/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/sanfoundry_10_ground.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 09:37:54,717 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 09:37:54,721 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 09:37:54,763 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-01-06 09:37:54,777 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 09:37:54,778 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 09:37:54,780 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 09:37:54,782 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 09:37:54,783 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 09:37:54,784 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 09:37:54,796 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 09:37:54,799 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 09:37:54,801 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 09:37:54,803 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 09:37:54,804 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 09:37:54,805 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 09:37:54,809 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 09:37:54,825 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 09:37:54,826 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 09:37:54,829 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 09:37:54,832 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 09:37:54,885 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 09:37:54,885 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 09:37:54,889 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 09:37:54,890 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 09:37:54,890 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 09:37:54,890 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 09:37:54,891 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 09:37:54,891 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 09:37:54,891 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 09:37:54,891 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 09:37:54,892 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 09:37:54,892 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 09:37:54,893 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 09:37:54,893 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 09:37:54,893 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 09:37:54,893 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 09:37:54,893 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 09:37:54,894 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 09:37:54,894 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 09:37:54,894 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 09:37:54,894 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 09:37:54,894 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 09:37:54,895 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 09:37:54,895 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 09:37:54,895 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 09:37:54,895 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 09:37:55,275 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 09:37:55,322 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 09:37:55,325 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 09:37:55,327 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 09:37:55,327 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 09:37:55,329 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/sanfoundry_10_ground.c [2021-01-06 09:37:55,419 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/ab34c1a13/bff4b823cb7f4d4e896f30b42d53c44c/FLAGbf289aac8 [2021-01-06 09:37:56,037 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 09:37:56,038 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/sanfoundry_10_ground.c [2021-01-06 09:37:56,048 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/ab34c1a13/bff4b823cb7f4d4e896f30b42d53c44c/FLAGbf289aac8 [2021-01-06 09:37:56,379 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/ab34c1a13/bff4b823cb7f4d4e896f30b42d53c44c [2021-01-06 09:37:56,383 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 09:37:56,388 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 09:37:56,392 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 09:37:56,393 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 09:37:56,398 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 09:37:56,399 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,402 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52b6f1bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56, skipping insertion in model container [2021-01-06 09:37:56,403 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,416 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 09:37:56,439 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 09:37:56,631 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/sanfoundry_10_ground.c[324,337] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~vectorx~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~found~0,] left hand side expression in assignment: lhs: VariableLHS[~pos~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~vectorx~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2021-01-06 09:37:56,656 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 09:37:56,667 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 09:37:56,683 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/sanfoundry_10_ground.c[324,337] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#vectorx~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#vectorx~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~found~0,] left hand side expression in assignment: lhs: VariableLHS[~pos~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#vectorx~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#vectorx~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2021-01-06 09:37:56,693 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 09:37:56,712 INFO L208 MainTranslator]: Completed translation [2021-01-06 09:37:56,712 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56 WrapperNode [2021-01-06 09:37:56,712 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 09:37:56,714 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 09:37:56,714 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 09:37:56,714 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 09:37:56,724 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,733 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,756 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 09:37:56,757 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 09:37:56,757 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 09:37:56,757 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 09:37:56,767 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,768 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,770 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,770 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,776 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,782 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,784 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... [2021-01-06 09:37:56,786 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 09:37:56,788 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 09:37:56,788 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 09:37:56,788 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 09:37:56,789 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 09:37:56,900 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 09:37:56,901 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 09:37:56,901 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 09:37:56,901 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 09:37:56,901 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 09:37:56,901 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 09:37:56,902 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 09:37:57,221 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 09:37:57,222 INFO L299 CfgBuilder]: Removed 10 assume(true) statements. [2021-01-06 09:37:57,223 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 09:37:57 BoogieIcfgContainer [2021-01-06 09:37:57,224 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 09:37:57,226 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 09:37:57,227 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 09:37:57,230 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 09:37:57,231 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 09:37:56" (1/3) ... [2021-01-06 09:37:57,232 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13678609 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 09:37:57, skipping insertion in model container [2021-01-06 09:37:57,232 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:37:56" (2/3) ... [2021-01-06 09:37:57,233 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@13678609 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 09:37:57, skipping insertion in model container [2021-01-06 09:37:57,233 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 09:37:57" (3/3) ... [2021-01-06 09:37:57,235 INFO L111 eAbstractionObserver]: Analyzing ICFG sanfoundry_10_ground.c [2021-01-06 09:37:57,243 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 09:37:57,248 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 09:37:57,271 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 09:37:57,332 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 09:37:57,332 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 09:37:57,333 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 09:37:57,333 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 09:37:57,333 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 09:37:57,333 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 09:37:57,334 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 09:37:57,334 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 09:37:57,352 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2021-01-06 09:37:57,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 09:37:57,369 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:37:57,370 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:37:57,370 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:37:57,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:37:57,381 INFO L82 PathProgramCache]: Analyzing trace with hash -2044605464, now seen corresponding path program 1 times [2021-01-06 09:37:57,392 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:37:57,393 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45227901] [2021-01-06 09:37:57,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:37:57,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:57,567 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 09:37:57,568 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45227901] [2021-01-06 09:37:57,569 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 09:37:57,570 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-01-06 09:37:57,571 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577803738] [2021-01-06 09:37:57,576 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2021-01-06 09:37:57,577 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:37:57,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-01-06 09:37:57,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 09:37:57,603 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2021-01-06 09:37:57,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:37:57,629 INFO L93 Difference]: Finished difference Result 40 states and 60 transitions. [2021-01-06 09:37:57,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-01-06 09:37:57,631 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2021-01-06 09:37:57,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:37:57,657 INFO L225 Difference]: With dead ends: 40 [2021-01-06 09:37:57,660 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 09:37:57,666 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-01-06 09:37:57,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 09:37:57,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-01-06 09:37:57,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 09:37:57,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 23 transitions. [2021-01-06 09:37:57,716 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 23 transitions. Word has length 10 [2021-01-06 09:37:57,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:37:57,716 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 23 transitions. [2021-01-06 09:37:57,716 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2021-01-06 09:37:57,717 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 23 transitions. [2021-01-06 09:37:57,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 09:37:57,718 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:37:57,718 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:37:57,718 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 09:37:57,718 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:37:57,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:37:57,720 INFO L82 PathProgramCache]: Analyzing trace with hash 1935441171, now seen corresponding path program 1 times [2021-01-06 09:37:57,720 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:37:57,720 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [31557433] [2021-01-06 09:37:57,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:37:57,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:57,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 09:37:57,805 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [31557433] [2021-01-06 09:37:57,805 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 09:37:57,806 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 09:37:57,806 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898541386] [2021-01-06 09:37:57,807 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 09:37:57,808 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:37:57,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 09:37:57,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 09:37:57,810 INFO L87 Difference]: Start difference. First operand 18 states and 23 transitions. Second operand 3 states. [2021-01-06 09:37:57,863 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:37:57,864 INFO L93 Difference]: Finished difference Result 34 states and 44 transitions. [2021-01-06 09:37:57,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 09:37:57,865 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2021-01-06 09:37:57,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:37:57,866 INFO L225 Difference]: With dead ends: 34 [2021-01-06 09:37:57,866 INFO L226 Difference]: Without dead ends: 20 [2021-01-06 09:37:57,867 INFO L677 BasicCegarLoop]: 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 [2021-01-06 09:37:57,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-01-06 09:37:57,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-01-06 09:37:57,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2021-01-06 09:37:57,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2021-01-06 09:37:57,873 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 10 [2021-01-06 09:37:57,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:37:57,874 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2021-01-06 09:37:57,874 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 09:37:57,874 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2021-01-06 09:37:57,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-01-06 09:37:57,875 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:37:57,875 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:37:57,875 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 09:37:57,875 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:37:57,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:37:57,876 INFO L82 PathProgramCache]: Analyzing trace with hash 1280243605, now seen corresponding path program 1 times [2021-01-06 09:37:57,877 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:37:57,877 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75666449] [2021-01-06 09:37:57,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:37:57,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:57,969 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 09:37:57,970 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75666449] [2021-01-06 09:37:57,970 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 09:37:57,970 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-01-06 09:37:57,970 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1054924664] [2021-01-06 09:37:57,971 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-01-06 09:37:57,971 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:37:57,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-01-06 09:37:57,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 09:37:57,973 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand 4 states. [2021-01-06 09:37:58,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:37:58,048 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2021-01-06 09:37:58,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 09:37:58,049 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2021-01-06 09:37:58,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:37:58,051 INFO L225 Difference]: With dead ends: 38 [2021-01-06 09:37:58,051 INFO L226 Difference]: Without dead ends: 26 [2021-01-06 09:37:58,052 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-01-06 09:37:58,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-01-06 09:37:58,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2021-01-06 09:37:58,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-01-06 09:37:58,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2021-01-06 09:37:58,059 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 12 [2021-01-06 09:37:58,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:37:58,060 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2021-01-06 09:37:58,060 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-01-06 09:37:58,060 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2021-01-06 09:37:58,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 09:37:58,061 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:37:58,061 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:37:58,061 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-01-06 09:37:58,061 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:37:58,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:37:58,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1442235305, now seen corresponding path program 1 times [2021-01-06 09:37:58,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:37:58,063 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1089069278] [2021-01-06 09:37:58,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:37:58,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:58,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 09:37:58,122 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1089069278] [2021-01-06 09:37:58,123 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 09:37:58,123 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 09:37:58,123 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1793951548] [2021-01-06 09:37:58,124 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 09:37:58,124 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:37:58,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 09:37:58,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 09:37:58,126 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 3 states. [2021-01-06 09:37:58,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:37:58,147 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2021-01-06 09:37:58,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 09:37:58,148 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2021-01-06 09:37:58,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:37:58,149 INFO L225 Difference]: With dead ends: 34 [2021-01-06 09:37:58,149 INFO L226 Difference]: Without dead ends: 21 [2021-01-06 09:37:58,150 INFO L677 BasicCegarLoop]: 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 [2021-01-06 09:37:58,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-01-06 09:37:58,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-01-06 09:37:58,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2021-01-06 09:37:58,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-01-06 09:37:58,155 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 15 [2021-01-06 09:37:58,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:37:58,156 INFO L481 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-01-06 09:37:58,156 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 09:37:58,156 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-01-06 09:37:58,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-01-06 09:37:58,157 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:37:58,157 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:37:58,157 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-01-06 09:37:58,158 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:37:58,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:37:58,158 INFO L82 PathProgramCache]: Analyzing trace with hash 2093661559, now seen corresponding path program 1 times [2021-01-06 09:37:58,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:37:58,159 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871237533] [2021-01-06 09:37:58,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:37:58,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:58,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 09:37:58,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871237533] [2021-01-06 09:37:58,273 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510783412] [2021-01-06 09:37:58,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:37:58,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:58,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 09:37:58,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:37:58,545 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 09:37:58,545 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:37:58,546 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2021-01-06 09:37:58,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322684346] [2021-01-06 09:37:58,547 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 09:37:58,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:37:58,548 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 09:37:58,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-01-06 09:37:58,549 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 7 states. [2021-01-06 09:37:58,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:37:58,750 INFO L93 Difference]: Finished difference Result 63 states and 74 transitions. [2021-01-06 09:37:58,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 09:37:58,751 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2021-01-06 09:37:58,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:37:58,752 INFO L225 Difference]: With dead ends: 63 [2021-01-06 09:37:58,752 INFO L226 Difference]: Without dead ends: 47 [2021-01-06 09:37:58,753 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2021-01-06 09:37:58,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-01-06 09:37:58,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 31. [2021-01-06 09:37:58,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2021-01-06 09:37:58,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-01-06 09:37:58,762 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 16 [2021-01-06 09:37:58,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:37:58,762 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-01-06 09:37:58,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 09:37:58,762 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-01-06 09:37:58,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-01-06 09:37:58,763 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:37:58,764 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:37:58,977 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:37:58,978 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:37:58,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:37:58,980 INFO L82 PathProgramCache]: Analyzing trace with hash 1784042421, now seen corresponding path program 1 times [2021-01-06 09:37:58,980 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:37:58,981 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1370050529] [2021-01-06 09:37:58,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:37:59,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:59,062 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 09:37:59,063 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1370050529] [2021-01-06 09:37:59,063 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503552317] [2021-01-06 09:37:59,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:37:59,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:59,172 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 09:37:59,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:37:59,337 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 09:37:59,338 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:37:59,339 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-01-06 09:37:59,339 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140264037] [2021-01-06 09:37:59,340 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 09:37:59,341 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:37:59,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 09:37:59,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2021-01-06 09:37:59,343 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2021-01-06 09:37:59,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:37:59,420 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2021-01-06 09:37:59,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 09:37:59,424 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2021-01-06 09:37:59,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:37:59,426 INFO L225 Difference]: With dead ends: 58 [2021-01-06 09:37:59,426 INFO L226 Difference]: Without dead ends: 34 [2021-01-06 09:37:59,428 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2021-01-06 09:37:59,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-01-06 09:37:59,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-01-06 09:37:59,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2021-01-06 09:37:59,439 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2021-01-06 09:37:59,439 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 21 [2021-01-06 09:37:59,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:37:59,439 INFO L481 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2021-01-06 09:37:59,440 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 09:37:59,440 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2021-01-06 09:37:59,441 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-01-06 09:37:59,441 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:37:59,441 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:37:59,650 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:37:59,651 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:37:59,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:37:59,653 INFO L82 PathProgramCache]: Analyzing trace with hash 1999213555, now seen corresponding path program 2 times [2021-01-06 09:37:59,653 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:37:59,654 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194364541] [2021-01-06 09:37:59,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:37:59,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:37:59,781 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 09:37:59,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194364541] [2021-01-06 09:37:59,782 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448639791] [2021-01-06 09:37:59,782 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:37:59,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 09:37:59,845 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:37:59,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 09:37:59,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:37:59,944 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 09:37:59,945 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:37:59,945 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-01-06 09:37:59,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376239171] [2021-01-06 09:37:59,946 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 09:37:59,946 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:37:59,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 09:37:59,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=48, Unknown=0, NotChecked=0, Total=90 [2021-01-06 09:37:59,947 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 10 states. [2021-01-06 09:38:00,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:38:00,021 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2021-01-06 09:38:00,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 09:38:00,022 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2021-01-06 09:38:00,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:38:00,022 INFO L225 Difference]: With dead ends: 60 [2021-01-06 09:38:00,022 INFO L226 Difference]: Without dead ends: 36 [2021-01-06 09:38:00,023 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=42, Invalid=48, Unknown=0, NotChecked=0, Total=90 [2021-01-06 09:38:00,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-01-06 09:38:00,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-01-06 09:38:00,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2021-01-06 09:38:00,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-01-06 09:38:00,029 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 23 [2021-01-06 09:38:00,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:38:00,030 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-01-06 09:38:00,030 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 09:38:00,030 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-01-06 09:38:00,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-01-06 09:38:00,031 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:38:00,031 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:38:00,245 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:00,246 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:38:00,247 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:38:00,247 INFO L82 PathProgramCache]: Analyzing trace with hash -1674724175, now seen corresponding path program 3 times [2021-01-06 09:38:00,248 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:38:00,249 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1477879317] [2021-01-06 09:38:00,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:38:00,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:00,322 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 09:38:00,322 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1477879317] [2021-01-06 09:38:00,323 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [907260275] [2021-01-06 09:38:00,323 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:00,387 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-01-06 09:38:00,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:38:00,388 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 09:38:00,391 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:38:00,484 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 09:38:00,484 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:38:00,484 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2021-01-06 09:38:00,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208424372] [2021-01-06 09:38:00,485 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 09:38:00,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:38:00,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 09:38:00,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-01-06 09:38:00,486 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 11 states. [2021-01-06 09:38:00,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:38:00,826 INFO L93 Difference]: Finished difference Result 102 states and 119 transitions. [2021-01-06 09:38:00,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-01-06 09:38:00,830 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 25 [2021-01-06 09:38:00,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:38:00,831 INFO L225 Difference]: With dead ends: 102 [2021-01-06 09:38:00,831 INFO L226 Difference]: Without dead ends: 78 [2021-01-06 09:38:00,834 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=131, Invalid=211, Unknown=0, NotChecked=0, Total=342 [2021-01-06 09:38:00,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-01-06 09:38:00,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 44. [2021-01-06 09:38:00,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-01-06 09:38:00,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 49 transitions. [2021-01-06 09:38:00,852 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 49 transitions. Word has length 25 [2021-01-06 09:38:00,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:38:00,853 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 49 transitions. [2021-01-06 09:38:00,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 09:38:00,853 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 49 transitions. [2021-01-06 09:38:00,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-01-06 09:38:00,854 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:38:00,859 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:38:01,073 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:01,074 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:38:01,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:38:01,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1429948289, now seen corresponding path program 4 times [2021-01-06 09:38:01,076 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:38:01,076 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1066360545] [2021-01-06 09:38:01,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:38:01,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:01,165 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-01-06 09:38:01,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1066360545] [2021-01-06 09:38:01,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1364014132] [2021-01-06 09:38:01,166 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:01,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 09:38:01,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:38:01,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 12 conjunts are in the unsatisfiable core [2021-01-06 09:38:01,234 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:38:01,333 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-01-06 09:38:01,334 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:38:01,334 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2021-01-06 09:38:01,334 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378146057] [2021-01-06 09:38:01,335 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 09:38:01,335 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:38:01,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 09:38:01,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=116, Unknown=0, NotChecked=0, Total=156 [2021-01-06 09:38:01,336 INFO L87 Difference]: Start difference. First operand 44 states and 49 transitions. Second operand 13 states. [2021-01-06 09:38:01,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:38:01,600 INFO L93 Difference]: Finished difference Result 95 states and 107 transitions. [2021-01-06 09:38:01,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 09:38:01,600 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2021-01-06 09:38:01,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:38:01,601 INFO L225 Difference]: With dead ends: 95 [2021-01-06 09:38:01,601 INFO L226 Difference]: Without dead ends: 64 [2021-01-06 09:38:01,602 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-01-06 09:38:01,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-01-06 09:38:01,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 50. [2021-01-06 09:38:01,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 09:38:01,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 56 transitions. [2021-01-06 09:38:01,611 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 56 transitions. Word has length 30 [2021-01-06 09:38:01,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:38:01,612 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 56 transitions. [2021-01-06 09:38:01,612 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 09:38:01,612 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 56 transitions. [2021-01-06 09:38:01,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-01-06 09:38:01,613 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:38:01,613 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:38:01,826 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:01,827 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:38:01,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:38:01,828 INFO L82 PathProgramCache]: Analyzing trace with hash 17339129, now seen corresponding path program 1 times [2021-01-06 09:38:01,828 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:38:01,829 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [902323383] [2021-01-06 09:38:01,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:38:01,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:01,887 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2021-01-06 09:38:01,887 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [902323383] [2021-01-06 09:38:01,888 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [625381867] [2021-01-06 09:38:01,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:01,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:01,947 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 9 conjunts are in the unsatisfiable core [2021-01-06 09:38:01,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:38:02,131 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-01-06 09:38:02,131 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:38:02,132 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9] total 12 [2021-01-06 09:38:02,132 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846513114] [2021-01-06 09:38:02,132 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 09:38:02,133 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:38:02,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 09:38:02,134 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2021-01-06 09:38:02,134 INFO L87 Difference]: Start difference. First operand 50 states and 56 transitions. Second operand 12 states. [2021-01-06 09:38:02,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:38:02,237 INFO L93 Difference]: Finished difference Result 102 states and 115 transitions. [2021-01-06 09:38:02,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 09:38:02,237 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2021-01-06 09:38:02,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:38:02,238 INFO L225 Difference]: With dead ends: 102 [2021-01-06 09:38:02,238 INFO L226 Difference]: Without dead ends: 53 [2021-01-06 09:38:02,239 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=57, Invalid=125, Unknown=0, NotChecked=0, Total=182 [2021-01-06 09:38:02,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-01-06 09:38:02,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-01-06 09:38:02,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2021-01-06 09:38:02,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 57 transitions. [2021-01-06 09:38:02,248 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 57 transitions. Word has length 34 [2021-01-06 09:38:02,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:38:02,248 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 57 transitions. [2021-01-06 09:38:02,249 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 09:38:02,249 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 57 transitions. [2021-01-06 09:38:02,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-01-06 09:38:02,250 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:38:02,250 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:38:02,463 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:02,464 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:38:02,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:38:02,465 INFO L82 PathProgramCache]: Analyzing trace with hash 898815777, now seen corresponding path program 1 times [2021-01-06 09:38:02,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:38:02,466 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [393378975] [2021-01-06 09:38:02,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:38:02,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:02,601 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-01-06 09:38:02,601 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [393378975] [2021-01-06 09:38:02,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1534825264] [2021-01-06 09:38:02,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:02,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:02,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 09:38:02,670 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:38:02,820 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-01-06 09:38:02,821 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:38:02,822 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-01-06 09:38:02,822 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384243297] [2021-01-06 09:38:02,822 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 09:38:02,823 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:38:02,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 09:38:02,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2021-01-06 09:38:02,826 INFO L87 Difference]: Start difference. First operand 52 states and 57 transitions. Second operand 18 states. [2021-01-06 09:38:02,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:38:02,931 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2021-01-06 09:38:02,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 09:38:02,932 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 36 [2021-01-06 09:38:02,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:38:02,933 INFO L225 Difference]: With dead ends: 90 [2021-01-06 09:38:02,933 INFO L226 Difference]: Without dead ends: 55 [2021-01-06 09:38:02,934 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2021-01-06 09:38:02,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-01-06 09:38:02,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-01-06 09:38:02,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2021-01-06 09:38:02,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 59 transitions. [2021-01-06 09:38:02,942 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 59 transitions. Word has length 36 [2021-01-06 09:38:02,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:38:02,943 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 59 transitions. [2021-01-06 09:38:02,943 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 09:38:02,943 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 59 transitions. [2021-01-06 09:38:02,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-01-06 09:38:02,944 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:38:02,944 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:38:03,157 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:03,158 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:38:03,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:38:03,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1590996189, now seen corresponding path program 2 times [2021-01-06 09:38:03,159 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:38:03,160 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [193505151] [2021-01-06 09:38:03,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:38:03,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:03,293 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-01-06 09:38:03,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [193505151] [2021-01-06 09:38:03,294 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1101898648] [2021-01-06 09:38:03,294 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:03,360 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 09:38:03,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:38:03,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 11 conjunts are in the unsatisfiable core [2021-01-06 09:38:03,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:38:03,545 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-01-06 09:38:03,545 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:38:03,545 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-01-06 09:38:03,546 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1922534389] [2021-01-06 09:38:03,546 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-01-06 09:38:03,546 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:38:03,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-01-06 09:38:03,548 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=218, Unknown=0, NotChecked=0, Total=380 [2021-01-06 09:38:03,548 INFO L87 Difference]: Start difference. First operand 54 states and 59 transitions. Second operand 20 states. [2021-01-06 09:38:03,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:38:03,673 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2021-01-06 09:38:03,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 09:38:03,676 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 38 [2021-01-06 09:38:03,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:38:03,677 INFO L225 Difference]: With dead ends: 92 [2021-01-06 09:38:03,677 INFO L226 Difference]: Without dead ends: 57 [2021-01-06 09:38:03,678 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=162, Invalid=218, Unknown=0, NotChecked=0, Total=380 [2021-01-06 09:38:03,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-01-06 09:38:03,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-01-06 09:38:03,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2021-01-06 09:38:03,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2021-01-06 09:38:03,686 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 38 [2021-01-06 09:38:03,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:38:03,686 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2021-01-06 09:38:03,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2021-01-06 09:38:03,686 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2021-01-06 09:38:03,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-01-06 09:38:03,688 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:38:03,688 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:38:03,902 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-01-06 09:38:03,903 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:38:03,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:38:03,904 INFO L82 PathProgramCache]: Analyzing trace with hash -2003511643, now seen corresponding path program 3 times [2021-01-06 09:38:03,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:38:03,905 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948134314] [2021-01-06 09:38:03,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:38:03,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:38:04,046 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-01-06 09:38:04,047 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948134314] [2021-01-06 09:38:04,047 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022298643] [2021-01-06 09:38:04,047 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:38:04,133 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-01-06 09:38:04,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:38:04,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 18 conjunts are in the unsatisfiable core [2021-01-06 09:38:04,147 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:38:04,375 INFO L348 Elim1Store]: treesize reduction 52, result has 45.8 percent of original size [2021-01-06 09:38:04,376 INFO L382 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 59 [2021-01-06 09:38:04,382 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 09:38:04,389 INFO L547 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2021-01-06 09:38:04,426 INFO L625 ElimStorePlain]: treesize reduction 23, result has 64.1 percent of original size [2021-01-06 09:38:04,427 INFO L547 ElimStorePlain]: Start of recursive call 1: 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2021-01-06 09:38:04,428 INFO L244 ElimStorePlain]: Needed 2 recursive calls to eliminate 1 variables, input treesize:39, output treesize:41 [2021-01-06 09:38:04,470 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2021-01-06 09:38:08,578 WARN L197 SmtUtils]: Spent 2.04 s on a formula simplification that was a NOOP. DAG size: 34 [2021-01-06 09:38:08,586 INFO L639 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2021-01-06 09:38:12,637 WARN L197 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 23 [2021-01-06 09:38:14,683 WARN L197 SmtUtils]: Spent 2.01 s on a formula simplification that was a NOOP. DAG size: 25 [2021-01-06 09:38:14,724 INFO L134 CoverageAnalysis]: Checked inductivity of 94 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 88 trivial. 0 not checked. [2021-01-06 09:38:14,724 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:38:14,724 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 21 [2021-01-06 09:38:14,725 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140094309] [2021-01-06 09:38:14,725 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-01-06 09:38:14,725 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:38:14,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-01-06 09:38:14,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=317, Unknown=2, NotChecked=0, Total=420 [2021-01-06 09:38:14,727 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 21 states. [2021-01-06 09:40:06,384 WARN L197 SmtUtils]: Spent 8.07 s on a formula simplification. DAG size of input: 39 DAG size of output: 33 [2021-01-06 09:40:24,521 WARN L197 SmtUtils]: Spent 8.07 s on a formula simplification. DAG size of input: 41 DAG size of output: 35 [2021-01-06 09:40:44,717 WARN L197 SmtUtils]: Spent 4.08 s on a formula simplification. DAG size of input: 37 DAG size of output: 31 [2021-01-06 09:41:44,358 WARN L197 SmtUtils]: Spent 4.07 s on a formula simplification. DAG size of input: 35 DAG size of output: 29