Guest environment (verification + fix-validation runs)

uname -a (stock baseline kernel):
  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
uname -a (fix-validation kernel):
  DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #1: Thu Oct 15 07:30:39 UTC 2026  root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
kernel config: X86_64_GENERIC, INVARIANTS (KKASSERTs active)
QEMU/KVM: qemu-system-x86_64 -enable-kvm -m 4096 -smp 6, virtio disk+net
root fs: hammer2 (LOCAL pmp), 24.6G
tools: newfs_hammer2 /sbin, hammer2 /sbin, mount_hammer2 /sbin,
  vnconfig /usr/sbin, cc 8.3 [DragonFly], jot/hexdump/md5 in base
cluster rig: vn(4) devices over file images (vnconfig), 256MB images,
  newfs_hammer2 -L tv58; 3-master clusters formed by dd clones sharing the
  newfs pfs_clid, merged via EBUSY mounts (hammer2_pfsalloc appends columns)
sysctl used: vfs.hammer2.debug=1 (baseline trace), 0x8000 (pass tracing),
  debug.debugger_on_panic=0 (panic backtraces + dump + reboot)
crash dumps: /var/crash/vmcore.0 (04:56:37 panic, page fault, backtrace
  captured live instead; dump lost on snapshot revert)