FA-56486 / Auction allocation rules / Open access

Escrow reservation: unreserved fee check · case 01

Admission approves a fee using funds already committed to the replacement bid.

Verified by executionVariant 1 · 9 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Admission approves a fee using funds already committed to the replacement bid.

THE FAILURE

Admission approves a fee using funds already committed to the replacement bid.

Unsuccessful approach: The attempted repair uses x["balance"]-x["other_hold"]>=x["fee"]; 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 unreserved-fee-check: Check fee funds after both replacement and unrelated reservations.

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"] if x["replace_ok"] else x["old_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["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 = [('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}, [False, False, False, False, False]), ('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}, [False, False, False, False, False]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True])]
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))['unreserved-fee-check'], 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 fixture	Actual	Expected	Outcome
other auction limits credit	`True`	`False`	Failed
insufficient replacement	`True`	`False`	Failed
normal contract	`True`	`True`	Passed
reuse existing collateral	`True`	`True`	Passed
old hold larger	`True`	`True`	Passed
confirmed release	`True`	`True`	Passed
fully captured	`True`	`True`	Passed
zero reservation	`True`	`True`	Passed
closed auction	`True`	`True`	Passed

SHA-256 / 5d7b9b8af2b56f811b4757813c1fc8585c2fac38f9e4f2f4315a8fd76dbc1867

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 x["old_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["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 = [('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}, [False, False, False, False, False]), ('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}, [False, False, False, False, False]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True]), ('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}, [True, True, True, True, True])]
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))['unreserved-fee-check'], 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 fixture	Actual	Expected	Outcome
other auction limits credit	`True`	`False`	Failed
insufficient replacement	`True`	`False`	Failed
normal contract	`True`	`True`	Passed
reuse existing collateral	`True`	`True`	Passed
old hold larger	`True`	`True`	Passed
confirmed release	`True`	`True`	Passed
fully captured	`True`	`True`	Passed
zero reservation	`True`	`True`	Passed
closed auction	`True`	`True`	Passed

SHA-256 / 9201766e49b0124fd7f56c7e737f2aa5db702a7e9d35e3912b3a6e3243cb22f7

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 9 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.

Member access is invitation-based. Sign in with your invited account to inspect the repair.

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 2026-09-29T14:46:07.583322+00:00.

Case digest / 2bd2d8c7211db7a373b054ad2a1802c6c8473ce868232eda2e1c207b01cdbc8f