java -Xss4m -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_Goto.epf -i /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested7.c.smt2 -------------------------------------------------------------------------------- This is Ultimate 0.1.23-14921ce [2018-06-25 13:14:15,072 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-06-25 13:14:15,074 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-06-25 13:14:15,088 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-06-25 13:14:15,088 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-06-25 13:14:15,091 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-06-25 13:14:15,093 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-06-25 13:14:15,095 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-06-25 13:14:15,096 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-06-25 13:14:15,098 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-06-25 13:14:15,099 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-06-25 13:14:15,099 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-06-25 13:14:15,100 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-06-25 13:14:15,101 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-06-25 13:14:15,106 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-06-25 13:14:15,107 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-06-25 13:14:15,108 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-06-25 13:14:15,121 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-06-25 13:14:15,123 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-06-25 13:14:15,123 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-06-25 13:14:15,125 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-06-25 13:14:15,127 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-06-25 13:14:15,127 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-06-25 13:14:15,127 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-06-25 13:14:15,128 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-06-25 13:14:15,133 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-06-25 13:14:15,133 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-06-25 13:14:15,134 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-06-25 13:14:15,135 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-06-25 13:14:15,135 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-06-25 13:14:15,140 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-06-25 13:14:15,141 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-06-25 13:14:15,141 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-06-25 13:14:15,142 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-06-25 13:14:15,142 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-06-25 13:14:15,143 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/chc/AutomizerCHC/AutomizerCHC_Goto.epf [2018-06-25 13:14:15,164 INFO L110 SettingsManager]: Loading preferences was successful [2018-06-25 13:14:15,165 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-06-25 13:14:15,165 INFO L131 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2018-06-25 13:14:15,165 INFO L133 SettingsManager]: * Logger pattern=[%d{ISO8601} %-5p]: %m%n [2018-06-25 13:14:15,168 INFO L131 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2018-06-25 13:14:15,168 INFO L133 SettingsManager]: * Create parallel compositions if possible=false [2018-06-25 13:14:15,168 INFO L133 SettingsManager]: * Create interprocedural compositions=false [2018-06-25 13:14:15,169 INFO L133 SettingsManager]: * Use SBE=true [2018-06-25 13:14:15,169 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-06-25 13:14:15,169 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-06-25 13:14:15,169 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-06-25 13:14:15,169 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-06-25 13:14:15,170 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-06-25 13:14:15,170 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-06-25 13:14:15,170 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-06-25 13:14:15,170 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-06-25 13:14:15,170 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-06-25 13:14:15,171 INFO L133 SettingsManager]: * Trace refinement strategy=CAMEL [2018-06-25 13:14:15,171 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-06-25 13:14:15,172 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-06-25 13:14:15,172 INFO L133 SettingsManager]: * Compute trace for counterexample result=false [2018-06-25 13:14:15,173 INFO L131 SettingsManager]: Preferences of SmtParser differ from their defaults: [2018-06-25 13:14:15,173 INFO L133 SettingsManager]: * Use TreeAutomizer as solver for the given file (assumes the file contains Horn clauses only).=true [2018-06-25 13:14:15,221 INFO ]: Repository-Root is: /tmp [2018-06-25 13:14:15,237 INFO ]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-06-25 13:14:15,243 INFO ]: [Toolchain 1]: Toolchain data selected. [2018-06-25 13:14:15,244 INFO ]: Initializing SmtParser... [2018-06-25 13:14:15,245 INFO ]: SmtParser initialized [2018-06-25 13:14:15,245 INFO ]: [Toolchain 1]: Parsing single file: /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested7.c.smt2 [2018-06-25 13:14:15,246 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 [2018-06-25 13:14:15,339 INFO ]: Executing SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested7.c.smt2 unknown [2018-06-25 13:14:15,716 INFO ]: Succesfully executed SMT file /storage/chc-comp/vmt-chc-benchmarks/ctigar/nested7.c.smt2 [2018-06-25 13:14:15,721 INFO ]: ####################### [Toolchain 1] ####################### [2018-06-25 13:14:15,727 INFO ]: Walking toolchain with 4 elements. [2018-06-25 13:14:15,727 INFO ]: ------------------------ChcToBoogie---------------------------- [2018-06-25 13:14:15,728 INFO ]: Initializing ChcToBoogie... [2018-06-25 13:14:15,728 INFO ]: ChcToBoogie initialized [2018-06-25 13:14:15,731 INFO ]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,786 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15 Unit [2018-06-25 13:14:15,786 INFO ]: ------------------------ END ChcToBoogie---------------------------- [2018-06-25 13:14:15,787 INFO ]: ------------------------Boogie Preprocessor---------------------------- [2018-06-25 13:14:15,787 INFO ]: Initializing Boogie Preprocessor... [2018-06-25 13:14:15,787 INFO ]: Boogie Preprocessor initialized [2018-06-25 13:14:15,807 INFO ]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,807 INFO ]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,829 INFO ]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,829 INFO ]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,842 INFO ]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,844 INFO ]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,846 INFO ]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (1/1) ... [2018-06-25 13:14:15,849 INFO ]: ------------------------ END Boogie Preprocessor---------------------------- [2018-06-25 13:14:15,850 INFO ]: ------------------------RCFGBuilder---------------------------- [2018-06-25 13:14:15,850 INFO ]: Initializing RCFGBuilder... [2018-06-25 13:14:15,850 INFO ]: RCFGBuilder initialized [2018-06-25 13:14:15,858 INFO ]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (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) [2018-06-25 13:14:15,871 INFO ]: Specification and implementation of procedure gotoProc given in one single declaration [2018-06-25 13:14:15,871 INFO ]: Found specification of procedure gotoProc [2018-06-25 13:14:15,871 INFO ]: Found implementation of procedure gotoProc [2018-06-25 13:14:15,871 INFO ]: Specification and implementation of procedure Ultimate.START given in one single declaration [2018-06-25 13:14:15,872 INFO ]: Found specification of procedure Ultimate.START [2018-06-25 13:14:15,872 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 [2018-06-25 13:14:16,190 INFO ]: Using library mode [2018-06-25 13:14:16,191 INFO ]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:14:16 BoogieIcfgContainer [2018-06-25 13:14:16,191 INFO ]: ------------------------ END RCFGBuilder---------------------------- [2018-06-25 13:14:16,192 INFO ]: ------------------------TraceAbstraction---------------------------- [2018-06-25 13:14:16,192 INFO ]: Initializing TraceAbstraction... [2018-06-25 13:14:16,195 INFO ]: TraceAbstraction initialized [2018-06-25 13:14:16,195 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.source.smtparser OTHER 25.06 01:14:15" (1/3) ... [2018-06-25 13:14:16,196 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62f47905 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 25.06 01:14:16, skipping insertion in model container [2018-06-25 13:14:16,196 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 25.06 01:14:15" (2/3) ... [2018-06-25 13:14:16,196 INFO ]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@62f47905 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.06 01:14:16, skipping insertion in model container [2018-06-25 13:14:16,196 INFO ]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.06 01:14:16" (3/3) ... [2018-06-25 13:14:16,198 INFO ]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2018-06-25 13:14:16,207 INFO ]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-06-25 13:14:16,214 INFO ]: Appying trace abstraction to program that has 1 error locations. [2018-06-25 13:14:16,250 INFO ]: Using default assertion order modulation [2018-06-25 13:14:16,250 INFO ]: Interprodecural is true [2018-06-25 13:14:16,250 INFO ]: Hoare is false [2018-06-25 13:14:16,250 INFO ]: Compute interpolants for FPandBP [2018-06-25 13:14:16,250 INFO ]: Backedges is TWOTRACK [2018-06-25 13:14:16,250 INFO ]: Determinization is PREDICATE_ABSTRACTION [2018-06-25 13:14:16,250 INFO ]: Difference is false [2018-06-25 13:14:16,250 INFO ]: Minimize is MINIMIZE_SEVPA [2018-06-25 13:14:16,251 INFO ]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-06-25 13:14:16,265 INFO ]: Start isEmpty. Operand 10 states. [2018-06-25 13:14:16,280 INFO ]: Finished isEmpty. Found accepting run of length 8 [2018-06-25 13:14:16,280 INFO ]: Found error trace [2018-06-25 13:14:16,280 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:14:16,280 INFO ]: === Iteration 1 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:14:16,286 INFO ]: Analyzing trace with hash 1284994894, now seen corresponding path program 1 times [2018-06-25 13:14:16,288 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:14:16,288 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:14:16,320 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:16,320 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:14:16,320 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:16,372 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:14:16,430 INFO ]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:14:16,432 INFO ]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-06-25 13:14:16,432 INFO ]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-06-25 13:14:16,433 INFO ]: Interpolant automaton has 3 states [2018-06-25 13:14:16,444 INFO ]: Constructing interpolant automaton starting with 3 interpolants. [2018-06-25 13:14:16,444 INFO ]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 13:14:16,447 INFO ]: Start difference. First operand 10 states. Second operand 3 states. [2018-06-25 13:14:16,519 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:14:16,519 INFO ]: Finished difference Result 9 states and 9 transitions. [2018-06-25 13:14:16,519 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-06-25 13:14:16,520 INFO ]: Start accepts. Automaton has 3 states. Word has length 7 [2018-06-25 13:14:16,521 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:14:16,527 INFO ]: With dead ends: 9 [2018-06-25 13:14:16,527 INFO ]: Without dead ends: 9 [2018-06-25 13:14:16,528 INFO ]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-06-25 13:14:16,541 INFO ]: Start minimizeSevpa. Operand 9 states. [2018-06-25 13:14:16,554 INFO ]: Finished minimizeSevpa. Reduced states from 9 to 9. [2018-06-25 13:14:16,556 INFO ]: Start removeUnreachable. Operand 9 states. [2018-06-25 13:14:16,556 INFO ]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2018-06-25 13:14:16,557 INFO ]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2018-06-25 13:14:16,557 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:14:16,557 INFO ]: Abstraction has 9 states and 9 transitions. [2018-06-25 13:14:16,557 INFO ]: Interpolant automaton has 3 states. [2018-06-25 13:14:16,557 INFO ]: Start isEmpty. Operand 9 states and 9 transitions. [2018-06-25 13:14:16,558 INFO ]: Finished isEmpty. Found accepting run of length 9 [2018-06-25 13:14:16,558 INFO ]: Found error trace [2018-06-25 13:14:16,558 INFO ]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:14:16,558 INFO ]: === Iteration 2 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:14:16,558 INFO ]: Analyzing trace with hash 1180964567, now seen corresponding path program 1 times [2018-06-25 13:14:16,558 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:14:16,558 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:14:16,559 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:16,559 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:14:16,559 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:16,622 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:14:16,775 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:14:16,775 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:14:16,775 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 [2018-06-25 13:14:16,783 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:14:16,849 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:14:16,860 INFO ]: Computing forward predicates... [2018-06-25 13:14:19,718 INFO ]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:14:19,737 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:14:19,737 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2018-06-25 13:14:19,738 INFO ]: Interpolant automaton has 5 states [2018-06-25 13:14:19,738 INFO ]: Constructing interpolant automaton starting with 5 interpolants. [2018-06-25 13:14:19,738 INFO ]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-06-25 13:14:19,738 INFO ]: Start difference. First operand 9 states and 9 transitions. Second operand 5 states. [2018-06-25 13:14:19,794 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:14:19,794 INFO ]: Finished difference Result 10 states and 10 transitions. [2018-06-25 13:14:19,795 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-06-25 13:14:19,795 INFO ]: Start accepts. Automaton has 5 states. Word has length 8 [2018-06-25 13:14:19,795 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:14:19,795 INFO ]: With dead ends: 10 [2018-06-25 13:14:19,795 INFO ]: Without dead ends: 10 [2018-06-25 13:14:19,796 INFO ]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=14, Invalid=16, Unknown=0, NotChecked=0, Total=30 [2018-06-25 13:14:19,796 INFO ]: Start minimizeSevpa. Operand 10 states. [2018-06-25 13:14:19,797 INFO ]: Finished minimizeSevpa. Reduced states from 10 to 10. [2018-06-25 13:14:19,797 INFO ]: Start removeUnreachable. Operand 10 states. [2018-06-25 13:14:19,797 INFO ]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2018-06-25 13:14:19,797 INFO ]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2018-06-25 13:14:19,797 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:14:19,797 INFO ]: Abstraction has 10 states and 10 transitions. [2018-06-25 13:14:19,797 INFO ]: Interpolant automaton has 5 states. [2018-06-25 13:14:19,797 INFO ]: Start isEmpty. Operand 10 states and 10 transitions. [2018-06-25 13:14:19,797 INFO ]: Finished isEmpty. Found accepting run of length 10 [2018-06-25 13:14:19,798 INFO ]: Found error trace [2018-06-25 13:14:19,798 INFO ]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:14:19,798 INFO ]: === Iteration 3 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:14:19,798 INFO ]: Analyzing trace with hash -2043975570, now seen corresponding path program 2 times [2018-06-25 13:14:19,798 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:14:19,798 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:14:19,799 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:19,799 INFO ]: Keeping assertion order NOT_INCREMENTALLY [2018-06-25 13:14:19,799 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:19,873 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:14:20,018 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:14:20,018 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:14:20,018 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 [2018-06-25 13:14:20,025 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-06-25 13:14:20,091 INFO ]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-06-25 13:14:20,092 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:14:20,095 INFO ]: Computing forward predicates... [2018-06-25 13:14:31,779 INFO ]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:14:31,799 INFO ]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2018-06-25 13:14:31,799 INFO ]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2018-06-25 13:14:31,799 INFO ]: Interpolant automaton has 6 states [2018-06-25 13:14:31,799 INFO ]: Constructing interpolant automaton starting with 6 interpolants. [2018-06-25 13:14:31,799 INFO ]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2018-06-25 13:14:31,800 INFO ]: Start difference. First operand 10 states and 10 transitions. Second operand 6 states. [2018-06-25 13:14:31,873 INFO ]: Subtrahend was deterministic. Have not used determinization. [2018-06-25 13:14:31,873 INFO ]: Finished difference Result 11 states and 11 transitions. [2018-06-25 13:14:31,873 INFO ]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-06-25 13:14:31,873 INFO ]: Start accepts. Automaton has 6 states. Word has length 9 [2018-06-25 13:14:31,873 INFO ]: Finished accepts. some prefix is accepted. [2018-06-25 13:14:31,874 INFO ]: With dead ends: 11 [2018-06-25 13:14:31,874 INFO ]: Without dead ends: 11 [2018-06-25 13:14:31,874 INFO ]: 0 DeclaredPredicates, 16 GetRequests, 7 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2018-06-25 13:14:31,874 INFO ]: Start minimizeSevpa. Operand 11 states. [2018-06-25 13:14:31,875 INFO ]: Finished minimizeSevpa. Reduced states from 11 to 11. [2018-06-25 13:14:31,875 INFO ]: Start removeUnreachable. Operand 11 states. [2018-06-25 13:14:31,876 INFO ]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2018-06-25 13:14:31,876 INFO ]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2018-06-25 13:14:31,876 INFO ]: Finished accepts. word is rejected. [2018-06-25 13:14:31,876 INFO ]: Abstraction has 11 states and 11 transitions. [2018-06-25 13:14:31,876 INFO ]: Interpolant automaton has 6 states. [2018-06-25 13:14:31,876 INFO ]: Start isEmpty. Operand 11 states and 11 transitions. [2018-06-25 13:14:31,876 INFO ]: Finished isEmpty. Found accepting run of length 11 [2018-06-25 13:14:31,876 INFO ]: Found error trace [2018-06-25 13:14:31,876 INFO ]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1] [2018-06-25 13:14:31,876 INFO ]: === Iteration 4 === [Ultimate.STARTErr0AssertViolationASSERT]=== [2018-06-25 13:14:31,876 INFO ]: Analyzing trace with hash 1062095287, now seen corresponding path program 3 times [2018-06-25 13:14:31,876 INFO ]: Switched to mode SMTINTERPOL_TREE_INTERPOLANTS [2018-06-25 13:14:31,877 INFO ]: Using refinement strategy CamelRefinementStrategy [2018-06-25 13:14:31,877 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:31,877 INFO ]: Changing assertion order to NOT_INCREMENTALLY [2018-06-25 13:14:31,877 INFO ]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-06-25 13:14:31,954 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:14:32,231 WARN ]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 7 [2018-06-25 13:14:32,913 WARN ]: Spent 489.00 ms on a formula simplification. DAG size of input: 11 DAG size of output: 7 [2018-06-25 13:14:33,160 WARN ]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 8 [2018-06-25 13:14:33,161 INFO ]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-06-25 13:14:33,161 INFO ]: The current sequences of interpolants are not accepted, trying to find more. [2018-06-25 13:14:33,161 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 [2018-06-25 13:14:33,167 INFO ]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-06-25 13:14:33,222 INFO ]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-06-25 13:14:33,222 INFO ]: Conjunction of SSA is unsat [2018-06-25 13:14:33,226 INFO ]: Computing forward predicates... Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown