ℹ [2/12] Replayed Confirmation
info: verify/lean/./././Confirmation.lean:195:0: 'Confirmation.authorized_target_is_bound' depends on axioms: [propext]
info: verify/lean/./././Confirmation.lean:196:0: 'Confirmation.confirm_refines_step' does not depend on any axioms
info: verify/lean/./././Confirmation.lean:197:0: 'Confirmation.reachable_safe' depends on axioms: [propext, Classical.choice, Quot.sound]
info: verify/lean/./././Confirmation.lean:198:0: 'Confirmation.at_most_one_write' depends on axioms: [propext, Classical.choice, Quot.sound]
info: verify/lean/./././Confirmation.lean:199:0: 'Confirmation.burn_blocks_future_reserve' depends on axioms: [propext, Classical.choice, Quot.sound]
ℹ [4/12] Replayed Client.Requests
info: verify/lean/./././Client/Requests.lean:38:0: 'Client.Requests.semaphore_bound' depends on axioms: [propext, Quot.sound]
info: verify/lean/./././Client/Requests.lean:39:0: 'Client.Requests.retry_variant_decreases' depends on axioms: [propext, Quot.sound]
ℹ [5/12] Replayed Client.Lifecycle
info: verify/lean/./././Client/Lifecycle.lean:40:0: 'Client.Lifecycle.selected_owner_is_running' depends on axioms: [propext, Quot.sound]
ℹ [6/12] Replayed Client.Pagination
info: verify/lean/./././Client/Pagination.lean:54:0: 'Client.Pagination.no_duplicate_page' depends on axioms: [propext]
info: verify/lean/./././Client/Pagination.lean:55:0: 'Client.Pagination.budget_conserved' depends on axioms: [propext, Quot.sound]
info: verify/lean/./././Client/Pagination.lean:56:0: 'Client.Pagination.follows_server_successor' depends on axioms: [propext]
ℹ [9/12] Replayed Grading.Retry
info: verify/lean/./././Grading/Retry.lean:74:0: 'Grading.Retry.at_most_one_write' depends on axioms: [propext, Quot.sound]
info: verify/lean/./././Grading/Retry.lean:75:0: 'Grading.Retry.reads_at_most_four_attempts' depends on axioms: [propext, Quot.sound]
ℹ [10/12] Replayed Grading.Scheduler
info: lean/./././Grading/Scheduler.lean:86:0: 'Grading.Scheduler.reachable_safe' depends on axioms: [propext, Classical.choice, Quot.sound]
info: lean/./././Grading/Scheduler.lean:87:0: 'Grading.Scheduler.no_duplicate_dispatch' depends on axioms: [propext, Classical.choice, Quot.sound]
info: lean/./././Grading/Scheduler.lean:88:0: 'Grading.Scheduler.in_flight_cap' depends on axioms: [propext, Classical.choice, Quot.sound]
Build completed successfully.
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 67 and seed 7860922925822586278 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 18] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/Confirmation.tla
Parsing file /tmp/tlc-4255401026481235188/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-4255401026481235188/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Parsing file /tmp/tlc-4255401026481235188/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module Confirmation
Linting of module Confirmation
Starting... (2026-09-23 19:48:17)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:17.
Error: Invariant NoBurnReplay is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ replay = FALSE
/\ burned = FALSE
/\ held = FALSE
/\ burnedEver = FALSE
/\ pc = (a :> "idle" @@ b :> "idle" @@ c :> "idle")
/\ writes = 0

State 2: <Check(a) line 9, col 13 to line 11, col 69 of module Confirmation>
/\ replay = FALSE
/\ burned = FALSE
/\ held = FALSE
/\ burnedEver = FALSE
/\ pc = (a :> "checked" @@ b :> "idle" @@ c :> "idle")
/\ writes = 0

State 3: <Reserve(a) line 12, col 15 to line 15, col 57 of module Confirmation>
/\ replay = FALSE
/\ burned = FALSE
/\ held = TRUE
/\ burnedEver = FALSE
/\ pc = (a :> "inflight" @@ b :> "idle" @@ c :> "idle")
/\ writes = 0

State 4: <Mismatch(b) line 19, col 16 to line 21, col 50 of module Confirmation>
/\ replay = FALSE
/\ burned = FALSE
/\ held = TRUE
/\ burnedEver = TRUE
/\ pc = (a :> "inflight" @@ b :> "idle" @@ c :> "idle")
/\ writes = 0

State 5: <Release(a) line 22, col 15 to line 25, col 65 of module Confirmation>
/\ replay = FALSE
/\ burned = FALSE
/\ held = FALSE
/\ burnedEver = TRUE
/\ pc = (a :> "idle" @@ b :> "idle" @@ c :> "idle")
/\ writes = 0

State 6: <Check(a) line 9, col 13 to line 11, col 69 of module Confirmation>
/\ replay = FALSE
/\ burned = FALSE
/\ held = FALSE
/\ burnedEver = TRUE
/\ pc = (a :> "checked" @@ b :> "idle" @@ c :> "idle")
/\ writes = 0

State 7: <Reserve(a) line 12, col 15 to line 15, col 57 of module Confirmation>
/\ replay = TRUE
/\ burned = FALSE
/\ held = TRUE
/\ burnedEver = TRUE
/\ pc = (a :> "inflight" @@ b :> "idle" @@ c :> "idle")
/\ writes = 0

173 states generated, 62 distinct states found, 11 states left on queue.
The depth of the complete state graph search is 7.
Finished in 00s at (2026-09-23 19:48:17)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 89 and seed -3522290733243118820 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 41] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/Confirmation.tla
Parsing file /tmp/tlc-15829729273615506854/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-15829729273615506854/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Parsing file /tmp/tlc-15829729273615506854/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module Confirmation
Linting of module Confirmation
Starting... (2026-09-23 19:48:18)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:18.
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 3.9E-16
184 states generated, 57 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 6.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 4 and the 95th percentile is 4).
Finished in 00s at (2026-09-23 19:48:18)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 123 and seed 3013641886263935117 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 64] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/Clock.tla
Parsing file /tmp/tlc-7919705253499929944/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module Clock
Linting of module Clock
Starting... (2026-09-23 19:48:19)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:19.
Error: Invariant NoDoubleRedeem is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ now = 0
/\ spent = FALSE
/\ redemptions = 0
/\ expiredSuccess = FALSE

State 2: <Reserve(0) line 16, col 5 to line 22, col 65 of module Clock>
/\ now = 0
/\ spent = TRUE
/\ redemptions = 1
/\ expiredSuccess = FALSE

State 3: <Reserve(2) line 16, col 5 to line 22, col 65 of module Clock>
/\ now = 2
/\ spent = TRUE
/\ redemptions = 2
/\ expiredSuccess = TRUE

18 states generated, 8 distinct states found, 3 states left on queue.
The depth of the complete state graph search is 3.
Finished in 00s at (2026-09-23 19:48:19)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 58 and seed 5735006150042056110 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 87] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/Clock.tla
Parsing file /tmp/tlc-14239134353157108733/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module Clock
Linting of module Clock
Starting... (2026-09-23 19:48:19)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:20.
Error: Invariant NoDoubleRedeem is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ now = 0
/\ spent = FALSE
/\ redemptions = 0
/\ expiredSuccess = FALSE

State 2: <Reserve(0) line 16, col 5 to line 22, col 65 of module Clock>
/\ now = 0
/\ spent = TRUE
/\ redemptions = 1
/\ expiredSuccess = FALSE

State 3: <Observe(2) line 10, col 17 to line 13, col 60 of module Clock>
/\ now = 2
/\ spent = FALSE
/\ redemptions = 1
/\ expiredSuccess = FALSE

State 4: <Observe(0) line 10, col 17 to line 13, col 60 of module Clock>
/\ now = 0
/\ spent = FALSE
/\ redemptions = 1
/\ expiredSuccess = FALSE

State 5: <Reserve(0) line 16, col 5 to line 22, col 65 of module Clock>
/\ now = 0
/\ spent = TRUE
/\ redemptions = 2
/\ expiredSuccess = FALSE

40 states generated, 9 distinct states found, 1 states left on queue.
The depth of the complete state graph search is 5.
Finished in 00s at (2026-09-23 19:48:20)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 73 and seed -2507236865319936703 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 110] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/Clock.tla
Parsing file /tmp/tlc-11392788460462757056/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module Clock
Linting of module Clock
Starting... (2026-09-23 19:48:20)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:20.
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 8.8E-18
33 states generated, 6 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 3.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 3 and the 95th percentile is 3).
Finished in 00s at (2026-09-23 19:48:20)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 89 and seed 8254976147923383113 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 133] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientRequests.tla
Parsing file /tmp/tlc-15604802564472223388/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-15604802564472223388/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Parsing file /tmp/tlc-15604802564472223388/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module ClientRequests
Linting of module ClientRequests
Starting... (2026-09-23 19:48:21)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:21.
Error: Invariant OwnedClientClosed is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ attempts = (a :> 0 @@ b :> 0 @@ c :> 0)
/\ closed = (a :> FALSE @@ b :> FALSE @@ c :> FALSE)
/\ pc = (a :> "queued" @@ b :> "queued" @@ c :> "queued")

State 2: <Cancel(a) line 24, col 14 to line 27, col 34 of module ClientRequests>
/\ attempts = (a :> 0 @@ b :> 0 @@ c :> 0)
/\ closed = (a :> FALSE @@ b :> FALSE @@ c :> FALSE)
/\ pc = (a :> "done" @@ b :> "queued" @@ c :> "queued")

3 states generated, 3 distinct states found, 1 states left on queue.
The depth of the complete state graph search is 2.
Finished in 00s at (2026-09-23 19:48:21)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 89 and seed -7606086977879304288 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 156] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientRequests.tla
Parsing file /tmp/tlc-10213816682875672269/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-10213816682875672269/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Parsing file /tmp/tlc-10213816682875672269/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module ClientRequests
Linting of module ClientRequests
Starting... (2026-09-23 19:48:22)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:22.
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 6.2E-13
7321 states generated, 2232 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 28.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 6 and the 95th percentile is 2).
Finished in 00s at (2026-09-23 19:48:22)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 60 and seed 1384381286356525585 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 180] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientCleanup.tla
Parsing file /tmp/tlc-7197120237633404998/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module ClientCleanup
Linting of module ClientCleanup
Starting... (2026-09-23 19:48:22)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:22.
Error: Invariant ReplacementPreserved is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ replaced = FALSE
/\ phase = "idle"
/\ cache = 1

State 2: <Start line 7, col 10 to line 9, col 30 of module ClientCleanup>
/\ replaced = FALSE
/\ phase = "waiting"
/\ cache = 1

State 3: <Replace line 10, col 12 to line 11, col 63 of module ClientCleanup>
/\ replaced = TRUE
/\ phase = "waiting"
/\ cache = 2

State 4: <Finish line 12, col 11 to line 14, col 31 of module ClientCleanup>
/\ replaced = TRUE
/\ phase = "done"
/\ cache = 0

5 states generated, 5 distinct states found, 1 states left on queue.
The depth of the complete state graph search is 4.
Finished in 00s at (2026-09-23 19:48:22)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 99 and seed 6805505564280101725 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 203] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientCleanup.tla
Parsing file /tmp/tlc-14376234105210445144/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module ClientCleanup
Linting of module ClientCleanup
Starting... (2026-09-23 19:48:23)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:23.
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
5 states generated, 5 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 4.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 2 and the 95th percentile is 2).
Finished in 00s at (2026-09-23 19:48:23)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 115 and seed 3664689995991793803 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 225] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientDispatch.tla
Parsing file /tmp/tlc-1012646370689511582/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module ClientDispatch
Linting of module ClientDispatch
Starting... (2026-09-23 19:48:23)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:24.
Error: Invariant DispatchOpen is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ bad = FALSE
/\ closed = {}
/\ dispatched = FALSE
/\ cache = 1
/\ cleaned = FALSE

State 2: <Cleanup line 9, col 12 to line 11, col 43 of module ClientDispatch>
/\ bad = FALSE
/\ closed = {1}
/\ dispatched = FALSE
/\ cache = 0
/\ cleaned = TRUE

State 3: <Dispatch line 12, col 13 to line 16, col 44 of module ClientDispatch>
/\ bad = TRUE
/\ closed = {1}
/\ dispatched = TRUE
/\ cache = 0
/\ cleaned = TRUE

4 states generated, 4 distinct states found, 1 states left on queue.
The depth of the complete state graph search is 3.
Finished in 00s at (2026-09-23 19:48:24)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 26 and seed -7785263268588562835 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 247] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientDispatch.tla
Parsing file /tmp/tlc-3045132742117563803/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module ClientDispatch
Linting of module ClientDispatch
Starting... (2026-09-23 19:48:24)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:24.
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
5 states generated, 5 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 3.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 2 and the 95th percentile is 2).
Finished in 00s at (2026-09-23 19:48:24)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 26 and seed -758919809082438364 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 269] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientPagination.tla
Parsing file /tmp/tlc-11826314200899481460/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-11826314200899481460/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-11826314200899481460/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module ClientPagination
Linting of module ClientPagination
Starting... (2026-09-23 19:48:24)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:25.
Error: Invariant NoSkippedSuccessor is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ phase = (a :> "active" @@ b :> "active")
/\ pages = (a :> <<>> @@ b :> <<>>)
/\ cursor = (a :> 1 @@ b :> 1)

State 2: <Fetch(a) line 11, col 13 to line 18, col 99 of module ClientPagination>
/\ phase = (a :> "done" @@ b :> "active")
/\ pages = (a :> <<1>> @@ b :> <<>>)
/\ cursor = (a :> 2 @@ b :> 1)

2 states generated, 2 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 2.
Finished in 00s at (2026-09-23 19:48:25)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 60 and seed 999164079912762904 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 292] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientPagination.tla
Parsing file /tmp/tlc-10489266747309147622/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-10489266747309147622/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-10489266747309147622/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module ClientPagination
Linting of module ClientPagination
Starting... (2026-09-23 19:48:25)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:25.
Progress(5) at 2026-09-23 19:48:25: 13 states generated, 9 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 9 total distinct states at (2026-09-23 19:48:25)
Finished checking temporal properties in 00s at 2026-09-23 19:48:25
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 2.0E-18
13 states generated, 9 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 5.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 2 and the 95th percentile is 2).
Finished in 00s at (2026-09-23 19:48:25)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 10 and seed -836442841587559150 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 316] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientPagination.tla
Parsing file /tmp/tlc-16498533997491070081/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-16498533997491070081/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-16498533997491070081/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module ClientPagination
Linting of module ClientPagination
Starting... (2026-09-23 19:48:26)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:26.
Progress(5) at 2026-09-23 19:48:26: 13 states generated, 9 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 9 total distinct states at (2026-09-23 19:48:26)
Finished checking temporal properties in 00s at 2026-09-23 19:48:26
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 2.0E-18
13 states generated, 9 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 5.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 2 and the 95th percentile is 2).
Finished in 00s at (2026-09-23 19:48:26)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 27 and seed 7668235448134644562 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 340] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientPageBudget.tla
Parsing file /tmp/tlc-15914795239581939818/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module ClientPageBudget
Linting of module ClientPageBudget
Starting... (2026-09-23 19:48:26)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:26.
Progress(2) at 2026-09-23 19:48:26: 3 states generated, 2 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 2 total distinct states at (2026-09-23 19:48:26)
Error: Temporal property Termination was violated.

Error: The following behavior constitutes a counter-example:

State 1: <Initial predicate>
/\ done = FALSE
/\ remaining = 3
/\ tick = FALSE

State 2: <More line 9, col 9 to line 11, col 43 of module ClientPageBudget>
/\ done = FALSE
/\ remaining = 3
/\ tick = TRUE

Back to state 1: <More line 9, col 9 to line 11, col 43 of module ClientPageBudget>

Finished checking temporal properties in 00s at 2026-09-23 19:48:26
3 states generated, 2 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 2.
Finished in 00s at (2026-09-23 19:48:26)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 9 and seed -5836425498699182824 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 365] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/ClientPageBudget.tla
Parsing file /tmp/tlc-3199708793018407371/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module ClientPageBudget
Linting of module ClientPageBudget
Starting... (2026-09-23 19:48:27)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:27.
Progress(4) at 2026-09-23 19:48:27: 4 states generated, 4 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 4 total distinct states at (2026-09-23 19:48:27)
Finished checking temporal properties in 00s at 2026-09-23 19:48:27
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
4 states generated, 4 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 4.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 1 and the 95th percentile is 1).
Finished in 00s at (2026-09-23 19:48:27)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 64 and seed 2234859834224018730 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 389] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingRedirect.tla
Parsing file /tmp/tlc-2299581436745062080/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module GradingRedirect
Linting of module GradingRedirect
Starting... (2026-09-23 19:48:27)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:27.
Error: Invariant OneWrite is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ pc = "send"
/\ commits = 0

State 2: <Apply line 7, col 10 to line 7, col 69 of module GradingRedirect>
/\ pc = "response"
/\ commits = 1

State 3: <Redirect line 10, col 13 to line 12, col 32 of module GradingRedirect>
/\ pc = "send"
/\ commits = 1

State 4: <Apply line 7, col 10 to line 7, col 69 of module GradingRedirect>
/\ pc = "response"
/\ commits = 2

4 states generated, 4 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 4.
Finished in 00s at (2026-09-23 19:48:27)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 42 and seed -1193940263485635695 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 412] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingRedirect.tla
Parsing file /tmp/tlc-1796672900140439050/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module GradingRedirect
Linting of module GradingRedirect
Starting... (2026-09-23 19:48:28)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:28.
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
3 states generated, 3 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 3.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 1 and the 95th percentile is 1).
Finished in 00s at (2026-09-23 19:48:28)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 23 and seed -582866143406012449 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 434] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingStride.tla
Parsing file /tmp/tlc-12736345153964240503/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module GradingStride
Linting of module GradingStride
Starting... (2026-09-23 19:48:28)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:28.
Error: Invariant CapRespected is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ rejected = FALSE
/\ offset2 = 0
/\ active = 0

State 2: <Admit line 9, col 10 to line 12, col 30 of module GradingStride>
/\ rejected = FALSE
/\ offset2 = 3
/\ active = 1

State 3: <Finish line 13, col 11 to line 13, col 73 of module GradingStride>
/\ rejected = FALSE
/\ offset2 = 3
/\ active = 0

State 4: <Admit line 9, col 10 to line 12, col 30 of module GradingStride>
/\ rejected = FALSE
/\ offset2 = 6
/\ active = 2

4 states generated, 4 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 4.
Finished in 00s at (2026-09-23 19:48:28)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 9 and seed 4692726626831010524 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 456] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingStride.tla
Parsing file /tmp/tlc-8888814601344325771/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module GradingStride
Linting of module GradingStride
Starting... (2026-09-23 19:48:29)
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:29.
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
1 states generated, 1 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 1.
The average outdegree of the complete state graph is 0 (minimum is 0, the maximum 0 and the 95th percentile is 0).
Finished in 00s at (2026-09-23 19:48:29)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 108 and seed 4993833147961737225 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 479] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingRetry.tla
Parsing file /tmp/tlc-9831400872248761613/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module GradingRetry
Linting of module GradingRetry
Starting... (2026-09-23 19:48:29)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:29.
Error: Invariant OneWrite is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ attempts = 0
/\ pc = "ready"
/\ commits = 0

State 2: <Dispatch line 7, col 13 to line 10, col 32 of module GradingRetry>
/\ attempts = 1
/\ pc = "remote"
/\ commits = 0

State 3: <Remote line 12, col 11 to line 15, col 31 of module GradingRetry>
/\ attempts = 1
/\ pc = "response"
/\ commits = 1

State 4: <Response line 16, col 13 to line 19, col 46 of module GradingRetry>
/\ attempts = 1
/\ pc = "backoff"
/\ commits = 1

State 5: <Wake line 20, col 9 to line 21, col 42 of module GradingRetry>
/\ attempts = 1
/\ pc = "ready"
/\ commits = 1

State 6: <Dispatch line 7, col 13 to line 10, col 32 of module GradingRetry>
/\ attempts = 2
/\ pc = "remote"
/\ commits = 1

State 7: <Remote line 12, col 11 to line 15, col 31 of module GradingRetry>
/\ attempts = 2
/\ pc = "response"
/\ commits = 2

16 states generated, 15 distinct states found, 2 states left on queue.
The depth of the complete state graph search is 7.
Finished in 00s at (2026-09-23 19:48:29)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 53 and seed 8869684027460243406 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 502] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingRetry.tla
Parsing file /tmp/tlc-8811313098575462382/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module GradingRetry
Linting of module GradingRetry
Starting... (2026-09-23 19:48:30)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:30.
Progress(4) at 2026-09-23 19:48:30: 6 states generated, 6 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 6 total distinct states at (2026-09-23 19:48:30)
Finished checking temporal properties in 00s at 2026-09-23 19:48:30
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
6 states generated, 6 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 4.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 2 and the 95th percentile is 2).
Finished in 00s at (2026-09-23 19:48:30)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 27 and seed -1751042848961378457 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 526] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingRetry.tla
Parsing file /tmp/tlc-10275259950851147987/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Semantic processing of module Naturals
Semantic processing of module GradingRetry
Linting of module GradingRetry
Starting... (2026-09-23 19:48:30)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:30.
Progress(16) at 2026-09-23 19:48:30: 19 states generated, 19 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 19 total distinct states at (2026-09-23 19:48:30)
Finished checking temporal properties in 00s at 2026-09-23 19:48:30
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
19 states generated, 19 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 16.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 2 and the 95th percentile is 2).
Finished in 00s at (2026-09-23 19:48:30)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 38 and seed 6259369587405457376 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 550] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingBatch.tla
Parsing file /tmp/tlc-3803100122124528795/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-3803100122124528795/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-3803100122124528795/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module GradingBatch
Linting of module GradingBatch
Starting... (2026-09-23 19:48:31)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:31.
Error: Invariant NoDoubleGrade is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ rejected = FALSE
/\ target = <<1, 1>>
/\ waiting = FALSE
/\ pc = <<"queued", "queued">>
/\ sleeps = 0
/\ writes = <<0>>
/\ offset = 1

State 2: <Admit line 42, col 10 to line 42, col 63 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 1>>
/\ waiting = FALSE
/\ pc = <<"callback", "callback">>
/\ sleeps = 0
/\ writes = <<0>>
/\ offset = 3

State 3: <Callback(1) line 20, col 16 to line 23, col 73 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 1>>
/\ waiting = FALSE
/\ pc = <<"request", "callback">>
/\ sleeps = 0
/\ writes = <<0>>
/\ offset = 3

State 4: <Send(1) line 24, col 12 to line 27, col 69 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 1>>
/\ waiting = FALSE
/\ pc = <<"remote", "callback">>
/\ sleeps = 0
/\ writes = <<1>>
/\ offset = 3

State 5: <Callback(2) line 20, col 16 to line 23, col 73 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 1>>
/\ waiting = FALSE
/\ pc = <<"remote", "request">>
/\ sleeps = 0
/\ writes = <<1>>
/\ offset = 3

State 6: <Send(2) line 24, col 12 to line 27, col 69 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 1>>
/\ waiting = FALSE
/\ pc = <<"remote", "remote">>
/\ sleeps = 0
/\ writes = <<2>>
/\ offset = 3

30 states generated, 21 distinct states found, 6 states left on queue.
The depth of the complete state graph search is 6.
Finished in 00s at (2026-09-23 19:48:31)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 28 and seed 3214915572734720043 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 573] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingBatch.tla
Parsing file /tmp/tlc-6314950755458420069/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-6314950755458420069/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-6314950755458420069/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module GradingBatch
Linting of module GradingBatch
Starting... (2026-09-23 19:48:32)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:32.
Progress(1) at 2026-09-23 19:48:32: 1 states generated, 1 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 1 total distinct states at (2026-09-23 19:48:32)
Finished checking temporal properties in 00s at 2026-09-23 19:48:32
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 0.0
1 states generated, 1 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 1.
The average outdegree of the complete state graph is 0 (minimum is 0, the maximum 0 and the 95th percentile is 0).
Finished in 00s at (2026-09-23 19:48:32)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 130 and seed -8922243820138278900 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 597] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingBatch.tla
Parsing file /tmp/tlc-17792166423653741162/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-17792166423653741162/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-17792166423653741162/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module GradingBatch
Linting of module GradingBatch
Starting... (2026-09-23 19:48:32)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:32.
Progress(17) at 2026-09-23 19:48:32: 214 states generated, 134 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 134 total distinct states at (2026-09-23 19:48:32)
Finished checking temporal properties in 00s at 2026-09-23 19:48:32
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 5.8E-16
214 states generated, 134 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 17.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 4 and the 95th percentile is 3).
Finished in 00s at (2026-09-23 19:48:32)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 127 and seed 7301650610433942895 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 622] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingBatch.tla
Parsing file /tmp/tlc-306607820074347135/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-306607820074347135/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-306607820074347135/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module GradingBatch
Linting of module GradingBatch
Starting... (2026-09-23 19:48:33)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:33.
Error: Invariant NoDoubleGrade is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"queued", "queued", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<0, 0, 0, 0>>
/\ offset = 1

State 2: <Admit line 42, col 10 to line 42, col 63 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"callback", "callback", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<0, 0, 0, 0>>
/\ offset = 3

State 3: <Callback(1) line 20, col 16 to line 23, col 73 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"request", "callback", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<0, 0, 0, 0>>
/\ offset = 3

State 4: <Send(1) line 24, col 12 to line 27, col 69 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"remote", "callback", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<1, 0, 0, 0>>
/\ offset = 3

State 5: <Callback(2) line 20, col 16 to line 23, col 73 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 1, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"remote", "request", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<1, 0, 0, 0>>
/\ offset = 3

State 6: <Send(2) line 24, col 12 to line 27, col 69 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 1, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"remote", "remote", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<2, 0, 0, 0>>
/\ offset = 3

31 states generated, 22 distinct states found, 7 states left on queue.
The depth of the complete state graph search is 6.
Finished in 00s at (2026-09-23 19:48:33)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 46 and seed -6607280888999475641 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 645] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingBatch.tla
Parsing file /tmp/tlc-15026468524410838595/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-15026468524410838595/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-15026468524410838595/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module GradingBatch
Linting of module GradingBatch
Starting... (2026-09-23 19:48:34)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:34.
Progress(17) at 2026-09-23 19:48:34: 214 states generated, 134 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 134 total distinct states at (2026-09-23 19:48:34)
Finished checking temporal properties in 00s at 2026-09-23 19:48:34
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 5.8E-16
214 states generated, 134 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 17.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 4 and the 95th percentile is 3).
Finished in 00s at (2026-09-23 19:48:34)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 88 and seed -2298114322445999061 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 670] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingBatch.tla
Parsing file /tmp/tlc-15198135487748061115/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-15198135487748061115/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-15198135487748061115/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module GradingBatch
Linting of module GradingBatch
Starting... (2026-09-23 19:48:34)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:35.
Error: Invariant ZeroDelay is violated.
Error: The behavior up to this point is:
State 1: <Initial predicate>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"queued", "queued", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<0, 0, 0, 0>>
/\ offset = 1

State 2: <Admit line 42, col 10 to line 42, col 63 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"callback", "callback", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<0, 0, 0, 0>>
/\ offset = 3

State 3: <Callback(1) line 20, col 16 to line 23, col 73 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"done", "callback", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<0, 0, 0, 0>>
/\ offset = 3

State 4: <Callback(2) line 20, col 16 to line 23, col 73 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = FALSE
/\ pc = <<"done", "done", "queued", "queued">>
/\ sleeps = 0
/\ writes = <<0, 0, 0, 0>>
/\ offset = 3

State 5: <BatchSettled line 32, col 17 to line 37, col 69 of module GradingBatch>
/\ rejected = FALSE
/\ target = <<1, 2, 3, 4>>
/\ waiting = TRUE
/\ pc = <<"done", "done", "queued", "queued">>
/\ sleeps = 1
/\ writes = <<0, 0, 0, 0>>
/\ offset = 3

24 states generated, 18 distinct states found, 6 states left on queue.
The depth of the complete state graph search is 5.
Finished in 00s at (2026-09-23 19:48:35)
TLC2 Version 2026.09.22.222048 (rev: 35d40c9)
Running breadth-first search Model-Checking with fp 37 and seed -8850090255129962286 with 1 worker on 8 cores with 4551MB heap and 64MB offheap memory [pid: 693] (Linux 6.18.44 amd64, Ubuntu 17.0.20 64bit, MSBDiskFPSet, DiskStateQueue).
Parsing file /workspace/scratch/5655cab44c80/canvas-mcp-ts-grading/verify/tla/GradingBatch.tla
Parsing file /tmp/tlc-7096650063693370628/Naturals.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Naturals.tla)
Parsing file /tmp/tlc-7096650063693370628/Sequences.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/Sequences.tla)
Parsing file /tmp/tlc-7096650063693370628/FiniteSets.tla (jar:file:/workspace/scratch/5655cab44c80/tla2tools.jar!/tla2sany/StandardModules/FiniteSets.tla)
Semantic processing of module Naturals
Semantic processing of module Sequences
Semantic processing of module FiniteSets
Semantic processing of module GradingBatch
Linting of module GradingBatch
Starting... (2026-09-23 19:48:35)
Implied-temporal checking--satisfiability problem has 1 branches.
Computing initial states...
Finished computing initial states: 1 distinct state generated at 2026-09-23 19:48:35.
Progress(17) at 2026-09-23 19:48:35: 214 states generated, 134 distinct states found, 0 states left on queue.
Checking temporal properties for the complete state space with 134 total distinct states at (2026-09-23 19:48:35)
Finished checking temporal properties in 00s at 2026-09-23 19:48:35
Model checking completed. No error has been found.
  Estimates of the probability that TLC did not check all reachable states
  because two distinct states had the same fingerprint:
  calculated (optimistic):  val = 5.8E-16
214 states generated, 134 distinct states found, 0 states left on queue.
The depth of the complete state graph search is 17.
The average outdegree of the complete state graph is 1 (minimum is 0, the maximum 4 and the 95th percentile is 3).
Finished in 00s at (2026-09-23 19:48:35)
