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DF-0165 fix-validation environment (both kernels this session)
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UNPATCHED baseline kernel (#0) -- bug reproduces:
  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

PATCHED single-fix kernel (#1) -- fix validated:
  DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #1: Thu Jul  2 11:16:47 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
  /boot/kernel/kernel sha256 = 9213f61534131ee4720f0eeaa04a588c64b881e94a63fb6185671cebf9fde92b

Compiler:
  cc 8.3 [DragonFly] Release/2019-02-22

Jail default policy (restrictive -- all gated PRISON_CAP_* cleared):
  jail.defaults.allow_raw_sockets: 0     -> PRISON_CAP_NET_RAW_SOCKETS unset
  jail.defaults.vfs_mount_nullfs:  0     -> PRISON_CAP_VFS_MOUNT_NULLFS  unset
  jail.defaults.vfs_mount_tmpfs:   0     -> PRISON_CAP_VFS_MOUNT_TMPFS   unset
  jail.defaults.vfs_mount_devfs:   0     -> PRISON_CAP_VFS_MOUNT_DEVFS   unset
  jail.defaults.vfs_mount_procfs:  0     -> PRISON_CAP_VFS_MOUNT_PROCFS  unset
  vfs.usermount: 0