---
                 dm       4     592       0    390M        8
--- path A: 20 failed loads, 20 distinct pdevs ---
vnconfig: VNIOCATTACH: Device busy
ioctl reload call failed: Invalid argument

Command failed
ioctl reload call failed: Invalid argument

Command failed
ioctl reload call failed: Invalid argument

Command failed
ioctl reload call failed: Invalid argument

Command failed
vnconfig: /dev/vn4: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn5: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn6: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn7: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn8: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn9: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn10: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn11: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn12: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn13: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn14: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn15: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn16: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn17: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn18: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
vnconfig: /dev/vn19: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
M_DM after path A (expect ~+5KB):
                 dm       7   1.33K       0    390M      107
--- cleanup half-created dm devices ---
M_DM after dm device removal (leaked pdevs must persist):
                 dm       7   1.33K       0    390M      107
No devices found
--- path B: unknown feature ---
vnconfig: /dev/vn50: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
load rc=1 (expect EINVAL)
--- path C: interval overflow ---
vnconfig: /dev/vn51: No such file or directory
ioctl reload call failed: No such file or directory

Command failed
load rc=1 (expect EINVAL)
M_DM after paths B+C:
                 dm       7   1.33K       0    390M      117
--- detach attempts: leaked units must be EBUSY ---
RESULT detach: ok=0 busy=22  (expect ok=0 busy=22)
=== DF-4922 PoC end ===