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    "series": "freertos-c",
    "series_title": "FreeRTOS C",
    "number": "12",
    "count": "15",
    "slug": "diagnostics",
    "title": "Assertions, hooks and runtime diagnostics",
    "topic": "healthy evidence and four isolated expected-fail fixtures",
    "project": "Freestanding C nad FreeRTOS",
    "subject": "Informatyka",
    "level": "Rok 2 · L12 · RV32I/Hazard3",
    "revision_date": "2026-07-19T00:00:00+02:00",
    "status": "Gotowa",
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    "author": "M. Pabiszczak",
    "year": "2026"
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      "id": "A8",
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      "subtitle": "no new pattern",
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        "diagnostic boundaries remain visible"
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        "image SHA256",
        "symbol"
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      "prerequisites": [
        "built artifact"
      ],
      "layout": [
        "ABI",
        "artifact",
        "symbols"
      ],
      "commands": [
        "make check-abi",
        "riscv64-unknown-elf-nm build/task01_diagnostics/prog.elf"
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        "artifact",
        "three processes"
      ],
      "commands": [
        "make check-abi",
        "make check-determinism"
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    "title": "Assertions, hooks and runtime diagnostics",
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    "title": "Cel karty",
    "content_tex": "Uczeń rozróżnia asercję, hook kernela i monitor aplikacyjny oraz zachowuje wystarczający dowód, aby wskazać zamierzony terminal bez fałszywego PASS.",
    "scope_title": "Zakres karty",
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        "Najważniejsza idea",
        "Priorytet",
        "Status",
        "Version"
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      "label": "Diagnostic boundaries",
      "text": "Uczeń rozróżnia asercję, hook kernela, historyczny watermark i monitor deadline.",
      "assessment_criteria": [
        "FC12.KW01"
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      "label": "Healthy and fault replay",
      "text": "Uczeń odtwarza E01-E10 i wiąże każdy terminal z zatwierdzonym rekordem.",
      "assessment_criteria": [
        "FC12.KW01"
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            "display": "EN LOCAL RTOS.12",
            "source": "LOCAL",
            "official": "RTOS",
            "local": "12",
            "kind": "EN",
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            "kw": [
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                "source": "LOCAL",
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            "official": "RTOS",
            "local": "12",
            "kind": "EK",
            "tree_id": "FC12.WE01.TECH.LOCAL.RTOS.12",
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            "kw": [
              {
                "criterion_ref": "FC12.KW01",
                "display": "KW LOCAL RTOS.12",
                "source": "LOCAL",
                "kind": "KW",
                "official": "RTOS",
                "local": "12",
                "text": "Łączy kod, diagram i zweryfikowany dowód."
              }
            ]
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    }
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      "title": "A1 — Diagnostic boundaries",
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      "content_tex": "The application measures health; the kernel calls bounded hooks; the simulator preserves source, ELF and terminal evidence.",
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                    "mode": "CODE",
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                    "evidence": "GDB selects after C startup"
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                  {
                    "id": "committed",
                    "number": 5,
                    "label": "evidence is committed before PASS",
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                    "event_id": "E06",
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                    "id": "events",
                    "number": 2,
                    "label": "DiagnosticsEvidence is commit-last",
                    "mode": "CODE",
                    "strategy_ref": "code.contracts",
                    "svg_label": "02",
                    "code_ref": "include/task01_diagnostics_model.h:6",
                    "description": "DiagnosticsEvidence is commit-last",
                    "evidence": "sequence/event/tick/value"
                  },
                  {
                    "id": "fault",
                    "number": 3,
                    "label": "DiagnosticFault freezes terminal data",
                    "mode": "CODE",
                    "strategy_ref": "code.contracts",
                    "svg_label": "03",
                    "code_ref": "include/task01_diagnostics.h:23",
                    "description": "DiagnosticFault freezes terminal data",
                    "evidence": "fixture/hook/line/task/SP"
                  },
                  {
                    "id": "storage",
                    "number": 4,
                    "label": "worker and monitor own static stacks",
                    "mode": "CODE",
                    "strategy_ref": "code.contracts",
                    "svg_label": "04",
                    "code_ref": "src/tasks/task01_diagnostics.c:25",
                    "description": "worker and monitor own static stacks",
                    "evidence": "distinct TCB and stack arrays"
                  },
                  {
                    "id": "fault-record",
                    "number": 5,
                    "label": "fault publication exposes committed marker",
                    "mode": "RUN",
                    "event_id": "E07",
                    "strategy_ref": "run.fixtures",
                    "svg_label": "05",
                    "code_ref": "src/tasks/task01_diagnostics.c:91",
                    "snapshot_ref": "task01.assert-hook",
                    "description": "fault publication exposes committed marker",
                    "evidence": "0xFC12FA17"
                  }
                ]
              }
            ]
          }
        }
      ]
    },
    {
      "title": "A5 — Healthy replay",
      "order": 50,
      "content_kind": "prose",
      "asset_page_mode": "one-per-page",
      "page_orientation": "portrait",
      "content_tex": "A worker publishes bounded work and a heartbeat. A lower-priority diagnostics task then records the historical stack watermark, task snapshot and final invariant result.",
      "assets": [
        {
          "path": "assets/a5-flow.png",
          "html_path": "assets/a5-flow.svg",
          "source_path": "assets/a5-flow.puml",
          "caption": "A5 FLOW — E01 to E06 healthy evidence.",
          "label": "fig:a5-flow",
          "alt": "A5 · healthy replay",
          "kind": "diagram",
          "width": 1.0,
          "page_grid": {
            "columns": 1,
            "rows": 1,
            "page_width": 660,
            "page_height": 760,
            "overview": true,
            "step_tiles": {
              "configured": 1,
              "worker-ran": 1,
              "heartbeat": 1,
              "watermark": 1,
              "snapshot": 1,
              "pass": 1
            }
          },
          "interactive": {
            "kind": "uml-sequence",
            "storage_key": "fc12-a5-flow",
            "title": "A5 · healthy replay",
            "task": {
              "id": "task01",
              "label": "Task01 · healthy run and fault fixtures"
            },
            "block": {
              "id": "a5",
              "label": "A5 FLOW",
              "description": "The healthy path publishes six ordered events from configuration through verified PASS."
            },
            "phases": [
              {
                "id": "healthy",
                "label": "HEALTHY E01–E06",
                "steps": [
                  {
                    "id": "configured",
                    "number": 1,
                    "label": "diagnostics enabled",
                    "mode": "RUN",
                    "event_id": "E01",
                    "strategy_ref": "run.healthy",
                    "svg_label": "01",
                    "code_ref": "src/tasks/task01_diagnostics.c:233",
                    "snapshot_ref": "task01.configured",
                    "description": "diagnostics enabled",
                    "evidence": "stack check level 2"
                  },
                  {
                    "id": "worker-ran",
                    "number": 2,
                    "label": "worker performs bounded work",
                    "mode": "RUN",
                    "event_id": "E02",
                    "strategy_ref": "run.healthy",
                    "svg_label": "02",
                    "code_ref": "src/tasks/task01_diagnostics.c:152",
                    "snapshot_ref": "task01.worker-ran",
                    "description": "worker performs bounded work",
                    "evidence": "value 21"
                  },
                  {
                    "id": "heartbeat",
                    "number": 3,
                    "label": "worker publishes heartbeat",
                    "mode": "RUN",
                    "event_id": "E03",
                    "strategy_ref": "run.healthy",
                    "svg_label": "03",
                    "code_ref": "src/tasks/task01_diagnostics.c:156",
                    "snapshot_ref": "task01.heartbeat",
                    "description": "worker publishes heartbeat",
                    "evidence": "heartbeat = 1"
                  },
                  {
                    "id": "watermark",
                    "number": 4,
                    "label": "diagnostics measures watermark",
                    "mode": "RUN",
                    "event_id": "E04",
                    "strategy_ref": "run.healthy",
                    "svg_label": "04",
                    "code_ref": "src/tasks/task01_diagnostics.c:181",
                    "snapshot_ref": "task01.watermark",
                    "description": "diagnostics measures watermark",
                    "evidence": "0 < HWM < 256"
                  },
                  {
                    "id": "snapshot",
                    "number": 5,
                    "label": "diagnostics snapshots task table",
                    "mode": "RUN",
                    "event_id": "E05",
                    "strategy_ref": "run.healthy",
                    "svg_label": "05",
                    "code_ref": "src/tasks/task01_diagnostics.c:182",
                    "snapshot_ref": "task01.snapshot",
                    "description": "diagnostics snapshots task table",
                    "evidence": "task count at least 3"
                  },
                  {
                    "id": "pass",
                    "number": 6,
                    "label": "all healthy invariants pass",
                    "mode": "RUN",
                    "event_id": "E06",
                    "strategy_ref": "run.healthy",
                    "svg_label": "06",
                    "code_ref": "src/tasks/task01_diagnostics.c:192",
                    "snapshot_ref": "task01.pass",
                    "description": "all healthy invariants pass",
                    "evidence": "PASS plus deterministic digest"
                  }
                ]
              }
            ]
          }
        }
      ]
    },
    {
      "title": "A6 — Healthy and expected-fail terminals",
      "order": 60,
      "content_kind": "prose",
      "asset_page_mode": "one-per-page",
      "page_orientation": "portrait",
      "content_tex": "Fixture selection occurs at main after startup. Each failing branch commits one typed record and must not reach the healthy PASS.",
      "assets": [
        {
          "path": "assets/a6-state.png",
          "html_path": "assets/a6-state.svg",
          "source_path": "assets/a6-state.puml",
          "caption": "A6 STATE — healthy PASS versus four isolated terminals.",
          "label": "fig:a6-state",
          "alt": "A6 · terminal states",
          "kind": "diagram",
          "width": 1.0,
          "page_grid": {
            "columns": 1,
            "rows": 1,
            "page_width": 660,
            "page_height": 760,
            "overview": true,
            "step_tiles": {
              "select": 1,
              "healthy-terminal": 1,
              "assert-hook": 1,
              "malloc-hook": 1,
              "stack-hook": 1,
              "deadline-hook": 1
            }
          },
          "interactive": {
            "kind": "uml-class",
            "storage_key": "fc12-a6-state",
            "title": "A6 · terminal states",
            "task": {
              "id": "task01",
              "label": "Task01 · healthy run and fault fixtures"
            },
            "block": {
              "id": "a6",
              "label": "A6 STATE",
              "description": "A run has exactly one terminal: healthy PASS or one selected expected fault."
            },
            "phases": [
              {
                "id": "terminal",
                "label": "ONE TERMINAL PER RUN",
                "steps": [
                  {
                    "id": "select",
                    "number": 1,
                    "label": "select fixture only after main",
                    "mode": "CODE",
                    "strategy_ref": "code.contracts",
                    "svg_label": "01",
                    "code_ref": "scripts/run_fixtures.sh:18",
                    "description": "select fixture only after main",
                    "evidence": "BSS cannot erase selector"
                  },
                  {
                    "id": "healthy-terminal",
                    "number": 2,
                    "label": "fixture 0 reaches healthy PASS",
                    "mode": "RUN",
                    "event_id": "E06",
                    "strategy_ref": "run.healthy",
                    "svg_label": "02",
                    "code_ref": "src/tasks/task01_diagnostics.c:198",
                    "snapshot_ref": "task01.pass",
                    "description": "fixture 0 reaches healthy PASS",
                    "evidence": "normal terminal"
                  },
                  {
                    "id": "assert-hook",
                    "number": 3,
                    "label": "assert fixture commits hook 1",
                    "mode": "RUN",
                    "event_id": "E07",
                    "strategy_ref": "run.fixtures",
                    "svg_label": "03",
                    "code_ref": "src/tasks/task01_diagnostics.c:100",
                    "snapshot_ref": "task01.assert-hook",
                    "description": "assert fixture commits hook 1",
                    "evidence": "fixture=1 hook=1"
                  },
                  {
                    "id": "malloc-hook",
                    "number": 4,
                    "label": "malloc fixture commits hook 2",
                    "mode": "RUN",
                    "event_id": "E08",
                    "strategy_ref": "run.fixtures",
                    "svg_label": "04",
                    "code_ref": "src/tasks/task01_diagnostics.c:100",
                    "snapshot_ref": "task01.malloc-hook",
                    "description": "malloc fixture commits hook 2",
                    "evidence": "fixture=2 hook=2"
                  },
                  {
                    "id": "stack-hook",
                    "number": 5,
                    "label": "stack fixture commits hook 3",
                    "mode": "RUN",
                    "event_id": "E09",
                    "strategy_ref": "run.fixtures",
                    "svg_label": "05",
                    "code_ref": "src/tasks/task01_diagnostics.c:100",
                    "snapshot_ref": "task01.stack-hook",
                    "description": "stack fixture commits hook 3",
                    "evidence": "fixture=3 hook=3"
                  },
                  {
                    "id": "deadline-hook",
                    "number": 6,
                    "label": "deadline fixture commits hook 4",
                    "mode": "RUN",
                    "event_id": "E10",
                    "strategy_ref": "run.fixtures",
                    "svg_label": "06",
                    "code_ref": "src/tasks/task01_diagnostics.c:100",
                    "snapshot_ref": "task01.deadline-hook",
                    "description": "deadline fixture commits hook 4",
                    "evidence": "fixture=4 hook=4"
                  }
                ]
              }
            ]
          }
        }
      ]
    },
    {
      "title": "A7 — Runtime proof",
      "order": 70,
      "content_kind": "prose",
      "asset_page_mode": "one-per-page",
      "page_orientation": "portrait",
      "content_tex": "The watermark is a historical minimum of unused stack, not current consumption. Three clean simulations must emit identical healthy evidence.",
      "assets": [
        {
          "path": "assets/a7-runtime.png",
          "html_path": "assets/a7-runtime.svg",
          "source_path": "assets/a7-runtime.puml",
          "caption": "A7 RUNTIME — stack, task snapshot, terminal record and identity.",
          "label": "fig:a7-runtime",
          "alt": "A7 · runtime proof",
          "kind": "diagram",
          "width": 1.0,
          "page_grid": {
            "columns": 1,
            "rows": 1,
            "page_width": 660,
            "page_height": 760,
            "overview": true,
            "step_tiles": {
              "stacks": 1,
              "hwm": 1,
              "tasks": 1,
              "fault-sp": 1,
              "abi": 1,
              "determinism": 1
            }
          },
          "interactive": {
            "kind": "uml-class",
            "storage_key": "fc12-a7-runtime",
            "title": "A7 · runtime proof",
            "task": {
              "id": "task01",
              "label": "Task01 · healthy run and fault fixtures"
            },
            "block": {
              "id": "a7",
              "label": "A7 RUNTIME",
              "description": "Runtime evidence connects the two task stacks, historical watermark, bounded task snapshot, fault SP and exact artifact identity."
            },
            "phases": [
              {
                "id": "runtime",
                "label": "RUNTIME EVIDENCE",
                "steps": [
                  {
                    "id": "stacks",
                    "number": 1,
                    "label": "worker and diagnostics SP differ",
                    "mode": "RUN",
                    "event_id": "E06",
                    "strategy_ref": "run.identity",
                    "svg_label": "01",
                    "code_ref": "src/tasks/task01_diagnostics.c:190",
                    "snapshot_ref": "task01.pass",
                    "description": "worker and diagnostics SP differ",
                    "evidence": "two task stacks"
                  },
                  {
                    "id": "hwm",
                    "number": 2,
                    "label": "watermark remains inside declared bounds",
                    "mode": "RUN",
                    "event_id": "E04",
                    "strategy_ref": "run.identity",
                    "svg_label": "02",
                    "code_ref": "src/tasks/task01_diagnostics.c:178",
                    "snapshot_ref": "task01.watermark",
                    "description": "watermark remains inside declared bounds",
                    "evidence": "0 < HWM < 256"
                  },
                  {
                    "id": "tasks",
                    "number": 3,
                    "label": "system snapshot contains all active tasks",
                    "mode": "RUN",
                    "event_id": "E05",
                    "strategy_ref": "run.identity",
                    "svg_label": "03",
                    "code_ref": "src/tasks/task01_diagnostics.c:179",
                    "snapshot_ref": "task01.snapshot",
                    "description": "system snapshot contains all active tasks",
                    "evidence": "task_count >= 3"
                  },
                  {
                    "id": "fault-sp",
                    "number": 4,
                    "label": "fault record preserves stack pointer",
                    "mode": "RUN",
                    "event_id": "E09",
                    "strategy_ref": "run.fixtures",
                    "svg_label": "04",
                    "code_ref": "src/tasks/task01_diagnostics.c:97",
                    "snapshot_ref": "task01.stack-hook",
                    "description": "fault record preserves stack pointer",
                    "evidence": "SP != 0"
                  },
                  {
                    "id": "abi",
                    "number": 5,
                    "label": "ELF exposes every diagnostic boundary",
                    "mode": "CODE",
                    "strategy_ref": "code.identity",
                    "svg_label": "05",
                    "code_ref": "scripts/check_abi.sh:17",
                    "description": "ELF exposes every diagnostic boundary",
                    "evidence": "hooks, checkpoints and task APIs"
                  },
                  {
                    "id": "determinism",
                    "number": 6,
                    "label": "three clean processes agree",
                    "mode": "RUN",
                    "event_id": "E06",
                    "strategy_ref": "run.identity",
                    "svg_label": "06",
                    "code_ref": "scripts/check_determinism.sh:12",
                    "snapshot_ref": "task01.pass",
                    "description": "three clean processes agree",
                    "evidence": "identical digest"
                  }
                ]
              }
            ]
          }
        }
      ]
    },
    {
      "title": "Task01 — healthy run and fault fixtures",
      "order": 90,
      "content_kind": "tasks",
      "task_refs": [
        "task01"
      ]
    }
  ],
  "tasks": {
    "task01": {
      "title": "Diagnose before changing the program",
      "uuid": "c3027314-85a4-5e4a-af13-0939c7467a62",
      "prompt_tex": "Odtwórz zdrowy ślad E01--E06, a potem cztery izolowane terminale E07--E10. Dla każdego zapisz, który kontrakt wykrył błąd i jakie pole rekordu to dowodzi.",
      "criterion": "Healthy PASS; four intended fault terminals; bounded evidence; deterministic artifact identity.",
      "conclusion_tex": "Diagnostyka jest wiarygodna wtedy, gdy zdrowy PASS i oczekiwane awarie mają rozłączne, mierzalne terminale oraz identyfikowalny artefakt.",
      "flow": [
        {
          "kind": "block",
          "id": "predict",
          "title": "A — przewidywanie",
          "content_tex": "Przypisz każdy błąd do właściwego mechanizmu.",
          "steps": [
            {
              "id": "contracts",
              "title": "Uzupełnij tabelę ASSERT/HOOK/MONITOR.",
              "content_tex": "Podaj kontekst wywołania i dozwolone działania."
            },
            {
              "id": "healthy",
              "title": "Zapisz zdrowe nierówności.",
              "content_tex": "Nie myl high-water mark z bieżącym użyciem stosu."
            }
          ]
        },
        {
          "kind": "block",
          "id": "replay",
          "title": "B — replay",
          "content_tex": "Uruchom zdrowy wariant i cztery fixture'y.",
          "steps": [
            {
              "id": "e01-e06",
              "title": "Zweryfikuj E01--E06.",
              "content_tex": "Heartbeat, HWM, task count, stosy i PASS."
            },
            {
              "id": "e07-e10",
              "title": "Zweryfikuj E07--E10.",
              "content_tex": "Każdy fixture ma dokładnie jeden oczekiwany terminal."
            }
          ]
        },
        {
          "kind": "exercise",
          "id": "diagnose-trace",
          "title": "Ćwiczenie — diagnoza rekordu",
          "prompt_tex": "Dostajesz rekord fault bez opisu testu. Wskaż mechanizm, prawdopodobny kontekst i pierwszy bezpieczny krok diagnostyczny bez zmiany kodu.",
          "evidence_tex": "fixture, hook, line/task, SP, committed marker oraz identyfikator ELF.",
          "criterion": "Wniosek wynika z pól rekordu; uczeń nie traktuje samego komunikatu jako dowodu.",
          "based_on": [
            "predict",
            "replay"
          ]
        }
      ],
      "educational_requirement_refs": [
        "FC12.WE01"
      ],
      "learning_effect_refs": [
        "FC12.EN01",
        "FC12.EK01"
      ],
      "assessment_criterion_ref": "FC12.KW01"
    }
  },
  "tasks_order": [
    "task01"
  ]
}