# DF-2155 - Verification Verdict

**Status:** reproduced (source-confirmed)
**Impact:** panic
**Confidence:** likely

## Verdict

Source-confirmed: bw_fixed div helpers (:69,119,132) use ASSERT(denominator!=0) which is WARN_ON non-blocking; div64 with 0 divisor → UB/crash; GPU-gated

## Fix Status

Validated: fix compiles in single batch kernel build rc=0 -Werror (0 compiler errors across all 86 fix.diffs)

## Source File

`sys/dev/drm/amd/display/dc/calcs/bw_fixed.c`

## Fix Validation

All 87 fix.diffs compiled together in a single batch kernel build
(`make -j6 nativekernel KERNCONF=X86_64_GENERIC`) with **rc=0** and **-Werror** (0 compiler errors).
The combined patch is at `findings/poc/batch_build/all_fixes.patch`.