NO Solver Timeout: 4 Global Timeout: 60 No parsing errors! Init Location: 0 Transitions: 0) /\ (arg2 > ~(1)), par{arg1 -> arg2, arg2 -> undef2}> ((~(1) * arg1) + 1), arg2 -> undef4}> 0) /\ (2 > (~(1) * arg1)), par{arg1 -> ((~(1) * arg1) - 1), arg2 -> undef6}> undef7, arg2 -> undef8}> Fresh variables: undef2, undef4, undef6, undef7, undef8, Undef variables: undef2, undef4, undef6, undef7, undef8, Abstraction variables: Exit nodes: Accepting locations: Asserts: Preprocessed LLVMGraph Init Location: 0 Transitions: 0) /\ (undef8 > ~(1))> ((~(1) * arg1) + 1)}> 0) /\ (2 > (~(1) * arg1)), par{arg1 -> ((~(1) * arg1) - 1)}> Fresh variables: undef2, undef4, undef6, undef7, undef8, Undef variables: undef2, undef4, undef6, undef7, undef8, Abstraction variables: Exit nodes: Accepting locations: Asserts: ************************************************************* ******************************************************************************************* *********************** WORKING TRANSITION SYSTEM (DAG) *********************** ******************************************************************************************* Init Location: 0 Graph 0: Transitions: Variables: Graph 1: Transitions: 1 - arg1, rest remain the same}> -1 - arg1, rest remain the same}> Variables: arg1 Precedence: Graph 0 Graph 1 Map Locations to Subgraph: ( 0 , 0 ) ( 2 , 1 ) ******************************************************************************************* ******************************** CHECKING ASSERTIONS ******************************** ******************************************************************************************* Proving termination of subgraph 0 Proving termination of subgraph 1 Checking unfeasibility... Time used: 0.002912 Checking conditional termination of SCC {l2}... LOG: CALL solveLinear LOG: RETURN solveLinear - Elapsed time: 0.000754s LOG: CALL solveLinear LOG: RETURN solveLinear - Elapsed time: 0.009330s Trying to remove transition: -1 - arg1, rest remain the same}> Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.005907s Time used: 0.005737 Trying to remove transition: 1 - arg1, rest remain the same}> Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.005076s Time used: 0.004795 Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.011568s Time used: 0.011279 Solving with 2 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.026739s Time used: 0.026121 Improving Solution with cost 1 ... LOG: CALL solveNonLinearGetNextSolution LOG: RETURN solveNonLinearGetNextSolution - Elapsed time: 0.141162s Time used: 0.141146 LOG: SAT solveNonLinear - Elapsed time: 0.167901s Cost: 1; Total time: 0.167267 Failed at location 2: arg1 <= 0 Before Improving: Quasi-invariant at l2: arg1 <= 0 Quasi-invariant at l2: 0 <= arg1 Optimizing invariants... LOG: CALL solveLinear LOG: RETURN solveLinear - Elapsed time: 0.011356s Remaining time after improvement: 0.998403 Termination implied by a set of quasi-invariant(s): Quasi-invariant at l2: arg1 <= 0 Quasi-invariant at l2: 0 <= arg1 [ Invariant Graph ] Strengthening and disabling transitions... LOG: CALL solverLinear in Graph for feasibility LOG: RETURN solveLinear in Graph for feasibility It's unfeasible. Removing transition: 1 - arg1, rest remain the same}> LOG: CALL solverLinear in Graph for feasibility LOG: RETURN solveLinear in Graph for feasibility It's unfeasible. Removing transition: -1 - arg1, rest remain the same}> [ Termination Graph ] Strengthening and disabling transitions... LOG: CALL solverLinear in Graph for feasibility LOG: RETURN solveLinear in Graph for feasibility It's unfeasible. Removing transition: 1 - arg1, rest remain the same}> LOG: CALL solverLinear in Graph for feasibility LOG: RETURN solveLinear in Graph for feasibility It's unfeasible. Removing transition: -1 - arg1, rest remain the same}> New Graphs: Calling Safety with literal arg1 <= 0 and entry LOG: CALL check - Post:arg1 <= 0 - Process 1 * Exit transition: * Postcondition : arg1 <= 0 LOG: CALL solveLinear LOG: RETURN solveLinear - Elapsed time: 0.000602s > Postcondition is not implied! LOG: RETURN check - Elapsed time: 0.000696s INVARIANTS: 2: Quasi-INVARIANTS to narrow Graph: 2: arg1 <= 0 , 0 <= arg1 , Narrowing transition: 1 - arg1, rest remain the same}> LOG: Narrow transition size 2 Narrowing transition: -1 - arg1, rest remain the same}> LOG: Narrow transition size 2 invGraph after Narrowing: Transitions: 1 - arg1, rest remain the same}> -1 - arg1, rest remain the same}> Variables: arg1 Checking conditional termination of SCC {l2}... LOG: CALL solveLinear LOG: RETURN solveLinear - Elapsed time: 0.000719s LOG: CALL solveLinear LOG: RETURN solveLinear - Elapsed time: 0.009251s Trying to remove transition: -1 - arg1, rest remain the same}> Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.005480s Time used: 0.005323 Trying to remove transition: 1 - arg1, rest remain the same}> Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.005148s Time used: 0.004865 Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.010232s Time used: 0.009949 Solving with 2 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 4.001075s Time used: 4.0008 Solving with 3 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 1.010753s Time used: 1.00049 Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.015639s Time used: 0.009619 Proving non-termination of subgraph 1 Transitions: 1 - arg1, rest remain the same}> -1 - arg1, rest remain the same}> Variables: arg1 Checking conditional non-termination of SCC {l2}... EXIT TRANSITIONS: Solving with 1 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 0.004594s Time used: 0.004494 Solving with 2 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 5.001464s Time used: 5.00141 Solving with 3 template(s). LOG: CALL solveNonLinearGetFirstSolution LOG: RETURN solveNonLinearGetFirstSolution - Elapsed time: 5.006185s Time used: 5.00114 > Checking if the negation of the conditions of every pending exit is quasi-invariant... YES Calling reachability with... Transition: Conditions: 0 <= arg1, 1 <= arg1, Transition: Conditions: 1 + arg1 <= 0, arg1 <= 0, OPEN EXITS: --- Reachability graph --- > Graph without transitions. Calling reachability with... Transition: Conditions: 1 <= arg1, Transition: Conditions: 1 + arg1 <= 0, OPEN EXITS: > Conditions are reachable! Program does NOT terminate