FA-24836 / Client state / Open access

Transferring one buffer view leaves another alias marked readable on the main thread · case 01

Transferring one buffer view leaves another alias marked readable on the main thread.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The faulty implementation violates Transferring a view detaches every main-thread view sharing its backing buffer, but leaves views of other buffers readable; unknown view names transfer nothing.

THE FAILURE

The faulty implementation violates Transferring a view detaches every main-thread view sharing its backing buffer, but leaves views of other buffers readable; unknown view names transfer nothing.

Unsuccessful approach: The partial repair still violates at least one explicit regression oracle.

Case contract

Transferring a view detaches every main-thread view sharing its backing buffer, but leaves views of other buffers readable; unknown view names transfer nothing.

Why this case matters

A bounded offline client-state transition with explicit lifecycle inputs.

1 / The failure

Exit 1

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

N = 1
observations = []
def solve(views, transfer_views):
    return [(name,name not in transfer_views) for name,buffer in views]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('two views one buffer', solve([('a','buf'),('b','buf'),('c','other')],['a']), [('a',False),('b',False),('c',True)])
check('no transfer', solve([('a','buf')],[]), [('a',True)])
check('unknown view', solve([('a','buf')],['missing']), [('a',True)])
check('separate buffer transferred', solve([('a','x'),('b','y')],['b']), [('a',True),('b',False)])
check('empty views', solve([],['a']), [])
check('parameterized aliases', solve([(str(i),'shared') for i in range(N+1)],['0']), [(str(i),False) for i in range(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
two views one buffer	`[['a', False], ['b', True], ['c', True]]`	`[['a', False], ['b', False], ['c', True]]`	Failed
no transfer	`[['a', True]]`	`[['a', True]]`	Passed
unknown view	`[['a', True]]`	`[['a', True]]`	Passed
separate buffer transferred	`[['a', True], ['b', False]]`	`[['a', True], ['b', False]]`	Passed
empty views	`[]`	`[]`	Passed
parameterized aliases	`[['0', False], ['1', True]]`	`[['0', False], ['1', False]]`	Failed

SHA-256 / f44165781a7f80f4d531e1591926251d0d369df80e320bc3a146f32e194bac5d

2 / The unsuccessful fix

Exit 1

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

N = 1
observations = []
def solve(views, transfer_views):
    return [(name,not transfer_views) for name,buffer in views]
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('two views one buffer', solve([('a','buf'),('b','buf'),('c','other')],['a']), [('a',False),('b',False),('c',True)])
check('no transfer', solve([('a','buf')],[]), [('a',True)])
check('unknown view', solve([('a','buf')],['missing']), [('a',True)])
check('separate buffer transferred', solve([('a','x'),('b','y')],['b']), [('a',True),('b',False)])
check('empty views', solve([],['a']), [])
check('parameterized aliases', solve([(str(i),'shared') for i in range(N+1)],['0']), [(str(i),False) for i in range(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
two views one buffer	`[['a', False], ['b', False], ['c', False]]`	`[['a', False], ['b', False], ['c', True]]`	Failed
no transfer	`[['a', True]]`	`[['a', True]]`	Passed
unknown view	`[['a', False]]`	`[['a', True]]`	Failed
separate buffer transferred	`[['a', False], ['b', False]]`	`[['a', True], ['b', False]]`	Failed
empty views	`[]`	`[]`	Passed
parameterized aliases	`[['0', False], ['1', False]]`	`[['0', False], ['1', False]]`	Passed

SHA-256 / 44161855b052e644a9331ebcf5405ae62877f92e154b4edd34f2c4b5bd473d38

HELD IN THE MEMBER ARCHIVE

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

This mechanism has 6 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

This models the stated application policy only; no browser or framework 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 2026-09-29T14:41:01.207599+00:00.

Case digest / 8adf91a3fef9413dba6278d31f30fb37a862817ce28333471d42a5e0c5b50adb