{
  "finding_id": "DF-4167",
  "verdict": "reproduced",
  "impact": "dos",
  "confidence": "certain",
  "runner": "df-bsd-reviewer",
  "verified_at": "2026-10-15T21:15:00Z",
  "method": "verbatim-code rig (production parser + production PLL sink math byte-identical, compiled on guest, verified against guest /usr/src/sys)",
  "reproduce": {
    "build": "cd rig && sh ./build.sh /usr/src",
    "run": "cd rig && sh ./run.sh",
    "expected": "baseline: fw-v32-nosmu and fw-v32-smu1 return BP_RESULT_OK with crystal_frequency=0; sink-ssdp-post-smu1 SIGFPE FPE_INTDIV with RIP inside calculate_fb_and_fractional_fb_divider (div_u64 by ref_freq_khz=0, dce_clock_source.c:145); sink-plain-smu1 SIGFPE inside calculate_pixel_clock_pll_dividers (:336 0/0, pre-existing). fixed: nosmu -> BADBIOSTABLE, smu1 -> 27000, sink computes dividers rc=0 no fault."
  },
  "kernel_refs": [
    "sys/dev/drm/amd/display/dc/bios/bios_parser2.c:1229",
    "sys/dev/drm/amd/display/dc/bios/bios_parser2.c:1257",
    "sys/dev/drm/amd/display/dc/bios/bios_parser2.c:1259",
    "sys/dev/drm/amd/display/dc/bios/bios_parser2.c:1187",
    "sys/dev/drm/amd/display/dc/dce/dce_clock_source.c:1159",
    "sys/dev/drm/amd/display/dc/dce/dce_clock_source.c:145",
    "sys/dev/drm/amd/display/dc/dce/dce_clock_source.c:336",
    "sys/dev/drm/amd/display/dc/bios/bios_parser_helper.c:40"
  ],
  "artifacts": [
    "README.md",
    "VERDICT.md",
    "rig/gen_rig.sh",
    "rig/check_verbatim.sh",
    "rig/fw_slice_verbatim.h",
    "rig/fw_slice_verbatim.c",
    "rig/rig_shims.h",
    "rig/fw_rig.c",
    "rig/Makefile",
    "rig/build.sh",
    "rig/run.sh",
    "build.log",
    "run.log",
    "run.2.log",
    "fix_validation.log",
    "code_hashes.txt",
    "env.txt",
    "fix.diff",
    "verdict.json",
    "manifest.json"
  ]
}