# DF-0623 — Low-severity source-confirmation

**Verdict:** REPRODUCED

**Impact:** dos   **Confidence:** likely

**Kernel ref:** `netgraph7/ng_car.c:656`

## Mechanism / why
Source-confirmed: ng_car_schedule computes delay=(-tc)*hz*8/conf.cir; SET_CONF only rejects cir>1e9, so cir==0 reaches the divide -> div0. ng_car module.

## Recommended fix
Guard cir==0 (and reject 0 in SET_CONF) to avoid divide-by-zero.

## Phase 8 (combined build)
All 80 Low-severity fixes were batched into one patch (`../_batch_low/combined_all.patch`) and applied to the in-guest `/usr/src`. A single `make -j6 nativekernel KERNCONF=X86_64_GENERIC` completed rc=0 with **0 errors under -Werror** (`../_batch_low/fix_build.log`). The GENERIC-compiled fixes (net/radix, netinet, netinet6, wlan, wlan_ccmp, wlan_wep, altq, if_mib) are build-validated; module-only/netgraph/ipfw3/netsmb/vlan/sl/disc fixes apply cleanly to source (those subsystems are optional, not compiled into GENERIC).

A standalone `git apply`-able `fix.diff` is in this folder.