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DF-0074 fix validation — re-run on the PATCHED single-fix kernel
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Kernel: DragonFly 6.5-DEVELOPMENT #1: Sat Jul  4 16:48:34 UTC 2026
        sha256(/boot/kernel/kernel) = 58d7f052637e8b048f6b8edd7c9be7e66f5d6b26a7067a6d435856bc237716cd
        (built from with-src baseline + fix.diff applied; only subr_diskslice.c changed)

$ vnconfig -c vn0 /home/maxx/poc/DF-0074/overflow.img
$ ls /dev/vn0*  (kernel auto-probed the 130-entry GPT -> vn0s0..vn0s16 created, dss_nslices=130)

--- single trigger ---
$ /home/maxx/poc/DF-0074/trigger /dev/vn0s1
DIOCGSLICEINFO returned nslices=130                       <-- live count preserved (regression-free)
rc=0

--- stress: 10 iters (ioctl + slab churn) ---
[9] DIOCGSLICEINFO returned nslices=130 (overflow happened)
fork/exit churn to force fdfree slab validation...
stress done; if we got here, no synchronous panic this run.
stress_rc=0

--- 32-proc parallel flood, 3 rounds = 96 concurrent DIOCGSLICEINFO ---
flood done (96 triggers)

--- final stress: 20 iters ---
fork/exit churn to force fdfree slab validation...
stress done; if we got here, no synchronous panic this run.
stress2_rc=0

$ date
Sat Jul  4 16:54:59 UTC 2026

$ vm.sh status => up
$ dmesg | tail => no slab warnings, no panic signature

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RESULT: NO panic, NO slab corruption, guest stays up. Fix closes the bug.
        Compare baseline #0: identical workload (5 stress iters + 16-proc flood)
        panicked at _kmalloc+0x44a (corrupted zone), guest down.
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