FAILURE MAP
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FA-56401 / Auction allocation rules / Open access

Amendment priority: filled floor · case 01

An amendment retroactively deletes executed units.

Verified by executionVariant 1 · 10 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

An amendment retroactively deletes executed units.

VERIFIED REPAIR

Clamp accepted total to filled quantity, not the old requested total.

Unsuccessful approach: The attempted repair uses x["total"] if x["new_total"]<x["filled"] else x["new_total"]; the explicit regression cases demonstrate that this still violates the stipulated auction rule.

Case contract

A single auction order amendment tracks filled units, original queue stamp and an incoming replacement. Price change or size increase loses queue priority; reducing total size cannot erase existing fills. A cancel acknowledgment terminates remaining quantity. Integer stamps and quantities are nonnegative. Named decision filled-floor: Clamp accepted total to filled quantity, not the old requested total.

Why this case matters

Offline administrative auction model for software failure analysis.

1 / The failure

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

N = 1
observations = []
def solve(x):
    v0 = x["now"] if x["new_total"]>x["total"] else x["stamp"]
    v1 = x["now"] if x["new_price"]!=x["old_price"] else x["stamp"]
    v2 = x["new_total"]
    v3 = max(0,x["new_total"]-x["filled"])
    v4 = 0 if x["cancel"] and x["ack"] else max(0,x["total"]-x["filled"])
    v5 = x["expected"]==x["revision"]
    v6 = x["old_lot"]==x["new_lot"]
    v7 = x["old_owner"]==x["new_owner"]
    v8 = not x["frozen"] or (x["new_price"]==x["old_price"] and x["new_total"]<=x["total"])
    v9 = x["revision"] if x["request_id"]==x["last_id"] else x["revision"]+1
    return {'increase-priority':v0,'price-priority':v1,'filled-floor':v2,'remaining-recalculation':v3,'cancel-ack-gate':v4,'revision-compare':v5,'lot-immutability':v6,'owner-immutability':v7,'freeze-restriction':v8,'request-replay':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('below executed size', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [3, 6, 9, 12, 15]), ('lower price / below executed size', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [3, 6, 9, 12, 15]), ('normal contract', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('lower price', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('unrelated acknowledgment', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('future revision', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 3, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('no collateral held', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 0, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('price replacement', {'old_price': 10, 'new_price': 12, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('size increase', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 12, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [12, 24, 36, 48, 60]), ('acknowledged cancel', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': True, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30])]
def vary(value):
 if type(value) is int: return value*N
 if isinstance(value,list): return [vary(v) for v in value]
 if isinstance(value,dict): return {k:(v if k in ['count', 'delivery_index', 'disputed', 'maximum_set', 'minimum_set', 'stage', 'threshold', 'waived'] else vary(v)) for k,v in value.items()}
 return value
for label, request, expected in fixtures:
 check(label, solve(vary(request))['filled-floor'], expected[N-1])
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
below executed size23Failed
lower price / below executed size23Failed
normal contract66Passed
lower price66Passed
unrelated acknowledgment66Passed
future revision66Passed
no collateral held66Passed
price replacement66Passed
size increase1212Passed
acknowledged cancel66Passed

SHA-256 / 1f620f4e79ad4da1f810aa11a6ecc23328a8ff16195e4d83511d377815e76663

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(x):
    v0 = x["now"] if x["new_total"]>x["total"] else x["stamp"]
    v1 = x["now"] if x["new_price"]!=x["old_price"] else x["stamp"]
    v2 = x["total"] if x["new_total"]<x["filled"] else x["new_total"]
    v3 = max(0,x["new_total"]-x["filled"])
    v4 = 0 if x["cancel"] and x["ack"] else max(0,x["total"]-x["filled"])
    v5 = x["expected"]==x["revision"]
    v6 = x["old_lot"]==x["new_lot"]
    v7 = x["old_owner"]==x["new_owner"]
    v8 = not x["frozen"] or (x["new_price"]==x["old_price"] and x["new_total"]<=x["total"])
    v9 = x["revision"] if x["request_id"]==x["last_id"] else x["revision"]+1
    return {'increase-priority':v0,'price-priority':v1,'filled-floor':v2,'remaining-recalculation':v3,'cancel-ack-gate':v4,'revision-compare':v5,'lot-immutability':v6,'owner-immutability':v7,'freeze-restriction':v8,'request-replay':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('below executed size', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [3, 6, 9, 12, 15]), ('lower price / below executed size', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [3, 6, 9, 12, 15]), ('normal contract', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('lower price', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('unrelated acknowledgment', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('future revision', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 3, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('no collateral held', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 0, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('price replacement', {'old_price': 10, 'new_price': 12, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('size increase', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 12, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [12, 24, 36, 48, 60]), ('acknowledged cancel', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': True, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30])]
def vary(value):
 if type(value) is int: return value*N
 if isinstance(value,list): return [vary(v) for v in value]
 if isinstance(value,dict): return {k:(v if k in ['count', 'delivery_index', 'disputed', 'maximum_set', 'minimum_set', 'stage', 'threshold', 'waived'] else vary(v)) for k,v in value.items()}
 return value
for label, request, expected in fixtures:
 check(label, solve(vary(request))['filled-floor'], expected[N-1])
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
below executed size83Failed
lower price / below executed size83Failed
normal contract66Passed
lower price66Passed
unrelated acknowledgment66Passed
future revision66Passed
no collateral held66Passed
price replacement66Passed
size increase1212Passed
acknowledged cancel66Passed

SHA-256 / 54b61fa08f9b46a8f31f7ff89c86e8f1ad9cfc1487dce4f7f9db4ccfbe61452e

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(x):
    v0 = x["now"] if x["new_total"]>x["total"] else x["stamp"]
    v1 = x["now"] if x["new_price"]!=x["old_price"] else x["stamp"]
    v2 = max(x["filled"],x["new_total"])
    v3 = max(0,x["new_total"]-x["filled"])
    v4 = 0 if x["cancel"] and x["ack"] else max(0,x["total"]-x["filled"])
    v5 = x["expected"]==x["revision"]
    v6 = x["old_lot"]==x["new_lot"]
    v7 = x["old_owner"]==x["new_owner"]
    v8 = not x["frozen"] or (x["new_price"]==x["old_price"] and x["new_total"]<=x["total"])
    v9 = x["revision"] if x["request_id"]==x["last_id"] else x["revision"]+1
    return {'increase-priority':v0,'price-priority':v1,'filled-floor':v2,'remaining-recalculation':v3,'cancel-ack-gate':v4,'revision-compare':v5,'lot-immutability':v6,'owner-immutability':v7,'freeze-restriction':v8,'request-replay':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('below executed size', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [3, 6, 9, 12, 15]), ('lower price / below executed size', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 2, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [3, 6, 9, 12, 15]), ('normal contract', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('lower price', {'old_price': 10, 'new_price': 8, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('unrelated acknowledgment', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('future revision', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 3, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('no collateral held', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 0, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('price replacement', {'old_price': 10, 'new_price': 12, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30]), ('size increase', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 12, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': False, 'ack': False, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [12, 24, 36, 48, 60]), ('acknowledged cancel', {'old_price': 10, 'new_price': 10, 'total': 8, 'new_total': 6, 'filled': 3, 'stamp': 1, 'now': 8, 'cancel': True, 'ack': True, 'revision': 2, 'expected': 2, 'old_lot': 'A', 'new_lot': 'A', 'old_owner': 'a', 'new_owner': 'a', 'frozen': False, 'held': 8, 'request_id': 'r2', 'last_id': 'r1'}, [6, 12, 18, 24, 30])]
def vary(value):
 if type(value) is int: return value*N
 if isinstance(value,list): return [vary(v) for v in value]
 if isinstance(value,dict): return {k:(v if k in ['count', 'delivery_index', 'disputed', 'maximum_set', 'minimum_set', 'stage', 'threshold', 'waived'] else vary(v)) for k,v in value.items()}
 return value
for label, request, expected in fixtures:
 check(label, solve(vary(request))['filled-floor'], expected[N-1])
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
below executed size33Passed
lower price / below executed size33Passed
normal contract66Passed
lower price66Passed
unrelated acknowledgment66Passed
future revision66Passed
no collateral held66Passed
price replacement66Passed
size increase1212Passed
acknowledged cancel66Passed

SHA-256 / 37a11f623003c18fb92d17399a384acf83df28ba2dfd541408e529e63df722c1

Verification & scope

Stipulated toy auction rules, not a venue specification, financial advice, optimization claim, or live trading implementation. Nonnegative integer inputs and internally aligned list fields only. 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 2026-09-29T14:46:06.829878+00:00.

Case digest / 5174d2febba0e2f9b2a2c2d652c771571ac4d3efbcf81a6092df9abd5e92109d