/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/array-examples/standard_init2_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 09:47:49,038 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 09:47:49,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 09:47:49,102 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 09:47:49,103 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 09:47:49,108 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 09:47:49,112 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 09:47:49,118 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 09:47:49,122 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 09:47:49,128 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 09:47:49,133 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 09:47:49,134 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 09:47:49,135 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 09:47:49,138 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 09:47:49,140 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 09:47:49,142 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 09:47:49,143 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 09:47:49,148 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 09:47:49,157 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 09:47:49,165 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 09:47:49,168 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 09:47:49,171 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 09:47:49,172 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 09:47:49,175 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 09:47:49,185 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 09:47:49,193 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 09:47:49,194 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 09:47:49,197 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 09:47:49,198 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 09:47:49,199 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 09:47:49,200 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 09:47:49,200 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 09:47:49,207 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 09:47:49,208 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 09:47:49,209 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 09:47:49,210 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 09:47:49,211 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 09:47:49,267 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 09:47:49,267 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 09:47:49,273 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 09:47:49,273 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 09:47:49,274 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 09:47:49,274 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 09:47:49,274 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 09:47:49,274 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 09:47:49,275 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 09:47:49,275 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 09:47:49,276 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 09:47:49,277 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 09:47:49,277 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 09:47:49,277 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 09:47:49,278 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 09:47:49,278 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 09:47:49,278 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 09:47:49,278 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 09:47:49,279 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 09:47:49,279 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 09:47:49,279 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 09:47:49,279 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 09:47:49,280 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 09:47:49,280 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 09:47:49,280 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 09:47:49,280 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 09:47:49,819 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 09:47:49,855 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 09:47:49,858 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 09:47:49,860 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 09:47:49,861 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 09:47:49,862 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_init2_ground-1.i [2021-01-06 09:47:49,953 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/97eea8629/7e6eeb7bb3564f3c97f369317cd57707/FLAG6515b441f [2021-01-06 09:47:50,659 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 09:47:50,660 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init2_ground-1.i [2021-01-06 09:47:50,669 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/97eea8629/7e6eeb7bb3564f3c97f369317cd57707/FLAG6515b441f [2021-01-06 09:47:50,989 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/97eea8629/7e6eeb7bb3564f3c97f369317cd57707 [2021-01-06 09:47:50,992 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 09:47:50,995 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 09:47:50,996 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 09:47:50,997 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 09:47:51,005 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 09:47:51,007 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 09:47:50" (1/1) ... [2021-01-06 09:47:51,008 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@eda7d8b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51, skipping insertion in model container [2021-01-06 09:47:51,008 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 09:47:50" (1/1) ... [2021-01-06 09:47:51,017 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 09:47:51,034 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 09:47:51,191 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init2_ground-1.i[816,829] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: ArrayLHS[VariableLHS[~a~0,],[IdentifierExpression[~i~0,]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2021-01-06 09:47:51,210 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 09:47:51,220 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 09:47:51,235 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init2_ground-1.i[816,829] 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],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] 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[4],IdentifierExpression[~i~0,]]]]] left hand side expression in assignment: lhs: VariableLHS[~i~0,] left hand side expression in assignment: lhs: VariableLHS[~x~0,] [2021-01-06 09:47:51,242 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 09:47:51,259 INFO L208 MainTranslator]: Completed translation [2021-01-06 09:47:51,260 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51 WrapperNode [2021-01-06 09:47:51,260 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 09:47:51,261 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 09:47:51,262 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 09:47:51,262 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 09:47:51,271 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,280 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,301 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 09:47:51,302 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 09:47:51,303 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 09:47:51,303 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 09:47:51,313 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,313 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,315 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,316 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,321 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,326 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,328 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... [2021-01-06 09:47:51,330 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 09:47:51,331 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 09:47:51,331 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 09:47:51,331 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 09:47:51,332 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 09:47:51,430 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 09:47:51,430 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 09:47:51,430 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-01-06 09:47:51,430 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 09:47:51,431 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 09:47:51,431 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-01-06 09:47:51,431 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-01-06 09:47:51,746 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 09:47:51,747 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-01-06 09:47:51,748 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 09:47:51 BoogieIcfgContainer [2021-01-06 09:47:51,749 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 09:47:51,751 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 09:47:51,751 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 09:47:51,754 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 09:47:51,755 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 09:47:50" (1/3) ... [2021-01-06 09:47:51,756 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34ce3119 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 09:47:51, skipping insertion in model container [2021-01-06 09:47:51,756 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 09:47:51" (2/3) ... [2021-01-06 09:47:51,757 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34ce3119 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 09:47:51, skipping insertion in model container [2021-01-06 09:47:51,757 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 09:47:51" (3/3) ... [2021-01-06 09:47:51,759 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_init2_ground-1.i [2021-01-06 09:47:51,767 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 09:47:51,772 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 09:47:51,795 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 09:47:51,826 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 09:47:51,826 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 09:47:51,827 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 09:47:51,827 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 09:47:51,827 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 09:47:51,827 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 09:47:51,827 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 09:47:51,827 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 09:47:51,846 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2021-01-06 09:47:51,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-01-06 09:47:51,852 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:51,852 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:51,853 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:51,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:51,860 INFO L82 PathProgramCache]: Analyzing trace with hash -1157636873, now seen corresponding path program 1 times [2021-01-06 09:47:51,874 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:51,874 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [518031852] [2021-01-06 09:47:51,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:52,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:52,087 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 09:47:52,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [518031852] [2021-01-06 09:47:52,090 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 09:47:52,090 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-01-06 09:47:52,091 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [33432242] [2021-01-06 09:47:52,098 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-01-06 09:47:52,099 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:52,135 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-01-06 09:47:52,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 09:47:52,145 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2021-01-06 09:47:52,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:52,247 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2021-01-06 09:47:52,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-01-06 09:47:52,251 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2021-01-06 09:47:52,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:52,280 INFO L225 Difference]: With dead ends: 31 [2021-01-06 09:47:52,280 INFO L226 Difference]: Without dead ends: 14 [2021-01-06 09:47:52,287 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-01-06 09:47:52,310 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-01-06 09:47:52,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-01-06 09:47:52,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2021-01-06 09:47:52,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-01-06 09:47:52,334 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2021-01-06 09:47:52,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:52,334 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-01-06 09:47:52,334 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2021-01-06 09:47:52,334 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-01-06 09:47:52,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-01-06 09:47:52,336 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:52,336 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:52,337 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 09:47:52,338 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:52,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:52,341 INFO L82 PathProgramCache]: Analyzing trace with hash 970257334, now seen corresponding path program 1 times [2021-01-06 09:47:52,341 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:52,342 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693268365] [2021-01-06 09:47:52,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:52,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:52,410 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 09:47:52,410 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693268365] [2021-01-06 09:47:52,411 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [172861829] [2021-01-06 09:47:52,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:52,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:52,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2021-01-06 09:47:52,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:52,576 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-01-06 09:47:52,576 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:52,576 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2021-01-06 09:47:52,578 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784455750] [2021-01-06 09:47:52,579 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 09:47:52,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:52,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 09:47:52,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 09:47:52,580 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 5 states. [2021-01-06 09:47:52,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:52,621 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-01-06 09:47:52,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-01-06 09:47:52,622 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2021-01-06 09:47:52,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:52,623 INFO L225 Difference]: With dead ends: 26 [2021-01-06 09:47:52,623 INFO L226 Difference]: Without dead ends: 16 [2021-01-06 09:47:52,624 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2021-01-06 09:47:52,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-01-06 09:47:52,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-01-06 09:47:52,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2021-01-06 09:47:52,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-01-06 09:47:52,629 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2021-01-06 09:47:52,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:52,630 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-01-06 09:47:52,630 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 09:47:52,630 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-01-06 09:47:52,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-01-06 09:47:52,631 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:52,631 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:52,846 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-01-06 09:47:52,847 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:52,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:52,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1117998999, now seen corresponding path program 2 times [2021-01-06 09:47:52,848 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:52,848 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1469458595] [2021-01-06 09:47:52,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:52,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:52,990 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 09:47:52,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1469458595] [2021-01-06 09:47:52,991 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1653791466] [2021-01-06 09:47:52,991 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 09:47:53,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 09:47:53,044 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:53,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2021-01-06 09:47:53,046 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:53,075 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-01-06 09:47:53,076 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:53,076 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2021-01-06 09:47:53,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723384021] [2021-01-06 09:47:53,077 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-01-06 09:47:53,077 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:53,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-01-06 09:47:53,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 09:47:53,078 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2021-01-06 09:47:53,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:53,107 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2021-01-06 09:47:53,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 09:47:53,107 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2021-01-06 09:47:53,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:53,108 INFO L225 Difference]: With dead ends: 29 [2021-01-06 09:47:53,108 INFO L226 Difference]: Without dead ends: 18 [2021-01-06 09:47:53,109 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2021-01-06 09:47:53,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-01-06 09:47:53,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2021-01-06 09:47:53,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2021-01-06 09:47:53,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-01-06 09:47:53,114 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2021-01-06 09:47:53,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:53,114 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-01-06 09:47:53,114 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-01-06 09:47:53,114 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-01-06 09:47:53,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-01-06 09:47:53,115 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:53,115 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:53,329 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:53,330 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:53,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:53,332 INFO L82 PathProgramCache]: Analyzing trace with hash -1025156458, now seen corresponding path program 3 times [2021-01-06 09:47:53,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:53,333 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [119642314] [2021-01-06 09:47:53,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:53,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:53,391 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-01-06 09:47:53,391 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [119642314] [2021-01-06 09:47:53,392 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1869216988] [2021-01-06 09:47:53,392 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 09:47:53,453 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-01-06 09:47:53,454 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:53,455 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2021-01-06 09:47:53,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:53,489 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-01-06 09:47:53,490 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:53,490 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2021-01-06 09:47:53,490 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1672608611] [2021-01-06 09:47:53,491 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-01-06 09:47:53,491 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:53,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-01-06 09:47:53,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 09:47:53,492 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2021-01-06 09:47:53,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:53,523 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2021-01-06 09:47:53,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-01-06 09:47:53,524 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2021-01-06 09:47:53,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:53,524 INFO L225 Difference]: With dead ends: 32 [2021-01-06 09:47:53,525 INFO L226 Difference]: Without dead ends: 20 [2021-01-06 09:47:53,525 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2021-01-06 09:47:53,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-01-06 09:47:53,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-01-06 09:47:53,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2021-01-06 09:47:53,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-01-06 09:47:53,530 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2021-01-06 09:47:53,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:53,530 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-01-06 09:47:53,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-01-06 09:47:53,531 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-01-06 09:47:53,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-01-06 09:47:53,531 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:53,532 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:53,745 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:53,746 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:53,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:53,747 INFO L82 PathProgramCache]: Analyzing trace with hash -57021897, now seen corresponding path program 4 times [2021-01-06 09:47:53,748 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:53,748 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1525516215] [2021-01-06 09:47:53,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:53,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:53,864 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 09:47:53,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1525516215] [2021-01-06 09:47:53,864 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [392644675] [2021-01-06 09:47:53,865 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 09:47:53,922 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 09:47:53,922 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:53,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2021-01-06 09:47:53,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:53,960 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 09:47:53,961 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:53,961 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2021-01-06 09:47:53,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570124275] [2021-01-06 09:47:53,962 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 09:47:53,962 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:53,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 09:47:53,963 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 09:47:53,963 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 8 states. [2021-01-06 09:47:54,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:54,005 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-01-06 09:47:54,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-01-06 09:47:54,005 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2021-01-06 09:47:54,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:54,006 INFO L225 Difference]: With dead ends: 35 [2021-01-06 09:47:54,006 INFO L226 Difference]: Without dead ends: 22 [2021-01-06 09:47:54,007 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2021-01-06 09:47:54,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-01-06 09:47:54,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-01-06 09:47:54,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2021-01-06 09:47:54,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-01-06 09:47:54,012 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2021-01-06 09:47:54,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:54,013 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-01-06 09:47:54,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 09:47:54,013 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-01-06 09:47:54,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-01-06 09:47:54,014 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:54,014 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:54,228 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:54,230 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:54,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:54,231 INFO L82 PathProgramCache]: Analyzing trace with hash 315152758, now seen corresponding path program 5 times [2021-01-06 09:47:54,232 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:54,232 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916195363] [2021-01-06 09:47:54,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:54,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:54,359 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 09:47:54,359 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916195363] [2021-01-06 09:47:54,361 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [415965872] [2021-01-06 09:47:54,361 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 09:47:54,473 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2021-01-06 09:47:54,473 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:54,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 09:47:54,476 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:54,524 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-01-06 09:47:54,525 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:54,525 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2021-01-06 09:47:54,526 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865266667] [2021-01-06 09:47:54,526 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-01-06 09:47:54,526 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:54,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-01-06 09:47:54,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 09:47:54,527 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 9 states. [2021-01-06 09:47:54,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:54,565 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2021-01-06 09:47:54,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 09:47:54,565 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2021-01-06 09:47:54,565 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:54,566 INFO L225 Difference]: With dead ends: 38 [2021-01-06 09:47:54,566 INFO L226 Difference]: Without dead ends: 24 [2021-01-06 09:47:54,567 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2021-01-06 09:47:54,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-01-06 09:47:54,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-01-06 09:47:54,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2021-01-06 09:47:54,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2021-01-06 09:47:54,572 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2021-01-06 09:47:54,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:54,572 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2021-01-06 09:47:54,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-01-06 09:47:54,572 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2021-01-06 09:47:54,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-01-06 09:47:54,573 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:54,573 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:54,788 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 09:47:54,789 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:54,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:54,790 INFO L82 PathProgramCache]: Analyzing trace with hash -846091049, now seen corresponding path program 6 times [2021-01-06 09:47:54,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:54,791 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579907415] [2021-01-06 09:47:54,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:54,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:54,867 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-01-06 09:47:54,868 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579907415] [2021-01-06 09:47:54,868 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [273746390] [2021-01-06 09:47:54,868 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 09:47:54,947 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2021-01-06 09:47:54,947 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:54,949 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2021-01-06 09:47:54,950 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:54,990 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-01-06 09:47:54,990 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:54,991 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2021-01-06 09:47:54,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520539192] [2021-01-06 09:47:54,991 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-01-06 09:47:54,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:54,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-01-06 09:47:54,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-01-06 09:47:54,993 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 10 states. [2021-01-06 09:47:55,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:55,027 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2021-01-06 09:47:55,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-01-06 09:47:55,028 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2021-01-06 09:47:55,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:55,029 INFO L225 Difference]: With dead ends: 41 [2021-01-06 09:47:55,029 INFO L226 Difference]: Without dead ends: 26 [2021-01-06 09:47:55,029 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2021-01-06 09:47:55,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-01-06 09:47:55,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-01-06 09:47:55,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2021-01-06 09:47:55,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-01-06 09:47:55,034 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2021-01-06 09:47:55,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:55,034 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-01-06 09:47:55,034 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2021-01-06 09:47:55,034 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-01-06 09:47:55,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-01-06 09:47:55,035 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:55,035 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:55,252 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:55,253 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:55,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:55,254 INFO L82 PathProgramCache]: Analyzing trace with hash 401698902, now seen corresponding path program 7 times [2021-01-06 09:47:55,255 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:55,255 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105833263] [2021-01-06 09:47:55,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:55,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:55,376 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-01-06 09:47:55,376 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105833263] [2021-01-06 09:47:55,377 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818227303] [2021-01-06 09:47:55,377 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 09:47:55,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:55,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2021-01-06 09:47:55,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:55,519 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-01-06 09:47:55,520 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:55,520 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2021-01-06 09:47:55,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67787417] [2021-01-06 09:47:55,521 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-01-06 09:47:55,521 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:55,521 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-01-06 09:47:55,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-01-06 09:47:55,522 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 11 states. [2021-01-06 09:47:55,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:55,567 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2021-01-06 09:47:55,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-01-06 09:47:55,568 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2021-01-06 09:47:55,568 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:55,569 INFO L225 Difference]: With dead ends: 44 [2021-01-06 09:47:55,569 INFO L226 Difference]: Without dead ends: 28 [2021-01-06 09:47:55,570 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2021-01-06 09:47:55,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-01-06 09:47:55,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-01-06 09:47:55,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2021-01-06 09:47:55,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-01-06 09:47:55,574 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-01-06 09:47:55,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:55,574 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-01-06 09:47:55,575 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2021-01-06 09:47:55,575 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-01-06 09:47:55,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-01-06 09:47:55,575 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:55,576 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:55,790 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:55,791 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:55,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:55,791 INFO L82 PathProgramCache]: Analyzing trace with hash -88565897, now seen corresponding path program 8 times [2021-01-06 09:47:55,792 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:55,792 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [595615052] [2021-01-06 09:47:55,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:55,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:55,926 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 09:47:55,926 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [595615052] [2021-01-06 09:47:55,930 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1901832612] [2021-01-06 09:47:55,930 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:55,991 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 09:47:55,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:55,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 09:47:55,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:56,042 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-01-06 09:47:56,042 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:56,043 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-01-06 09:47:56,043 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297041063] [2021-01-06 09:47:56,043 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 09:47:56,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:56,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 09:47:56,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 09:47:56,045 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 12 states. [2021-01-06 09:47:56,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:56,098 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2021-01-06 09:47:56,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 09:47:56,099 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2021-01-06 09:47:56,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:56,100 INFO L225 Difference]: With dead ends: 47 [2021-01-06 09:47:56,100 INFO L226 Difference]: Without dead ends: 30 [2021-01-06 09:47:56,101 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2021-01-06 09:47:56,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-01-06 09:47:56,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-01-06 09:47:56,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2021-01-06 09:47:56,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-01-06 09:47:56,107 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2021-01-06 09:47:56,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:56,107 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-01-06 09:47:56,107 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 09:47:56,107 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-01-06 09:47:56,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-01-06 09:47:56,108 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:56,108 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:56,321 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-01-06 09:47:56,322 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:56,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:56,323 INFO L82 PathProgramCache]: Analyzing trace with hash -1068425418, now seen corresponding path program 9 times [2021-01-06 09:47:56,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:56,324 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760119622] [2021-01-06 09:47:56,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:56,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:56,457 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-01-06 09:47:56,457 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760119622] [2021-01-06 09:47:56,458 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1392262605] [2021-01-06 09:47:56,458 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:56,677 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-01-06 09:47:56,677 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:56,681 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 11 conjunts are in the unsatisfiable core [2021-01-06 09:47:56,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:56,792 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-01-06 09:47:56,793 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:56,793 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2021-01-06 09:47:56,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336483079] [2021-01-06 09:47:56,794 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-01-06 09:47:56,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:56,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-01-06 09:47:56,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2021-01-06 09:47:56,798 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2021-01-06 09:47:56,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:56,851 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2021-01-06 09:47:56,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-01-06 09:47:56,852 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2021-01-06 09:47:56,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:56,853 INFO L225 Difference]: With dead ends: 50 [2021-01-06 09:47:56,853 INFO L226 Difference]: Without dead ends: 32 [2021-01-06 09:47:56,854 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2021-01-06 09:47:56,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-01-06 09:47:56,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2021-01-06 09:47:56,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2021-01-06 09:47:56,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2021-01-06 09:47:56,859 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2021-01-06 09:47:56,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:56,860 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2021-01-06 09:47:56,860 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2021-01-06 09:47:56,860 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2021-01-06 09:47:56,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-01-06 09:47:56,861 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:56,861 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:57,075 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:57,076 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:57,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:57,077 INFO L82 PathProgramCache]: Analyzing trace with hash 163359255, now seen corresponding path program 10 times [2021-01-06 09:47:57,077 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:57,078 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185761076] [2021-01-06 09:47:57,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:57,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:57,264 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 09:47:57,265 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185761076] [2021-01-06 09:47:57,265 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434242678] [2021-01-06 09:47:57,265 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 09:47:57,314 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 09:47:57,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:57,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 12 conjunts are in the unsatisfiable core [2021-01-06 09:47:57,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:57,404 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-01-06 09:47:57,404 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:57,404 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2021-01-06 09:47:57,404 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564457546] [2021-01-06 09:47:57,405 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-01-06 09:47:57,405 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:57,405 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-01-06 09:47:57,406 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2021-01-06 09:47:57,406 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 14 states. [2021-01-06 09:47:57,482 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:57,483 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2021-01-06 09:47:57,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-01-06 09:47:57,484 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2021-01-06 09:47:57,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:57,490 INFO L225 Difference]: With dead ends: 53 [2021-01-06 09:47:57,491 INFO L226 Difference]: Without dead ends: 34 [2021-01-06 09:47:57,491 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2021-01-06 09:47:57,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-01-06 09:47:57,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2021-01-06 09:47:57,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2021-01-06 09:47:57,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-01-06 09:47:57,509 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2021-01-06 09:47:57,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:57,509 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-01-06 09:47:57,509 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2021-01-06 09:47:57,509 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-01-06 09:47:57,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-01-06 09:47:57,510 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:57,510 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:57,711 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:47:57,712 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:57,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:57,713 INFO L82 PathProgramCache]: Analyzing trace with hash 425322006, now seen corresponding path program 11 times [2021-01-06 09:47:57,713 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:57,713 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [681550916] [2021-01-06 09:47:57,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:57,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:57,879 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-01-06 09:47:57,879 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [681550916] [2021-01-06 09:47:57,879 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [199475129] [2021-01-06 09:47:57,879 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 09:47:58,310 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2021-01-06 09:47:58,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:58,314 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 13 conjunts are in the unsatisfiable core [2021-01-06 09:47:58,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:58,376 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-01-06 09:47:58,376 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:58,376 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-01-06 09:47:58,376 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531121916] [2021-01-06 09:47:58,377 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 09:47:58,377 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:58,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 09:47:58,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 09:47:58,378 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 15 states. [2021-01-06 09:47:58,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:58,434 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2021-01-06 09:47:58,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-01-06 09:47:58,435 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2021-01-06 09:47:58,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:58,435 INFO L225 Difference]: With dead ends: 56 [2021-01-06 09:47:58,435 INFO L226 Difference]: Without dead ends: 36 [2021-01-06 09:47:58,436 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2021-01-06 09:47:58,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-01-06 09:47:58,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-01-06 09:47:58,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-01-06 09:47:58,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-01-06 09:47:58,441 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2021-01-06 09:47:58,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:58,441 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-01-06 09:47:58,441 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 09:47:58,442 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-01-06 09:47:58,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-01-06 09:47:58,442 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:58,442 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:58,655 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-01-06 09:47:58,656 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:58,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:58,657 INFO L82 PathProgramCache]: Analyzing trace with hash -1597250377, now seen corresponding path program 12 times [2021-01-06 09:47:58,657 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:58,658 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759312894] [2021-01-06 09:47:58,658 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:58,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:58,911 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 09:47:58,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759312894] [2021-01-06 09:47:58,912 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1674844771] [2021-01-06 09:47:58,912 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 09:47:59,445 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2021-01-06 09:47:59,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:47:59,448 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 14 conjunts are in the unsatisfiable core [2021-01-06 09:47:59,450 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:47:59,508 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-01-06 09:47:59,509 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:47:59,509 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2021-01-06 09:47:59,509 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2107148704] [2021-01-06 09:47:59,509 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-01-06 09:47:59,510 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:47:59,510 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-01-06 09:47:59,510 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2021-01-06 09:47:59,511 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 16 states. [2021-01-06 09:47:59,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:47:59,559 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2021-01-06 09:47:59,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 09:47:59,560 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2021-01-06 09:47:59,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:47:59,561 INFO L225 Difference]: With dead ends: 59 [2021-01-06 09:47:59,561 INFO L226 Difference]: Without dead ends: 38 [2021-01-06 09:47:59,561 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2021-01-06 09:47:59,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-01-06 09:47:59,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-01-06 09:47:59,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2021-01-06 09:47:59,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2021-01-06 09:47:59,566 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 33 [2021-01-06 09:47:59,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:47:59,566 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2021-01-06 09:47:59,567 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2021-01-06 09:47:59,567 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2021-01-06 09:47:59,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-01-06 09:47:59,567 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:47:59,567 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:47:59,779 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-01-06 09:47:59,780 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:47:59,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:47:59,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1878902006, now seen corresponding path program 13 times [2021-01-06 09:47:59,781 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:47:59,782 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [922935742] [2021-01-06 09:47:59,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:47:59,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:47:59,984 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 09:47:59,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [922935742] [2021-01-06 09:47:59,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [913136914] [2021-01-06 09:47:59,984 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 09:48:00,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:00,050 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 15 conjunts are in the unsatisfiable core [2021-01-06 09:48:00,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:00,146 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-01-06 09:48:00,146 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:00,146 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2021-01-06 09:48:00,147 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376254771] [2021-01-06 09:48:00,148 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2021-01-06 09:48:00,148 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:00,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-01-06 09:48:00,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2021-01-06 09:48:00,149 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 17 states. [2021-01-06 09:48:00,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:00,217 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2021-01-06 09:48:00,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-01-06 09:48:00,217 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2021-01-06 09:48:00,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:00,218 INFO L225 Difference]: With dead ends: 62 [2021-01-06 09:48:00,218 INFO L226 Difference]: Without dead ends: 40 [2021-01-06 09:48:00,220 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2021-01-06 09:48:00,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-01-06 09:48:00,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-01-06 09:48:00,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2021-01-06 09:48:00,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-01-06 09:48:00,231 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2021-01-06 09:48:00,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:00,231 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-01-06 09:48:00,231 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2021-01-06 09:48:00,231 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-01-06 09:48:00,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-01-06 09:48:00,233 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:00,234 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:00,446 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-01-06 09:48:00,447 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:00,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:00,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1720993623, now seen corresponding path program 14 times [2021-01-06 09:48:00,448 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:00,448 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471160339] [2021-01-06 09:48:00,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:00,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:00,652 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-01-06 09:48:00,653 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471160339] [2021-01-06 09:48:00,653 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2066022311] [2021-01-06 09:48:00,653 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 09:48:00,728 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 09:48:00,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:00,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 16 conjunts are in the unsatisfiable core [2021-01-06 09:48:00,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:00,815 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-01-06 09:48:00,816 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:00,816 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2021-01-06 09:48:00,816 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2021915249] [2021-01-06 09:48:00,817 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 09:48:00,817 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:00,817 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 09:48:00,818 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-01-06 09:48:00,818 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 18 states. [2021-01-06 09:48:00,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:00,882 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2021-01-06 09:48:00,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-01-06 09:48:00,883 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2021-01-06 09:48:00,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:00,884 INFO L225 Difference]: With dead ends: 65 [2021-01-06 09:48:00,884 INFO L226 Difference]: Without dead ends: 42 [2021-01-06 09:48:00,884 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2021-01-06 09:48:00,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-01-06 09:48:00,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2021-01-06 09:48:00,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2021-01-06 09:48:00,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2021-01-06 09:48:00,889 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2021-01-06 09:48:00,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:00,890 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2021-01-06 09:48:00,890 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 09:48:00,890 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2021-01-06 09:48:00,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-01-06 09:48:00,891 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:00,891 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:01,106 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:48:01,107 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:01,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:01,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1890499542, now seen corresponding path program 15 times [2021-01-06 09:48:01,108 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:01,108 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1388391328] [2021-01-06 09:48:01,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:01,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:01,328 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-01-06 09:48:01,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1388391328] [2021-01-06 09:48:01,328 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1286631164] [2021-01-06 09:48:01,329 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 09:48:02,132 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-01-06 09:48:02,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:02,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 17 conjunts are in the unsatisfiable core [2021-01-06 09:48:02,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:02,223 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-01-06 09:48:02,224 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:02,224 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2021-01-06 09:48:02,224 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598475396] [2021-01-06 09:48:02,225 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-01-06 09:48:02,225 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:02,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-01-06 09:48:02,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2021-01-06 09:48:02,226 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 19 states. [2021-01-06 09:48:02,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:02,312 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-01-06 09:48:02,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-01-06 09:48:02,313 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2021-01-06 09:48:02,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:02,314 INFO L225 Difference]: With dead ends: 68 [2021-01-06 09:48:02,314 INFO L226 Difference]: Without dead ends: 44 [2021-01-06 09:48:02,315 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2021-01-06 09:48:02,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-01-06 09:48:02,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-01-06 09:48:02,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2021-01-06 09:48:02,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2021-01-06 09:48:02,320 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 39 [2021-01-06 09:48:02,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:02,320 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2021-01-06 09:48:02,320 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2021-01-06 09:48:02,320 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2021-01-06 09:48:02,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-01-06 09:48:02,321 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:02,321 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:02,533 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-01-06 09:48:02,533 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:02,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:02,534 INFO L82 PathProgramCache]: Analyzing trace with hash -498871817, now seen corresponding path program 16 times [2021-01-06 09:48:02,534 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:02,535 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618775252] [2021-01-06 09:48:02,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:02,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:02,771 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-01-06 09:48:02,772 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618775252] [2021-01-06 09:48:02,772 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [121342873] [2021-01-06 09:48:02,772 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 09:48:02,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 09:48:02,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:02,842 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 18 conjunts are in the unsatisfiable core [2021-01-06 09:48:02,844 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:02,911 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-01-06 09:48:02,911 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:02,911 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2021-01-06 09:48:02,912 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102617770] [2021-01-06 09:48:02,912 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2021-01-06 09:48:02,912 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:02,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-01-06 09:48:02,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2021-01-06 09:48:02,913 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 20 states. [2021-01-06 09:48:02,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:02,986 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2021-01-06 09:48:02,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-01-06 09:48:02,987 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2021-01-06 09:48:02,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:02,987 INFO L225 Difference]: With dead ends: 71 [2021-01-06 09:48:02,988 INFO L226 Difference]: Without dead ends: 46 [2021-01-06 09:48:02,988 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2021-01-06 09:48:02,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-01-06 09:48:02,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2021-01-06 09:48:02,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2021-01-06 09:48:02,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2021-01-06 09:48:02,993 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2021-01-06 09:48:02,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:02,994 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2021-01-06 09:48:02,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2021-01-06 09:48:02,994 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2021-01-06 09:48:02,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-01-06 09:48:02,994 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:02,995 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:03,210 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-01-06 09:48:03,211 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:03,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:03,212 INFO L82 PathProgramCache]: Analyzing trace with hash 1197394614, now seen corresponding path program 17 times [2021-01-06 09:48:03,212 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:03,213 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303361223] [2021-01-06 09:48:03,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:03,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:03,461 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-01-06 09:48:03,461 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303361223] [2021-01-06 09:48:03,462 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478611903] [2021-01-06 09:48:03,462 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 09:48:10,792 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2021-01-06 09:48:10,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:10,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 19 conjunts are in the unsatisfiable core [2021-01-06 09:48:10,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:10,889 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2021-01-06 09:48:10,889 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:10,889 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2021-01-06 09:48:10,889 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399978478] [2021-01-06 09:48:10,890 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2021-01-06 09:48:10,890 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:10,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2021-01-06 09:48:10,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2021-01-06 09:48:10,911 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 21 states. [2021-01-06 09:48:10,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:10,999 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2021-01-06 09:48:10,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-01-06 09:48:10,999 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2021-01-06 09:48:10,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:11,000 INFO L225 Difference]: With dead ends: 74 [2021-01-06 09:48:11,000 INFO L226 Difference]: Without dead ends: 48 [2021-01-06 09:48:11,001 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2021-01-06 09:48:11,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2021-01-06 09:48:11,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2021-01-06 09:48:11,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2021-01-06 09:48:11,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2021-01-06 09:48:11,006 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 43 [2021-01-06 09:48:11,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:11,007 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2021-01-06 09:48:11,007 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2021-01-06 09:48:11,007 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2021-01-06 09:48:11,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-01-06 09:48:11,007 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:11,008 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:11,208 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-01-06 09:48:11,209 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:11,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:11,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1535673495, now seen corresponding path program 18 times [2021-01-06 09:48:11,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:11,210 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773718994] [2021-01-06 09:48:11,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:11,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:11,530 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-01-06 09:48:11,531 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773718994] [2021-01-06 09:48:11,531 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [775324514] [2021-01-06 09:48:11,531 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 09:48:14,851 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2021-01-06 09:48:14,851 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:14,861 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 20 conjunts are in the unsatisfiable core [2021-01-06 09:48:14,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:14,944 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2021-01-06 09:48:14,944 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:14,944 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2021-01-06 09:48:14,945 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200961948] [2021-01-06 09:48:14,945 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-01-06 09:48:14,945 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:14,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-01-06 09:48:14,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2021-01-06 09:48:14,946 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 22 states. [2021-01-06 09:48:15,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:15,006 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2021-01-06 09:48:15,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-01-06 09:48:15,006 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2021-01-06 09:48:15,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:15,007 INFO L225 Difference]: With dead ends: 77 [2021-01-06 09:48:15,007 INFO L226 Difference]: Without dead ends: 50 [2021-01-06 09:48:15,008 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2021-01-06 09:48:15,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-01-06 09:48:15,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-01-06 09:48:15,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2021-01-06 09:48:15,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2021-01-06 09:48:15,013 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 45 [2021-01-06 09:48:15,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:15,013 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2021-01-06 09:48:15,013 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2021-01-06 09:48:15,014 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2021-01-06 09:48:15,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-01-06 09:48:15,014 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:15,014 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:15,228 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:48:15,229 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:15,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:15,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1082134122, now seen corresponding path program 19 times [2021-01-06 09:48:15,230 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:15,230 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378784538] [2021-01-06 09:48:15,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:15,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:15,567 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-01-06 09:48:15,568 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378784538] [2021-01-06 09:48:15,568 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [254259511] [2021-01-06 09:48:15,568 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 09:48:15,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:15,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 21 conjunts are in the unsatisfiable core [2021-01-06 09:48:15,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:15,722 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-01-06 09:48:15,722 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:15,723 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2021-01-06 09:48:15,723 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1504274526] [2021-01-06 09:48:15,723 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2021-01-06 09:48:15,723 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:15,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-01-06 09:48:15,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2021-01-06 09:48:15,724 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 23 states. [2021-01-06 09:48:15,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:15,800 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2021-01-06 09:48:15,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-01-06 09:48:15,801 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2021-01-06 09:48:15,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:15,801 INFO L225 Difference]: With dead ends: 80 [2021-01-06 09:48:15,801 INFO L226 Difference]: Without dead ends: 52 [2021-01-06 09:48:15,802 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2021-01-06 09:48:15,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-01-06 09:48:15,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2021-01-06 09:48:15,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2021-01-06 09:48:15,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2021-01-06 09:48:15,807 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2021-01-06 09:48:15,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:15,807 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2021-01-06 09:48:15,807 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2021-01-06 09:48:15,807 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2021-01-06 09:48:15,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-01-06 09:48:15,808 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:15,808 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:16,019 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:48:16,020 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:16,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:16,021 INFO L82 PathProgramCache]: Analyzing trace with hash -1164943561, now seen corresponding path program 20 times [2021-01-06 09:48:16,021 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:16,021 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1356149991] [2021-01-06 09:48:16,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:16,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:16,401 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-01-06 09:48:16,401 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1356149991] [2021-01-06 09:48:16,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [249782557] [2021-01-06 09:48:16,402 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 09:48:16,470 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 09:48:16,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:16,472 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 22 conjunts are in the unsatisfiable core [2021-01-06 09:48:16,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:16,558 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2021-01-06 09:48:16,558 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:16,558 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2021-01-06 09:48:16,559 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [763017991] [2021-01-06 09:48:16,561 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2021-01-06 09:48:16,562 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:16,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-01-06 09:48:16,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2021-01-06 09:48:16,563 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 24 states. [2021-01-06 09:48:16,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:16,651 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2021-01-06 09:48:16,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-01-06 09:48:16,652 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2021-01-06 09:48:16,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:16,653 INFO L225 Difference]: With dead ends: 83 [2021-01-06 09:48:16,653 INFO L226 Difference]: Without dead ends: 54 [2021-01-06 09:48:16,656 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2021-01-06 09:48:16,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-01-06 09:48:16,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-01-06 09:48:16,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2021-01-06 09:48:16,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2021-01-06 09:48:16,664 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 49 [2021-01-06 09:48:16,666 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:16,666 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2021-01-06 09:48:16,666 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2021-01-06 09:48:16,666 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2021-01-06 09:48:16,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-01-06 09:48:16,667 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:16,667 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:16,880 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-01-06 09:48:16,881 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:16,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:16,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1677996150, now seen corresponding path program 21 times [2021-01-06 09:48:16,882 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:16,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668498431] [2021-01-06 09:48:16,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:16,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:17,257 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-01-06 09:48:17,257 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668498431] [2021-01-06 09:48:17,258 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [926351695] [2021-01-06 09:48:17,258 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 09:48:28,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-01-06 09:48:28,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:28,907 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 23 conjunts are in the unsatisfiable core [2021-01-06 09:48:28,908 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:28,987 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2021-01-06 09:48:28,988 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:28,988 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2021-01-06 09:48:28,988 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063270012] [2021-01-06 09:48:28,989 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-01-06 09:48:28,989 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:28,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-01-06 09:48:28,990 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2021-01-06 09:48:28,990 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 25 states. [2021-01-06 09:48:29,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:29,075 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2021-01-06 09:48:29,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-01-06 09:48:29,076 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2021-01-06 09:48:29,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:29,077 INFO L225 Difference]: With dead ends: 86 [2021-01-06 09:48:29,077 INFO L226 Difference]: Without dead ends: 56 [2021-01-06 09:48:29,077 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2021-01-06 09:48:29,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-01-06 09:48:29,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2021-01-06 09:48:29,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2021-01-06 09:48:29,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2021-01-06 09:48:29,082 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2021-01-06 09:48:29,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:29,082 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2021-01-06 09:48:29,082 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2021-01-06 09:48:29,082 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2021-01-06 09:48:29,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-01-06 09:48:29,083 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:29,083 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:29,297 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-01-06 09:48:29,298 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:29,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:29,298 INFO L82 PathProgramCache]: Analyzing trace with hash 1745445335, now seen corresponding path program 22 times [2021-01-06 09:48:29,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:29,299 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1630646489] [2021-01-06 09:48:29,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:29,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:29,696 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-01-06 09:48:29,696 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1630646489] [2021-01-06 09:48:29,697 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488834537] [2021-01-06 09:48:29,697 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 09:48:29,770 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 09:48:29,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:48:29,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 24 conjunts are in the unsatisfiable core [2021-01-06 09:48:29,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:48:29,846 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-01-06 09:48:29,847 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:48:29,847 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2021-01-06 09:48:29,848 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966427682] [2021-01-06 09:48:29,848 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2021-01-06 09:48:29,849 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:48:29,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-01-06 09:48:29,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2021-01-06 09:48:29,850 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2021-01-06 09:48:29,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:48:29,948 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2021-01-06 09:48:29,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-01-06 09:48:29,948 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 53 [2021-01-06 09:48:29,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:48:29,949 INFO L225 Difference]: With dead ends: 89 [2021-01-06 09:48:29,949 INFO L226 Difference]: Without dead ends: 58 [2021-01-06 09:48:29,949 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2021-01-06 09:48:29,950 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-01-06 09:48:29,953 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-01-06 09:48:29,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2021-01-06 09:48:29,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2021-01-06 09:48:29,954 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2021-01-06 09:48:29,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:48:29,954 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2021-01-06 09:48:29,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2021-01-06 09:48:29,954 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2021-01-06 09:48:29,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-01-06 09:48:29,955 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:48:29,955 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:48:30,167 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:48:30,168 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:48:30,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:48:30,169 INFO L82 PathProgramCache]: Analyzing trace with hash -1621260458, now seen corresponding path program 23 times [2021-01-06 09:48:30,169 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:48:30,169 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164114287] [2021-01-06 09:48:30,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:48:30,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:48:30,615 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-01-06 09:48:30,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164114287] [2021-01-06 09:48:30,615 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093536990] [2021-01-06 09:48:30,615 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 09:50:05,028 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2021-01-06 09:50:05,028 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:50:05,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 25 conjunts are in the unsatisfiable core [2021-01-06 09:50:05,125 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:50:05,230 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2021-01-06 09:50:05,230 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:50:05,230 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2021-01-06 09:50:05,231 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466375159] [2021-01-06 09:50:05,231 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2021-01-06 09:50:05,231 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:50:05,232 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-01-06 09:50:05,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2021-01-06 09:50:05,233 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 27 states. [2021-01-06 09:50:05,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:50:05,361 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2021-01-06 09:50:05,362 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-01-06 09:50:05,362 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 55 [2021-01-06 09:50:05,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:50:05,363 INFO L225 Difference]: With dead ends: 92 [2021-01-06 09:50:05,363 INFO L226 Difference]: Without dead ends: 60 [2021-01-06 09:50:05,364 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2021-01-06 09:50:05,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-01-06 09:50:05,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2021-01-06 09:50:05,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2021-01-06 09:50:05,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2021-01-06 09:50:05,370 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2021-01-06 09:50:05,370 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:50:05,370 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2021-01-06 09:50:05,370 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2021-01-06 09:50:05,370 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2021-01-06 09:50:05,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-01-06 09:50:05,371 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:50:05,371 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:50:05,584 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-01-06 09:50:05,585 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:50:05,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:50:05,586 INFO L82 PathProgramCache]: Analyzing trace with hash 757173367, now seen corresponding path program 24 times [2021-01-06 09:50:05,586 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:50:05,586 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [661487101] [2021-01-06 09:50:05,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:50:05,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:50:06,103 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-01-06 09:50:06,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [661487101] [2021-01-06 09:50:06,103 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [377388516] [2021-01-06 09:50:06,103 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 09:50:17,709 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2021-01-06 09:50:17,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:50:17,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 26 conjunts are in the unsatisfiable core [2021-01-06 09:50:17,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:50:17,810 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2021-01-06 09:50:17,814 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:50:17,815 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2021-01-06 09:50:17,819 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676326319] [2021-01-06 09:50:17,820 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2021-01-06 09:50:17,820 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:50:17,821 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-01-06 09:50:17,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2021-01-06 09:50:17,821 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 28 states. [2021-01-06 09:50:17,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:50:17,924 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2021-01-06 09:50:17,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-01-06 09:50:17,924 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 57 [2021-01-06 09:50:17,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:50:17,925 INFO L225 Difference]: With dead ends: 95 [2021-01-06 09:50:17,925 INFO L226 Difference]: Without dead ends: 62 [2021-01-06 09:50:17,926 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2021-01-06 09:50:17,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-01-06 09:50:17,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-01-06 09:50:17,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2021-01-06 09:50:17,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2021-01-06 09:50:17,930 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 57 [2021-01-06 09:50:17,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:50:17,931 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2021-01-06 09:50:17,931 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2021-01-06 09:50:17,931 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2021-01-06 09:50:17,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-01-06 09:50:17,931 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:50:17,931 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:50:18,145 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 09:50:18,146 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:50:18,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:50:18,146 INFO L82 PathProgramCache]: Analyzing trace with hash -612501962, now seen corresponding path program 25 times [2021-01-06 09:50:18,147 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:50:18,147 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [816520625] [2021-01-06 09:50:18,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:50:18,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:50:18,650 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-01-06 09:50:18,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [816520625] [2021-01-06 09:50:18,651 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724685688] [2021-01-06 09:50:18,651 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 09:50:18,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:50:18,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 27 conjunts are in the unsatisfiable core [2021-01-06 09:50:18,734 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:50:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2021-01-06 09:50:18,810 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:50:18,810 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2021-01-06 09:50:18,810 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367689250] [2021-01-06 09:50:18,811 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2021-01-06 09:50:18,811 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:50:18,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-01-06 09:50:18,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2021-01-06 09:50:18,812 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 29 states. [2021-01-06 09:50:18,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:50:18,924 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2021-01-06 09:50:18,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-01-06 09:50:18,926 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 59 [2021-01-06 09:50:18,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:50:18,927 INFO L225 Difference]: With dead ends: 98 [2021-01-06 09:50:18,927 INFO L226 Difference]: Without dead ends: 64 [2021-01-06 09:50:18,927 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2021-01-06 09:50:18,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-01-06 09:50:18,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-01-06 09:50:18,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2021-01-06 09:50:18,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2021-01-06 09:50:18,931 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2021-01-06 09:50:18,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:50:18,931 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2021-01-06 09:50:18,932 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2021-01-06 09:50:18,932 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2021-01-06 09:50:18,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-01-06 09:50:18,932 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:50:18,932 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:50:19,147 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-01-06 09:50:19,148 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:50:19,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:50:19,149 INFO L82 PathProgramCache]: Analyzing trace with hash 327606039, now seen corresponding path program 26 times [2021-01-06 09:50:19,149 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:50:19,149 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1703340918] [2021-01-06 09:50:19,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:50:19,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:50:19,761 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-01-06 09:50:19,761 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1703340918] [2021-01-06 09:50:19,762 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [772493110] [2021-01-06 09:50:19,762 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 09:50:19,857 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 09:50:19,858 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:50:19,860 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 28 conjunts are in the unsatisfiable core [2021-01-06 09:50:19,862 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:50:19,934 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-01-06 09:50:19,934 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:50:19,934 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2021-01-06 09:50:19,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471840604] [2021-01-06 09:50:19,935 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2021-01-06 09:50:19,935 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:50:19,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-01-06 09:50:19,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2021-01-06 09:50:19,936 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 30 states. [2021-01-06 09:50:20,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:50:20,050 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2021-01-06 09:50:20,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-01-06 09:50:20,051 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 61 [2021-01-06 09:50:20,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:50:20,052 INFO L225 Difference]: With dead ends: 101 [2021-01-06 09:50:20,052 INFO L226 Difference]: Without dead ends: 66 [2021-01-06 09:50:20,053 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2021-01-06 09:50:20,053 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-01-06 09:50:20,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-01-06 09:50:20,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2021-01-06 09:50:20,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2021-01-06 09:50:20,056 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 61 [2021-01-06 09:50:20,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:50:20,057 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2021-01-06 09:50:20,057 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2021-01-06 09:50:20,057 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2021-01-06 09:50:20,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-01-06 09:50:20,057 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:50:20,057 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:50:20,272 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-01-06 09:50:20,272 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:50:20,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:50:20,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1579713258, now seen corresponding path program 27 times [2021-01-06 09:50:20,273 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:50:20,273 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1886654386] [2021-01-06 09:50:20,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:50:20,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:50:20,811 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2021-01-06 09:50:20,811 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1886654386] [2021-01-06 09:50:20,811 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [221816373] [2021-01-06 09:50:20,812 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 09:50:45,511 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2021-01-06 09:50:45,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:50:45,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 50 conjunts are in the unsatisfiable core [2021-01-06 09:50:45,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:50:45,670 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 27 proven. 378 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-01-06 09:50:45,670 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:50:45,670 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 32 [2021-01-06 09:50:45,671 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802715074] [2021-01-06 09:50:45,671 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-01-06 09:50:45,671 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:50:45,672 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-01-06 09:50:45,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2021-01-06 09:50:45,672 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2021-01-06 09:50:45,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:50:45,785 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2021-01-06 09:50:45,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-01-06 09:50:45,786 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 63 [2021-01-06 09:50:45,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:50:45,787 INFO L225 Difference]: With dead ends: 104 [2021-01-06 09:50:45,787 INFO L226 Difference]: Without dead ends: 68 [2021-01-06 09:50:45,788 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2021-01-06 09:50:45,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-01-06 09:50:45,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-01-06 09:50:45,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2021-01-06 09:50:45,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-01-06 09:50:45,791 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2021-01-06 09:50:45,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:50:45,791 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-01-06 09:50:45,791 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2021-01-06 09:50:45,791 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-01-06 09:50:45,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-01-06 09:50:45,792 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:50:45,792 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:50:46,005 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-01-06 09:50:46,006 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:50:46,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:50:46,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1164401079, now seen corresponding path program 28 times [2021-01-06 09:50:46,006 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:50:46,007 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1404066852] [2021-01-06 09:50:46,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:50:46,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:50:46,687 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 09:50:46,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1404066852] [2021-01-06 09:50:46,687 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1520436648] [2021-01-06 09:50:46,687 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 09:50:46,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-01-06 09:50:46,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 09:50:46,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 30 conjunts are in the unsatisfiable core [2021-01-06 09:50:46,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 09:50:46,881 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2021-01-06 09:50:46,881 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 09:50:46,881 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2021-01-06 09:50:46,882 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617326376] [2021-01-06 09:50:46,882 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2021-01-06 09:50:46,882 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 09:50:46,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-01-06 09:50:46,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2021-01-06 09:50:46,884 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 32 states. [2021-01-06 09:50:47,033 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 09:50:47,033 INFO L93 Difference]: Finished difference Result 107 states and 112 transitions. [2021-01-06 09:50:47,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-01-06 09:50:47,034 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2021-01-06 09:50:47,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 09:50:47,035 INFO L225 Difference]: With dead ends: 107 [2021-01-06 09:50:47,035 INFO L226 Difference]: Without dead ends: 70 [2021-01-06 09:50:47,038 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2021-01-06 09:50:47,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-01-06 09:50:47,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-01-06 09:50:47,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2021-01-06 09:50:47,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2021-01-06 09:50:47,043 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2021-01-06 09:50:47,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 09:50:47,043 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2021-01-06 09:50:47,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2021-01-06 09:50:47,043 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2021-01-06 09:50:47,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-01-06 09:50:47,044 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 09:50:47,044 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 09:50:47,258 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-01-06 09:50:47,259 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 09:50:47,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 09:50:47,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1151591434, now seen corresponding path program 29 times [2021-01-06 09:50:47,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 09:50:47,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897123720] [2021-01-06 09:50:47,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 09:50:47,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 09:50:47,834 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2021-01-06 09:50:47,834 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897123720] [2021-01-06 09:50:47,834 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [112903775] [2021-01-06 09:50:47,834 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