FAILURE MAP
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FA-53041 / Raster memory layout / Open access

Three Luma Ten Bit Words: Ten-bit raster word count drops partial group or assumes four samples · case 01

The returned physical layout descriptor disagrees with the declared buffer mapping at words_per_row.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Ten-bit raster word count drops partial group or assumes four samples The faulty expression is p["w"]//3.

THE FAILURE

Ten-bit raster word count drops partial group or assumes four samples The faulty expression is p["w"]//3.

Unsuccessful approach: The attempted repair uses (p["w"]+3)//4 and still violates the layout contract.

Case contract

A stipulated luma row stores three ten-bit samples in each 32-bit little-endian word. The top two bits are preserved metadata. Each scanline starts with a two-byte exposure tag; final unused lanes are padding. Return the named intermediate layout descriptor and final address fields; all quantities are integer byte offsets unless explicitly stated.

Why this case matters

Offline raster resource, upload, readback, and storage-layout regression model.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(p):
    p = dict(p)
    words_per_row = p["w"]//3
    row_pitch = words_per_row*4+2
    word_column = p["x"]//3
    lane = p["x"]%3
    shift = lane*10
    mask = 1023<<shift
    word_address = p["base"]+p["y"]*row_pitch+2+word_column*4
    updated = (p["word"]&~mask)|((p["value"]&1023)<<shift)
    bytes = [(updated>>(8*i))&255 for i in range(4)]
    valid_tail_lanes = (p["w"]-1)%3+1
    return {'words_per_row': words_per_row, 'row_pitch': row_pitch, 'word_column': word_column, 'lane': lane, 'shift': shift, 'mask': mask, 'word_address': word_address, 'updated': updated, 'bytes': bytes, 'valid_tail_lanes': valid_tail_lanes}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [({'w': 6, 'h': 2, 'x': 0, 'y': 0, 'base': 7, 'value': 31, 'word': 3240314215}, {'words_per_row': 2, 'row_pitch': 10, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 9, 'updated': 3240313887, 'bytes': [31, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 7, 'h': 3, 'x': 1, 'y': 1, 'base': 7, 'value': 32, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 23, 'updated': 3240132967, 'bytes': [103, 129, 32, 193], 'valid_tail_lanes': 1}), ({'w': 8, 'h': 4, 'x': 2, 'y': 2, 'base': 7, 'value': 33, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 37, 'updated': 3256042855, 'bytes': [103, 69, 19, 194], 'valid_tail_lanes': 2}), ({'w': 9, 'h': 5, 'x': 3, 'y': 3, 'base': 7, 'value': 34, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 55, 'updated': 3240313890, 'bytes': [34, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 6, 'x': 4, 'y': 4, 'base': 7, 'value': 35, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 85, 'updated': 3240136039, 'bytes': [103, 141, 32, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 7, 'x': 5, 'y': 5, 'base': 7, 'value': 36, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 103, 'updated': 3259188583, 'bytes': [103, 69, 67, 194], 'valid_tail_lanes': 2})], 2: [({'w': 7, 'h': 2, 'x': 0, 'y': 0, 'base': 14, 'value': 62, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 16, 'updated': 3240313918, 'bytes': [62, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 8, 'h': 3, 'x': 1, 'y': 1, 'base': 14, 'value': 63, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 30, 'updated': 3240164711, 'bytes': [103, 253, 32, 193], 'valid_tail_lanes': 2}), ({'w': 9, 'h': 4, 'x': 2, 'y': 2, 'base': 14, 'value': 64, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 44, 'updated': 3288548711, 'bytes': [103, 69, 3, 196], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 5, 'x': 3, 'y': 3, 'base': 14, 'value': 65, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 74, 'updated': 3240313921, 'bytes': [65, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 6, 'x': 4, 'y': 4, 'base': 14, 'value': 66, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 92, 'updated': 3240167783, 'bytes': [103, 9, 33, 193], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 7, 'x': 5, 'y': 5, 'base': 14, 'value': 67, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 110, 'updated': 3291694439, 'bytes': [103, 69, 51, 196], 'valid_tail_lanes': 3})], 3: [({'w': 8, 'h': 2, 'x': 0, 'y': 0, 'base': 21, 'value': 93, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 23, 'updated': 3240313949, 'bytes': [93, 68, 35, 193], 'valid_tail_lanes': 2}), ({'w': 9, 'h': 3, 'x': 1, 'y': 1, 'base': 21, 'value': 94, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 37, 'updated': 3240196455, 'bytes': [103, 121, 33, 193], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 4, 'x': 2, 'y': 2, 'base': 21, 'value': 95, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 59, 'updated': 3321054567, 'bytes': [103, 69, 243, 197], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 5, 'x': 3, 'y': 3, 'base': 21, 'value': 96, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 81, 'updated': 3240313952, 'bytes': [96, 68, 35, 193], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 6, 'x': 4, 'y': 4, 'base': 21, 'value': 97, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 99, 'updated': 3240199527, 'bytes': [103, 133, 33, 193], 'valid_tail_lanes': 3}), ({'w': 13, 'h': 7, 'x': 5, 'y': 5, 'base': 21, 'value': 98, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 137, 'updated': 3324200295, 'bytes': [103, 69, 35, 198], 'valid_tail_lanes': 1})], 4: [({'w': 9, 'h': 2, 'x': 0, 'y': 0, 'base': 28, 'value': 124, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 30, 'updated': 3240313980, 'bytes': [124, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 3, 'x': 1, 'y': 1, 'base': 28, 'value': 125, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 48, 'updated': 3240228199, 'bytes': [103, 245, 33, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 4, 'x': 2, 'y': 2, 'base': 28, 'value': 126, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 66, 'updated': 3353560423, 'bytes': [103, 69, 227, 199], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 5, 'x': 3, 'y': 3, 'base': 28, 'value': 127, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 88, 'updated': 3240313983, 'bytes': [127, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 13, 'h': 6, 'x': 4, 'y': 4, 'base': 28, 'value': 128, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 122, 'updated': 3240231271, 'bytes': [103, 1, 34, 193], 'valid_tail_lanes': 1}), ({'w': 14, 'h': 7, 'x': 5, 'y': 5, 'base': 28, 'value': 129, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 144, 'updated': 3356706151, 'bytes': [103, 69, 19, 200], 'valid_tail_lanes': 2})], 5: [({'w': 10, 'h': 2, 'x': 0, 'y': 0, 'base': 35, 'value': 155, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 37, 'updated': 3240314011, 'bytes': [155, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 3, 'x': 1, 'y': 1, 'base': 35, 'value': 156, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 55, 'updated': 3240259943, 'bytes': [103, 113, 34, 193], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 4, 'x': 2, 'y': 2, 'base': 35, 'value': 157, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 73, 'updated': 3386066279, 'bytes': [103, 69, 211, 201], 'valid_tail_lanes': 3}), ({'w': 13, 'h': 5, 'x': 3, 'y': 3, 'base': 35, 'value': 158, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 107, 'updated': 3240314014, 'bytes': [158, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 14, 'h': 6, 'x': 4, 'y': 4, 'base': 35, 'value': 159, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 129, 'updated': 3240263015, 'bytes': [103, 125, 34, 193], 'valid_tail_lanes': 2}), ({'w': 15, 'h': 7, 'x': 5, 'y': 5, 'base': 35, 'value': 160, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 151, 'updated': 3389212007, 'bytes': [103, 69, 3, 202], 'valid_tail_lanes': 3})]}
for i, (p, expected) in enumerate(cases[N]):
    check("layout fixture " + str(i + 1), solve(p), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
layout fixture 1{'bytes': [31, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 10, 'shift': 0, 'updated': 3240313887, 'valid_tail_lanes': 3, 'word_address': 9, 'word_column': 0, 'words_per_row': 2}{'bytes': [31, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 10, 'shift': 0, 'updated': 3240313887, 'valid_tail_lanes': 3, 'word_address': 9, 'word_column': 0, 'words_per_row': 2}Passed
layout fixture 2{'bytes': [103, 129, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 10, 'shift': 10, 'updated': 3240132967, 'valid_tail_lanes': 1, 'word_address': 19, 'word_column': 0, 'words_per_row': 2}{'bytes': [103, 129, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 14, 'shift': 10, 'updated': 3240132967, 'valid_tail_lanes': 1, 'word_address': 23, 'word_column': 0, 'words_per_row': 3}Failed
layout fixture 3{'bytes': [103, 69, 19, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 10, 'shift': 20, 'updated': 3256042855, 'valid_tail_lanes': 2, 'word_address': 29, 'word_column': 0, 'words_per_row': 2}{'bytes': [103, 69, 19, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 14, 'shift': 20, 'updated': 3256042855, 'valid_tail_lanes': 2, 'word_address': 37, 'word_column': 0, 'words_per_row': 3}Failed
layout fixture 4{'bytes': [34, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 14, 'shift': 0, 'updated': 3240313890, 'valid_tail_lanes': 3, 'word_address': 55, 'word_column': 1, 'words_per_row': 3}{'bytes': [34, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 14, 'shift': 0, 'updated': 3240313890, 'valid_tail_lanes': 3, 'word_address': 55, 'word_column': 1, 'words_per_row': 3}Passed
layout fixture 5{'bytes': [103, 141, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 14, 'shift': 10, 'updated': 3240136039, 'valid_tail_lanes': 1, 'word_address': 69, 'word_column': 1, 'words_per_row': 3}{'bytes': [103, 141, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 18, 'shift': 10, 'updated': 3240136039, 'valid_tail_lanes': 1, 'word_address': 85, 'word_column': 1, 'words_per_row': 4}Failed
layout fixture 6{'bytes': [103, 69, 67, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 14, 'shift': 20, 'updated': 3259188583, 'valid_tail_lanes': 2, 'word_address': 83, 'word_column': 1, 'words_per_row': 3}{'bytes': [103, 69, 67, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 18, 'shift': 20, 'updated': 3259188583, 'valid_tail_lanes': 2, 'word_address': 103, 'word_column': 1, 'words_per_row': 4}Failed

SHA-256 / df4948bade5fa3be201c84c744363c0ea58f07f7c1e12204aac0dc3ca753a221

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(p):
    p = dict(p)
    words_per_row = (p["w"]+3)//4
    row_pitch = words_per_row*4+2
    word_column = p["x"]//3
    lane = p["x"]%3
    shift = lane*10
    mask = 1023<<shift
    word_address = p["base"]+p["y"]*row_pitch+2+word_column*4
    updated = (p["word"]&~mask)|((p["value"]&1023)<<shift)
    bytes = [(updated>>(8*i))&255 for i in range(4)]
    valid_tail_lanes = (p["w"]-1)%3+1
    return {'words_per_row': words_per_row, 'row_pitch': row_pitch, 'word_column': word_column, 'lane': lane, 'shift': shift, 'mask': mask, 'word_address': word_address, 'updated': updated, 'bytes': bytes, 'valid_tail_lanes': valid_tail_lanes}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
cases = {1: [({'w': 6, 'h': 2, 'x': 0, 'y': 0, 'base': 7, 'value': 31, 'word': 3240314215}, {'words_per_row': 2, 'row_pitch': 10, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 9, 'updated': 3240313887, 'bytes': [31, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 7, 'h': 3, 'x': 1, 'y': 1, 'base': 7, 'value': 32, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 23, 'updated': 3240132967, 'bytes': [103, 129, 32, 193], 'valid_tail_lanes': 1}), ({'w': 8, 'h': 4, 'x': 2, 'y': 2, 'base': 7, 'value': 33, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 37, 'updated': 3256042855, 'bytes': [103, 69, 19, 194], 'valid_tail_lanes': 2}), ({'w': 9, 'h': 5, 'x': 3, 'y': 3, 'base': 7, 'value': 34, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 55, 'updated': 3240313890, 'bytes': [34, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 6, 'x': 4, 'y': 4, 'base': 7, 'value': 35, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 85, 'updated': 3240136039, 'bytes': [103, 141, 32, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 7, 'x': 5, 'y': 5, 'base': 7, 'value': 36, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 103, 'updated': 3259188583, 'bytes': [103, 69, 67, 194], 'valid_tail_lanes': 2})], 2: [({'w': 7, 'h': 2, 'x': 0, 'y': 0, 'base': 14, 'value': 62, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 16, 'updated': 3240313918, 'bytes': [62, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 8, 'h': 3, 'x': 1, 'y': 1, 'base': 14, 'value': 63, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 30, 'updated': 3240164711, 'bytes': [103, 253, 32, 193], 'valid_tail_lanes': 2}), ({'w': 9, 'h': 4, 'x': 2, 'y': 2, 'base': 14, 'value': 64, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 44, 'updated': 3288548711, 'bytes': [103, 69, 3, 196], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 5, 'x': 3, 'y': 3, 'base': 14, 'value': 65, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 74, 'updated': 3240313921, 'bytes': [65, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 6, 'x': 4, 'y': 4, 'base': 14, 'value': 66, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 92, 'updated': 3240167783, 'bytes': [103, 9, 33, 193], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 7, 'x': 5, 'y': 5, 'base': 14, 'value': 67, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 110, 'updated': 3291694439, 'bytes': [103, 69, 51, 196], 'valid_tail_lanes': 3})], 3: [({'w': 8, 'h': 2, 'x': 0, 'y': 0, 'base': 21, 'value': 93, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 23, 'updated': 3240313949, 'bytes': [93, 68, 35, 193], 'valid_tail_lanes': 2}), ({'w': 9, 'h': 3, 'x': 1, 'y': 1, 'base': 21, 'value': 94, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 37, 'updated': 3240196455, 'bytes': [103, 121, 33, 193], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 4, 'x': 2, 'y': 2, 'base': 21, 'value': 95, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 59, 'updated': 3321054567, 'bytes': [103, 69, 243, 197], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 5, 'x': 3, 'y': 3, 'base': 21, 'value': 96, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 81, 'updated': 3240313952, 'bytes': [96, 68, 35, 193], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 6, 'x': 4, 'y': 4, 'base': 21, 'value': 97, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 99, 'updated': 3240199527, 'bytes': [103, 133, 33, 193], 'valid_tail_lanes': 3}), ({'w': 13, 'h': 7, 'x': 5, 'y': 5, 'base': 21, 'value': 98, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 137, 'updated': 3324200295, 'bytes': [103, 69, 35, 198], 'valid_tail_lanes': 1})], 4: [({'w': 9, 'h': 2, 'x': 0, 'y': 0, 'base': 28, 'value': 124, 'word': 3240314215}, {'words_per_row': 3, 'row_pitch': 14, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 30, 'updated': 3240313980, 'bytes': [124, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 10, 'h': 3, 'x': 1, 'y': 1, 'base': 28, 'value': 125, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 48, 'updated': 3240228199, 'bytes': [103, 245, 33, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 4, 'x': 2, 'y': 2, 'base': 28, 'value': 126, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 66, 'updated': 3353560423, 'bytes': [103, 69, 227, 199], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 5, 'x': 3, 'y': 3, 'base': 28, 'value': 127, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 88, 'updated': 3240313983, 'bytes': [127, 68, 35, 193], 'valid_tail_lanes': 3}), ({'w': 13, 'h': 6, 'x': 4, 'y': 4, 'base': 28, 'value': 128, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 122, 'updated': 3240231271, 'bytes': [103, 1, 34, 193], 'valid_tail_lanes': 1}), ({'w': 14, 'h': 7, 'x': 5, 'y': 5, 'base': 28, 'value': 129, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 144, 'updated': 3356706151, 'bytes': [103, 69, 19, 200], 'valid_tail_lanes': 2})], 5: [({'w': 10, 'h': 2, 'x': 0, 'y': 0, 'base': 35, 'value': 155, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 37, 'updated': 3240314011, 'bytes': [155, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 11, 'h': 3, 'x': 1, 'y': 1, 'base': 35, 'value': 156, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 55, 'updated': 3240259943, 'bytes': [103, 113, 34, 193], 'valid_tail_lanes': 2}), ({'w': 12, 'h': 4, 'x': 2, 'y': 2, 'base': 35, 'value': 157, 'word': 3240314215}, {'words_per_row': 4, 'row_pitch': 18, 'word_column': 0, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 73, 'updated': 3386066279, 'bytes': [103, 69, 211, 201], 'valid_tail_lanes': 3}), ({'w': 13, 'h': 5, 'x': 3, 'y': 3, 'base': 35, 'value': 158, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 0, 'shift': 0, 'mask': 1023, 'word_address': 107, 'updated': 3240314014, 'bytes': [158, 68, 35, 193], 'valid_tail_lanes': 1}), ({'w': 14, 'h': 6, 'x': 4, 'y': 4, 'base': 35, 'value': 159, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 1, 'shift': 10, 'mask': 1047552, 'word_address': 129, 'updated': 3240263015, 'bytes': [103, 125, 34, 193], 'valid_tail_lanes': 2}), ({'w': 15, 'h': 7, 'x': 5, 'y': 5, 'base': 35, 'value': 160, 'word': 3240314215}, {'words_per_row': 5, 'row_pitch': 22, 'word_column': 1, 'lane': 2, 'shift': 20, 'mask': 1072693248, 'word_address': 151, 'updated': 3389212007, 'bytes': [103, 69, 3, 202], 'valid_tail_lanes': 3})]}
for i, (p, expected) in enumerate(cases[N]):
    check("layout fixture " + str(i + 1), solve(p), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
layout fixture 1{'bytes': [31, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 10, 'shift': 0, 'updated': 3240313887, 'valid_tail_lanes': 3, 'word_address': 9, 'word_column': 0, 'words_per_row': 2}{'bytes': [31, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 10, 'shift': 0, 'updated': 3240313887, 'valid_tail_lanes': 3, 'word_address': 9, 'word_column': 0, 'words_per_row': 2}Passed
layout fixture 2{'bytes': [103, 129, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 10, 'shift': 10, 'updated': 3240132967, 'valid_tail_lanes': 1, 'word_address': 19, 'word_column': 0, 'words_per_row': 2}{'bytes': [103, 129, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 14, 'shift': 10, 'updated': 3240132967, 'valid_tail_lanes': 1, 'word_address': 23, 'word_column': 0, 'words_per_row': 3}Failed
layout fixture 3{'bytes': [103, 69, 19, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 10, 'shift': 20, 'updated': 3256042855, 'valid_tail_lanes': 2, 'word_address': 29, 'word_column': 0, 'words_per_row': 2}{'bytes': [103, 69, 19, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 14, 'shift': 20, 'updated': 3256042855, 'valid_tail_lanes': 2, 'word_address': 37, 'word_column': 0, 'words_per_row': 3}Failed
layout fixture 4{'bytes': [34, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 14, 'shift': 0, 'updated': 3240313890, 'valid_tail_lanes': 3, 'word_address': 55, 'word_column': 1, 'words_per_row': 3}{'bytes': [34, 68, 35, 193], 'lane': 0, 'mask': 1023, 'row_pitch': 14, 'shift': 0, 'updated': 3240313890, 'valid_tail_lanes': 3, 'word_address': 55, 'word_column': 1, 'words_per_row': 3}Passed
layout fixture 5{'bytes': [103, 141, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 14, 'shift': 10, 'updated': 3240136039, 'valid_tail_lanes': 1, 'word_address': 69, 'word_column': 1, 'words_per_row': 3}{'bytes': [103, 141, 32, 193], 'lane': 1, 'mask': 1047552, 'row_pitch': 18, 'shift': 10, 'updated': 3240136039, 'valid_tail_lanes': 1, 'word_address': 85, 'word_column': 1, 'words_per_row': 4}Failed
layout fixture 6{'bytes': [103, 69, 67, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 14, 'shift': 20, 'updated': 3259188583, 'valid_tail_lanes': 2, 'word_address': 83, 'word_column': 1, 'words_per_row': 3}{'bytes': [103, 69, 67, 194], 'lane': 2, 'mask': 1072693248, 'row_pitch': 18, 'shift': 20, 'updated': 3259188583, 'valid_tail_lanes': 2, 'word_address': 103, 'word_column': 1, 'words_per_row': 4}Failed

SHA-256 / e1ff0b910382b2795ce713971925ccd7a8c613eff7a73e163ac56efccbfae828

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 6 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

Stipulated deterministic toy buffer layout; not a graphics API, codec, GPU vendor tiling specification, or hardware-conformance claim. Inputs satisfy the dimensions and bounds stated by the model. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:45:35.518919+00:00.

Case digest / 69070baf077f6c73c78c6b0279ac76dd5355ef4404619cc7a0e297e612cc1b03