/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-cav19/array_doub_access_init_const.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 11:00:53,088 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 11:00:53,090 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 11:00:53,131 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 11:00:53,132 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 11:00:53,133 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 11:00:53,135 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 11:00:53,137 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 11:00:53,139 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 11:00:53,140 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 11:00:53,141 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 11:00:53,143 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 11:00:53,143 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 11:00:53,145 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 11:00:53,146 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 11:00:53,147 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 11:00:53,148 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 11:00:53,160 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 11:00:53,162 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 11:00:53,170 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 11:00:53,174 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 11:00:53,176 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 11:00:53,177 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 11:00:53,178 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 11:00:53,184 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 11:00:53,197 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 11:00:53,204 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 11:00:53,206 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 11:00:53,207 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 11:00:53,258 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 11:00:53,258 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 11:00:53,260 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 11:00:53,260 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 11:00:53,261 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 11:00:53,261 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 11:00:53,261 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 11:00:53,261 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 11:00:53,261 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 11:00:53,262 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 11:00:53,262 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 11:00:53,263 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 11:00:53,263 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 11:00:53,263 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 11:00:53,264 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 11:00:53,264 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 11:00:53,264 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 11:00:53,264 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 11:00:53,265 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 11:00:53,265 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 11:00:53,265 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 11:00:53,265 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 11:00:53,265 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 11:00:53,266 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 11:00:53,266 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 11:00:53,266 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 11:00:53,666 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 11:00:53,689 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 11:00:53,692 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 11:00:53,693 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 11:00:53,694 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 11:00:53,695 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-cav19/array_doub_access_init_const.c [2021-01-06 11:00:53,776 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/a1f4c0d07/e86a23faa0304a2ea5f9d77a39f1664b/FLAG8dff0baa9 [2021-01-06 11:00:54,348 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 11:00:54,349 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-cav19/array_doub_access_init_const.c [2021-01-06 11:00:54,357 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/a1f4c0d07/e86a23faa0304a2ea5f9d77a39f1664b/FLAG8dff0baa9 [2021-01-06 11:00:54,705 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/a1f4c0d07/e86a23faa0304a2ea5f9d77a39f1664b [2021-01-06 11:00:54,708 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 11:00:54,711 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 11:00:54,712 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 11:00:54,712 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 11:00:54,720 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 11:00:54,721 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:54,722 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@19384a36 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54, skipping insertion in model container [2021-01-06 11:00:54,723 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:54,732 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 11:00:54,749 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 11:00:54,924 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-cav19/array_doub_access_init_const.c[419,432] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[BinaryExpression[ARITHMUL,IntegerLiteral[2],IdentifierExpression[~i~0,]]]] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[BinaryExpression[ARITHPLUS,IntegerLiteral[1],BinaryExpression[ARITHMUL,IntegerLiteral[2],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] [2021-01-06 11:00:54,947 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 11:00:54,957 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 11:00:54,972 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-cav19/array_doub_access_init_const.c[419,432] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[8],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: address: StructConstructor[[base,offset],[StructAccessExpression[IdentifierExpression[~#a~0,],base],BinaryExpression[ARITHPLUS,StructAccessExpression[IdentifierExpression[~#a~0,],offset],BinaryExpression[ARITHMUL,IntegerLiteral[4],BinaryExpression[ARITHPLUS,IntegerLiteral[1],BinaryExpression[ARITHMUL,IntegerLiteral[2],IdentifierExpression[~i~0,]]]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] [2021-01-06 11:00:54,979 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 11:00:54,996 INFO L208 MainTranslator]: Completed translation [2021-01-06 11:00:54,996 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54 WrapperNode [2021-01-06 11:00:54,997 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 11:00:54,998 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 11:00:54,998 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 11:00:54,998 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 11:00:55,008 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,016 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,036 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 11:00:55,037 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 11:00:55,037 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 11:00:55,038 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 11:00:55,048 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,048 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,050 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,050 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,055 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,060 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,061 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (1/1) ... [2021-01-06 11:00:55,063 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 11:00:55,064 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 11:00:55,064 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 11:00:55,064 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 11:00:55,065 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (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 11:00:55,177 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 11:00:55,177 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 11:00:55,178 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 11:00:55,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 11:00:55,178 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 11:00:55,178 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 11:00:55,178 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 11:00:55,464 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 11:00:55,465 INFO L299 CfgBuilder]: Removed 8 assume(true) statements. [2021-01-06 11:00:55,466 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 11:00:55 BoogieIcfgContainer [2021-01-06 11:00:55,467 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 11:00:55,469 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 11:00:55,469 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 11:00:55,473 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 11:00:55,473 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 11:00:54" (1/3) ... [2021-01-06 11:00:55,474 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a340c5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 11:00:55, skipping insertion in model container [2021-01-06 11:00:55,474 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 11:00:54" (2/3) ... [2021-01-06 11:00:55,475 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a340c5d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 11:00:55, skipping insertion in model container [2021-01-06 11:00:55,475 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 11:00:55" (3/3) ... [2021-01-06 11:00:55,477 INFO L111 eAbstractionObserver]: Analyzing ICFG array_doub_access_init_const.c [2021-01-06 11:00:55,485 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 11:00:55,491 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 11:00:55,515 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 11:00:55,549 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 11:00:55,549 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 11:00:55,550 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 11:00:55,550 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 11:00:55,550 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 11:00:55,550 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 11:00:55,550 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 11:00:55,551 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 11:00:55,573 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2021-01-06 11:00:55,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-01-06 11:00:55,609 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:55,610 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:55,611 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:55,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:55,628 INFO L82 PathProgramCache]: Analyzing trace with hash 1807957391, now seen corresponding path program 1 times [2021-01-06 11:00:55,659 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:55,660 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [241387686] [2021-01-06 11:00:55,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:55,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:55,882 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 11:00:55,883 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [241387686] [2021-01-06 11:00:55,884 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 11:00:55,884 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 11:00:55,885 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1731044644] [2021-01-06 11:00:55,890 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 11:00:55,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:00:55,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 11:00:55,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 11:00:55,910 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 3 states. [2021-01-06 11:00:55,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:00:55,966 INFO L93 Difference]: Finished difference Result 28 states and 36 transitions. [2021-01-06 11:00:55,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 11:00:55,968 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 7 [2021-01-06 11:00:55,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:00:55,978 INFO L225 Difference]: With dead ends: 28 [2021-01-06 11:00:55,978 INFO L226 Difference]: Without dead ends: 13 [2021-01-06 11:00:55,982 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 11:00:56,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-01-06 11:00:56,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-01-06 11:00:56,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2021-01-06 11:00:56,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-01-06 11:00:56,019 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 7 [2021-01-06 11:00:56,019 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:00:56,019 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-01-06 11:00:56,019 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 11:00:56,020 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-01-06 11:00:56,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 11:00:56,020 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:56,020 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:56,021 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 11:00:56,021 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:56,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:56,022 INFO L82 PathProgramCache]: Analyzing trace with hash -369319347, now seen corresponding path program 1 times [2021-01-06 11:00:56,022 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:56,023 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840266837] [2021-01-06 11:00:56,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:56,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:56,107 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:56,107 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840266837] [2021-01-06 11:00:56,109 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300175353] [2021-01-06 11:00:56,109 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 11:00:56,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:56,241 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 11:00:56,248 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:00:56,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:56,383 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:00:56,383 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2021-01-06 11:00:56,385 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051940849] [2021-01-06 11:00:56,387 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 11:00:56,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:00:56,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 11:00:56,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 11:00:56,391 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand 6 states. [2021-01-06 11:00:56,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:00:56,434 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-01-06 11:00:56,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 11:00:56,435 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 9 [2021-01-06 11:00:56,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:00:56,436 INFO L225 Difference]: With dead ends: 22 [2021-01-06 11:00:56,436 INFO L226 Difference]: Without dead ends: 15 [2021-01-06 11:00:56,438 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 11:00:56,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-01-06 11:00:56,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2021-01-06 11:00:56,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 11:00:56,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-01-06 11:00:56,450 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 9 [2021-01-06 11:00:56,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:00:56,450 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-01-06 11:00:56,450 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 11:00:56,450 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-01-06 11:00:56,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 11:00:56,452 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:56,452 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:56,652 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-01-06 11:00:56,654 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:56,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:56,656 INFO L82 PathProgramCache]: Analyzing trace with hash -1083191413, now seen corresponding path program 2 times [2021-01-06 11:00:56,656 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:56,657 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773748390] [2021-01-06 11:00:56,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:56,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:56,749 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:56,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773748390] [2021-01-06 11:00:56,750 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094833545] [2021-01-06 11:00:56,750 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 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 11:00:56,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 11:00:56,806 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:00:56,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 11:00:56,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:00:56,883 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:56,884 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:00:56,884 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2021-01-06 11:00:56,884 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1312035964] [2021-01-06 11:00:56,885 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 11:00:56,885 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:00:56,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 11:00:56,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=29, Unknown=0, NotChecked=0, Total=56 [2021-01-06 11:00:56,887 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 8 states. [2021-01-06 11:00:56,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:00:56,925 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-01-06 11:00:56,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 11:00:56,926 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 11 [2021-01-06 11:00:56,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:00:56,927 INFO L225 Difference]: With dead ends: 24 [2021-01-06 11:00:56,927 INFO L226 Difference]: Without dead ends: 17 [2021-01-06 11:00:56,928 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 9 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 11:00:56,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2021-01-06 11:00:56,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2021-01-06 11:00:56,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2021-01-06 11:00:56,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-01-06 11:00:56,937 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2021-01-06 11:00:56,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:00:56,938 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-01-06 11:00:56,938 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 11:00:56,938 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-01-06 11:00:56,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-01-06 11:00:56,939 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:56,940 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:57,148 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:00:57,149 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:57,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:57,152 INFO L82 PathProgramCache]: Analyzing trace with hash 80520521, now seen corresponding path program 3 times [2021-01-06 11:00:57,152 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:57,153 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330728699] [2021-01-06 11:00:57,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:57,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:57,281 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:57,282 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330728699] [2021-01-06 11:00:57,282 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [479770233] [2021-01-06 11:00:57,282 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 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 11:00:57,399 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-01-06 11:00:57,399 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:00:57,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 11:00:57,405 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:00:57,527 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:57,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:00:57,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2021-01-06 11:00:57,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840962017] [2021-01-06 11:00:57,528 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 11:00:57,529 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:00:57,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 11:00:57,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=48, Unknown=0, NotChecked=0, Total=90 [2021-01-06 11:00:57,530 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 10 states. [2021-01-06 11:00:57,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:00:57,607 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-01-06 11:00:57,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 11:00:57,607 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2021-01-06 11:00:57,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:00:57,608 INFO L225 Difference]: With dead ends: 26 [2021-01-06 11:00:57,608 INFO L226 Difference]: Without dead ends: 19 [2021-01-06 11:00:57,609 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 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 11:00:57,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-01-06 11:00:57,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2021-01-06 11:00:57,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 11:00:57,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2021-01-06 11:00:57,614 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2021-01-06 11:00:57,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:00:57,614 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2021-01-06 11:00:57,614 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 11:00:57,615 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2021-01-06 11:00:57,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 11:00:57,615 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:57,616 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:57,830 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:00:57,831 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:57,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:57,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1716192135, now seen corresponding path program 4 times [2021-01-06 11:00:57,833 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:57,834 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040963087] [2021-01-06 11:00:57,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:57,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:57,950 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:57,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040963087] [2021-01-06 11:00:57,951 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382718119] [2021-01-06 11:00:57,951 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 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 11:00:58,024 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 11:00:58,024 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:00:58,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 11:00:58,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:00:58,146 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:58,147 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:00:58,147 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2021-01-06 11:00:58,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246861882] [2021-01-06 11:00:58,148 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 11:00:58,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:00:58,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 11:00:58,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=72, Unknown=0, NotChecked=0, Total=132 [2021-01-06 11:00:58,150 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2021-01-06 11:00:58,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:00:58,195 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-01-06 11:00:58,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 11:00:58,195 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 15 [2021-01-06 11:00:58,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:00:58,196 INFO L225 Difference]: With dead ends: 28 [2021-01-06 11:00:58,196 INFO L226 Difference]: Without dead ends: 21 [2021-01-06 11:00:58,197 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=60, Invalid=72, Unknown=0, NotChecked=0, Total=132 [2021-01-06 11:00:58,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-01-06 11:00:58,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2021-01-06 11:00:58,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2021-01-06 11:00:58,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-01-06 11:00:58,201 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 15 [2021-01-06 11:00:58,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:00:58,202 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-01-06 11:00:58,202 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 11:00:58,202 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-01-06 11:00:58,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-01-06 11:00:58,203 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:58,203 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:58,418 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:00:58,419 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:58,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:58,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1638582853, now seen corresponding path program 5 times [2021-01-06 11:00:58,420 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:58,421 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1957497481] [2021-01-06 11:00:58,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:58,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:58,497 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:58,497 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1957497481] [2021-01-06 11:00:58,498 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [508342812] [2021-01-06 11:00:58,499 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 11:00:58,571 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2021-01-06 11:00:58,572 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:00:58,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 8 conjunts are in the unsatisfiable core [2021-01-06 11:00:58,574 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:00:58,729 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:58,729 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:00:58,731 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2021-01-06 11:00:58,731 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [84775009] [2021-01-06 11:00:58,732 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-01-06 11:00:58,732 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:00:58,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-01-06 11:00:58,734 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2021-01-06 11:00:58,734 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 14 states. [2021-01-06 11:00:58,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:00:58,793 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-01-06 11:00:58,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 11:00:58,794 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 17 [2021-01-06 11:00:58,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:00:58,794 INFO L225 Difference]: With dead ends: 30 [2021-01-06 11:00:58,795 INFO L226 Difference]: Without dead ends: 23 [2021-01-06 11:00:58,795 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2021-01-06 11:00:58,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-01-06 11:00:58,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-01-06 11:00:58,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-01-06 11:00:58,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 23 transitions. [2021-01-06 11:00:58,799 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 23 transitions. Word has length 17 [2021-01-06 11:00:58,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:00:58,800 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 23 transitions. [2021-01-06 11:00:58,800 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-01-06 11:00:58,800 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 23 transitions. [2021-01-06 11:00:58,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-01-06 11:00:58,801 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:58,801 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:59,015 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 11:00:59,016 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:59,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:59,017 INFO L82 PathProgramCache]: Analyzing trace with hash 70506883, now seen corresponding path program 6 times [2021-01-06 11:00:59,017 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:59,018 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269137149] [2021-01-06 11:00:59,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:59,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:59,159 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:59,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269137149] [2021-01-06 11:00:59,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [235140076] [2021-01-06 11:00:59,160 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE 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 11:00:59,263 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-01-06 11:00:59,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:00:59,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 9 conjunts are in the unsatisfiable core [2021-01-06 11:00:59,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:00:59,452 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:59,453 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:00:59,453 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-01-06 11:00:59,455 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60152532] [2021-01-06 11:00:59,456 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-01-06 11:00:59,456 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:00:59,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-01-06 11:00:59,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=135, Unknown=0, NotChecked=0, Total=240 [2021-01-06 11:00:59,458 INFO L87 Difference]: Start difference. First operand 22 states and 23 transitions. Second operand 16 states. [2021-01-06 11:00:59,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:00:59,523 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2021-01-06 11:00:59,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 11:00:59,523 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 19 [2021-01-06 11:00:59,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:00:59,524 INFO L225 Difference]: With dead ends: 32 [2021-01-06 11:00:59,524 INFO L226 Difference]: Without dead ends: 25 [2021-01-06 11:00:59,525 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=135, Unknown=0, NotChecked=0, Total=240 [2021-01-06 11:00:59,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-01-06 11:00:59,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2021-01-06 11:00:59,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-01-06 11:00:59,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-01-06 11:00:59,529 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2021-01-06 11:00:59,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:00:59,530 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-01-06 11:00:59,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2021-01-06 11:00:59,530 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-01-06 11:00:59,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-01-06 11:00:59,531 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:00:59,531 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:00:59,745 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:00:59,746 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:00:59,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:00:59,747 INFO L82 PathProgramCache]: Analyzing trace with hash 683020609, now seen corresponding path program 7 times [2021-01-06 11:00:59,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:00:59,748 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [624364072] [2021-01-06 11:00:59,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:00:59,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:59,850 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:00:59,850 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [624364072] [2021-01-06 11:00:59,851 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1088391045] [2021-01-06 11:00:59,851 INFO L93 rtionOrderModulation]: Changing assertion order to 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 11:00:59,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:00:59,894 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 11:00:59,895 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:00,031 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:00,032 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:00,032 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2021-01-06 11:01:00,032 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454372357] [2021-01-06 11:01:00,033 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 11:01:00,033 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:00,034 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 11:01:00,034 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=174, Unknown=0, NotChecked=0, Total=306 [2021-01-06 11:01:00,034 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 18 states. [2021-01-06 11:01:00,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:00,092 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2021-01-06 11:01:00,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 11:01:00,092 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 21 [2021-01-06 11:01:00,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:00,093 INFO L225 Difference]: With dead ends: 34 [2021-01-06 11:01:00,093 INFO L226 Difference]: Without dead ends: 27 [2021-01-06 11:01:00,094 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 14 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 11:01:00,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-01-06 11:01:00,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2021-01-06 11:01:00,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-01-06 11:01:00,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-01-06 11:01:00,099 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 21 [2021-01-06 11:01:00,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:00,099 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-01-06 11:01:00,099 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 11:01:00,099 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-01-06 11:01:00,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-01-06 11:01:00,100 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:00,100 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:00,314 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:00,315 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:00,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:00,316 INFO L82 PathProgramCache]: Analyzing trace with hash 898191743, now seen corresponding path program 8 times [2021-01-06 11:01:00,317 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:00,317 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574812329] [2021-01-06 11:01:00,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:00,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:00,442 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:00,442 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574812329] [2021-01-06 11:01:00,443 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762488467] [2021-01-06 11:01:00,443 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 11:01:00,489 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 11:01:00,489 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:00,490 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 11 conjunts are in the unsatisfiable core [2021-01-06 11:01:00,492 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:00,677 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:00,677 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:00,677 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2021-01-06 11:01:00,677 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34005933] [2021-01-06 11:01:00,678 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-01-06 11:01:00,678 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:00,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-01-06 11:01:00,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=218, Unknown=0, NotChecked=0, Total=380 [2021-01-06 11:01:00,679 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand 20 states. [2021-01-06 11:01:00,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:00,750 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2021-01-06 11:01:00,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 11:01:00,751 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 23 [2021-01-06 11:01:00,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:00,751 INFO L225 Difference]: With dead ends: 36 [2021-01-06 11:01:00,751 INFO L226 Difference]: Without dead ends: 29 [2021-01-06 11:01:00,753 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 15 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 11:01:00,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-01-06 11:01:00,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-01-06 11:01:00,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-01-06 11:01:00,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2021-01-06 11:01:00,758 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2021-01-06 11:01:00,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:00,758 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2021-01-06 11:01:00,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2021-01-06 11:01:00,758 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2021-01-06 11:01:00,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-01-06 11:01:00,759 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:00,759 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:00,960 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-01-06 11:01:00,960 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:00,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:00,961 INFO L82 PathProgramCache]: Analyzing trace with hash 1519221309, now seen corresponding path program 9 times [2021-01-06 11:01:00,961 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:00,962 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [544592597] [2021-01-06 11:01:00,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:00,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:01,138 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:01,139 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [544592597] [2021-01-06 11:01:01,139 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [966712500] [2021-01-06 11:01:01,139 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 11:01:01,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2021-01-06 11:01:01,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:01,363 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 12 conjunts are in the unsatisfiable core [2021-01-06 11:01:01,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:01,570 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:01,573 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:01,573 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 22 [2021-01-06 11:01:01,573 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180403546] [2021-01-06 11:01:01,575 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-01-06 11:01:01,576 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:01,577 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-01-06 11:01:01,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2021-01-06 11:01:01,584 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 22 states. [2021-01-06 11:01:01,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:01,662 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2021-01-06 11:01:01,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 11:01:01,663 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 25 [2021-01-06 11:01:01,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:01,665 INFO L225 Difference]: With dead ends: 38 [2021-01-06 11:01:01,665 INFO L226 Difference]: Without dead ends: 31 [2021-01-06 11:01:01,666 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=195, Invalid=267, Unknown=0, NotChecked=0, Total=462 [2021-01-06 11:01:01,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-01-06 11:01:01,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2021-01-06 11:01:01,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-01-06 11:01:01,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2021-01-06 11:01:01,681 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 25 [2021-01-06 11:01:01,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:01,684 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2021-01-06 11:01:01,684 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2021-01-06 11:01:01,684 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2021-01-06 11:01:01,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-01-06 11:01:01,685 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:01,685 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:01,886 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:01,886 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:01,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:01,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1328180091, now seen corresponding path program 10 times [2021-01-06 11:01:01,888 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:01,888 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1824177330] [2021-01-06 11:01:01,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:01,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:02,105 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:02,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1824177330] [2021-01-06 11:01:02,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522824611] [2021-01-06 11:01:02,106 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:02,310 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 11:01:02,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:02,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 11:01:02,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:02,527 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:02,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:02,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2021-01-06 11:01:02,528 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1618890436] [2021-01-06 11:01:02,528 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-01-06 11:01:02,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:02,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-01-06 11:01:02,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=321, Unknown=0, NotChecked=0, Total=552 [2021-01-06 11:01:02,529 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 24 states. [2021-01-06 11:01:02,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:02,608 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2021-01-06 11:01:02,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 11:01:02,609 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 27 [2021-01-06 11:01:02,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:02,609 INFO L225 Difference]: With dead ends: 40 [2021-01-06 11:01:02,609 INFO L226 Difference]: Without dead ends: 33 [2021-01-06 11:01:02,610 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=321, Unknown=0, NotChecked=0, Total=552 [2021-01-06 11:01:02,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-01-06 11:01:02,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-01-06 11:01:02,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2021-01-06 11:01:02,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 33 transitions. [2021-01-06 11:01:02,614 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 33 transitions. Word has length 27 [2021-01-06 11:01:02,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:02,615 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 33 transitions. [2021-01-06 11:01:02,615 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2021-01-06 11:01:02,615 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 33 transitions. [2021-01-06 11:01:02,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-01-06 11:01:02,616 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:02,616 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:02,830 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:02,831 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:02,831 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:02,832 INFO L82 PathProgramCache]: Analyzing trace with hash -1873803975, now seen corresponding path program 11 times [2021-01-06 11:01:02,832 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:02,832 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237888422] [2021-01-06 11:01:02,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:02,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:03,013 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:03,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237888422] [2021-01-06 11:01:03,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783879554] [2021-01-06 11:01:03,014 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:03,387 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2021-01-06 11:01:03,387 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:03,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 14 conjunts are in the unsatisfiable core [2021-01-06 11:01:03,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:03,645 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:03,645 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:03,645 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2021-01-06 11:01:03,645 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778518447] [2021-01-06 11:01:03,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-01-06 11:01:03,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:03,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-01-06 11:01:03,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=270, Invalid=380, Unknown=0, NotChecked=0, Total=650 [2021-01-06 11:01:03,648 INFO L87 Difference]: Start difference. First operand 32 states and 33 transitions. Second operand 26 states. [2021-01-06 11:01:03,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:03,739 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-01-06 11:01:03,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-01-06 11:01:03,740 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 29 [2021-01-06 11:01:03,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:03,741 INFO L225 Difference]: With dead ends: 42 [2021-01-06 11:01:03,741 INFO L226 Difference]: Without dead ends: 35 [2021-01-06 11:01:03,742 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 250 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=270, Invalid=380, Unknown=0, NotChecked=0, Total=650 [2021-01-06 11:01:03,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-01-06 11:01:03,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-01-06 11:01:03,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2021-01-06 11:01:03,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 35 transitions. [2021-01-06 11:01:03,747 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 35 transitions. Word has length 29 [2021-01-06 11:01:03,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:03,747 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 35 transitions. [2021-01-06 11:01:03,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2021-01-06 11:01:03,747 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 35 transitions. [2021-01-06 11:01:03,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-01-06 11:01:03,748 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:03,748 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:03,962 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-01-06 11:01:03,962 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:03,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:03,963 INFO L82 PathProgramCache]: Analyzing trace with hash 511059831, now seen corresponding path program 12 times [2021-01-06 11:01:03,963 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:03,964 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279291750] [2021-01-06 11:01:03,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:03,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:04,123 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:04,123 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279291750] [2021-01-06 11:01:04,123 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [977589110] [2021-01-06 11:01:04,123 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:04,738 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-01-06 11:01:04,738 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:04,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 15 conjunts are in the unsatisfiable core [2021-01-06 11:01:04,744 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:04,997 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:04,998 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:04,998 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 28 [2021-01-06 11:01:04,998 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359535830] [2021-01-06 11:01:04,999 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-01-06 11:01:04,999 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:05,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-01-06 11:01:05,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=444, Unknown=0, NotChecked=0, Total=756 [2021-01-06 11:01:05,000 INFO L87 Difference]: Start difference. First operand 34 states and 35 transitions. Second operand 28 states. [2021-01-06 11:01:05,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:05,112 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2021-01-06 11:01:05,113 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 11:01:05,113 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 31 [2021-01-06 11:01:05,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:05,114 INFO L225 Difference]: With dead ends: 44 [2021-01-06 11:01:05,114 INFO L226 Difference]: Without dead ends: 37 [2021-01-06 11:01:05,114 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=312, Invalid=444, Unknown=0, NotChecked=0, Total=756 [2021-01-06 11:01:05,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-01-06 11:01:05,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2021-01-06 11:01:05,118 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-01-06 11:01:05,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-01-06 11:01:05,119 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2021-01-06 11:01:05,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:05,119 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-01-06 11:01:05,119 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2021-01-06 11:01:05,119 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-01-06 11:01:05,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-01-06 11:01:05,120 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:05,120 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:05,330 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-01-06 11:01:05,331 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:05,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:05,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1147358667, now seen corresponding path program 13 times [2021-01-06 11:01:05,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:05,332 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1379070339] [2021-01-06 11:01:05,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:05,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:05,562 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:05,563 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1379070339] [2021-01-06 11:01:05,563 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179066291] [2021-01-06 11:01:05,563 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:05,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:05,619 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 11:01:05,621 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:05,887 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:05,888 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:05,888 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2021-01-06 11:01:05,888 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892529835] [2021-01-06 11:01:05,889 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-01-06 11:01:05,889 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:05,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-01-06 11:01:05,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2021-01-06 11:01:05,890 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 30 states. [2021-01-06 11:01:06,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:06,005 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2021-01-06 11:01:06,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-01-06 11:01:06,006 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 33 [2021-01-06 11:01:06,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:06,006 INFO L225 Difference]: With dead ends: 46 [2021-01-06 11:01:06,006 INFO L226 Difference]: Without dead ends: 39 [2021-01-06 11:01:06,007 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 348 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2021-01-06 11:01:06,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-01-06 11:01:06,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2021-01-06 11:01:06,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-01-06 11:01:06,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-01-06 11:01:06,011 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 33 [2021-01-06 11:01:06,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:06,012 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-01-06 11:01:06,012 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2021-01-06 11:01:06,012 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-01-06 11:01:06,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-01-06 11:01:06,013 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:06,013 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:06,228 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 11:01:06,229 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:06,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:06,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1454668429, now seen corresponding path program 14 times [2021-01-06 11:01:06,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:06,230 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503349071] [2021-01-06 11:01:06,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:06,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:06,497 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:06,498 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503349071] [2021-01-06 11:01:06,498 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [641763185] [2021-01-06 11:01:06,498 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:06,544 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 11:01:06,544 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:06,545 INFO L263 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 17 conjunts are in the unsatisfiable core [2021-01-06 11:01:06,547 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:06,837 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:06,837 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:06,837 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 32 [2021-01-06 11:01:06,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921100011] [2021-01-06 11:01:06,838 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-01-06 11:01:06,838 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:06,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-01-06 11:01:06,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=587, Unknown=0, NotChecked=0, Total=992 [2021-01-06 11:01:06,839 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand 32 states. [2021-01-06 11:01:06,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:06,943 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2021-01-06 11:01:06,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-01-06 11:01:06,944 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 35 [2021-01-06 11:01:06,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:06,945 INFO L225 Difference]: With dead ends: 48 [2021-01-06 11:01:06,945 INFO L226 Difference]: Without dead ends: 41 [2021-01-06 11:01:06,946 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 403 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=405, Invalid=587, Unknown=0, NotChecked=0, Total=992 [2021-01-06 11:01:06,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-01-06 11:01:06,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2021-01-06 11:01:06,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2021-01-06 11:01:06,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-01-06 11:01:06,950 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2021-01-06 11:01:06,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:06,950 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-01-06 11:01:06,951 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2021-01-06 11:01:06,951 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-01-06 11:01:06,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-01-06 11:01:06,951 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:06,951 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:07,164 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:07,165 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:07,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:07,166 INFO L82 PathProgramCache]: Analyzing trace with hash -426606287, now seen corresponding path program 15 times [2021-01-06 11:01:07,166 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:07,166 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2094578874] [2021-01-06 11:01:07,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:07,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:07,403 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:07,403 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2094578874] [2021-01-06 11:01:07,404 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398159868] [2021-01-06 11:01:07,404 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:07,998 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2021-01-06 11:01:07,998 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:08,003 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 18 conjunts are in the unsatisfiable core [2021-01-06 11:01:08,004 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:08,354 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:08,354 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:08,354 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 34 [2021-01-06 11:01:08,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110650918] [2021-01-06 11:01:08,355 INFO L461 AbstractCegarLoop]: Interpolant automaton has 34 states [2021-01-06 11:01:08,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:08,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-01-06 11:01:08,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=456, Invalid=666, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 11:01:08,356 INFO L87 Difference]: Start difference. First operand 40 states and 41 transitions. Second operand 34 states. [2021-01-06 11:01:08,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:08,469 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2021-01-06 11:01:08,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 11:01:08,470 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 37 [2021-01-06 11:01:08,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:08,471 INFO L225 Difference]: With dead ends: 50 [2021-01-06 11:01:08,471 INFO L226 Difference]: Without dead ends: 43 [2021-01-06 11:01:08,472 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 462 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=456, Invalid=666, Unknown=0, NotChecked=0, Total=1122 [2021-01-06 11:01:08,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-01-06 11:01:08,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2021-01-06 11:01:08,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2021-01-06 11:01:08,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2021-01-06 11:01:08,476 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 37 [2021-01-06 11:01:08,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:08,476 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2021-01-06 11:01:08,476 INFO L482 AbstractCegarLoop]: Interpolant automaton has 34 states. [2021-01-06 11:01:08,477 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2021-01-06 11:01:08,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-01-06 11:01:08,477 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:08,477 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:08,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 11:01:08,692 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:08,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:08,693 INFO L82 PathProgramCache]: Analyzing trace with hash -301365905, now seen corresponding path program 16 times [2021-01-06 11:01:08,693 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:08,693 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [53470206] [2021-01-06 11:01:08,694 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:08,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:08,979 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:08,979 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [53470206] [2021-01-06 11:01:08,979 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940451635] [2021-01-06 11:01:08,980 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:10,393 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 11:01:10,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:10,399 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 19 conjunts are in the unsatisfiable core [2021-01-06 11:01:10,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:10,744 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:10,745 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:10,745 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2021-01-06 11:01:10,745 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673667078] [2021-01-06 11:01:10,746 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2021-01-06 11:01:10,746 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:10,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-01-06 11:01:10,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=510, Invalid=750, Unknown=0, NotChecked=0, Total=1260 [2021-01-06 11:01:10,750 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 36 states. [2021-01-06 11:01:10,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:10,898 INFO L93 Difference]: Finished difference Result 52 states and 54 transitions. [2021-01-06 11:01:10,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-01-06 11:01:10,898 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 39 [2021-01-06 11:01:10,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:10,899 INFO L225 Difference]: With dead ends: 52 [2021-01-06 11:01:10,899 INFO L226 Difference]: Without dead ends: 45 [2021-01-06 11:01:10,900 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 525 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=510, Invalid=750, Unknown=0, NotChecked=0, Total=1260 [2021-01-06 11:01:10,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-01-06 11:01:10,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2021-01-06 11:01:10,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-01-06 11:01:10,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 45 transitions. [2021-01-06 11:01:10,904 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 45 transitions. Word has length 39 [2021-01-06 11:01:10,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:10,904 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 45 transitions. [2021-01-06 11:01:10,904 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2021-01-06 11:01:10,904 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 45 transitions. [2021-01-06 11:01:10,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-01-06 11:01:10,905 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:10,905 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:11,119 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-01-06 11:01:11,120 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:11,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:11,120 INFO L82 PathProgramCache]: Analyzing trace with hash -204443091, now seen corresponding path program 17 times [2021-01-06 11:01:11,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:11,121 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362073663] [2021-01-06 11:01:11,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:11,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:11,444 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:11,444 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362073663] [2021-01-06 11:01:11,444 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [547959403] [2021-01-06 11:01:11,444 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:12,453 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2021-01-06 11:01:12,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:12,460 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 20 conjunts are in the unsatisfiable core [2021-01-06 11:01:12,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:12,894 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:12,894 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:12,894 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 38 [2021-01-06 11:01:12,895 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2139230600] [2021-01-06 11:01:12,895 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2021-01-06 11:01:12,895 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:12,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-01-06 11:01:12,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=839, Unknown=0, NotChecked=0, Total=1406 [2021-01-06 11:01:12,897 INFO L87 Difference]: Start difference. First operand 44 states and 45 transitions. Second operand 38 states. [2021-01-06 11:01:13,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:13,042 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2021-01-06 11:01:13,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-01-06 11:01:13,043 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 41 [2021-01-06 11:01:13,043 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:13,044 INFO L225 Difference]: With dead ends: 54 [2021-01-06 11:01:13,044 INFO L226 Difference]: Without dead ends: 47 [2021-01-06 11:01:13,045 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 592 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=567, Invalid=839, Unknown=0, NotChecked=0, Total=1406 [2021-01-06 11:01:13,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-01-06 11:01:13,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2021-01-06 11:01:13,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2021-01-06 11:01:13,050 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 47 transitions. [2021-01-06 11:01:13,050 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 47 transitions. Word has length 41 [2021-01-06 11:01:13,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:13,051 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 47 transitions. [2021-01-06 11:01:13,051 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2021-01-06 11:01:13,051 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 47 transitions. [2021-01-06 11:01:13,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-01-06 11:01:13,052 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:13,052 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:13,259 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 11:01:13,260 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:13,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:13,261 INFO L82 PathProgramCache]: Analyzing trace with hash -1550899349, now seen corresponding path program 18 times [2021-01-06 11:01:13,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:13,261 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1154096373] [2021-01-06 11:01:13,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:13,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:13,587 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:13,588 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1154096373] [2021-01-06 11:01:13,588 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063213709] [2021-01-06 11:01:13,588 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:18,596 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2021-01-06 11:01:18,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:18,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 21 conjunts are in the unsatisfiable core [2021-01-06 11:01:18,611 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:19,069 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:19,069 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:19,070 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 40 [2021-01-06 11:01:19,070 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463684394] [2021-01-06 11:01:19,070 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2021-01-06 11:01:19,070 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:19,071 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-01-06 11:01:19,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=627, Invalid=933, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 11:01:19,072 INFO L87 Difference]: Start difference. First operand 46 states and 47 transitions. Second operand 40 states. [2021-01-06 11:01:19,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:19,174 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2021-01-06 11:01:19,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 11:01:19,175 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 43 [2021-01-06 11:01:19,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:19,175 INFO L225 Difference]: With dead ends: 56 [2021-01-06 11:01:19,175 INFO L226 Difference]: Without dead ends: 49 [2021-01-06 11:01:19,176 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 663 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=627, Invalid=933, Unknown=0, NotChecked=0, Total=1560 [2021-01-06 11:01:19,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-01-06 11:01:19,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2021-01-06 11:01:19,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2021-01-06 11:01:19,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2021-01-06 11:01:19,181 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 43 [2021-01-06 11:01:19,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:19,181 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2021-01-06 11:01:19,181 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2021-01-06 11:01:19,181 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2021-01-06 11:01:19,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-01-06 11:01:19,182 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:19,182 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:19,395 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:19,395 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:19,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:19,396 INFO L82 PathProgramCache]: Analyzing trace with hash 1584760105, now seen corresponding path program 19 times [2021-01-06 11:01:19,396 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:19,396 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756385098] [2021-01-06 11:01:19,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:19,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:19,829 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:19,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756385098] [2021-01-06 11:01:19,829 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694776349] [2021-01-06 11:01:19,830 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:19,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:19,889 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 22 conjunts are in the unsatisfiable core [2021-01-06 11:01:19,890 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:20,404 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:20,405 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:20,405 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 42 [2021-01-06 11:01:20,405 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057930351] [2021-01-06 11:01:20,406 INFO L461 AbstractCegarLoop]: Interpolant automaton has 42 states [2021-01-06 11:01:20,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:20,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-01-06 11:01:20,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=690, Invalid=1032, Unknown=0, NotChecked=0, Total=1722 [2021-01-06 11:01:20,408 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 42 states. [2021-01-06 11:01:20,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:20,569 INFO L93 Difference]: Finished difference Result 58 states and 60 transitions. [2021-01-06 11:01:20,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-01-06 11:01:20,569 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 45 [2021-01-06 11:01:20,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:20,570 INFO L225 Difference]: With dead ends: 58 [2021-01-06 11:01:20,570 INFO L226 Difference]: Without dead ends: 51 [2021-01-06 11:01:20,571 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 738 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=690, Invalid=1032, Unknown=0, NotChecked=0, Total=1722 [2021-01-06 11:01:20,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-01-06 11:01:20,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-01-06 11:01:20,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 11:01:20,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-01-06 11:01:20,579 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 45 [2021-01-06 11:01:20,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:20,580 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-01-06 11:01:20,580 INFO L482 AbstractCegarLoop]: Interpolant automaton has 42 states. [2021-01-06 11:01:20,580 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-01-06 11:01:20,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-01-06 11:01:20,581 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:20,581 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:20,794 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:20,795 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:20,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:20,795 INFO L82 PathProgramCache]: Analyzing trace with hash -113546393, now seen corresponding path program 20 times [2021-01-06 11:01:20,796 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:20,796 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2080994104] [2021-01-06 11:01:20,796 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:20,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:21,159 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:21,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2080994104] [2021-01-06 11:01:21,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1774830444] [2021-01-06 11:01:21,160 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:21,220 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 11:01:21,220 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:21,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 23 conjunts are in the unsatisfiable core [2021-01-06 11:01:21,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:21,685 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:21,685 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:21,685 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 44 [2021-01-06 11:01:21,686 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943215067] [2021-01-06 11:01:21,686 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2021-01-06 11:01:21,686 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:21,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-01-06 11:01:21,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=756, Invalid=1136, Unknown=0, NotChecked=0, Total=1892 [2021-01-06 11:01:21,688 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand 44 states. [2021-01-06 11:01:21,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:21,797 INFO L93 Difference]: Finished difference Result 60 states and 62 transitions. [2021-01-06 11:01:21,797 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-01-06 11:01:21,798 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 47 [2021-01-06 11:01:21,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:21,798 INFO L225 Difference]: With dead ends: 60 [2021-01-06 11:01:21,798 INFO L226 Difference]: Without dead ends: 53 [2021-01-06 11:01:21,799 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 817 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=756, Invalid=1136, Unknown=0, NotChecked=0, Total=1892 [2021-01-06 11:01:21,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-01-06 11:01:21,803 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 52. [2021-01-06 11:01:21,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2021-01-06 11:01:21,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 53 transitions. [2021-01-06 11:01:21,804 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 53 transitions. Word has length 47 [2021-01-06 11:01:21,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:21,804 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 53 transitions. [2021-01-06 11:01:21,804 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2021-01-06 11:01:21,804 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 53 transitions. [2021-01-06 11:01:21,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-01-06 11:01:21,805 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:21,805 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:22,018 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-01-06 11:01:22,019 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:22,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:22,019 INFO L82 PathProgramCache]: Analyzing trace with hash -98518491, now seen corresponding path program 21 times [2021-01-06 11:01:22,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:22,020 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2124038185] [2021-01-06 11:01:22,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:22,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:22,421 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:22,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2124038185] [2021-01-06 11:01:22,421 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2141687244] [2021-01-06 11:01:22,421 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:29,214 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2021-01-06 11:01:29,214 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:29,231 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 24 conjunts are in the unsatisfiable core [2021-01-06 11:01:29,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:29,798 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:29,798 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:29,798 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 46 [2021-01-06 11:01:29,799 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [638054310] [2021-01-06 11:01:29,799 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2021-01-06 11:01:29,799 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:29,800 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-01-06 11:01:29,800 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=825, Invalid=1245, Unknown=0, NotChecked=0, Total=2070 [2021-01-06 11:01:29,801 INFO L87 Difference]: Start difference. First operand 52 states and 53 transitions. Second operand 46 states. [2021-01-06 11:01:29,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:29,958 INFO L93 Difference]: Finished difference Result 62 states and 64 transitions. [2021-01-06 11:01:29,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-01-06 11:01:29,961 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 49 [2021-01-06 11:01:29,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:29,962 INFO L225 Difference]: With dead ends: 62 [2021-01-06 11:01:29,963 INFO L226 Difference]: Without dead ends: 55 [2021-01-06 11:01:29,963 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 900 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=825, Invalid=1245, Unknown=0, NotChecked=0, Total=2070 [2021-01-06 11:01:29,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-01-06 11:01:29,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-01-06 11:01:29,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2021-01-06 11:01:29,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2021-01-06 11:01:29,967 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 49 [2021-01-06 11:01:29,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:29,967 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2021-01-06 11:01:29,967 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2021-01-06 11:01:29,967 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2021-01-06 11:01:29,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-01-06 11:01:29,968 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:29,968 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:30,181 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-01-06 11:01:30,182 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:30,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:30,183 INFO L82 PathProgramCache]: Analyzing trace with hash 1458393443, now seen corresponding path program 22 times [2021-01-06 11:01:30,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:30,183 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371354117] [2021-01-06 11:01:30,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:30,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:30,631 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:30,631 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371354117] [2021-01-06 11:01:30,631 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [147798878] [2021-01-06 11:01:30,631 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:37,296 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 11:01:37,297 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:37,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 25 conjunts are in the unsatisfiable core [2021-01-06 11:01:37,312 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:37,957 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:37,957 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:37,957 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2021-01-06 11:01:37,957 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1170772123] [2021-01-06 11:01:37,958 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2021-01-06 11:01:37,958 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:37,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-01-06 11:01:37,959 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=897, Invalid=1359, Unknown=0, NotChecked=0, Total=2256 [2021-01-06 11:01:37,959 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 48 states. [2021-01-06 11:01:38,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:38,087 INFO L93 Difference]: Finished difference Result 64 states and 66 transitions. [2021-01-06 11:01:38,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-01-06 11:01:38,088 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 51 [2021-01-06 11:01:38,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:38,089 INFO L225 Difference]: With dead ends: 64 [2021-01-06 11:01:38,089 INFO L226 Difference]: Without dead ends: 57 [2021-01-06 11:01:38,091 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=897, Invalid=1359, Unknown=0, NotChecked=0, Total=2256 [2021-01-06 11:01:38,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-01-06 11:01:38,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2021-01-06 11:01:38,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2021-01-06 11:01:38,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 57 transitions. [2021-01-06 11:01:38,099 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 57 transitions. Word has length 51 [2021-01-06 11:01:38,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:38,099 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 57 transitions. [2021-01-06 11:01:38,099 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2021-01-06 11:01:38,099 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 57 transitions. [2021-01-06 11:01:38,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-01-06 11:01:38,100 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:38,100 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:38,300 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:38,301 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:38,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:38,302 INFO L82 PathProgramCache]: Analyzing trace with hash -1292824287, now seen corresponding path program 23 times [2021-01-06 11:01:38,302 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:38,302 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88481546] [2021-01-06 11:01:38,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:38,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:38,772 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:38,772 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88481546] [2021-01-06 11:01:38,772 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [476262505] [2021-01-06 11:01:38,772 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:01:51,412 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2021-01-06 11:01:51,412 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:01:51,434 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 26 conjunts are in the unsatisfiable core [2021-01-06 11:01:51,435 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:01:52,105 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:52,105 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:01:52,105 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2021-01-06 11:01:52,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240702524] [2021-01-06 11:01:52,106 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2021-01-06 11:01:52,106 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:01:52,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-01-06 11:01:52,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=972, Invalid=1478, Unknown=0, NotChecked=0, Total=2450 [2021-01-06 11:01:52,108 INFO L87 Difference]: Start difference. First operand 56 states and 57 transitions. Second operand 50 states. [2021-01-06 11:01:52,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:01:52,277 INFO L93 Difference]: Finished difference Result 66 states and 68 transitions. [2021-01-06 11:01:52,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-01-06 11:01:52,277 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 53 [2021-01-06 11:01:52,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:01:52,278 INFO L225 Difference]: With dead ends: 66 [2021-01-06 11:01:52,278 INFO L226 Difference]: Without dead ends: 59 [2021-01-06 11:01:52,279 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=972, Invalid=1478, Unknown=0, NotChecked=0, Total=2450 [2021-01-06 11:01:52,279 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2021-01-06 11:01:52,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2021-01-06 11:01:52,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2021-01-06 11:01:52,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 59 transitions. [2021-01-06 11:01:52,282 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 59 transitions. Word has length 53 [2021-01-06 11:01:52,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:01:52,283 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 59 transitions. [2021-01-06 11:01:52,283 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2021-01-06 11:01:52,283 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 59 transitions. [2021-01-06 11:01:52,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-01-06 11:01:52,283 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:01:52,284 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:01:52,484 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-01-06 11:01:52,485 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:01:52,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:01:52,486 INFO L82 PathProgramCache]: Analyzing trace with hash 486791519, now seen corresponding path program 24 times [2021-01-06 11:01:52,486 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:01:52,486 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156505611] [2021-01-06 11:01:52,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:01:52,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:01:53,012 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:01:53,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156505611] [2021-01-06 11:01:53,012 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [800672949] [2021-01-06 11:01:53,013 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:03:01,737 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2021-01-06 11:03:01,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:03:01,817 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 27 conjunts are in the unsatisfiable core [2021-01-06 11:03:01,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:03:02,526 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:02,526 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:03:02,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 52 [2021-01-06 11:03:02,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780793144] [2021-01-06 11:03:02,527 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2021-01-06 11:03:02,527 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:03:02,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-01-06 11:03:02,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1050, Invalid=1602, Unknown=0, NotChecked=0, Total=2652 [2021-01-06 11:03:02,529 INFO L87 Difference]: Start difference. First operand 58 states and 59 transitions. Second operand 52 states. [2021-01-06 11:03:02,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:03:02,751 INFO L93 Difference]: Finished difference Result 68 states and 70 transitions. [2021-01-06 11:03:02,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-01-06 11:03:02,752 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 55 [2021-01-06 11:03:02,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:03:02,753 INFO L225 Difference]: With dead ends: 68 [2021-01-06 11:03:02,753 INFO L226 Difference]: Without dead ends: 61 [2021-01-06 11:03:02,754 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1173 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1050, Invalid=1602, Unknown=0, NotChecked=0, Total=2652 [2021-01-06 11:03:02,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-01-06 11:03:02,756 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2021-01-06 11:03:02,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2021-01-06 11:03:02,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-01-06 11:03:02,757 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2021-01-06 11:03:02,757 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:03:02,758 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-01-06 11:03:02,758 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2021-01-06 11:03:02,758 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-01-06 11:03:02,758 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-01-06 11:03:02,758 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:03:02,758 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:03:02,969 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:03:02,970 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:03:02,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:03:02,971 INFO L82 PathProgramCache]: Analyzing trace with hash 1300597277, now seen corresponding path program 25 times [2021-01-06 11:03:02,971 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:03:02,971 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296237703] [2021-01-06 11:03:02,971 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:03:02,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:03:03,552 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:03,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296237703] [2021-01-06 11:03:03,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1786682138] [2021-01-06 11:03:03,553 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:03:03,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:03:03,612 INFO L263 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 28 conjunts are in the unsatisfiable core [2021-01-06 11:03:03,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:03:04,394 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:04,395 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:03:04,395 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 54 [2021-01-06 11:03:04,395 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446488557] [2021-01-06 11:03:04,395 INFO L461 AbstractCegarLoop]: Interpolant automaton has 54 states [2021-01-06 11:03:04,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:03:04,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2021-01-06 11:03:04,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1131, Invalid=1731, Unknown=0, NotChecked=0, Total=2862 [2021-01-06 11:03:04,398 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 54 states. [2021-01-06 11:03:04,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:03:04,557 INFO L93 Difference]: Finished difference Result 70 states and 72 transitions. [2021-01-06 11:03:04,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-01-06 11:03:04,557 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 57 [2021-01-06 11:03:04,558 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:03:04,558 INFO L225 Difference]: With dead ends: 70 [2021-01-06 11:03:04,558 INFO L226 Difference]: Without dead ends: 63 [2021-01-06 11:03:04,560 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1272 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1131, Invalid=1731, Unknown=0, NotChecked=0, Total=2862 [2021-01-06 11:03:04,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-01-06 11:03:04,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2021-01-06 11:03:04,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2021-01-06 11:03:04,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 63 transitions. [2021-01-06 11:03:04,563 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 63 transitions. Word has length 57 [2021-01-06 11:03:04,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:03:04,563 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 63 transitions. [2021-01-06 11:03:04,563 INFO L482 AbstractCegarLoop]: Interpolant automaton has 54 states. [2021-01-06 11:03:04,563 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 63 transitions. [2021-01-06 11:03:04,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-01-06 11:03:04,564 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:03:04,564 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:03:04,764 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-01-06 11:03:04,765 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:03:04,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:03:04,766 INFO L82 PathProgramCache]: Analyzing trace with hash 1683882843, now seen corresponding path program 26 times [2021-01-06 11:03:04,766 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:03:04,766 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2023002486] [2021-01-06 11:03:04,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:03:04,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:03:05,385 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:05,385 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2023002486] [2021-01-06 11:03:05,385 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329417730] [2021-01-06 11:03:05,386 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 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:03:05,451 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 11:03:05,451 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:03:05,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 29 conjunts are in the unsatisfiable core [2021-01-06 11:03:05,453 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:03:06,251 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:06,252 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:03:06,252 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 56 [2021-01-06 11:03:06,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330699651] [2021-01-06 11:03:06,252 INFO L461 AbstractCegarLoop]: Interpolant automaton has 56 states [2021-01-06 11:03:06,252 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:03:06,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-01-06 11:03:06,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1215, Invalid=1865, Unknown=0, NotChecked=0, Total=3080 [2021-01-06 11:03:06,254 INFO L87 Difference]: Start difference. First operand 62 states and 63 transitions. Second operand 56 states. [2021-01-06 11:03:06,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:03:06,454 INFO L93 Difference]: Finished difference Result 72 states and 74 transitions. [2021-01-06 11:03:06,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-01-06 11:03:06,454 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 59 [2021-01-06 11:03:06,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:03:06,455 INFO L225 Difference]: With dead ends: 72 [2021-01-06 11:03:06,455 INFO L226 Difference]: Without dead ends: 65 [2021-01-06 11:03:06,456 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1375 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1215, Invalid=1865, Unknown=0, NotChecked=0, Total=3080 [2021-01-06 11:03:06,456 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-01-06 11:03:06,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2021-01-06 11:03:06,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2021-01-06 11:03:06,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 65 transitions. [2021-01-06 11:03:06,459 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 65 transitions. Word has length 59 [2021-01-06 11:03:06,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:03:06,459 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 65 transitions. [2021-01-06 11:03:06,459 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2021-01-06 11:03:06,459 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 65 transitions. [2021-01-06 11:03:06,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-01-06 11:03:06,460 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:03:06,460 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:03:06,673 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-01-06 11:03:06,674 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:03:06,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:03:06,675 INFO L82 PathProgramCache]: Analyzing trace with hash 654124313, now seen corresponding path program 27 times [2021-01-06 11:03:06,675 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:03:06,675 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036112188] [2021-01-06 11:03:06,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:03:06,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:03:07,353 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:07,353 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036112188] [2021-01-06 11:03:07,353 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1382614883] [2021-01-06 11:03:07,354 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:03:45,690 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2021-01-06 11:03:45,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:03:45,740 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 30 conjunts are in the unsatisfiable core [2021-01-06 11:03:45,741 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:03:46,616 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:46,616 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:03:46,616 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 58 [2021-01-06 11:03:46,616 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [116572475] [2021-01-06 11:03:46,617 INFO L461 AbstractCegarLoop]: Interpolant automaton has 58 states [2021-01-06 11:03:46,617 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:03:46,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-01-06 11:03:46,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1302, Invalid=2004, Unknown=0, NotChecked=0, Total=3306 [2021-01-06 11:03:46,619 INFO L87 Difference]: Start difference. First operand 64 states and 65 transitions. Second operand 58 states. [2021-01-06 11:03:46,846 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:03:46,847 INFO L93 Difference]: Finished difference Result 74 states and 76 transitions. [2021-01-06 11:03:46,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-01-06 11:03:46,847 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 61 [2021-01-06 11:03:46,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:03:46,848 INFO L225 Difference]: With dead ends: 74 [2021-01-06 11:03:46,848 INFO L226 Difference]: Without dead ends: 67 [2021-01-06 11:03:46,849 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1482 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1302, Invalid=2004, Unknown=0, NotChecked=0, Total=3306 [2021-01-06 11:03:46,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2021-01-06 11:03:46,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2021-01-06 11:03:46,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2021-01-06 11:03:46,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2021-01-06 11:03:46,853 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 61 [2021-01-06 11:03:46,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:03:46,853 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2021-01-06 11:03:46,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2021-01-06 11:03:46,853 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2021-01-06 11:03:46,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-01-06 11:03:46,854 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:03:46,854 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:03:47,054 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-01-06 11:03:47,055 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:03:47,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:03:47,056 INFO L82 PathProgramCache]: Analyzing trace with hash -1101344937, now seen corresponding path program 28 times [2021-01-06 11:03:47,056 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:03:47,056 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465668906] [2021-01-06 11:03:47,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:03:47,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:03:47,720 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:03:47,720 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465668906] [2021-01-06 11:03:47,720 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [141399574] [2021-01-06 11:03:47,721 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 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 11:04:50,549 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 11:04:50,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 11:04:50,602 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 31 conjunts are in the unsatisfiable core [2021-01-06 11:04:50,604 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 11:04:51,500 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:04:51,500 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 11:04:51,500 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 60 [2021-01-06 11:04:51,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817370832] [2021-01-06 11:04:51,501 INFO L461 AbstractCegarLoop]: Interpolant automaton has 60 states [2021-01-06 11:04:51,501 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 11:04:51,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2021-01-06 11:04:51,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1392, Invalid=2148, Unknown=0, NotChecked=0, Total=3540 [2021-01-06 11:04:51,502 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 60 states. [2021-01-06 11:04:51,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 11:04:51,760 INFO L93 Difference]: Finished difference Result 76 states and 78 transitions. [2021-01-06 11:04:51,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-01-06 11:04:51,761 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 63 [2021-01-06 11:04:51,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 11:04:51,762 INFO L225 Difference]: With dead ends: 76 [2021-01-06 11:04:51,762 INFO L226 Difference]: Without dead ends: 69 [2021-01-06 11:04:51,763 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1593 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1392, Invalid=2148, Unknown=0, NotChecked=0, Total=3540 [2021-01-06 11:04:51,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-01-06 11:04:51,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2021-01-06 11:04:51,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2021-01-06 11:04:51,766 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 69 transitions. [2021-01-06 11:04:51,766 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 69 transitions. Word has length 63 [2021-01-06 11:04:51,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 11:04:51,766 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 69 transitions. [2021-01-06 11:04:51,766 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2021-01-06 11:04:51,766 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 69 transitions. [2021-01-06 11:04:51,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-01-06 11:04:51,767 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 11:04:51,767 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 11:04:51,981 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-01-06 11:04:51,982 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 11:04:51,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 11:04:51,983 INFO L82 PathProgramCache]: Analyzing trace with hash -185146859, now seen corresponding path program 29 times [2021-01-06 11:04:51,983 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 11:04:51,983 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [982834700] [2021-01-06 11:04:51,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 11:04:51,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 11:04:52,659 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 11:04:52,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [982834700] [2021-01-06 11:04:52,659 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1900272061] [2021-01-06 11:04:52,660 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true