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/swimmingpool_6.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-8d74a04 [2018-06-22 19:59:03,756 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-22 19:59:03,759 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-22 19:59:03,772 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-22 19:59:03,772 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-22 19:59:03,773 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-22 19:59:03,775 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-22 19:59:03,780 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-22 19:59:03,781 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-22 19:59:03,782 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-22 19:59:03,783 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-22 19:59:03,783 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-22 19:59:03,785 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-22 19:59:03,787 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-22 19:59:03,787 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-22 19:59:03,788 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-22 19:59:03,792 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-22 19:59:03,795 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-22 19:59:03,808 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-22 19:59:03,809 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-22 19:59:03,810 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-22 19:59:03,813 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-22 19:59:03,813 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-22 19:59:03,813 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-22 19:59:03,814 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-22 19:59:03,815 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-22 19:59:03,815 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-22 19:59:03,822 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-22 19:59:03,823 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-22 19:59:03,823 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-22 19:59:03,824 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-22 19:59:03,824 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-22 19:59:03,824 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-22 19:59:03,825 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-22 19:59:03,826 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-22 19:59:03,826 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 19:59:03,839 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-22 19:59:03,840 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-22 19:59:03,840 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-22 19:59:03,840 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-22 19:59:03,841 INFO L131 SettingsManager]: Preferences of ChcToBoogie differ from their defaults: [2018-06-22 19:59:03,841 INFO L133 SettingsManager]: * Use one large procedure with gotos to replace tail recursive calls=false [2018-06-22 19:59:03,842 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-22 19:59:03,842 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-22 19:59:03,842 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-22 19:59:03,842 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-22 19:59:03,842 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-22 19:59:03,842 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-22 19:59:03,843 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-22 19:59:03,843 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-22 19:59:03,843 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-22 19:59:03,843 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-22 19:59:03,843 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-22 19:59:03,844 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-22 19:59:03,844 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-22 19:59:03,850 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-22 19:59:03,850 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-22 19:59:03,907 INFO ]: Repository-Root is: /tmp [2018-06-22 19:59:03,922 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-22 19:59:03,927 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-22 19:59:03,928 INFO ]: Initializing SmtParser... [2018-06-22 19:59:03,928 INFO ]: SmtParser initialized [2018-06-22 19:59:03,929 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/lustre/swimmingpool_6.smt2 [2018-06-22 19:59:03,931 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 19:59:04,019 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/swimmingpool_6.smt2 unknown [2018-06-22 19:59:04,525 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/lustre/swimmingpool_6.smt2 [2018-06-22 19:59:04,536 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-22 19:59:04,541 INFO ]: Walking toolchain with 4 elements. [2018-06-22 19:59:04,542 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-22 19:59:04,542 INFO ]: Initializing ChcToBoogie... [2018-06-22 19:59:04,542 INFO ]: ChcToBoogie initialized [2018-06-22 19:59:04,554 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,652 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04 Unit [2018-06-22 19:59:04,652 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-22 19:59:04,653 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-22 19:59:04,653 INFO ]: Initializing Boogie Preprocessor... [2018-06-22 19:59:04,653 INFO ]: Boogie Preprocessor initialized [2018-06-22 19:59:04,678 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,678 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,698 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,698 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,717 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,718 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,721 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (1/1) ... [2018-06-22 19:59:04,734 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-22 19:59:04,734 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-22 19:59:04,734 INFO ]: Initializing RCFGBuilder... [2018-06-22 19:59:04,734 INFO ]: RCFGBuilder initialized [2018-06-22 19:59:04,735 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (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 19:59:04,756 INFO ]: Specification and implementation of procedure False given in one single declaration [2018-06-22 19:59:04,756 INFO ]: Found specification of procedure False [2018-06-22 19:59:04,756 INFO ]: Found implementation of procedure False [2018-06-22 19:59:04,756 INFO ]: Specification and implementation of procedure state given in one single declaration [2018-06-22 19:59:04,756 INFO ]: Found specification of procedure state [2018-06-22 19:59:04,756 INFO ]: Found implementation of procedure state [2018-06-22 19:59:04,756 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-22 19:59:04,756 INFO ]: Found specification of procedure Ultimate.START [2018-06-22 19:59:04,756 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 19:59:05,228 INFO ]: Using library mode [2018-06-22 19:59:05,228 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 07:59:05 BoogieIcfgContainer [2018-06-22 19:59:05,228 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-22 19:59:05,231 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-22 19:59:05,231 INFO ]: Initializing TraceAbstraction... [2018-06-22 19:59:05,236 INFO ]: TraceAbstraction initialized [2018-06-22 19:59:05,237 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 22.06 07:59:04" (1/3) ... [2018-06-22 19:59:05,238 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37cabe3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 22.06 07:59:05, skipping insertion in model container [2018-06-22 19:59:05,238 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 22.06 07:59:04" (2/3) ... [2018-06-22 19:59:05,238 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37cabe3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.06 07:59:05, skipping insertion in model container [2018-06-22 19:59:05,238 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.06 07:59:05" (3/3) ... [2018-06-22 19:59:05,241 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-22 19:59:05,251 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-22 19:59:05,259 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-22 19:59:05,310 INFO ]: Using default assertion order modulation [2018-06-22 19:59:05,310 INFO ]: Interprodecural is true [2018-06-22 19:59:05,310 INFO ]: Hoare is false [2018-06-22 19:59:05,310 INFO ]: Compute interpolants for FPandBP [2018-06-22 19:59:05,310 INFO ]: Backedges is TWOTRACK [2018-06-22 19:59:05,310 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-22 19:59:05,311 INFO ]: Difference is false [2018-06-22 19:59:05,311 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-22 19:59:05,311 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-22 19:59:05,331 INFO ]: Start isEmpty. Operand 13 states. [2018-06-22 19:59:05,346 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-22 19:59:05,346 INFO ]: Found error trace [2018-06-22 19:59:05,347 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:59:05,347 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:59:05,353 INFO ]: Analyzing trace with hash -683425083, now seen corresponding path program 1 times [2018-06-22 19:59:05,355 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:59:05,355 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:59:05,405 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:59:05,405 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:59:05,405 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:59:05,543 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:59:05,786 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-22 19:59:05,787 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-22 19:59:05,788 INFO ]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-06-22 19:59:05,790 INFO ]: Interpolant automaton has 4 states [2018-06-22 19:59:05,817 INFO ]: Constructing interpolant automaton starting with 4 interpolants. [2018-06-22 19:59:05,818 INFO ]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 19:59:05,821 INFO ]: Start difference. First operand 13 states. Second operand 4 states. [2018-06-22 19:59:05,935 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:59:05,935 INFO ]: Finished difference Result 13 states and 14 transitions. [2018-06-22 19:59:05,936 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-22 19:59:05,937 INFO ]: Start accepts. Automaton has 4 states. Word has length 9 [2018-06-22 19:59:05,938 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:59:05,949 INFO ]: With dead ends: 13 [2018-06-22 19:59:05,949 INFO ]: Without dead ends: 13 [2018-06-22 19:59:05,951 INFO ]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-06-22 19:59:05,970 INFO ]: Start minimizeSevpa. Operand 13 states. [2018-06-22 19:59:06,008 INFO ]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-06-22 19:59:06,009 INFO ]: Start removeUnreachable. Operand 13 states. [2018-06-22 19:59:06,010 INFO ]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-06-22 19:59:06,011 INFO ]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 9 [2018-06-22 19:59:06,011 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:59:06,011 INFO ]: Abstraction has 13 states and 14 transitions. [2018-06-22 19:59:06,011 INFO ]: Interpolant automaton has 4 states. [2018-06-22 19:59:06,011 INFO ]: Start isEmpty. Operand 13 states and 14 transitions. [2018-06-22 19:59:06,013 INFO ]: Finished isEmpty. Found accepting run of length 14 [2018-06-22 19:59:06,013 INFO ]: Found error trace [2018-06-22 19:59:06,013 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:59:06,013 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:59:06,013 INFO ]: Analyzing trace with hash 204343015, now seen corresponding path program 1 times [2018-06-22 19:59:06,013 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:59:06,013 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:59:06,015 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:59:06,015 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:59:06,015 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:59:06,140 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:59:07,014 WARN ]: Spent 661.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 30 [2018-06-22 19:59:07,109 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 19:59:07,109 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 19:59:07,109 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 19:59:07,116 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:59:07,277 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:59:07,290 INFO ]: Computing forward predicates... [2018-06-22 19:59:07,742 WARN ]: expecting exponential blowup for input size 7 [2018-06-22 19:59:07,772 WARN ]: expecting exponential blowup for input size 7 [2018-06-22 19:59:08,822 INFO ]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-06-22 19:59:08,857 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-22 19:59:08,857 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2018-06-22 19:59:08,858 INFO ]: Interpolant automaton has 8 states [2018-06-22 19:59:08,858 INFO ]: Constructing interpolant automaton starting with 8 interpolants. [2018-06-22 19:59:08,858 INFO ]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2018-06-22 19:59:08,858 INFO ]: Start difference. First operand 13 states and 14 transitions. Second operand 8 states. [2018-06-22 19:59:09,179 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-22 19:59:09,179 INFO ]: Finished difference Result 15 states and 16 transitions. [2018-06-22 19:59:09,180 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-22 19:59:09,180 INFO ]: Start accepts. Automaton has 8 states. Word has length 13 [2018-06-22 19:59:09,180 INFO ]: Finished accepts. some prefix is accepted. [2018-06-22 19:59:09,181 INFO ]: With dead ends: 15 [2018-06-22 19:59:09,181 INFO ]: Without dead ends: 15 [2018-06-22 19:59:09,182 INFO ]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-06-22 19:59:09,182 INFO ]: Start minimizeSevpa. Operand 15 states. [2018-06-22 19:59:09,184 INFO ]: Finished minimizeSevpa. Reduced states from 15 to 15. [2018-06-22 19:59:09,184 INFO ]: Start removeUnreachable. Operand 15 states. [2018-06-22 19:59:09,188 INFO ]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-06-22 19:59:09,188 INFO ]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2018-06-22 19:59:09,188 INFO ]: Finished accepts. word is rejected. [2018-06-22 19:59:09,188 INFO ]: Abstraction has 15 states and 16 transitions. [2018-06-22 19:59:09,188 INFO ]: Interpolant automaton has 8 states. [2018-06-22 19:59:09,188 INFO ]: Start isEmpty. Operand 15 states and 16 transitions. [2018-06-22 19:59:09,188 INFO ]: Finished isEmpty. Found accepting run of length 18 [2018-06-22 19:59:09,188 INFO ]: Found error trace [2018-06-22 19:59:09,188 INFO ]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2018-06-22 19:59:09,189 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-22 19:59:09,189 INFO ]: Analyzing trace with hash -1649658231, now seen corresponding path program 2 times [2018-06-22 19:59:09,189 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-22 19:59:09,189 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-22 19:59:09,190 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:59:09,190 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-22 19:59:09,190 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-22 19:59:09,285 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:59:09,782 WARN ]: Spent 165.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 59 [2018-06-22 19:59:09,832 INFO ]: Checked inductivity of 10 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-06-22 19:59:09,832 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-22 19:59:09,832 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 19:59:09,843 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-22 19:59:10,046 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-22 19:59:10,046 INFO ]: Conjunction of SSA is unsat [2018-06-22 19:59:10,054 INFO ]: Computing forward predicates... [2018-06-22 19:59:10,191 WARN ]: expecting exponential blowup for input size 6 [2018-06-22 19:59:10,195 WARN ]: expecting exponential blowup for input size 6 [2018-06-22 19:59:10,201 WARN ]: expecting exponential blowup for input size 6 [2018-06-22 19:59:10,207 WARN ]: expecting exponential blowup for input size 8 [2018-06-22 19:59:10,249 WARN ]: expecting exponential blowup for input size 7 [2018-06-22 19:59:10,262 WARN ]: expecting exponential blowup for input size 7 [2018-06-22 19:59:11,900 WARN ]: Spent 108.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 19 Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown