FA-7736 / Connection lifecycle / Open access

Pool return requires complete message boundary · case 01

Pool return requires complete message boundary.

Verified by executionVariant 1 · 4 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The faulty implementation uses `remaining == 0 and open_` for the pool-return-requires-complete-message-boundary decision.

VERIFIED REPAIR

Apply the explicit pool-return-requires-complete-message-boundary contract, including the tested boundary and negative cases.

Unsuccessful approach: The attempted repair uses `not eof_delimited and open_` and still violates a separate fixture.

Case contract

Bounded offline decision model: pool return requires complete message boundary. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.

Why this case matters

This deterministic connection lifecycle model isolates the pool-return-requires-complete-message-boundary policy at a network component boundary.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import ipaddress
import re
from urllib.parse import urlsplit, urljoin
N = 1
observations = []
def solve(remaining, eof_delimited, open_):
    return remaining == 0 and open_
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
_fixtures = ["check('fixture 1', solve(0, True, True), False)", "check('fixture 2', solve(2, False, True), False)", "check('fixture 3', solve(0, False, True), True)", "check('fixture 4', solve(0, False, False), False)"]
for _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:
    exec(_line)
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
fixture 2	`False`	`False`	Passed
fixture 3	`True`	`True`	Passed
fixture 4	`False`	`False`	Passed
fixture 1	`True`	`False`	Failed

SHA-256 / a359b4a74dd3bdb8c6d9a6e17e99acddedd83fcb2086e32c1c272102104df440

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import ipaddress
import re
from urllib.parse import urlsplit, urljoin
N = 1
observations = []
def solve(remaining, eof_delimited, open_):
    return not eof_delimited and open_
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
_fixtures = ["check('fixture 1', solve(0, True, True), False)", "check('fixture 2', solve(2, False, True), False)", "check('fixture 3', solve(0, False, True), True)", "check('fixture 4', solve(0, False, False), False)"]
for _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:
    exec(_line)
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
fixture 2	`True`	`False`	Failed
fixture 3	`True`	`True`	Passed
fixture 4	`False`	`False`	Passed
fixture 1	`False`	`False`	Passed

SHA-256 / 50a9c716634bc21e96827bc535b9d1adf87cce3d4ce4e5397018fbba126dec3a

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import ipaddress
import re
from urllib.parse import urlsplit, urljoin
N = 1
observations = []
def solve(remaining, eof_delimited, open_):
    return remaining == 0 and not eof_delimited and open_
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
_fixtures = ["check('fixture 1', solve(0, True, True), False)", "check('fixture 2', solve(2, False, True), False)", "check('fixture 3', solve(0, False, True), True)", "check('fixture 4', solve(0, False, False), False)"]
for _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:
    exec(_line)
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
fixture 2	`False`	`False`	Passed
fixture 3	`True`	`True`	Passed
fixture 4	`False`	`False`	Passed
fixture 1	`False`	`False`	Passed

SHA-256 / 46f84e2033cd1c7b159d53f40fce4b32b52f215973f2572d7aabdae63a8ea15a

Verification & scope

Bounded deterministic policy model over validated inputs; not a complete protocol stack or an interoperability claim. The five variants rotate the same explicit fixture set. 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 2026-09-29T14:38:14.817881+00:00.

Case digest / f77ee7a5fee5e59d6a2819cba8ad92522cf68c7356359d51b797ec43cef316b1