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FA-56446 / Auction allocation rules / Open access

Escrow reservation: atomic replacement · case 01

A failed collateral amendment destroys the previous valid reservation.

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

ROOT CAUSE

A failed collateral amendment destroys the previous valid reservation.

THE FAILURE

A failed collateral amendment destroys the previous valid reservation.

Unsuccessful approach: The attempted repair uses x["new_hold"] if x["replace_ok"] else 0; the explicit regression cases demonstrate that this still violates the stipulated auction rule.

Case contract

A toy per-auction escrow account distinguishes available funds, reserved collateral, captured fill payments and pending releases. Reservation replaces an old hold atomically; a failed replacement retains the old hold. Separate auction holds must remain unavailable. Named decision atomic-replacement: Keep the old hold intact until replacement succeeds.

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["balance"]-x["other_hold"] >= x["new_hold"]
    v1 = x["new_hold"]
    v2 = max(0,x["old_hold"]-x["fill_cost"])
    v3 = x["balance"]-x["old_hold"]-x["other_hold"]+(x["pending"] if x["confirmed"] else 0)
    v4 = min(x["refund"],x["captured"])
    v5 = x["old_hold"]+x["bond"]
    v6 = max(0,x["old_hold"]-x["fill_cost"]) if x["closed"] else 0
    v7 = min(x["release"],max(0,x["old_hold"]-x["fill_cost"]))
    v8 = max(0,x["fill_cost"]-x["fee"])
    v9 = x["balance"]-x["other_hold"]-x["new_hold"] >= x["fee"]
    return {'replace-credit':v0,'atomic-replacement':v1,'capture-release':v2,'pending-release-availability':v3,'refund-ceiling':v4,'bond-separation':v5,'close-release':v6,'release-clamp':v7,'seller-net-remittance':v8,'unreserved-fee-check':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('insufficient replacement', {'balance': 100, 'old_hold': 30, 'new_hold': 200, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': False, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [30, 60, 90, 120, 150]), ('reuse existing collateral / insufficient replacement', {'balance': 100, 'old_hold': 30, 'new_hold': 200, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': False, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [30, 60, 90, 120, 150]), ('normal contract', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [50, 100, 150, 200, 250]), ('reuse existing collateral', {'balance': 100, 'old_hold': 30, 'new_hold': 70, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [70, 140, 210, 280, 350]), ('other auction limits credit', {'balance': 100, 'old_hold': 30, 'new_hold': 90, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [90, 180, 270, 360, 450]), ('old hold larger', {'balance': 100, 'old_hold': 30, 'new_hold': 15, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [15, 30, 45, 60, 75]), ('confirmed release', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': True, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [50, 100, 150, 200, 250]), ('fully captured', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 30, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [50, 100, 150, 200, 250]), ('zero reservation', {'balance': 100, 'old_hold': 0, 'new_hold': 0, 'other_hold': 0, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [0, 0, 0, 0, 0]), ('closed auction', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': True}, [50, 100, 150, 200, 250])]
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))['atomic-replacement'], 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
insufficient replacement20030Failed
reuse existing collateral / insufficient replacement20030Failed
normal contract5050Passed
reuse existing collateral7070Passed
other auction limits credit9090Passed
old hold larger1515Passed
confirmed release5050Passed
fully captured5050Passed
zero reservation00Passed
closed auction5050Passed

SHA-256 / 52a512e27757f645f701ab5e0b396bb4347fe8186b1ab3dec3430ca2ba68fae2

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(x):
    v0 = x["balance"]-x["other_hold"] >= x["new_hold"]
    v1 = x["new_hold"] if x["replace_ok"] else 0
    v2 = max(0,x["old_hold"]-x["fill_cost"])
    v3 = x["balance"]-x["old_hold"]-x["other_hold"]+(x["pending"] if x["confirmed"] else 0)
    v4 = min(x["refund"],x["captured"])
    v5 = x["old_hold"]+x["bond"]
    v6 = max(0,x["old_hold"]-x["fill_cost"]) if x["closed"] else 0
    v7 = min(x["release"],max(0,x["old_hold"]-x["fill_cost"]))
    v8 = max(0,x["fill_cost"]-x["fee"])
    v9 = x["balance"]-x["other_hold"]-x["new_hold"] >= x["fee"]
    return {'replace-credit':v0,'atomic-replacement':v1,'capture-release':v2,'pending-release-availability':v3,'refund-ceiling':v4,'bond-separation':v5,'close-release':v6,'release-clamp':v7,'seller-net-remittance':v8,'unreserved-fee-check':v9}
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [('insufficient replacement', {'balance': 100, 'old_hold': 30, 'new_hold': 200, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': False, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [30, 60, 90, 120, 150]), ('reuse existing collateral / insufficient replacement', {'balance': 100, 'old_hold': 30, 'new_hold': 200, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': False, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [30, 60, 90, 120, 150]), ('normal contract', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [50, 100, 150, 200, 250]), ('reuse existing collateral', {'balance': 100, 'old_hold': 30, 'new_hold': 70, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [70, 140, 210, 280, 350]), ('other auction limits credit', {'balance': 100, 'old_hold': 30, 'new_hold': 90, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [90, 180, 270, 360, 450]), ('old hold larger', {'balance': 100, 'old_hold': 30, 'new_hold': 15, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [15, 30, 45, 60, 75]), ('confirmed release', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': True, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [50, 100, 150, 200, 250]), ('fully captured', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 30, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [50, 100, 150, 200, 250]), ('zero reservation', {'balance': 100, 'old_hold': 0, 'new_hold': 0, 'other_hold': 0, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': False}, [0, 0, 0, 0, 0]), ('closed auction', {'balance': 100, 'old_hold': 30, 'new_hold': 50, 'other_hold': 20, 'fill_cost': 12, 'release': 5, 'pending': 7, 'confirmed': False, 'replace_ok': True, 'captured': 10, 'refund': 4, 'fee': 3, 'bond': 8, 'closed': True}, [50, 100, 150, 200, 250])]
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))['atomic-replacement'], 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
insufficient replacement030Failed
reuse existing collateral / insufficient replacement030Failed
normal contract5050Passed
reuse existing collateral7070Passed
other auction limits credit9090Passed
old hold larger1515Passed
confirmed release5050Passed
fully captured5050Passed
zero reservation00Passed
closed auction5050Passed

SHA-256 / d862a1d1c325a673f6bef54555b5b7210e208b07c7beaf801a5545f5bdae52e8

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 10 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 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 2026-09-29T14:46:07.217706+00:00.

Case digest / f4135d82ce5be11446dcbe6810f404b84e0fc8137b418dd4067ad3757ae5de1d