Guest: DragonFly dfbsd 6.5-DEVELOPMENT x86_64 (QEMU/KVM, dfbsd-qemu/vm.sh)
Stock kernel (#0, Jul 2 2026): X86_64_GENERIC WITH INVARIANTS (baseline runs)
Fix kernel     (#1, Oct 12 15:27:54 2026): same + fix.diff
Root fs: hammer2; vfs.usermount = 0 (mounts done as root; with
vfs.usermount=1 + owned vnode device, unpriv-mountable per threat model)
Toolchain: host python3 forger; guest newfs_hammer2, vnconfig(4), cc.