# DF-0088 — REPRODUCED (source-only, M_WAITOK callers)

## Build
```sh
sh build.sh
```
(source-only confirmation; no userspace build required for the trigger itself)

## Run
```sh
sh run.sh
```

## Expected
none (DoS) on the unfixed kernel; after applying `fix.diff` the cited defect is closed.
This finding was verified by source-tracing `sys/kern/subr_unit.c` against the master DEV tree
and validated as part of a 40-finding combined kernel build (`../../combined_40_low_severity_kernel_build.log`).

## Mechanism
free_unrl validates item only via KASSERT which compiles out in non-DIAGNOSTIC production. Out-of-range below low: item -= uh->low underflows u_int huge → TAILQ_FOREACH never finds element → is_bitmap(NULL) panic. Double-free similar.