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FA-50746 / Raster clipping / Open access

Deferred draw clip: queue overwrite · case 01

A second deferred draw overwrites the first pending submission.

Verified by executionVariant 1 · 16 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

A second deferred draw overwrites the first pending submission.

THE FAILURE

A second deferred draw overwrites the first pending submission.

Unsuccessful approach: Deduplicating by draw ID drops earlier distinct submissions carrying the same ID.

Case contract

Submission captures coverage, enabled state and clip polarity at enqueue time. Flush emits queued draw samples in order and consumes the queue. Cancel removes matching draw IDs. Barrier flushes but does not reset clip state. A target resize clips queued samples to the new extent without expanding old snapshots.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

1 / The failure

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

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    clip=set(full)
    enabled=True
    inverted=False
    queue=[]
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='clip': clip=set(cmd[1]) & full
        elif op=='enable': enabled=cmd[1]
        elif op=='invert': inverted=cmd[1]
        elif op=='submit':
            effective=(full-clip if inverted else clip) if enabled else full
            queue=[(cmd[1],set(cmd[2]) & effective)]
        elif op=='cancel': queue=[(k,v) for k,v in queue if k!=cmd[1]]
        elif op=='resize':
            full=set(range(cmd[1]))
            clip &= full
            queue=[(k,v & full) for k,v in queue]
        elif op in ('flush','barrier'):
            out.extend([[k,sorted(v)] for k,v in queue])
            queue=[]
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 4), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 4), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 4), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 4), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 4), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 4), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 4), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 4), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 4), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 4), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 4), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 4), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 4), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 4), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 4), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 4), [['a', [0, 1, 2, 3]]])
if N == 2:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 5), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 5), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 5), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 5), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 5), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 5), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 5), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 5), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 5), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 5), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 5), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 5), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 5), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 5), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 5), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 5), [['a', [0, 1, 2, 3, 4]]])
if N == 3:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 6), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 6), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 6), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 6), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 6), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 6), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 6), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 6), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 6), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 6), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 6), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 6), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 6), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 6), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 6), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 6), [['a', [0, 1, 2, 3, 4, 5]]])
if N == 4:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 7), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 7), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 7), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 7), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 7), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 7), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 7), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 7), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 7), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 7), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 7), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 7), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 7), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 7), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 7), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 7), [['a', [0, 1, 2, 3, 4, 5, 6]]])
if N == 5:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 8), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 8), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 8), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 8), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 8), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 8), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 8), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 8), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 8), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 8), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 8), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 8), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 8), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 8), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 8), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 8), [['a', [0, 1, 2, 3, 4, 5, 6, 7]]])
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
explicit sequence 0[['a', [0, 1]]][['a', [0, 1]]]Passed
explicit sequence 1[['a', [0, 1]]][['a', [0, 1]]]Passed
explicit sequence 2[['a', [1]]][['a', [1]]]Passed
explicit sequence 3[['b', [1]]][['a', [0]], ['b', [1]]]Failed
explicit sequence 4[['b', [1]]][['b', [1]]]Passed
explicit sequence 5[['a', [0]]][['a', [0]]]Passed
explicit sequence 6[['a', [0]]][['a', [0]]]Passed
explicit sequence 7[['a', [0]]][['a', [0]]]Passed
explicit sequence 8[['a', [0]], ['b', [1]]][['a', [0]], ['b', [1]]]Passed
explicit sequence 9[['e', []]][['e', []]]Passed
explicit sequence 10[['a', [1]]][['a', [0]], ['a', [1]]]Failed
explicit sequence 11[][]Passed
explicit sequence 12[['a', []]][['a', []]]Passed
explicit sequence 13[['a', []]][['a', []]]Passed
explicit sequence 14[['a', [1]]][['z', [0]], ['a', [1]]]Failed
explicit sequence 15[['a', [0, 1, 2, 3]]][['a', [0, 1, 2, 3]]]Passed

SHA-256 / 67dbf68192983961e4dc16d273377bcd38180cb01046224b9edb9dd50c50f55c

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(commands, size):
    full=set(range(size))
    clip=set(full)
    enabled=True
    inverted=False
    queue=[]
    out=[]
    for cmd in commands:
        op=cmd[0]
        if op=='clip': clip=set(cmd[1]) & full
        elif op=='enable': enabled=cmd[1]
        elif op=='invert': inverted=cmd[1]
        elif op=='submit':
            effective=(full-clip if inverted else clip) if enabled else full
            queue=[q for q in queue if q[0]!=cmd[1]]+[(cmd[1],set(cmd[2]) & effective)]
        elif op=='cancel': queue=[(k,v) for k,v in queue if k!=cmd[1]]
        elif op=='resize':
            full=set(range(cmd[1]))
            clip &= full
            queue=[(k,v & full) for k,v in queue]
        elif op in ('flush','barrier'):
            out.extend([[k,sorted(v)] for k,v in queue])
            queue=[]
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 4), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 4), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 4), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 4), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 4), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 4), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 4), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 4), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 4), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 4), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 4), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 4), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 4), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 4), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 4), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 4), [['a', [0, 1, 2, 3]]])
if N == 2:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 5), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 5), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 5), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 5), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 5), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 5), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 5), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 5), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 5), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 5), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 5), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 5), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 5), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 5), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 5), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 5), [['a', [0, 1, 2, 3, 4]]])
if N == 3:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 6), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 6), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 6), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 6), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 6), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 6), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 6), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 6), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 6), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 6), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 6), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 6), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 6), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 6), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 6), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 6), [['a', [0, 1, 2, 3, 4, 5]]])
if N == 4:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 7), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 7), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 7), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 7), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 7), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 7), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 7), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 7), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 7), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 7), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 7), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 7), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 7), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 7), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 7), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 7), [['a', [0, 1, 2, 3, 4, 5, 6]]])
if N == 5:
    check('explicit sequence 0', solve([['clip', [0, 1]], ['submit', 'a', [0, 1]], ['clip', [2]], ['flush']], 8), [['a', [0, 1]]])
    check('explicit sequence 1', solve([['clip', [0]], ['enable', False], ['submit', 'a', [0, 1]], ['flush']], 8), [['a', [0, 1]]])
    check('explicit sequence 2', solve([['clip', [0]], ['invert', True], ['submit', 'a', [0, 1]], ['flush']], 8), [['a', [1]]])
    check('explicit sequence 3', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['flush']], 8), [['a', [0]], ['b', [1]]])
    check('explicit sequence 4', solve([['submit', 'a', [0]], ['submit', 'b', [1]], ['cancel', 'a'], ['flush']], 8), [['b', [1]]])
    check('explicit sequence 5', solve([['submit', 'a', [0, 3]], ['resize', 2], ['flush']], 8), [['a', [0]]])
    check('explicit sequence 6', solve([['clip', [0]], ['resize', 3], ['submit', 'a', [0, 1]], ['flush']], 8), [['a', [0]]])
    check('explicit sequence 7', solve([['submit', 'a', [0]], ['flush'], ['flush']], 8), [['a', [0]]])
    check('explicit sequence 8', solve([['submit', 'a', [0]], ['barrier'], ['cancel', 'a'], ['submit', 'b', [1]], ['flush']], 8), [['a', [0]], ['b', [1]]])
    check('explicit sequence 9', solve([['clip', []], ['submit', 'e', [0]], ['flush']], 8), [['e', []]])
    check('explicit sequence 10', solve([['submit', 'a', [0]], ['submit', 'a', [1]], ['flush']], 8), [['a', [0]], ['a', [1]]])
    check('explicit sequence 11', solve([['clip', []], ['submit', 'a', [0]], ['cancel', 'a'], ['flush']], 8), [])
    check('explicit sequence 12', solve([['submit', 'a', [3]], ['resize', 2], ['flush']], 8), [['a', []]])
    check('explicit sequence 13', solve([['clip', [3]], ['resize', 2], ['submit', 'a', [0]], ['flush']], 8), [['a', []]])
    check('explicit sequence 14', solve([['submit', 'z', [0]], ['submit', 'a', [1]], ['flush']], 8), [['z', [0]], ['a', [1]]])
    check('explicit sequence 15', solve([['submit', 'a', [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]], ['flush']], 8), [['a', [0, 1, 2, 3, 4, 5, 6, 7]]])
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
explicit sequence 0[['a', [0, 1]]][['a', [0, 1]]]Passed
explicit sequence 1[['a', [0, 1]]][['a', [0, 1]]]Passed
explicit sequence 2[['a', [1]]][['a', [1]]]Passed
explicit sequence 3[['a', [0]], ['b', [1]]][['a', [0]], ['b', [1]]]Passed
explicit sequence 4[['b', [1]]][['b', [1]]]Passed
explicit sequence 5[['a', [0]]][['a', [0]]]Passed
explicit sequence 6[['a', [0]]][['a', [0]]]Passed
explicit sequence 7[['a', [0]]][['a', [0]]]Passed
explicit sequence 8[['a', [0]], ['b', [1]]][['a', [0]], ['b', [1]]]Passed
explicit sequence 9[['e', []]][['e', []]]Passed
explicit sequence 10[['a', [1]]][['a', [0]], ['a', [1]]]Failed
explicit sequence 11[][]Passed
explicit sequence 12[['a', []]][['a', []]]Passed
explicit sequence 13[['a', []]][['a', []]]Passed
explicit sequence 14[['z', [0]], ['a', [1]]][['z', [0]], ['a', [1]]]Passed
explicit sequence 15[['a', [0, 1, 2, 3]]][['a', [0, 1, 2, 3]]]Passed

SHA-256 / 19e868dcb30a8e59052686253d88ae5e3e56816d8d722d5c48a169f72caca33a

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 16 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

Finite one-dimensional integer sample sets model coverage state only; no geometric intersection, memory layout, GPU or graphics-standard conformance is claimed. 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 2026-09-29T14:45:12.330332+00:00.

Case digest / 98bdb14911ec4cf5ac52a2bf2ddae84535b2c6b34c169933a75b89430475c580