java -Xss1g -Xmx4000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCHC.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_No_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e2_704_e7_810.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8d74a04 [2018-06-22 19:10:12,996 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-22 19:10:12,999 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-22 19:10:13,013 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-22 19:10:13,014 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-22 19:10:13,015 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-22 19:10:13,016 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-22 19:10:13,018 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-22 19:10:13,019 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-22 19:10:13,020 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-22 19:10:13,021 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-22 19:10:13,022 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-22 19:10:13,022 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-22 19:10:13,023 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-22 19:10:13,026 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-22 19:10:13,027 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-22 19:10:13,029 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-22 19:10:13,038 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-22 19:10:13,039 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-22 19:10:13,040 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-22 19:10:13,041 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-22 19:10:13,046 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-22 19:10:13,046 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-22 19:10:13,046 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-22 19:10:13,047 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-22 19:10:13,048 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-22 19:10:13,049 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-22 19:10:13,049 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-22 19:10:13,050 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-22 19:10:13,051 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-22 19:10:13,051 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-22 19:10:13,052 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-22 19:10:13,052 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-22 19:10:13,053 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-22 19:10:13,053 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-22 19:10:13,054 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_No_Goto.epf [2018-06-22 19:10:13,066 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-22 19:10:13,066 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-22 19:10:13,066 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-22 19:10:13,067 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-22 19:10:13,067 INFO L131 SettingsManager]: Preferences of ChcToBoogie differ from their defaults: [2018-06-22 19:10:13,070 INFO L133 SettingsManager]: * Use one large procedure with gotos to replace tail recursive calls=false [2018-06-22 19:10:13,070 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-22 19:10:13,071 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-22 19:10:13,071 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-22 19:10:13,071 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-22 19:10:13,071 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 19:10:13,071 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-22 19:10:13,071 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-22 19:10:13,072 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-22 19:10:13,072 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-22 19:10:13,072 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-22 19:10:13,072 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-22 19:10:13,072 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-22 19:10:13,072 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-22 19:10:13,074 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-22 19:10:13,074 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-22 19:10:13,109 INFO ]: Repository-Root is: /tmp [2018-06-22 19:10:13,122 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-22 19:10:13,125 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-22 19:10:13,127 INFO ]: Initializing SmtParser... [2018-06-22 19:10:13,128 INFO ]: SmtParser initialized [2018-06-22 19:10:13,128 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e2_704_e7_810.smt2 [2018-06-22 19:10:13,129 INFO ]: Parsing .smt2 file as a set of Horn Clauses No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2018-06-22 19:10:13,216 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e2_704_e7_810.smt2 unknown [2018-06-22 19:10:13,692 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/metros_2_e2_704_e7_810.smt2 [2018-06-22 19:10:13,697 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-22 19:10:13,703 INFO ]: Walking toolchain with 4 elements. [2018-06-22 19:10:13,703 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-22 19:10:13,703 INFO ]: Initializing ChcToBoogie... [2018-06-22 19:10:13,703 INFO ]: ChcToBoogie initialized [2018-06-22 19:10:13,712 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,780 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13 Unit [2018-06-22 19:10:13,781 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-22 19:10:13,781 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-22 19:10:13,781 INFO ]: Initializing Boogie Preprocessor... [2018-06-22 19:10:13,781 INFO ]: Boogie Preprocessor initialized [2018-06-22 19:10:13,806 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,807 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,818 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,818 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,823 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,829 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,831 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... [2018-06-22 19:10:13,834 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-22 19:10:13,835 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-22 19:10:13,835 INFO ]: Initializing RCFGBuilder... [2018-06-22 19:10:13,835 INFO ]: RCFGBuilder initialized [2018-06-22 19:10:13,836 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2018-06-22 19:10:13,853 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-22 19:10:13,853 INFO ]: Found specification of procedure False [2018-06-22 19:10:13,853 INFO ]: Found implementation of procedure False [2018-06-22 19:10:13,853 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-22 19:10:13,853 INFO ]: Found specification of procedure state [2018-06-22 19:10:13,853 INFO ]: Found implementation of procedure state [2018-06-22 19:10:13,853 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-22 19:10:13,853 INFO ]: Found specification of procedure Ultimate.START [2018-06-22 19:10:13,853 INFO ]: Found implementation of procedure Ultimate.START Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 19:10:14,291 INFO ]: Using library mode [2018-06-22 19:10:14,292 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 07:10:14 BoogieIcfgContainer [2018-06-22 19:10:14,293 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-22 19:10:14,295 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-22 19:10:14,295 INFO ]: Initializing TraceAbstraction... [2018-06-22 19:10:14,303 INFO ]: TraceAbstraction initialized [2018-06-22 19:10:14,303 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 07:10:13" (1/3) ... [2018-06-22 19:10:14,303 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cdc53ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 22.06 07:10:14, skipping insertion in model container [2018-06-22 19:10:14,303 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:10:13" (2/3) ... [2018-06-22 19:10:14,304 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cdc53ab and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.06 07:10:14, skipping insertion in model container [2018-06-22 19:10:14,304 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 07:10:14" (3/3) ... [2018-06-22 19:10:14,305 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-22 19:10:14,315 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-22 19:10:14,326 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-22 19:10:14,364 INFO ]: Using default assertion order modulation [2018-06-22 19:10:14,387 INFO ]: Interprodecural is true [2018-06-22 19:10:14,387 INFO ]: Hoare is false [2018-06-22 19:10:14,387 INFO ]: Compute interpolants for FPandBP [2018-06-22 19:10:14,387 INFO ]: Backedges is TWOTRACK [2018-06-22 19:10:14,387 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-22 19:10:14,387 INFO ]: Difference is false [2018-06-22 19:10:14,388 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-22 19:10:14,388 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-22 19:10:14,398 INFO ]: Start isEmpty. Operand 13 states. [2018-06-22 19:10:14,411 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-22 19:10:14,412 INFO ]: Found error trace [2018-06-22 19:10:14,413 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:10:14,413 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:10:14,418 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-22 19:10:14,420 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:10:14,421 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:10:14,464 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:14,492 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:10:14,492 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:14,611 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:14,798 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 19:10:14,801 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-22 19:10:14,801 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-22 19:10:14,803 INFO ]: Interpolant automaton has 4 states [2018-06-22 19:10:14,815 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-22 19:10:14,815 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 19:10:14,817 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-22 19:10:14,935 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:10:14,935 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-22 19:10:14,937 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-22 19:10:14,938 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-22 19:10:14,938 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:10:14,949 INFO ]: With dead ends: 13 [2018-06-22 19:10:14,949 INFO ]: Without dead ends: 13 [2018-06-22 19:10:14,950 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 19:10:14,962 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-22 19:10:15,011 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-22 19:10:15,012 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-22 19:10:15,013 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-22 19:10:15,014 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-22 19:10:15,014 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:10:15,014 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-22 19:10:15,014 INFO ]: Interpolant automaton has 4 states. [2018-06-22 19:10:15,014 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-22 19:10:15,016 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-22 19:10:15,016 INFO ]: Found error trace [2018-06-22 19:10:15,016 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:10:15,016 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:10:15,016 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-22 19:10:15,016 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:10:15,016 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:10:15,017 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:15,017 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:10:15,017 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:15,101 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:15,418 WARN ]: Spent 123.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2018-06-22 19:10:15,522 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 19:10:15,522 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 19:10:15,522 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 19:10:15,530 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:10:15,651 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:15,662 INFO ]: Computing forward predicates... [2018-06-22 19:10:16,155 WARN ]: Spent 344.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 10 [2018-06-22 19:10:16,315 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 19:10:16,349 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 19:10:16,349 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-22 19:10:16,350 INFO ]: Interpolant automaton has 8 states [2018-06-22 19:10:16,350 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-22 19:10:16,350 INFO ]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2018-06-22 19:10:16,350 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 8 states. [2018-06-22 19:10:16,630 WARN ]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 9 [2018-06-22 19:10:17,036 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:10:17,036 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-22 19:10:17,038 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-22 19:10:17,038 INFO ]: Start accepts. Automaton has 8 states. Word has length 13 [2018-06-22 19:10:17,038 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:10:17,038 INFO ]: With dead ends: 15 [2018-06-22 19:10:17,038 INFO ]: Without dead ends: 15 [2018-06-22 19:10:17,039 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2018-06-22 19:10:17,039 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-22 19:10:17,042 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-22 19:10:17,042 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-22 19:10:17,042 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-22 19:10:17,042 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-22 19:10:17,043 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:10:17,043 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-22 19:10:17,043 INFO ]: Interpolant automaton has 8 states. [2018-06-22 19:10:17,043 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-22 19:10:17,043 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-22 19:10:17,043 INFO ]: Found error trace [2018-06-22 19:10:17,043 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:10:17,043 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:10:17,044 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-22 19:10:17,044 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:10:17,044 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:10:17,044 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:17,044 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:10:17,044 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:17,155 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:17,569 WARN ]: Spent 107.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 28 [2018-06-22 19:10:17,582 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 19:10:17,582 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 19:10:17,582 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 19:10:17,606 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-22 19:10:17,720 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 19:10:17,720 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:17,726 INFO ]: Computing forward predicates... [2018-06-22 19:10:18,095 WARN ]: Spent 155.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 31 [2018-06-22 19:10:18,200 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 19:10:18,234 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 19:10:18,234 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 13 [2018-06-22 19:10:18,234 INFO ]: Interpolant automaton has 13 states [2018-06-22 19:10:18,234 INFO ]: Constructing interpolant automaton starting with 13 interpolants. [2018-06-22 19:10:18,235 INFO ]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2018-06-22 19:10:18,235 INFO ]: Start difference. First operand 15 states and 16 transitions. Second operand 13 states. [2018-06-22 19:10:18,458 WARN ]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2018-06-22 19:10:18,851 WARN ]: Spent 338.00 ms on a formula simplification. DAG size of input: 128 DAG size of output: 119 [2018-06-22 19:10:19,068 WARN ]: Spent 183.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 78 [2018-06-22 19:10:19,110 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:10:19,111 INFO ]: Finished difference Result 17 states and 18 transitions. [2018-06-22 19:10:19,114 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-06-22 19:10:19,114 INFO ]: Start accepts. Automaton has 13 states. Word has length 17 [2018-06-22 19:10:19,114 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:10:19,115 INFO ]: With dead ends: 17 [2018-06-22 19:10:19,115 INFO ]: Without dead ends: 17 [2018-06-22 19:10:19,116 INFO ]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2018-06-22 19:10:19,116 INFO ]: Start minimizeSevpa. Operand 17 states. [2018-06-22 19:10:19,118 INFO ]: Finished minimizeSevpa. Reduced states from 17 to 17. [2018-06-22 19:10:19,118 INFO ]: Start removeUnreachable. Operand 17 states. [2018-06-22 19:10:19,119 INFO ]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-06-22 19:10:19,119 INFO ]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 17 [2018-06-22 19:10:19,119 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:10:19,119 INFO ]: Abstraction has 17 states and 18 transitions. [2018-06-22 19:10:19,119 INFO ]: Interpolant automaton has 13 states. [2018-06-22 19:10:19,119 INFO ]: Start isEmpty. Operand 17 states and 18 transitions. [2018-06-22 19:10:19,123 INFO ]: Finished isEmpty. Found accepting run of length 22 [2018-06-22 19:10:19,123 INFO ]: Found error trace [2018-06-22 19:10:19,123 INFO ]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:10:19,123 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:10:19,124 INFO ]: Analyzing trace with hash 2119922091, now seen corresponding path program 3 times [2018-06-22 19:10:19,124 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:10:19,124 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:10:19,124 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:19,124 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 19:10:19,124 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:19,227 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:19,712 WARN ]: Spent 196.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 32 [2018-06-22 19:10:19,973 WARN ]: Spent 161.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 42 [2018-06-22 19:10:20,240 WARN ]: Spent 127.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 29 [2018-06-22 19:10:20,253 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 19:10:20,253 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 19:10:20,253 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 19:10:20,266 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-22 19:10:20,409 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-06-22 19:10:20,410 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:20,416 INFO ]: Computing forward predicates... [2018-06-22 19:10:21,045 INFO ]: Checked inductivity of 21 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-06-22 19:10:21,066 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 19:10:21,066 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 17 [2018-06-22 19:10:21,067 INFO ]: Interpolant automaton has 17 states [2018-06-22 19:10:21,067 INFO ]: Constructing interpolant automaton starting with 17 interpolants. [2018-06-22 19:10:21,067 INFO ]: CoverageRelationStatistics Valid=35, Invalid=237, Unknown=0, NotChecked=0, Total=272 [2018-06-22 19:10:21,067 INFO ]: Start difference. First operand 17 states and 18 transitions. Second operand 17 states. [2018-06-22 19:10:21,305 WARN ]: Spent 142.00 ms on a formula simplification. DAG size of input: 93 DAG size of output: 92 [2018-06-22 19:10:21,609 WARN ]: Spent 257.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 98 [2018-06-22 19:10:21,829 WARN ]: Spent 187.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 102 [2018-06-22 19:10:22,009 WARN ]: Spent 145.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 75 [2018-06-22 19:10:22,057 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:10:22,103 INFO ]: Finished difference Result 19 states and 20 transitions. [2018-06-22 19:10:22,103 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-06-22 19:10:22,103 INFO ]: Start accepts. Automaton has 17 states. Word has length 21 [2018-06-22 19:10:22,104 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:10:22,104 INFO ]: With dead ends: 19 [2018-06-22 19:10:22,104 INFO ]: Without dead ends: 19 [2018-06-22 19:10:22,105 INFO ]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=90, Invalid=372, Unknown=0, NotChecked=0, Total=462 [2018-06-22 19:10:22,105 INFO ]: Start minimizeSevpa. Operand 19 states. [2018-06-22 19:10:22,108 INFO ]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-06-22 19:10:22,108 INFO ]: Start removeUnreachable. Operand 19 states. [2018-06-22 19:10:22,109 INFO ]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-06-22 19:10:22,109 INFO ]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 21 [2018-06-22 19:10:22,109 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:10:22,109 INFO ]: Abstraction has 19 states and 20 transitions. [2018-06-22 19:10:22,109 INFO ]: Interpolant automaton has 17 states. [2018-06-22 19:10:22,109 INFO ]: Start isEmpty. Operand 19 states and 20 transitions. [2018-06-22 19:10:22,110 INFO ]: Finished isEmpty. Found accepting run of length 26 [2018-06-22 19:10:22,110 INFO ]: Found error trace [2018-06-22 19:10:22,110 INFO ]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:10:22,110 INFO ]: === Iteration 5 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:10:22,111 INFO ]: Analyzing trace with hash 1762711629, now seen corresponding path program 4 times [2018-06-22 19:10:22,111 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:10:22,111 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:10:22,112 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:22,112 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 19:10:22,112 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:22,304 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:23,270 WARN ]: Spent 411.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 16 [2018-06-22 19:10:23,780 WARN ]: Spent 432.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 30 [2018-06-22 19:10:24,127 WARN ]: Spent 325.00 ms on a formula simplification. DAG size of input: 133 DAG size of output: 43 [2018-06-22 19:10:24,437 WARN ]: Spent 241.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 46 [2018-06-22 19:10:24,685 WARN ]: Spent 128.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 29 [2018-06-22 19:10:25,392 WARN ]: Spent 670.00 ms on a formula simplification. DAG size of input: 145 DAG size of output: 35 [2018-06-22 19:10:25,889 WARN ]: Spent 419.00 ms on a formula simplification. DAG size of input: 123 DAG size of output: 32 [2018-06-22 19:10:25,958 INFO ]: Checked inductivity of 36 backedges. 1 proven. 25 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-06-22 19:10:25,958 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 19:10:25,958 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 19:10:25,964 INFO ]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-06-22 19:10:26,113 INFO ]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-06-22 19:10:26,113 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:26,121 INFO ]: Computing forward predicates... [2018-06-22 19:10:26,724 INFO ]: Checked inductivity of 36 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2018-06-22 19:10:26,744 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 19:10:26,744 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 20 [2018-06-22 19:10:26,745 INFO ]: Interpolant automaton has 20 states [2018-06-22 19:10:26,745 INFO ]: Constructing interpolant automaton starting with 20 interpolants. [2018-06-22 19:10:26,745 INFO ]: CoverageRelationStatistics Valid=51, Invalid=329, Unknown=0, NotChecked=0, Total=380 [2018-06-22 19:10:26,745 INFO ]: Start difference. First operand 19 states and 20 transitions. Second operand 20 states. [2018-06-22 19:10:27,107 WARN ]: Spent 271.00 ms on a formula simplification. DAG size of input: 109 DAG size of output: 90 [2018-06-22 19:10:27,704 WARN ]: Spent 554.00 ms on a formula simplification. DAG size of input: 115 DAG size of output: 92 [2018-06-22 19:10:28,198 WARN ]: Spent 452.00 ms on a formula simplification. DAG size of input: 131 DAG size of output: 108 [2018-06-22 19:10:28,806 WARN ]: Spent 522.00 ms on a formula simplification. DAG size of input: 136 DAG size of output: 113 [2018-06-22 19:10:29,179 WARN ]: Spent 229.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 74 [2018-06-22 19:10:29,230 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:10:29,230 INFO ]: Finished difference Result 21 states and 22 transitions. [2018-06-22 19:10:29,231 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-06-22 19:10:29,231 INFO ]: Start accepts. Automaton has 20 states. Word has length 25 [2018-06-22 19:10:29,232 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:10:29,232 INFO ]: With dead ends: 21 [2018-06-22 19:10:29,232 INFO ]: Without dead ends: 21 [2018-06-22 19:10:29,233 INFO ]: 0 DeclaredPredicates, 42 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=137, Invalid=513, Unknown=0, NotChecked=0, Total=650 [2018-06-22 19:10:29,233 INFO ]: Start minimizeSevpa. Operand 21 states. [2018-06-22 19:10:29,239 INFO ]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-06-22 19:10:29,239 INFO ]: Start removeUnreachable. Operand 21 states. [2018-06-22 19:10:29,240 INFO ]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-06-22 19:10:29,240 INFO ]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 25 [2018-06-22 19:10:29,240 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:10:29,240 INFO ]: Abstraction has 21 states and 22 transitions. [2018-06-22 19:10:29,240 INFO ]: Interpolant automaton has 20 states. [2018-06-22 19:10:29,240 INFO ]: Start isEmpty. Operand 21 states and 22 transitions. [2018-06-22 19:10:29,241 INFO ]: Finished isEmpty. Found accepting run of length 30 [2018-06-22 19:10:29,241 INFO ]: Found error trace [2018-06-22 19:10:29,241 INFO ]: trace histogram [6, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:10:29,241 INFO ]: === Iteration 6 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:10:29,241 INFO ]: Analyzing trace with hash 853117551, now seen corresponding path program 5 times [2018-06-22 19:10:29,241 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:10:29,241 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:10:29,242 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:29,242 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 19:10:29,242 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:29,555 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:32,422 WARN ]: Spent 499.00 ms on a formula simplification. DAG size of input: 237 DAG size of output: 16 [2018-06-22 19:10:37,985 WARN ]: Spent 5.28 s on a formula simplification. DAG size of input: 433 DAG size of output: 44 [2018-06-22 19:10:40,067 WARN ]: Spent 1.98 s on a formula simplification. DAG size of input: 317 DAG size of output: 49 [2018-06-22 19:10:40,977 WARN ]: Spent 842.00 ms on a formula simplification. DAG size of input: 270 DAG size of output: 40 [2018-06-22 19:10:42,125 WARN ]: Spent 995.00 ms on a formula simplification. DAG size of input: 362 DAG size of output: 47 [2018-06-22 19:10:43,257 WARN ]: Spent 995.00 ms on a formula simplification. DAG size of input: 347 DAG size of output: 35 [2018-06-22 19:10:45,751 WARN ]: Spent 2.32 s on a formula simplification. DAG size of input: 464 DAG size of output: 39 [2018-06-22 19:10:48,822 WARN ]: Spent 2.81 s on a formula simplification. DAG size of input: 606 DAG size of output: 43 [2018-06-22 19:10:52,089 WARN ]: Spent 3.09 s on a formula simplification. DAG size of input: 499 DAG size of output: 28 [2018-06-22 19:10:52,111 INFO ]: Checked inductivity of 55 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-06-22 19:10:52,111 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 19:10:52,111 INFO ]: Switched to mode Z3_FP No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-06-22 19:10:52,116 INFO ]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-06-22 19:10:52,384 INFO ]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-06-22 19:10:52,384 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:10:52,393 INFO ]: Computing forward predicates... [2018-06-22 19:10:52,943 INFO ]: Checked inductivity of 55 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2018-06-22 19:10:52,963 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 19:10:52,963 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 23 [2018-06-22 19:10:52,963 INFO ]: Interpolant automaton has 23 states [2018-06-22 19:10:52,963 INFO ]: Constructing interpolant automaton starting with 23 interpolants. [2018-06-22 19:10:52,963 INFO ]: CoverageRelationStatistics Valid=53, Invalid=453, Unknown=0, NotChecked=0, Total=506 [2018-06-22 19:10:52,964 INFO ]: Start difference. First operand 21 states and 22 transitions. Second operand 23 states. [2018-06-22 19:10:53,140 WARN ]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2018-06-22 19:10:53,563 WARN ]: Spent 376.00 ms on a formula simplification. DAG size of input: 152 DAG size of output: 103 [2018-06-22 19:10:54,342 WARN ]: Spent 693.00 ms on a formula simplification. DAG size of input: 245 DAG size of output: 115 [2018-06-22 19:10:55,204 WARN ]: Spent 733.00 ms on a formula simplification. DAG size of input: 258 DAG size of output: 130 [2018-06-22 19:10:56,596 WARN ]: Spent 1.23 s on a formula simplification. DAG size of input: 238 DAG size of output: 183 [2018-06-22 19:10:57,200 WARN ]: Spent 536.00 ms on a formula simplification. DAG size of input: 187 DAG size of output: 137 [2018-06-22 19:10:57,607 WARN ]: Spent 339.00 ms on a formula simplification. DAG size of input: 135 DAG size of output: 87 [2018-06-22 19:10:57,658 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:10:57,658 INFO ]: Finished difference Result 23 states and 24 transitions. [2018-06-22 19:10:57,662 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-06-22 19:10:57,662 INFO ]: Start accepts. Automaton has 23 states. Word has length 29 [2018-06-22 19:10:57,663 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:10:57,663 INFO ]: With dead ends: 23 [2018-06-22 19:10:57,663 INFO ]: Without dead ends: 23 [2018-06-22 19:10:57,664 INFO ]: 0 DeclaredPredicates, 49 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 24.6s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2018-06-22 19:10:57,664 INFO ]: Start minimizeSevpa. Operand 23 states. [2018-06-22 19:10:57,667 INFO ]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-06-22 19:10:57,667 INFO ]: Start removeUnreachable. Operand 23 states. [2018-06-22 19:10:57,668 INFO ]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2018-06-22 19:10:57,668 INFO ]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 29 [2018-06-22 19:10:57,668 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:10:57,668 INFO ]: Abstraction has 23 states and 24 transitions. [2018-06-22 19:10:57,668 INFO ]: Interpolant automaton has 23 states. [2018-06-22 19:10:57,668 INFO ]: Start isEmpty. Operand 23 states and 24 transitions. [2018-06-22 19:10:57,669 INFO ]: Finished isEmpty. Found accepting run of length 34 [2018-06-22 19:10:57,669 INFO ]: Found error trace [2018-06-22 19:10:57,669 INFO ]: trace histogram [7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:10:57,669 INFO ]: === Iteration 7 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:10:57,669 INFO ]: Analyzing trace with hash -1661294575, now seen corresponding path program 6 times [2018-06-22 19:10:57,669 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:10:57,669 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:10:57,670 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:57,670 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-22 19:10:57,670 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:10:58,505 INFO ]: Conjunction of SSA is unsat Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown