# DF-2633 environment (audit guest, single-tenant QEMU/KVM)

## stock kernel (baseline reproduction)
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
kern.osrevision: 600519
cc 8.3 [DragonFly] Release/2019-02-22
kern.clockrate: { hz = 100, tick = 10000 }
hw.usermem: 3754377216
vCPUs: 6 (KVM), /tmp tmpfs ~975M, root vbd0s1d hammer2

## fix kernel (validation)
DragonFly 6.5-DEVELOPMENT #2: Sat Aug 29 08:00:46 UTC 2026 root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC
= X86_64_GENERIC (identical config) + fix.diff (shared DF-2632+DF-2633 diff)
build: cd /usr/src && make -j6 nativekernel KERNCONF=X86_64_GENERIC && make installkernel KERNCONF=X86_64_GENERIC
(compiled clean under -Werror)

## test filesystems
- /dev/vn1@DATA hammer2 256MB on /mnt/h33 (vn over /tmp tmpfs image —
  reproduces the backend-exhaustion/storm conditions; a vn-over-hammer2
  image behaves differently: no storm, see VERDICT.md)
- control files on the root hammer2 fs (22G free)