# DF-2971 PoC evidence pack

## What
No common lock between linesw[] mutation and dispatch: torn multi-pointer swaps observed at scale.

## Build
```
make (KMOD dfv_safe)
```

## Run
```
kldload dfv_safe.ko; sysctl -w dfv.t2971=1; dmesg | grep DF2971
```

## Expected
197M unlocked snapshots: 3.2M torn (mixed old/new pointer) linesw entries

Guest: DragonFly dfbsd 6.5-DEVELOPMENT DragonFly 6.5-DEVELOPMENT #0: Thu Jul  2 06:02:04 UTC 2026     root@dfbsd:/usr/obj/usr/src/sys/X86_64_GENERIC  x86_64
All logs are full untrimmed captures unless noted. fix.diff is the
git-apply-able verified fix (authored after verification; never applied
to the audit tree).