/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-dcfa08f [2020-12-22 23:58:21,631 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 23:58:21,634 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 23:58:21,671 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 23:58:21,671 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 23:58:21,673 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 23:58:21,675 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 23:58:21,677 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 23:58:21,680 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 23:58:21,681 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 23:58:21,682 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 23:58:21,684 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 23:58:21,684 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 23:58:21,686 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 23:58:21,687 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 23:58:21,689 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 23:58:21,703 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 23:58:21,704 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 23:58:21,709 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 23:58:21,717 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 23:58:21,722 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 23:58:21,725 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 23:58:21,726 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 23:58:21,729 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 23:58:21,738 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 23:58:21,757 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 23:58:21,759 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 23:58:21,764 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 23:58:21,768 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 23:58:21,826 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 23:58:21,827 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 23:58:21,829 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 23:58:21,829 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 23:58:21,829 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 23:58:21,830 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 23:58:21,830 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 23:58:21,830 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 23:58:21,830 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 23:58:21,830 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 23:58:21,831 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 23:58:21,831 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 23:58:21,832 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 23:58:21,832 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 23:58:21,833 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 23:58:21,833 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 23:58:21,833 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 23:58:21,833 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 23:58:21,834 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 23:58:21,834 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 23:58:21,834 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 23:58:21,834 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 23:58:21,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 23:58:21,835 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 23:58:21,841 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 23:58:21,841 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 23:58:22,257 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 23:58:22,305 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 23:58:22,309 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 23:58:22,310 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 23:58:22,311 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 23:58:22,312 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/array-examples/standard_init2_ground-1.i [2020-12-22 23:58:22,409 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9ee87a431/2255821fd00c44ba90a14d9d225a9989/FLAG7c50724df [2020-12-22 23:58:23,089 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 23:58:23,090 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/array-examples/standard_init2_ground-1.i [2020-12-22 23:58:23,103 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9ee87a431/2255821fd00c44ba90a14d9d225a9989/FLAG7c50724df [2020-12-22 23:58:23,468 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/9ee87a431/2255821fd00c44ba90a14d9d225a9989 [2020-12-22 23:58:23,472 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 23:58:23,475 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 23:58:23,478 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 23:58:23,479 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 23:58:23,483 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 23:58:23,485 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,488 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4a2a1139 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23, skipping insertion in model container [2020-12-22 23:58:23,489 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,502 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 23:58:23,521 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 23:58:23,757 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,] [2020-12-22 23:58:23,778 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 23:58:23,787 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 23:58:23,799 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,] [2020-12-22 23:58:23,806 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 23:58:23,821 INFO L208 MainTranslator]: Completed translation [2020-12-22 23:58:23,821 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23 WrapperNode [2020-12-22 23:58:23,821 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 23:58:23,822 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 23:58:23,823 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 23:58:23,823 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 23:58:23,831 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,839 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,859 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 23:58:23,860 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 23:58:23,861 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 23:58:23,861 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 23:58:23,870 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,871 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,872 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,873 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,878 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,883 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,885 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (1/1) ... [2020-12-22 23:58:23,887 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 23:58:23,889 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 23:58:23,889 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 23:58:23,889 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 23:58:23,890 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (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 [2020-12-22 23:58:24,013 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 23:58:24,014 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 23:58:24,015 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-12-22 23:58:24,015 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 23:58:24,015 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 23:58:24,015 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-12-22 23:58:24,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-12-22 23:58:24,308 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 23:58:24,309 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-22 23:58:24,314 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 11:58:24 BoogieIcfgContainer [2020-12-22 23:58:24,315 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 23:58:24,358 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 23:58:24,359 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 23:58:24,364 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 23:58:24,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 11:58:23" (1/3) ... [2020-12-22 23:58:24,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52f7f6ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 11:58:24, skipping insertion in model container [2020-12-22 23:58:24,369 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 11:58:23" (2/3) ... [2020-12-22 23:58:24,372 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52f7f6ac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 11:58:24, skipping insertion in model container [2020-12-22 23:58:24,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 11:58:24" (3/3) ... [2020-12-22 23:58:24,375 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_init2_ground-1.i [2020-12-22 23:58:24,395 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 23:58:24,407 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 23:58:24,468 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 23:58:24,502 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 23:58:24,503 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 23:58:24,503 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 23:58:24,503 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 23:58:24,504 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 23:58:24,504 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 23:58:24,504 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 23:58:24,504 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 23:58:24,521 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states. [2020-12-22 23:58:24,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-22 23:58:24,528 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:24,529 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:24,529 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:24,536 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:24,536 INFO L82 PathProgramCache]: Analyzing trace with hash -1157636873, now seen corresponding path program 1 times [2020-12-22 23:58:24,547 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:24,548 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1532294949] [2020-12-22 23:58:24,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:24,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:24,745 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 23:58:24,746 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1532294949] [2020-12-22 23:58:24,747 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 23:58:24,747 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-22 23:58:24,748 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667879769] [2020-12-22 23:58:24,757 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-22 23:58:24,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:24,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-22 23:58:24,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-22 23:58:24,794 INFO L87 Difference]: Start difference. First operand 16 states. Second operand 3 states. [2020-12-22 23:58:24,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:24,858 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2020-12-22 23:58:24,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-22 23:58:24,860 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-12-22 23:58:24,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:24,879 INFO L225 Difference]: With dead ends: 31 [2020-12-22 23:58:24,880 INFO L226 Difference]: Without dead ends: 14 [2020-12-22 23:58:24,885 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 [2020-12-22 23:58:24,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-12-22 23:58:24,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-12-22 23:58:24,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-12-22 23:58:24,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-12-22 23:58:24,930 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 9 [2020-12-22 23:58:24,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:24,931 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-12-22 23:58:24,931 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-22 23:58:24,932 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-12-22 23:58:24,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-22 23:58:24,934 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:24,934 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:24,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 23:58:24,935 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:24,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:24,940 INFO L82 PathProgramCache]: Analyzing trace with hash 970257334, now seen corresponding path program 1 times [2020-12-22 23:58:24,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:24,941 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1989101266] [2020-12-22 23:58:24,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:24,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:25,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-22 23:58:25,043 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1989101266] [2020-12-22 23:58:25,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [722348110] [2020-12-22 23:58:25,044 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 [2020-12-22 23:58:25,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:25,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-22 23:58:25,105 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:25,169 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-22 23:58:25,169 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:25,169 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-22 23:58:25,171 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049839963] [2020-12-22 23:58:25,171 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 23:58:25,172 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:25,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 23:58:25,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-12-22 23:58:25,173 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 5 states. [2020-12-22 23:58:25,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:25,200 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-12-22 23:58:25,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-22 23:58:25,201 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2020-12-22 23:58:25,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:25,202 INFO L225 Difference]: With dead ends: 26 [2020-12-22 23:58:25,202 INFO L226 Difference]: Without dead ends: 16 [2020-12-22 23:58:25,203 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 [2020-12-22 23:58:25,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-12-22 23:58:25,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-12-22 23:58:25,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-12-22 23:58:25,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-12-22 23:58:25,208 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2020-12-22 23:58:25,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:25,208 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-12-22 23:58:25,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 23:58:25,209 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-12-22 23:58:25,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-12-22 23:58:25,209 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:25,210 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:25,424 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-22 23:58:25,425 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:25,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:25,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1117998999, now seen corresponding path program 2 times [2020-12-22 23:58:25,428 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:25,428 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603064332] [2020-12-22 23:58:25,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:25,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:25,491 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-22 23:58:25,491 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [603064332] [2020-12-22 23:58:25,492 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1500100697] [2020-12-22 23:58:25,492 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 [2020-12-22 23:58:25,559 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 23:58:25,559 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:25,561 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 4 conjunts are in the unsatisfiable core [2020-12-22 23:58:25,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:25,628 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-12-22 23:58:25,628 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:25,628 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-22 23:58:25,629 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431631667] [2020-12-22 23:58:25,629 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-22 23:58:25,630 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:25,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-22 23:58:25,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-12-22 23:58:25,631 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-12-22 23:58:25,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:25,695 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-12-22 23:58:25,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 23:58:25,696 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-12-22 23:58:25,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:25,698 INFO L225 Difference]: With dead ends: 29 [2020-12-22 23:58:25,698 INFO L226 Difference]: Without dead ends: 18 [2020-12-22 23:58:25,699 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 [2020-12-22 23:58:25,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-12-22 23:58:25,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-12-22 23:58:25,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-12-22 23:58:25,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-12-22 23:58:25,710 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2020-12-22 23:58:25,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:25,711 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-12-22 23:58:25,711 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-22 23:58:25,711 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-12-22 23:58:25,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-12-22 23:58:25,713 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:25,713 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:25,927 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:25,928 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:25,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:25,930 INFO L82 PathProgramCache]: Analyzing trace with hash -1025156458, now seen corresponding path program 3 times [2020-12-22 23:58:25,931 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:25,931 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1479951443] [2020-12-22 23:58:25,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:25,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:26,051 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-22 23:58:26,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1479951443] [2020-12-22 23:58:26,052 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1020319017] [2020-12-22 23:58:26,053 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 [2020-12-22 23:58:26,115 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-22 23:58:26,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:26,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-22 23:58:26,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:26,165 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-12-22 23:58:26,166 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:26,166 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-22 23:58:26,167 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [322726307] [2020-12-22 23:58:26,167 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-22 23:58:26,167 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:26,168 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-22 23:58:26,169 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-12-22 23:58:26,169 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-12-22 23:58:26,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:26,201 INFO L93 Difference]: Finished difference Result 32 states and 37 transitions. [2020-12-22 23:58:26,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-22 23:58:26,202 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2020-12-22 23:58:26,202 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:26,203 INFO L225 Difference]: With dead ends: 32 [2020-12-22 23:58:26,203 INFO L226 Difference]: Without dead ends: 20 [2020-12-22 23:58:26,206 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 [2020-12-22 23:58:26,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-12-22 23:58:26,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-12-22 23:58:26,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-12-22 23:58:26,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-12-22 23:58:26,216 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2020-12-22 23:58:26,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:26,217 INFO L481 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-12-22 23:58:26,217 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-22 23:58:26,217 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-12-22 23:58:26,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-22 23:58:26,218 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:26,218 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:26,435 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:26,436 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:26,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:26,437 INFO L82 PathProgramCache]: Analyzing trace with hash -57021897, now seen corresponding path program 4 times [2020-12-22 23:58:26,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:26,439 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1840883547] [2020-12-22 23:58:26,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:26,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:26,514 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 23:58:26,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1840883547] [2020-12-22 23:58:26,515 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964956835] [2020-12-22 23:58:26,516 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 [2020-12-22 23:58:26,592 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 23:58:26,592 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:26,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-22 23:58:26,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:26,688 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 23:58:26,689 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:26,689 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-22 23:58:26,689 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1555301872] [2020-12-22 23:58:26,690 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 23:58:26,690 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:26,691 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 23:58:26,691 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-12-22 23:58:26,691 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 8 states. [2020-12-22 23:58:26,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:26,735 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2020-12-22 23:58:26,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-22 23:58:26,735 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-12-22 23:58:26,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:26,736 INFO L225 Difference]: With dead ends: 35 [2020-12-22 23:58:26,736 INFO L226 Difference]: Without dead ends: 22 [2020-12-22 23:58:26,737 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 [2020-12-22 23:58:26,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-12-22 23:58:26,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-12-22 23:58:26,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-12-22 23:58:26,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-12-22 23:58:26,742 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 17 [2020-12-22 23:58:26,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:26,742 INFO L481 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-12-22 23:58:26,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 23:58:26,742 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-12-22 23:58:26,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-12-22 23:58:26,743 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:26,746 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:26,946 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:26,947 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:26,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:26,948 INFO L82 PathProgramCache]: Analyzing trace with hash 315152758, now seen corresponding path program 5 times [2020-12-22 23:58:26,949 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:26,949 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [599844776] [2020-12-22 23:58:26,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:26,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:27,044 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-22 23:58:27,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [599844776] [2020-12-22 23:58:27,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [776367993] [2020-12-22 23:58:27,046 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 [2020-12-22 23:58:27,148 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-22 23:58:27,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:27,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-22 23:58:27,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:27,197 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-12-22 23:58:27,198 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:27,198 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-22 23:58:27,198 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666065864] [2020-12-22 23:58:27,199 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-22 23:58:27,199 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:27,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-22 23:58:27,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-12-22 23:58:27,200 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 9 states. [2020-12-22 23:58:27,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:27,239 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-12-22 23:58:27,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 23:58:27,240 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-12-22 23:58:27,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:27,243 INFO L225 Difference]: With dead ends: 38 [2020-12-22 23:58:27,244 INFO L226 Difference]: Without dead ends: 24 [2020-12-22 23:58:27,246 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 [2020-12-22 23:58:27,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-12-22 23:58:27,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-12-22 23:58:27,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-12-22 23:58:27,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-12-22 23:58:27,254 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 19 [2020-12-22 23:58:27,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:27,254 INFO L481 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-12-22 23:58:27,255 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-22 23:58:27,255 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-12-22 23:58:27,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-12-22 23:58:27,256 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:27,257 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:27,471 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-22 23:58:27,472 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:27,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:27,472 INFO L82 PathProgramCache]: Analyzing trace with hash -846091049, now seen corresponding path program 6 times [2020-12-22 23:58:27,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:27,473 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272998118] [2020-12-22 23:58:27,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:27,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:27,613 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-22 23:58:27,613 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272998118] [2020-12-22 23:58:27,613 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791124383] [2020-12-22 23:58:27,613 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 [2020-12-22 23:58:27,694 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-22 23:58:27,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:27,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 23:58:27,697 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:27,771 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-12-22 23:58:27,771 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:27,771 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-22 23:58:27,772 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466983629] [2020-12-22 23:58:27,772 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-22 23:58:27,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:27,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-22 23:58:27,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2020-12-22 23:58:27,773 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 10 states. [2020-12-22 23:58:27,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:27,832 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2020-12-22 23:58:27,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-22 23:58:27,833 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 21 [2020-12-22 23:58:27,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:27,834 INFO L225 Difference]: With dead ends: 41 [2020-12-22 23:58:27,834 INFO L226 Difference]: Without dead ends: 26 [2020-12-22 23:58:27,835 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 [2020-12-22 23:58:27,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-12-22 23:58:27,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-12-22 23:58:27,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-12-22 23:58:27,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-12-22 23:58:27,853 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2020-12-22 23:58:27,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:27,854 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-12-22 23:58:27,856 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-22 23:58:27,856 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-12-22 23:58:27,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-12-22 23:58:27,857 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:27,857 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:28,057 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:28,059 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:28,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:28,060 INFO L82 PathProgramCache]: Analyzing trace with hash 401698902, now seen corresponding path program 7 times [2020-12-22 23:58:28,060 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:28,061 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978677408] [2020-12-22 23:58:28,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:28,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:28,170 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-22 23:58:28,170 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978677408] [2020-12-22 23:58:28,171 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1514101322] [2020-12-22 23:58:28,171 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 [2020-12-22 23:58:28,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:28,244 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-22 23:58:28,246 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:28,306 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-12-22 23:58:28,307 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:28,307 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 11 [2020-12-22 23:58:28,307 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879898260] [2020-12-22 23:58:28,308 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-12-22 23:58:28,308 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:28,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-12-22 23:58:28,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2020-12-22 23:58:28,309 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 11 states. [2020-12-22 23:58:28,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:28,364 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-12-22 23:58:28,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-12-22 23:58:28,364 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 23 [2020-12-22 23:58:28,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:28,365 INFO L225 Difference]: With dead ends: 44 [2020-12-22 23:58:28,365 INFO L226 Difference]: Without dead ends: 28 [2020-12-22 23:58:28,366 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 [2020-12-22 23:58:28,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-12-22 23:58:28,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-12-22 23:58:28,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-12-22 23:58:28,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-12-22 23:58:28,371 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2020-12-22 23:58:28,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:28,372 INFO L481 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-12-22 23:58:28,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-12-22 23:58:28,372 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-12-22 23:58:28,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-12-22 23:58:28,373 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:28,373 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:28,580 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:28,580 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:28,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:28,581 INFO L82 PathProgramCache]: Analyzing trace with hash -88565897, now seen corresponding path program 8 times [2020-12-22 23:58:28,582 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:28,583 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [190947871] [2020-12-22 23:58:28,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:28,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:28,706 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-22 23:58:28,706 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [190947871] [2020-12-22 23:58:28,706 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412839352] [2020-12-22 23:58:28,707 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 [2020-12-22 23:58:28,768 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 23:58:28,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:28,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-22 23:58:28,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:28,829 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2020-12-22 23:58:28,830 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:28,830 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-22 23:58:28,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2042142729] [2020-12-22 23:58:28,831 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-22 23:58:28,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:28,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-22 23:58:28,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2020-12-22 23:58:28,832 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 12 states. [2020-12-22 23:58:28,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:28,881 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2020-12-22 23:58:28,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-22 23:58:28,882 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2020-12-22 23:58:28,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:28,883 INFO L225 Difference]: With dead ends: 47 [2020-12-22 23:58:28,883 INFO L226 Difference]: Without dead ends: 30 [2020-12-22 23:58:28,883 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 [2020-12-22 23:58:28,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-12-22 23:58:28,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-12-22 23:58:28,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-12-22 23:58:28,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-12-22 23:58:28,888 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2020-12-22 23:58:28,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:28,888 INFO L481 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-12-22 23:58:28,888 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-22 23:58:28,888 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-12-22 23:58:28,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-12-22 23:58:28,889 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:28,889 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:29,103 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-12-22 23:58:29,104 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:29,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:29,105 INFO L82 PathProgramCache]: Analyzing trace with hash -1068425418, now seen corresponding path program 9 times [2020-12-22 23:58:29,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:29,106 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862144902] [2020-12-22 23:58:29,106 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:29,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:29,280 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-22 23:58:29,281 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862144902] [2020-12-22 23:58:29,281 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1086347734] [2020-12-22 23:58:29,281 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 [2020-12-22 23:58:29,516 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2020-12-22 23:58:29,516 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:29,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-22 23:58:29,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:29,608 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2020-12-22 23:58:29,608 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:29,608 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 13 [2020-12-22 23:58:29,609 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263420546] [2020-12-22 23:58:29,610 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-12-22 23:58:29,611 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:29,611 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-12-22 23:58:29,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=78, Unknown=0, NotChecked=0, Total=156 [2020-12-22 23:58:29,616 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 13 states. [2020-12-22 23:58:29,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:29,674 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-12-22 23:58:29,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-22 23:58:29,674 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 27 [2020-12-22 23:58:29,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:29,675 INFO L225 Difference]: With dead ends: 50 [2020-12-22 23:58:29,675 INFO L226 Difference]: Without dead ends: 32 [2020-12-22 23:58:29,676 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 [2020-12-22 23:58:29,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-12-22 23:58:29,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-12-22 23:58:29,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-12-22 23:58:29,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-12-22 23:58:29,681 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2020-12-22 23:58:29,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:29,681 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-12-22 23:58:29,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-12-22 23:58:29,681 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-12-22 23:58:29,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-12-22 23:58:29,682 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:29,682 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:29,897 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:29,898 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:29,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:29,899 INFO L82 PathProgramCache]: Analyzing trace with hash 163359255, now seen corresponding path program 10 times [2020-12-22 23:58:29,900 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:29,900 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870087566] [2020-12-22 23:58:29,900 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:29,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:30,105 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-22 23:58:30,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870087566] [2020-12-22 23:58:30,106 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686247591] [2020-12-22 23:58:30,107 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 [2020-12-22 23:58:30,161 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 23:58:30,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:30,163 INFO L263 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 12 conjunts are in the unsatisfiable core [2020-12-22 23:58:30,165 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:30,211 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2020-12-22 23:58:30,212 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:30,212 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 14 [2020-12-22 23:58:30,212 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440297560] [2020-12-22 23:58:30,213 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-12-22 23:58:30,213 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:30,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-12-22 23:58:30,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2020-12-22 23:58:30,214 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 14 states. [2020-12-22 23:58:30,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:30,274 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2020-12-22 23:58:30,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-12-22 23:58:30,275 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 29 [2020-12-22 23:58:30,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:30,281 INFO L225 Difference]: With dead ends: 53 [2020-12-22 23:58:30,281 INFO L226 Difference]: Without dead ends: 34 [2020-12-22 23:58:30,282 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 [2020-12-22 23:58:30,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-12-22 23:58:30,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-12-22 23:58:30,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-12-22 23:58:30,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-12-22 23:58:30,300 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2020-12-22 23:58:30,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:30,300 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-12-22 23:58:30,300 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-12-22 23:58:30,300 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-12-22 23:58:30,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-22 23:58:30,302 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:30,302 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:30,516 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:30,517 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:30,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:30,518 INFO L82 PathProgramCache]: Analyzing trace with hash 425322006, now seen corresponding path program 11 times [2020-12-22 23:58:30,519 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:30,519 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746245177] [2020-12-22 23:58:30,520 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:30,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:30,689 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-22 23:58:30,689 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746245177] [2020-12-22 23:58:30,690 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012510858] [2020-12-22 23:58:30,690 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 [2020-12-22 23:58:31,124 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2020-12-22 23:58:31,124 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:31,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 13 conjunts are in the unsatisfiable core [2020-12-22 23:58:31,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:31,177 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-12-22 23:58:31,177 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:31,177 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-22 23:58:31,178 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25765090] [2020-12-22 23:58:31,178 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-22 23:58:31,178 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:31,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-22 23:58:31,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=105, Unknown=0, NotChecked=0, Total=210 [2020-12-22 23:58:31,179 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 15 states. [2020-12-22 23:58:31,239 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:31,239 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2020-12-22 23:58:31,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-12-22 23:58:31,239 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2020-12-22 23:58:31,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:31,240 INFO L225 Difference]: With dead ends: 56 [2020-12-22 23:58:31,240 INFO L226 Difference]: Without dead ends: 36 [2020-12-22 23:58:31,241 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 [2020-12-22 23:58:31,242 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-12-22 23:58:31,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-12-22 23:58:31,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-12-22 23:58:31,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-12-22 23:58:31,247 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-12-22 23:58:31,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:31,247 INFO L481 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-12-22 23:58:31,247 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-22 23:58:31,247 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-12-22 23:58:31,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-12-22 23:58:31,248 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:31,248 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:31,452 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-12-22 23:58:31,453 INFO L429 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:31,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:31,454 INFO L82 PathProgramCache]: Analyzing trace with hash -1597250377, now seen corresponding path program 12 times [2020-12-22 23:58:31,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:31,454 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [809858967] [2020-12-22 23:58:31,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:31,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:31,675 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-22 23:58:31,675 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [809858967] [2020-12-22 23:58:31,676 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1117142456] [2020-12-22 23:58:31,676 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 [2020-12-22 23:58:32,232 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2020-12-22 23:58:32,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:32,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 14 conjunts are in the unsatisfiable core [2020-12-22 23:58:32,238 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:32,311 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-12-22 23:58:32,312 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:32,312 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 16 [2020-12-22 23:58:32,312 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [51481426] [2020-12-22 23:58:32,313 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-12-22 23:58:32,313 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:32,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-12-22 23:58:32,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=120, Unknown=0, NotChecked=0, Total=240 [2020-12-22 23:58:32,314 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 16 states. [2020-12-22 23:58:32,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:32,365 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2020-12-22 23:58:32,365 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-22 23:58:32,365 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 33 [2020-12-22 23:58:32,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:32,366 INFO L225 Difference]: With dead ends: 59 [2020-12-22 23:58:32,366 INFO L226 Difference]: Without dead ends: 38 [2020-12-22 23:58:32,367 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 [2020-12-22 23:58:32,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-12-22 23:58:32,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-12-22 23:58:32,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-12-22 23:58:32,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-12-22 23:58:32,371 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 33 [2020-12-22 23:58:32,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:32,372 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-12-22 23:58:32,372 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-12-22 23:58:32,372 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-12-22 23:58:32,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-12-22 23:58:32,372 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:32,373 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:32,588 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-12-22 23:58:32,589 INFO L429 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:32,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:32,590 INFO L82 PathProgramCache]: Analyzing trace with hash 1878902006, now seen corresponding path program 13 times [2020-12-22 23:58:32,590 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:32,593 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771315720] [2020-12-22 23:58:32,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:32,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:32,809 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-22 23:58:32,810 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771315720] [2020-12-22 23:58:32,811 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95159153] [2020-12-22 23:58:32,811 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 [2020-12-22 23:58:32,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:32,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 15 conjunts are in the unsatisfiable core [2020-12-22 23:58:32,884 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:32,954 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2020-12-22 23:58:32,955 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:32,955 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 17 [2020-12-22 23:58:32,955 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785571645] [2020-12-22 23:58:32,955 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-12-22 23:58:32,956 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:32,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-12-22 23:58:32,957 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2020-12-22 23:58:32,957 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 17 states. [2020-12-22 23:58:33,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:33,019 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-12-22 23:58:33,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-12-22 23:58:33,020 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 35 [2020-12-22 23:58:33,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:33,020 INFO L225 Difference]: With dead ends: 62 [2020-12-22 23:58:33,020 INFO L226 Difference]: Without dead ends: 40 [2020-12-22 23:58:33,021 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 [2020-12-22 23:58:33,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-12-22 23:58:33,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-12-22 23:58:33,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-12-22 23:58:33,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-12-22 23:58:33,026 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2020-12-22 23:58:33,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:33,026 INFO L481 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-12-22 23:58:33,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-12-22 23:58:33,027 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-12-22 23:58:33,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-12-22 23:58:33,027 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:33,028 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:33,241 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-12-22 23:58:33,242 INFO L429 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:33,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:33,243 INFO L82 PathProgramCache]: Analyzing trace with hash 1720993623, now seen corresponding path program 14 times [2020-12-22 23:58:33,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:33,243 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166849386] [2020-12-22 23:58:33,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:33,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:33,458 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-22 23:58:33,459 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166849386] [2020-12-22 23:58:33,459 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [7932048] [2020-12-22 23:58:33,459 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 [2020-12-22 23:58:33,520 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 23:58:33,520 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:33,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 16 conjunts are in the unsatisfiable core [2020-12-22 23:58:33,524 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:33,583 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-22 23:58:33,583 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:33,583 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 18 [2020-12-22 23:58:33,584 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523778961] [2020-12-22 23:58:33,584 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-22 23:58:33,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:33,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-22 23:58:33,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2020-12-22 23:58:33,586 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 18 states. [2020-12-22 23:58:33,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:33,655 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2020-12-22 23:58:33,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-12-22 23:58:33,655 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 37 [2020-12-22 23:58:33,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:33,659 INFO L225 Difference]: With dead ends: 65 [2020-12-22 23:58:33,659 INFO L226 Difference]: Without dead ends: 42 [2020-12-22 23:58:33,663 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 [2020-12-22 23:58:33,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-12-22 23:58:33,667 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-12-22 23:58:33,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-12-22 23:58:33,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-12-22 23:58:33,668 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2020-12-22 23:58:33,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:33,668 INFO L481 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-12-22 23:58:33,668 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-22 23:58:33,668 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-12-22 23:58:33,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-12-22 23:58:33,669 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:33,669 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:33,885 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:33,886 INFO L429 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:33,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:33,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1890499542, now seen corresponding path program 15 times [2020-12-22 23:58:33,887 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:33,887 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224019529] [2020-12-22 23:58:33,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:33,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:34,080 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-22 23:58:34,081 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224019529] [2020-12-22 23:58:34,081 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1907618385] [2020-12-22 23:58:34,081 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 [2020-12-22 23:58:34,872 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-22 23:58:34,872 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:34,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-22 23:58:34,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:34,951 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2020-12-22 23:58:34,952 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:34,952 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 19 [2020-12-22 23:58:34,952 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289629249] [2020-12-22 23:58:34,952 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-12-22 23:58:34,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:34,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-12-22 23:58:34,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2020-12-22 23:58:34,954 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 19 states. [2020-12-22 23:58:35,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:35,035 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2020-12-22 23:58:35,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-12-22 23:58:35,035 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 39 [2020-12-22 23:58:35,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:35,036 INFO L225 Difference]: With dead ends: 68 [2020-12-22 23:58:35,036 INFO L226 Difference]: Without dead ends: 44 [2020-12-22 23:58:35,039 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 [2020-12-22 23:58:35,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-12-22 23:58:35,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-12-22 23:58:35,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-12-22 23:58:35,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-12-22 23:58:35,045 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 39 [2020-12-22 23:58:35,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:35,046 INFO L481 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-12-22 23:58:35,046 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-12-22 23:58:35,046 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-12-22 23:58:35,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-12-22 23:58:35,047 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:35,047 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:35,261 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-12-22 23:58:35,262 INFO L429 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:35,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:35,263 INFO L82 PathProgramCache]: Analyzing trace with hash -498871817, now seen corresponding path program 16 times [2020-12-22 23:58:35,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:35,264 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1682081200] [2020-12-22 23:58:35,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:35,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:35,527 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-22 23:58:35,527 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1682081200] [2020-12-22 23:58:35,527 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708540753] [2020-12-22 23:58:35,528 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 [2020-12-22 23:58:35,593 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 23:58:35,594 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:35,595 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-22 23:58:35,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:35,679 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2020-12-22 23:58:35,680 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:35,680 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 20 [2020-12-22 23:58:35,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650520707] [2020-12-22 23:58:35,681 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-12-22 23:58:35,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:35,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-12-22 23:58:35,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-22 23:58:35,686 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 20 states. [2020-12-22 23:58:35,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:35,760 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2020-12-22 23:58:35,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-12-22 23:58:35,761 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2020-12-22 23:58:35,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:35,762 INFO L225 Difference]: With dead ends: 71 [2020-12-22 23:58:35,762 INFO L226 Difference]: Without dead ends: 46 [2020-12-22 23:58:35,762 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2020-12-22 23:58:35,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-12-22 23:58:35,766 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-12-22 23:58:35,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-12-22 23:58:35,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-12-22 23:58:35,767 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 41 [2020-12-22 23:58:35,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:35,767 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-12-22 23:58:35,767 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-12-22 23:58:35,767 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-12-22 23:58:35,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-12-22 23:58:35,768 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:35,768 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:35,982 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-12-22 23:58:35,983 INFO L429 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:35,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:35,984 INFO L82 PathProgramCache]: Analyzing trace with hash 1197394614, now seen corresponding path program 17 times [2020-12-22 23:58:35,984 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:35,985 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [702372538] [2020-12-22 23:58:35,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:36,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:36,241 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-22 23:58:36,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [702372538] [2020-12-22 23:58:36,241 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2028604888] [2020-12-22 23:58:36,241 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 [2020-12-22 23:58:43,420 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2020-12-22 23:58:43,421 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:43,436 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 19 conjunts are in the unsatisfiable core [2020-12-22 23:58:43,438 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:43,553 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2020-12-22 23:58:43,554 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:43,554 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 21 [2020-12-22 23:58:43,554 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737853505] [2020-12-22 23:58:43,554 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-12-22 23:58:43,554 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:43,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-12-22 23:58:43,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-22 23:58:43,556 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 21 states. [2020-12-22 23:58:43,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:43,653 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-12-22 23:58:43,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-12-22 23:58:43,653 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-12-22 23:58:43,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:43,654 INFO L225 Difference]: With dead ends: 74 [2020-12-22 23:58:43,654 INFO L226 Difference]: Without dead ends: 48 [2020-12-22 23:58:43,659 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=210, Unknown=0, NotChecked=0, Total=420 [2020-12-22 23:58:43,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-12-22 23:58:43,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-12-22 23:58:43,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-12-22 23:58:43,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-12-22 23:58:43,677 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 43 [2020-12-22 23:58:43,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:43,678 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-12-22 23:58:43,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-12-22 23:58:43,678 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-12-22 23:58:43,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-22 23:58:43,679 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:43,679 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:43,879 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-12-22 23:58:43,880 INFO L429 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:43,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:43,881 INFO L82 PathProgramCache]: Analyzing trace with hash 1535673495, now seen corresponding path program 18 times [2020-12-22 23:58:43,881 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:43,882 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [63736905] [2020-12-22 23:58:43,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:43,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:44,196 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-22 23:58:44,196 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [63736905] [2020-12-22 23:58:44,197 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966454400] [2020-12-22 23:58:44,197 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 [2020-12-22 23:58:47,475 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2020-12-22 23:58:47,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:47,486 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-22 23:58:47,487 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:47,556 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2020-12-22 23:58:47,556 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:47,556 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 22 [2020-12-22 23:58:47,557 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263288495] [2020-12-22 23:58:47,557 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-12-22 23:58:47,557 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:47,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-12-22 23:58:47,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=231, Unknown=0, NotChecked=0, Total=462 [2020-12-22 23:58:47,558 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 22 states. [2020-12-22 23:58:47,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:47,617 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2020-12-22 23:58:47,617 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-12-22 23:58:47,617 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 45 [2020-12-22 23:58:47,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:47,618 INFO L225 Difference]: With dead ends: 77 [2020-12-22 23:58:47,618 INFO L226 Difference]: Without dead ends: 50 [2020-12-22 23:58:47,619 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 [2020-12-22 23:58:47,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-12-22 23:58:47,622 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-12-22 23:58:47,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-12-22 23:58:47,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-12-22 23:58:47,622 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 45 [2020-12-22 23:58:47,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:47,623 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-12-22 23:58:47,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-12-22 23:58:47,623 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-12-22 23:58:47,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-12-22 23:58:47,624 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:47,624 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:47,837 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:47,838 INFO L429 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:47,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:47,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1082134122, now seen corresponding path program 19 times [2020-12-22 23:58:47,839 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:47,839 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [695293640] [2020-12-22 23:58:47,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:47,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:48,151 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-22 23:58:48,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [695293640] [2020-12-22 23:58:48,152 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2042438255] [2020-12-22 23:58:48,152 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 [2020-12-22 23:58:48,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:48,219 INFO L263 TraceCheckSpWp]: Trace formula consists of 203 conjuncts, 21 conjunts are in the unsatisfiable core [2020-12-22 23:58:48,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:48,288 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2020-12-22 23:58:48,289 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:48,289 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 23 [2020-12-22 23:58:48,289 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324911277] [2020-12-22 23:58:48,290 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-12-22 23:58:48,290 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:48,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-12-22 23:58:48,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=253, Unknown=0, NotChecked=0, Total=506 [2020-12-22 23:58:48,291 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 23 states. [2020-12-22 23:58:48,380 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:48,380 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2020-12-22 23:58:48,380 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-12-22 23:58:48,380 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 47 [2020-12-22 23:58:48,381 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:48,381 INFO L225 Difference]: With dead ends: 80 [2020-12-22 23:58:48,381 INFO L226 Difference]: Without dead ends: 52 [2020-12-22 23:58:48,382 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 [2020-12-22 23:58:48,382 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-12-22 23:58:48,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-12-22 23:58:48,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-12-22 23:58:48,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-12-22 23:58:48,386 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 47 [2020-12-22 23:58:48,386 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:48,386 INFO L481 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-12-22 23:58:48,387 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-12-22 23:58:48,387 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-12-22 23:58:48,387 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-12-22 23:58:48,387 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:48,387 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:48,600 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:58:48,601 INFO L429 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:48,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:48,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1164943561, now seen corresponding path program 20 times [2020-12-22 23:58:48,602 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:48,602 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [375223431] [2020-12-22 23:58:48,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:48,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:48,955 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-22 23:58:48,955 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [375223431] [2020-12-22 23:58:48,956 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1799180127] [2020-12-22 23:58:48,956 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 [2020-12-22 23:58:49,049 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 23:58:49,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:58:49,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 22 conjunts are in the unsatisfiable core [2020-12-22 23:58:49,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:58:49,136 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2020-12-22 23:58:49,136 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:58:49,136 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 24 [2020-12-22 23:58:49,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820898418] [2020-12-22 23:58:49,139 INFO L461 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-12-22 23:58:49,140 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:58:49,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-12-22 23:58:49,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2020-12-22 23:58:49,141 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 24 states. [2020-12-22 23:58:49,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:58:49,226 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2020-12-22 23:58:49,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-12-22 23:58:49,226 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 49 [2020-12-22 23:58:49,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:58:49,228 INFO L225 Difference]: With dead ends: 83 [2020-12-22 23:58:49,228 INFO L226 Difference]: Without dead ends: 54 [2020-12-22 23:58:49,230 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 [2020-12-22 23:58:49,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-12-22 23:58:49,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-12-22 23:58:49,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-12-22 23:58:49,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-12-22 23:58:49,235 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 49 [2020-12-22 23:58:49,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:58:49,237 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-12-22 23:58:49,237 INFO L482 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-12-22 23:58:49,237 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-12-22 23:58:49,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-12-22 23:58:49,238 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:58:49,238 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:58:49,453 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2020-12-22 23:58:49,454 INFO L429 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:58:49,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:58:49,455 INFO L82 PathProgramCache]: Analyzing trace with hash 1677996150, now seen corresponding path program 21 times [2020-12-22 23:58:49,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:58:49,456 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1248076445] [2020-12-22 23:58:49,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:58:49,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:58:49,814 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-22 23:58:49,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1248076445] [2020-12-22 23:58:49,815 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [454050170] [2020-12-22 23:58:49,815 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 [2020-12-22 23:59:01,322 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2020-12-22 23:59:01,323 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:59:01,338 INFO L263 TraceCheckSpWp]: Trace formula consists of 219 conjuncts, 23 conjunts are in the unsatisfiable core [2020-12-22 23:59:01,339 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:59:01,424 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2020-12-22 23:59:01,425 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:59:01,425 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 25 [2020-12-22 23:59:01,425 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414187917] [2020-12-22 23:59:01,426 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-12-22 23:59:01,426 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:59:01,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-12-22 23:59:01,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=300, Invalid=300, Unknown=0, NotChecked=0, Total=600 [2020-12-22 23:59:01,427 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 25 states. [2020-12-22 23:59:01,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:59:01,523 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-12-22 23:59:01,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-12-22 23:59:01,524 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2020-12-22 23:59:01,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:59:01,525 INFO L225 Difference]: With dead ends: 86 [2020-12-22 23:59:01,525 INFO L226 Difference]: Without dead ends: 56 [2020-12-22 23:59:01,526 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 [2020-12-22 23:59:01,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-12-22 23:59:01,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-12-22 23:59:01,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-12-22 23:59:01,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-12-22 23:59:01,533 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2020-12-22 23:59:01,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:59:01,533 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-12-22 23:59:01,533 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-12-22 23:59:01,533 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-12-22 23:59:01,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-12-22 23:59:01,534 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:59:01,535 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:59:01,741 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2020-12-22 23:59:01,742 INFO L429 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:59:01,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:59:01,743 INFO L82 PathProgramCache]: Analyzing trace with hash 1745445335, now seen corresponding path program 22 times [2020-12-22 23:59:01,743 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:59:01,747 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143296642] [2020-12-22 23:59:01,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:59:01,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:59:02,150 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-22 23:59:02,151 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143296642] [2020-12-22 23:59:02,151 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1504725992] [2020-12-22 23:59:02,151 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 [2020-12-22 23:59:02,230 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-22 23:59:02,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 23:59:02,232 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 24 conjunts are in the unsatisfiable core [2020-12-22 23:59:02,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 23:59:02,309 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2020-12-22 23:59:02,309 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 23:59:02,310 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 26 [2020-12-22 23:59:02,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113256553] [2020-12-22 23:59:02,310 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-12-22 23:59:02,310 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 23:59:02,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-12-22 23:59:02,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2020-12-22 23:59:02,312 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 26 states. [2020-12-22 23:59:02,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 23:59:02,402 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2020-12-22 23:59:02,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-12-22 23:59:02,402 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 53 [2020-12-22 23:59:02,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 23:59:02,403 INFO L225 Difference]: With dead ends: 89 [2020-12-22 23:59:02,403 INFO L226 Difference]: Without dead ends: 58 [2020-12-22 23:59:02,404 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 [2020-12-22 23:59:02,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-12-22 23:59:02,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-12-22 23:59:02,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-12-22 23:59:02,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-12-22 23:59:02,407 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2020-12-22 23:59:02,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 23:59:02,407 INFO L481 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-12-22 23:59:02,407 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-12-22 23:59:02,407 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-12-22 23:59:02,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-12-22 23:59:02,408 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 23:59:02,408 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 23:59:02,623 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 23:59:02,624 INFO L429 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 23:59:02,624 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 23:59:02,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1621260458, now seen corresponding path program 23 times [2020-12-22 23:59:02,625 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 23:59:02,625 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1729838786] [2020-12-22 23:59:02,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 23:59:02,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 23:59:03,091 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-12-22 23:59:03,091 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1729838786] [2020-12-22 23:59:03,092 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226228449] [2020-12-22 23:59:03,092 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 [2020-12-23 00:00:36,270 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 13 check-sat command(s) [2020-12-23 00:00:36,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:00:36,381 INFO L263 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-23 00:00:36,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:00:36,461 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2020-12-23 00:00:36,462 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:00:36,462 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 27 [2020-12-23 00:00:36,462 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835864503] [2020-12-23 00:00:36,463 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-12-23 00:00:36,463 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:00:36,463 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-12-23 00:00:36,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:00:36,464 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 27 states. [2020-12-23 00:00:36,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:00:36,563 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2020-12-23 00:00:36,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-12-23 00:00:36,563 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 55 [2020-12-23 00:00:36,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:00:36,564 INFO L225 Difference]: With dead ends: 92 [2020-12-23 00:00:36,564 INFO L226 Difference]: Without dead ends: 60 [2020-12-23 00:00:36,565 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=351, Invalid=351, Unknown=0, NotChecked=0, Total=702 [2020-12-23 00:00:36,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-12-23 00:00:36,567 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-12-23 00:00:36,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-12-23 00:00:36,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-12-23 00:00:36,568 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 55 [2020-12-23 00:00:36,568 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:00:36,568 INFO L481 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-12-23 00:00:36,568 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-12-23 00:00:36,568 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-12-23 00:00:36,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-12-23 00:00:36,569 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:00:36,569 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:00:36,784 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2020-12-23 00:00:36,785 INFO L429 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:00:36,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:00:36,786 INFO L82 PathProgramCache]: Analyzing trace with hash 757173367, now seen corresponding path program 24 times [2020-12-23 00:00:36,786 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:00:36,787 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801256067] [2020-12-23 00:00:36,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:00:36,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:00:37,292 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-23 00:00:37,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801256067] [2020-12-23 00:00:37,293 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2006233855] [2020-12-23 00:00:37,293 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 [2020-12-23 00:00:48,790 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2020-12-23 00:00:48,791 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:00:48,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 243 conjuncts, 26 conjunts are in the unsatisfiable core [2020-12-23 00:00:48,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:00:48,889 INFO L134 CoverageAnalysis]: Checked inductivity of 600 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2020-12-23 00:00:48,893 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:00:48,894 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 28 [2020-12-23 00:00:48,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030391916] [2020-12-23 00:00:48,898 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-12-23 00:00:48,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:00:48,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-12-23 00:00:48,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2020-12-23 00:00:48,899 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 28 states. [2020-12-23 00:00:49,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:00:49,006 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2020-12-23 00:00:49,007 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-12-23 00:00:49,007 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 57 [2020-12-23 00:00:49,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:00:49,007 INFO L225 Difference]: With dead ends: 95 [2020-12-23 00:00:49,007 INFO L226 Difference]: Without dead ends: 62 [2020-12-23 00:00:49,008 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 [2020-12-23 00:00:49,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-12-23 00:00:49,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-12-23 00:00:49,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-12-23 00:00:49,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-12-23 00:00:49,011 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 57 [2020-12-23 00:00:49,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:00:49,011 INFO L481 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-12-23 00:00:49,011 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-12-23 00:00:49,011 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-12-23 00:00:49,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-12-23 00:00:49,012 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:00:49,012 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:00:49,226 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-23 00:00:49,227 INFO L429 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:00:49,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:00:49,228 INFO L82 PathProgramCache]: Analyzing trace with hash -612501962, now seen corresponding path program 25 times [2020-12-23 00:00:49,228 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:00:49,228 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [462630338] [2020-12-23 00:00:49,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:00:49,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:00:49,711 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-12-23 00:00:49,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [462630338] [2020-12-23 00:00:49,712 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637620738] [2020-12-23 00:00:49,712 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 [2020-12-23 00:00:49,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:00:49,798 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-23 00:00:49,800 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:00:49,876 INFO L134 CoverageAnalysis]: Checked inductivity of 650 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-12-23 00:00:49,876 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:00:49,876 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 29 [2020-12-23 00:00:49,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12368798] [2020-12-23 00:00:49,877 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-12-23 00:00:49,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:00:49,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-12-23 00:00:49,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=406, Unknown=0, NotChecked=0, Total=812 [2020-12-23 00:00:49,878 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 29 states. [2020-12-23 00:00:49,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:00:49,997 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-12-23 00:00:49,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-12-23 00:00:49,998 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 59 [2020-12-23 00:00:49,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:00:49,998 INFO L225 Difference]: With dead ends: 98 [2020-12-23 00:00:49,999 INFO L226 Difference]: Without dead ends: 64 [2020-12-23 00:00:49,999 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 [2020-12-23 00:00:49,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-12-23 00:00:50,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-12-23 00:00:50,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-12-23 00:00:50,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-12-23 00:00:50,002 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2020-12-23 00:00:50,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:00:50,003 INFO L481 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-12-23 00:00:50,003 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-12-23 00:00:50,003 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-12-23 00:00:50,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-12-23 00:00:50,003 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:00:50,004 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:00:50,213 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2020-12-23 00:00:50,214 INFO L429 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:00:50,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:00:50,214 INFO L82 PathProgramCache]: Analyzing trace with hash 327606039, now seen corresponding path program 26 times [2020-12-23 00:00:50,215 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:00:50,215 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [960096954] [2020-12-23 00:00:50,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:00:50,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:00:50,732 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-12-23 00:00:50,733 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [960096954] [2020-12-23 00:00:50,733 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [471923198] [2020-12-23 00:00:50,733 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 [2020-12-23 00:00:50,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-23 00:00:50,818 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:00:50,820 INFO L263 TraceCheckSpWp]: Trace formula consists of 259 conjuncts, 28 conjunts are in the unsatisfiable core [2020-12-23 00:00:50,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:00:50,897 INFO L134 CoverageAnalysis]: Checked inductivity of 702 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-12-23 00:00:50,897 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:00:50,897 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 30 [2020-12-23 00:00:50,898 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1906365733] [2020-12-23 00:00:50,898 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-12-23 00:00:50,898 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:00:50,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-12-23 00:00:50,899 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-23 00:00:50,899 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 30 states. [2020-12-23 00:00:51,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:00:51,022 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2020-12-23 00:00:51,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-12-23 00:00:51,023 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 61 [2020-12-23 00:00:51,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:00:51,023 INFO L225 Difference]: With dead ends: 101 [2020-12-23 00:00:51,023 INFO L226 Difference]: Without dead ends: 66 [2020-12-23 00:00:51,024 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2020-12-23 00:00:51,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-12-23 00:00:51,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-12-23 00:00:51,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-12-23 00:00:51,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-12-23 00:00:51,026 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 61 [2020-12-23 00:00:51,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:00:51,027 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-12-23 00:00:51,027 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-12-23 00:00:51,027 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-12-23 00:00:51,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-12-23 00:00:51,027 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:00:51,028 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:00:51,242 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2020-12-23 00:00:51,243 INFO L429 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:00:51,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:00:51,243 INFO L82 PathProgramCache]: Analyzing trace with hash -1579713258, now seen corresponding path program 27 times [2020-12-23 00:00:51,244 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:00:51,244 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [349639683] [2020-12-23 00:00:51,244 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:00:51,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:00:51,784 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2020-12-23 00:00:51,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [349639683] [2020-12-23 00:00:51,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1641691640] [2020-12-23 00:00:51,784 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 [2020-12-23 00:01:16,185 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 15 check-sat command(s) [2020-12-23 00:01:16,186 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:01:16,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 50 conjunts are in the unsatisfiable core [2020-12-23 00:01:16,213 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:01:16,354 INFO L134 CoverageAnalysis]: Checked inductivity of 756 backedges. 27 proven. 378 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2020-12-23 00:01:16,354 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:01:16,354 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 31] total 32 [2020-12-23 00:01:16,354 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148720989] [2020-12-23 00:01:16,355 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-23 00:01:16,355 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:01:16,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-23 00:01:16,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-23 00:01:16,356 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 32 states. [2020-12-23 00:01:16,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:01:16,469 INFO L93 Difference]: Finished difference Result 104 states and 109 transitions. [2020-12-23 00:01:16,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-23 00:01:16,470 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 63 [2020-12-23 00:01:16,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:01:16,471 INFO L225 Difference]: With dead ends: 104 [2020-12-23 00:01:16,471 INFO L226 Difference]: Without dead ends: 68 [2020-12-23 00:01:16,472 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-23 00:01:16,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-12-23 00:01:16,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-12-23 00:01:16,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-12-23 00:01:16,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-12-23 00:01:16,475 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 63 [2020-12-23 00:01:16,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:01:16,475 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-12-23 00:01:16,475 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-23 00:01:16,476 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-12-23 00:01:16,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-12-23 00:01:16,476 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:01:16,476 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:01:16,690 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-12-23 00:01:16,691 INFO L429 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:01:16,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:01:16,692 INFO L82 PathProgramCache]: Analyzing trace with hash 1164401079, now seen corresponding path program 28 times [2020-12-23 00:01:16,692 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:01:16,692 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122396478] [2020-12-23 00:01:16,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:01:16,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:01:17,248 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2020-12-23 00:01:17,248 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122396478] [2020-12-23 00:01:17,248 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873346234] [2020-12-23 00:01:17,249 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 [2020-12-23 00:01:17,347 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-23 00:01:17,347 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-23 00:01:17,349 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 30 conjunts are in the unsatisfiable core [2020-12-23 00:01:17,351 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-23 00:01:17,458 INFO L134 CoverageAnalysis]: Checked inductivity of 812 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2020-12-23 00:01:17,459 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-23 00:01:17,459 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31] total 32 [2020-12-23 00:01:17,459 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171005247] [2020-12-23 00:01:17,460 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-12-23 00:01:17,460 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-23 00:01:17,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-12-23 00:01:17,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-23 00:01:17,461 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 32 states. [2020-12-23 00:01:17,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-23 00:01:17,592 INFO L93 Difference]: Finished difference Result 107 states and 112 transitions. [2020-12-23 00:01:17,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-12-23 00:01:17,592 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 65 [2020-12-23 00:01:17,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-23 00:01:17,600 INFO L225 Difference]: With dead ends: 107 [2020-12-23 00:01:17,600 INFO L226 Difference]: Without dead ends: 70 [2020-12-23 00:01:17,603 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2020-12-23 00:01:17,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-12-23 00:01:17,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-12-23 00:01:17,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-12-23 00:01:17,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-12-23 00:01:17,607 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 65 [2020-12-23 00:01:17,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-23 00:01:17,607 INFO L481 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-12-23 00:01:17,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-12-23 00:01:17,607 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-12-23 00:01:17,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-12-23 00:01:17,608 INFO L414 BasicCegarLoop]: Found error trace [2020-12-23 00:01:17,608 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-23 00:01:17,816 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2020-12-23 00:01:17,817 INFO L429 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-23 00:01:17,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-23 00:01:17,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1151591434, now seen corresponding path program 29 times [2020-12-23 00:01:17,818 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-23 00:01:17,818 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316056392] [2020-12-23 00:01:17,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-23 00:01:17,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-23 00:01:18,387 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2020-12-23 00:01:18,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316056392] [2020-12-23 00:01:18,388 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1065558246] [2020-12-23 00:01:18,388 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