FA-21216 / Assistive announcements / Open access
Stale timer rolls escalation time backward · case 01
The announcement trace violates the stated escalation-ladder contract.
ROOT CAUSE
Fault site: now=max(now,e[1]) is implemented as now=e[1]
THE FAILURE
Fault site: now=max(now,e[1]) is implemented as now=e[1]
Unsuccessful approach: The attempted repair substitutes now+=e[1] and still violates a regression oracle.
Case contract
Unacknowledged notices have [text,level,next-due]. Open replaces notice at level0 due after2 ticks. Tick uses monotonic clock and emits at most one escalation per notice when due; levels1 and2 schedule another2 ticks, level3 is final and has no future due. Ack removes notice. Snooze adds delay to existing deadline, not now. Edit text preserves escalation level. Reset-level sets level0 and next due now+2. Report [id,text,level] speech and pending state.
Why this case matters
Deterministic controlled model of assistive announcement delivery.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(events):
now=0; notices={}; out=[]
for e in events:
if e[0]=='open': notices[e[1]]=[e[2],0,now+2]
elif e[0]=='ack': notices.pop(e[1],None)
elif e[0]=='edit' and e[1] in notices: notices[e[1]][0]=e[2]
elif e[0]=='snooze' and e[1] in notices:
if notices[e[1]][2] is not None: notices[e[1]][2]+=e[2]
elif e[0]=='reset' and e[1] in notices: notices[e[1]][1:]=[0,now+2]
elif e[0]=='tick':
now=e[1]
for ident,t in notices.items():
if t[2] is None or t[2]>now: continue
t[1]+=1
out.append([ident,t[0],t[1]])
t[2]=now+2 if t[1]<3 else None
return [out,now,[[k]+v for k,v in notices.items()]]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['open','a','alarm'*N],['tick',2],['tick',4],['tick',6],['tick',8]]", "[['tick',N+3],['open','a','fresh'],['open','a','replace'*N]]", "[['open','a','x'*N],['tick',2],['snooze','a',N]]", "[['open','a','old'],['tick',2],['edit','a','new'*N],['snooze','a',N],['tick',N+4]]", "[['open','a','a'*N],['open','b','b'],['ack','a'],['tick',N+4]]", "[['open','a','a'*N],['tick',3],['reset','a'],['tick',1]]", "[['open','a','a'*N],['tick',N+10]]", '[]']
expected = {1: [[[['a', 'alarm', 1], ['a', 'alarm', 2], ['a', 'alarm', 3]], 8, [['a', 'alarm', 3, None]]], [[], 4, [['a', 'replace', 0, 6]]], [[['a', 'x', 1]], 2, [['a', 'x', 1, 5]]], [[['a', 'old', 1], ['a', 'new', 2]], 5, [['a', 'new', 2, 7]]], [[['b', 'b', 1]], 5, [['b', 'b', 1, 7]]], [[['a', 'a', 1]], 3, [['a', 'a', 0, 5]]], [[['a', 'a', 1]], 11, [['a', 'a', 1, 13]]], [[], 0, []]], 2: [[[['a', 'alarmalarm', 1], ['a', 'alarmalarm', 2], ['a', 'alarmalarm', 3]], 8, [['a', 'alarmalarm', 3, None]]], [[], 5, [['a', 'replacereplace', 0, 7]]], [[['a', 'xx', 1]], 2, [['a', 'xx', 1, 6]]], [[['a', 'old', 1], ['a', 'newnew', 2]], 6, [['a', 'newnew', 2, 8]]], [[['b', 'b', 1]], 6, [['b', 'b', 1, 8]]], [[['a', 'aa', 1]], 3, [['a', 'aa', 0, 5]]], [[['a', 'aa', 1]], 12, [['a', 'aa', 1, 14]]], [[], 0, []]], 3: [[[['a', 'alarmalarmalarm', 1], ['a', 'alarmalarmalarm', 2], ['a', 'alarmalarmalarm', 3]], 8, [['a', 'alarmalarmalarm', 3, None]]], [[], 6, [['a', 'replacereplacereplace', 0, 8]]], [[['a', 'xxx', 1]], 2, [['a', 'xxx', 1, 7]]], [[['a', 'old', 1], ['a', 'newnewnew', 2]], 7, [['a', 'newnewnew', 2, 9]]], [[['b', 'b', 1]], 7, [['b', 'b', 1, 9]]], [[['a', 'aaa', 1]], 3, [['a', 'aaa', 0, 5]]], [[['a', 'aaa', 1]], 13, [['a', 'aaa', 1, 15]]], [[], 0, []]], 4: [[[['a', 'alarmalarmalarmalarm', 1], ['a', 'alarmalarmalarmalarm', 2], ['a', 'alarmalarmalarmalarm', 3]], 8, [['a', 'alarmalarmalarmalarm', 3, None]]], [[], 7, [['a', 'replacereplacereplacereplace', 0, 9]]], [[['a', 'xxxx', 1]], 2, [['a', 'xxxx', 1, 8]]], [[['a', 'old', 1], ['a', 'newnewnewnew', 2]], 8, [['a', 'newnewnewnew', 2, 10]]], [[['b', 'b', 1]], 8, [['b', 'b', 1, 10]]], [[['a', 'aaaa', 1]], 3, [['a', 'aaaa', 0, 5]]], [[['a', 'aaaa', 1]], 14, [['a', 'aaaa', 1, 16]]], [[], 0, []]], 5: [[[['a', 'alarmalarmalarmalarmalarm', 1], ['a', 'alarmalarmalarmalarmalarm', 2], ['a', 'alarmalarmalarmalarmalarm', 3]], 8, [['a', 'alarmalarmalarmalarmalarm', 3, None]]], [[], 8, [['a', 'replacereplacereplacereplacereplace', 0, 10]]], [[['a', 'xxxxx', 1]], 2, [['a', 'xxxxx', 1, 9]]], [[['a', 'old', 1], ['a', 'newnewnewnewnew', 2]], 9, [['a', 'newnewnewnewnew', 2, 11]]], [[['b', 'b', 1]], 9, [['b', 'b', 1, 11]]], [[['a', 'aaaaa', 1]], 3, [['a', 'aaaaa', 0, 5]]], [[['a', 'aaaaa', 1]], 15, [['a', 'aaaaa', 1, 17]]], [[], 0, []]]}[N]
for i, expression in enumerate(fixtures):
check("trace-"+str(i+1), solve(eval(expression)), expected[i])
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 |
|---|---|---|---|
| trace-1 | [[['a', 'alarm', 1], ['a', 'alarm', 2], ['a', 'alarm', 3]], 8, [['a', 'alarm', 3, None]]] | [[['a', 'alarm', 1], ['a', 'alarm', 2], ['a', 'alarm', 3]], 8, [['a', 'alarm', 3, None]]] | Passed |
| trace-2 | [[], 4, [['a', 'replace', 0, 6]]] | [[], 4, [['a', 'replace', 0, 6]]] | Passed |
| trace-3 | [[['a', 'x', 1]], 2, [['a', 'x', 1, 5]]] | [[['a', 'x', 1]], 2, [['a', 'x', 1, 5]]] | Passed |
| trace-4 | [[['a', 'old', 1], ['a', 'new', 2]], 5, [['a', 'new', 2, 7]]] | [[['a', 'old', 1], ['a', 'new', 2]], 5, [['a', 'new', 2, 7]]] | Passed |
| trace-5 | [[['b', 'b', 1]], 5, [['b', 'b', 1, 7]]] | [[['b', 'b', 1]], 5, [['b', 'b', 1, 7]]] | Passed |
| trace-6 | [[['a', 'a', 1]], 1, [['a', 'a', 0, 5]]] | [[['a', 'a', 1]], 3, [['a', 'a', 0, 5]]] | Failed |
| trace-7 | [[['a', 'a', 1]], 11, [['a', 'a', 1, 13]]] | [[['a', 'a', 1]], 11, [['a', 'a', 1, 13]]] | Passed |
| trace-8 | [[], 0, []] | [[], 0, []] | Passed |
SHA-256 / 15409f914bd431c4d2fe479c816688af97f31dac52603b0cce5ebf76f98e2af3
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(events):
now=0; notices={}; out=[]
for e in events:
if e[0]=='open': notices[e[1]]=[e[2],0,now+2]
elif e[0]=='ack': notices.pop(e[1],None)
elif e[0]=='edit' and e[1] in notices: notices[e[1]][0]=e[2]
elif e[0]=='snooze' and e[1] in notices:
if notices[e[1]][2] is not None: notices[e[1]][2]+=e[2]
elif e[0]=='reset' and e[1] in notices: notices[e[1]][1:]=[0,now+2]
elif e[0]=='tick':
now+=e[1]
for ident,t in notices.items():
if t[2] is None or t[2]>now: continue
t[1]+=1
out.append([ident,t[0],t[1]])
t[2]=now+2 if t[1]<3 else None
return [out,now,[[k]+v for k,v in notices.items()]]
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = ["[['open','a','alarm'*N],['tick',2],['tick',4],['tick',6],['tick',8]]", "[['tick',N+3],['open','a','fresh'],['open','a','replace'*N]]", "[['open','a','x'*N],['tick',2],['snooze','a',N]]", "[['open','a','old'],['tick',2],['edit','a','new'*N],['snooze','a',N],['tick',N+4]]", "[['open','a','a'*N],['open','b','b'],['ack','a'],['tick',N+4]]", "[['open','a','a'*N],['tick',3],['reset','a'],['tick',1]]", "[['open','a','a'*N],['tick',N+10]]", '[]']
expected = {1: [[[['a', 'alarm', 1], ['a', 'alarm', 2], ['a', 'alarm', 3]], 8, [['a', 'alarm', 3, None]]], [[], 4, [['a', 'replace', 0, 6]]], [[['a', 'x', 1]], 2, [['a', 'x', 1, 5]]], [[['a', 'old', 1], ['a', 'new', 2]], 5, [['a', 'new', 2, 7]]], [[['b', 'b', 1]], 5, [['b', 'b', 1, 7]]], [[['a', 'a', 1]], 3, [['a', 'a', 0, 5]]], [[['a', 'a', 1]], 11, [['a', 'a', 1, 13]]], [[], 0, []]], 2: [[[['a', 'alarmalarm', 1], ['a', 'alarmalarm', 2], ['a', 'alarmalarm', 3]], 8, [['a', 'alarmalarm', 3, None]]], [[], 5, [['a', 'replacereplace', 0, 7]]], [[['a', 'xx', 1]], 2, [['a', 'xx', 1, 6]]], [[['a', 'old', 1], ['a', 'newnew', 2]], 6, [['a', 'newnew', 2, 8]]], [[['b', 'b', 1]], 6, [['b', 'b', 1, 8]]], [[['a', 'aa', 1]], 3, [['a', 'aa', 0, 5]]], [[['a', 'aa', 1]], 12, [['a', 'aa', 1, 14]]], [[], 0, []]], 3: [[[['a', 'alarmalarmalarm', 1], ['a', 'alarmalarmalarm', 2], ['a', 'alarmalarmalarm', 3]], 8, [['a', 'alarmalarmalarm', 3, None]]], [[], 6, [['a', 'replacereplacereplace', 0, 8]]], [[['a', 'xxx', 1]], 2, [['a', 'xxx', 1, 7]]], [[['a', 'old', 1], ['a', 'newnewnew', 2]], 7, [['a', 'newnewnew', 2, 9]]], [[['b', 'b', 1]], 7, [['b', 'b', 1, 9]]], [[['a', 'aaa', 1]], 3, [['a', 'aaa', 0, 5]]], [[['a', 'aaa', 1]], 13, [['a', 'aaa', 1, 15]]], [[], 0, []]], 4: [[[['a', 'alarmalarmalarmalarm', 1], ['a', 'alarmalarmalarmalarm', 2], ['a', 'alarmalarmalarmalarm', 3]], 8, [['a', 'alarmalarmalarmalarm', 3, None]]], [[], 7, [['a', 'replacereplacereplacereplace', 0, 9]]], [[['a', 'xxxx', 1]], 2, [['a', 'xxxx', 1, 8]]], [[['a', 'old', 1], ['a', 'newnewnewnew', 2]], 8, [['a', 'newnewnewnew', 2, 10]]], [[['b', 'b', 1]], 8, [['b', 'b', 1, 10]]], [[['a', 'aaaa', 1]], 3, [['a', 'aaaa', 0, 5]]], [[['a', 'aaaa', 1]], 14, [['a', 'aaaa', 1, 16]]], [[], 0, []]], 5: [[[['a', 'alarmalarmalarmalarmalarm', 1], ['a', 'alarmalarmalarmalarmalarm', 2], ['a', 'alarmalarmalarmalarmalarm', 3]], 8, [['a', 'alarmalarmalarmalarmalarm', 3, None]]], [[], 8, [['a', 'replacereplacereplacereplacereplace', 0, 10]]], [[['a', 'xxxxx', 1]], 2, [['a', 'xxxxx', 1, 9]]], [[['a', 'old', 1], ['a', 'newnewnewnewnew', 2]], 9, [['a', 'newnewnewnewnew', 2, 11]]], [[['b', 'b', 1]], 9, [['b', 'b', 1, 11]]], [[['a', 'aaaaa', 1]], 3, [['a', 'aaaaa', 0, 5]]], [[['a', 'aaaaa', 1]], 15, [['a', 'aaaaa', 1, 17]]], [[], 0, []]]}[N]
for i, expression in enumerate(fixtures):
check("trace-"+str(i+1), solve(eval(expression)), expected[i])
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 |
|---|---|---|---|
| trace-1 | [[['a', 'alarm', 1], ['a', 'alarm', 2], ['a', 'alarm', 3]], 20, [['a', 'alarm', 3, None]]] | [[['a', 'alarm', 1], ['a', 'alarm', 2], ['a', 'alarm', 3]], 8, [['a', 'alarm', 3, None]]] | Failed |
| trace-2 | [[], 4, [['a', 'replace', 0, 6]]] | [[], 4, [['a', 'replace', 0, 6]]] | Passed |
| trace-3 | [[['a', 'x', 1]], 2, [['a', 'x', 1, 5]]] | [[['a', 'x', 1]], 2, [['a', 'x', 1, 5]]] | Passed |
| trace-4 | [[['a', 'old', 1], ['a', 'new', 2]], 7, [['a', 'new', 2, 9]]] | [[['a', 'old', 1], ['a', 'new', 2]], 5, [['a', 'new', 2, 7]]] | Failed |
| trace-5 | [[['b', 'b', 1]], 5, [['b', 'b', 1, 7]]] | [[['b', 'b', 1]], 5, [['b', 'b', 1, 7]]] | Passed |
| trace-6 | [[['a', 'a', 1]], 4, [['a', 'a', 0, 5]]] | [[['a', 'a', 1]], 3, [['a', 'a', 0, 5]]] | Failed |
| trace-7 | [[['a', 'a', 1]], 11, [['a', 'a', 1, 13]]] | [[['a', 'a', 1]], 11, [['a', 'a', 1, 13]]] | Passed |
| trace-8 | [[], 0, []] | [[], 0, []] | Passed |
SHA-256 / 132af9ac4d4bd3e390c6fa38f892ac442880379399f1f82fc11e0438ecb985a1
HELD IN THE MEMBER ARCHIVE
The verified repair and its recorded checks are member-only.
This mechanism has 8 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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Sign in to the archive ↗Verification & scope
Stipulated bounded policy, not a browser, speech engine, platform API, or standards conformance claim. 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 2026-09-29T14:40:26.633722+00:00.
Case digest / 91a32c193a05e82cf50fc5749eb37b5e2836162a347b4be6c1a9e8568ebfa39b