/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_15x0-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 20:33:36,601 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:33:36,604 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:33:36,650 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:33:36,650 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:33:36,660 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:33:36,663 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:33:36,667 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:33:36,670 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:33:36,674 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:33:36,675 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:33:36,676 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:33:36,676 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:33:36,679 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:33:36,682 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:33:36,683 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:33:36,685 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:33:36,686 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:33:36,688 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:33:36,698 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:33:36,701 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:33:36,703 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:33:36,704 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:33:36,704 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:33:36,718 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:33:36,732 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:33:36,732 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:33:36,734 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:33:36,735 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 20:33:36,779 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:33:36,779 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:33:36,782 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:33:36,782 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:33:36,782 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:33:36,782 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:33:36,783 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:33:36,783 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:33:36,783 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:33:36,783 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:33:36,785 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:33:36,785 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:33:36,785 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:33:36,786 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:33:36,786 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:33:36,786 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:33:36,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:33:36,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:33:36,787 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:33:36,787 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:33:36,787 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:33:36,787 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:33:36,788 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:33:36,788 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:33:36,788 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:33:36,788 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:33:36,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:33:36,789 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:33:36,789 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:33:36,789 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:33:37,106 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:33:37,128 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:33:37,134 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:33:37,136 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:33:37,137 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:33:37,137 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-08-21 20:33:37,218 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/968cbc8e3/1005596daff7461199ffca542af99bc6/FLAGe96a2c15f [2020-08-21 20:33:37,687 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:33:37,688 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_15x0-2.c [2020-08-21 20:33:37,694 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/968cbc8e3/1005596daff7461199ffca542af99bc6/FLAGe96a2c15f [2020-08-21 20:33:38,121 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/968cbc8e3/1005596daff7461199ffca542af99bc6 [2020-08-21 20:33:38,132 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:33:38,134 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:33:38,135 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:33:38,136 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:33:38,140 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:33:38,141 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,144 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ebaa4b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38, skipping insertion in model container [2020-08-21 20:33:38,145 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,153 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:33:38,173 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:33:38,334 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:33:38,339 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:33:38,356 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:33:38,371 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:33:38,372 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38 WrapperNode [2020-08-21 20:33:38,372 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:33:38,373 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:33:38,373 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:33:38,374 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:33:38,389 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,389 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,395 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,395 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,399 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,401 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,402 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... [2020-08-21 20:33:38,404 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:33:38,405 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:33:38,405 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:33:38,405 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:33:38,406 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 20:33:38,551 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:33:38,552 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:33:38,552 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-21 20:33:38,552 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:33:38,552 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:33:38,552 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-21 20:33:38,553 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:33:38,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:33:38,553 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:33:38,730 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:33:38,730 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 20:33:38,737 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:33:38 BoogieIcfgContainer [2020-08-21 20:33:38,737 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:33:38,739 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:33:38,739 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:33:38,751 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:33:38,752 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:33:38" (1/3) ... [2020-08-21 20:33:38,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@643ee4b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:33:38, skipping insertion in model container [2020-08-21 20:33:38,753 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:33:38" (2/3) ... [2020-08-21 20:33:38,753 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@643ee4b9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:33:38, skipping insertion in model container [2020-08-21 20:33:38,754 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:33:38" (3/3) ... [2020-08-21 20:33:38,755 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_15x0-2.c [2020-08-21 20:33:38,780 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:33:38,794 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:33:38,823 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:33:38,882 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:33:38,882 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:33:38,882 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:33:38,883 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:33:38,883 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:33:38,883 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:33:38,883 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:33:38,883 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:33:38,926 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 20:33:38,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 20:33:38,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:38,935 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:38,936 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:38,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:38,941 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-21 20:33:38,948 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:38,949 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1133953300] [2020-08-21 20:33:38,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:39,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,117 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:39,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:39,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,168 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:33:39,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1133953300] [2020-08-21 20:33:39,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:33:39,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 20:33:39,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212377103] [2020-08-21 20:33:39,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:33:39,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:39,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:33:39,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:33:39,194 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 20:33:39,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:39,302 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-21 20:33:39,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:33:39,304 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 20:33:39,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:39,313 INFO L225 Difference]: With dead ends: 30 [2020-08-21 20:33:39,313 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 20:33:39,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:33:39,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 20:33:39,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 20:33:39,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 20:33:39,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 20:33:39,359 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 20:33:39,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:39,359 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 20:33:39,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:33:39,360 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 20:33:39,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 20:33:39,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:39,362 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:39,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:33:39,363 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:39,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:39,364 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-21 20:33:39,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:39,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074943749] [2020-08-21 20:33:39,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:39,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:39,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:39,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,488 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 20:33:39,489 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074943749] [2020-08-21 20:33:39,489 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:39,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:33:39,490 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432919003] [2020-08-21 20:33:39,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:33:39,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:39,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:33:39,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:33:39,493 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-21 20:33:39,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:39,562 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 20:33:39,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:33:39,563 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 20:33:39,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:39,564 INFO L225 Difference]: With dead ends: 25 [2020-08-21 20:33:39,564 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 20:33:39,566 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:33:39,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 20:33:39,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 20:33:39,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 20:33:39,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 20:33:39,574 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 20:33:39,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:39,574 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 20:33:39,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:33:39,575 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 20:33:39,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 20:33:39,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:39,576 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:39,576 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:33:39,577 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:39,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:39,577 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-21 20:33:39,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:39,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1912864103] [2020-08-21 20:33:39,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:39,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:39,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:39,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:39,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,802 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 20:33:39,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1912864103] [2020-08-21 20:33:39,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:39,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:33:39,803 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493153036] [2020-08-21 20:33:39,804 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:33:39,804 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:39,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:33:39,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:33:39,805 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-21 20:33:39,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:39,875 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 20:33:39,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:33:39,876 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 20:33:39,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:39,878 INFO L225 Difference]: With dead ends: 28 [2020-08-21 20:33:39,878 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 20:33:39,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:33:39,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 20:33:39,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 20:33:39,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 20:33:39,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 20:33:39,886 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 20:33:39,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:39,887 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 20:33:39,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:33:39,888 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 20:33:39,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 20:33:39,889 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:39,889 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:39,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:33:39,890 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:39,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:39,890 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-08-21 20:33:39,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:39,891 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1778782303] [2020-08-21 20:33:39,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:39,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:39,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:39,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:39,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,086 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,161 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-21 20:33:40,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1778782303] [2020-08-21 20:33:40,163 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:40,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:33:40,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1340249620] [2020-08-21 20:33:40,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:33:40,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:40,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:33:40,167 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:33:40,167 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-21 20:33:40,285 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:40,285 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-21 20:33:40,286 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:33:40,286 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 20:33:40,287 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:40,287 INFO L225 Difference]: With dead ends: 31 [2020-08-21 20:33:40,288 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 20:33:40,289 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:33:40,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 20:33:40,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 20:33:40,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 20:33:40,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 20:33:40,295 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-21 20:33:40,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:40,296 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 20:33:40,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:33:40,296 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 20:33:40,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 20:33:40,298 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:40,298 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:40,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:33:40,298 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:40,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:40,299 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-08-21 20:33:40,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:40,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [420491005] [2020-08-21 20:33:40,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:40,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:40,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,336 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:40,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,458 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-21 20:33:40,458 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [420491005] [2020-08-21 20:33:40,459 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:40,459 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:33:40,459 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293264981] [2020-08-21 20:33:40,460 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:33:40,460 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:40,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:33:40,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:33:40,461 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-21 20:33:40,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:40,542 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 20:33:40,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:33:40,543 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-21 20:33:40,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:40,545 INFO L225 Difference]: With dead ends: 34 [2020-08-21 20:33:40,545 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 20:33:40,546 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:33:40,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 20:33:40,551 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 20:33:40,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 20:33:40,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-21 20:33:40,553 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-21 20:33:40,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:40,553 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-21 20:33:40,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:33:40,554 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-21 20:33:40,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 20:33:40,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:40,555 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:40,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:33:40,556 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:40,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:40,556 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-08-21 20:33:40,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:40,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115517423] [2020-08-21 20:33:40,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:40,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:40,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,591 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:40,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,730 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-21 20:33:40,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115517423] [2020-08-21 20:33:40,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:40,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:33:40,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [974296094] [2020-08-21 20:33:40,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:33:40,733 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:40,733 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:33:40,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:33:40,733 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-21 20:33:40,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:40,823 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-21 20:33:40,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:33:40,823 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-21 20:33:40,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:40,825 INFO L225 Difference]: With dead ends: 37 [2020-08-21 20:33:40,825 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 20:33:40,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:33:40,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 20:33:40,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 20:33:40,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 20:33:40,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 20:33:40,832 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-21 20:33:40,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:40,833 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 20:33:40,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:33:40,834 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 20:33:40,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 20:33:40,835 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:40,835 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:40,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:33:40,836 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:40,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:40,836 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-08-21 20:33:40,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:40,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050350041] [2020-08-21 20:33:40,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:40,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:40,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:40,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:40,978 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:40,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,059 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-21 20:33:41,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050350041] [2020-08-21 20:33:41,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:41,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:33:41,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364867912] [2020-08-21 20:33:41,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:33:41,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:41,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:33:41,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:33:41,062 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 20:33:41,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:41,175 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-21 20:33:41,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:33:41,176 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-21 20:33:41,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:41,177 INFO L225 Difference]: With dead ends: 40 [2020-08-21 20:33:41,178 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 20:33:41,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:33:41,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 20:33:41,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 20:33:41,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 20:33:41,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-21 20:33:41,185 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-21 20:33:41,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:41,186 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-21 20:33:41,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:33:41,186 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-21 20:33:41,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 20:33:41,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:41,188 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:41,188 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:33:41,188 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:41,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:41,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-08-21 20:33:41,189 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:41,189 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477581357] [2020-08-21 20:33:41,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:41,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:41,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:41,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,437 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-21 20:33:41,438 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477581357] [2020-08-21 20:33:41,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:41,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:33:41,439 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018484808] [2020-08-21 20:33:41,439 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:33:41,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:41,440 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:33:41,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:33:41,441 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-21 20:33:41,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:41,555 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-21 20:33:41,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:33:41,556 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-21 20:33:41,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:41,557 INFO L225 Difference]: With dead ends: 43 [2020-08-21 20:33:41,557 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 20:33:41,558 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:33:41,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 20:33:41,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 20:33:41,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 20:33:41,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 20:33:41,565 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-21 20:33:41,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:41,565 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 20:33:41,565 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:33:41,566 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 20:33:41,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 20:33:41,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:41,567 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:41,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:33:41,567 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:41,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:41,568 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-08-21 20:33:41,568 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:41,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1849954655] [2020-08-21 20:33:41,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:41,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:41,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:41,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:41,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:41,961 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-21 20:33:41,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1849954655] [2020-08-21 20:33:41,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:41,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:33:41,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [700062059] [2020-08-21 20:33:41,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:33:41,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:41,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:33:41,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:33:41,964 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-21 20:33:42,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:42,101 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-21 20:33:42,102 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:33:42,102 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-21 20:33:42,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:42,103 INFO L225 Difference]: With dead ends: 46 [2020-08-21 20:33:42,103 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 20:33:42,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:33:42,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 20:33:42,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 20:33:42,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 20:33:42,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-21 20:33:42,116 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-21 20:33:42,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:42,116 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-21 20:33:42,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:33:42,116 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-21 20:33:42,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 20:33:42,120 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:42,120 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:42,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:33:42,121 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:42,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:42,122 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-08-21 20:33:42,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:42,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156248998] [2020-08-21 20:33:42,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:42,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:42,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:42,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,405 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,500 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-21 20:33:42,501 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156248998] [2020-08-21 20:33:42,501 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:42,501 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:33:42,501 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949374621] [2020-08-21 20:33:42,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:33:42,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:42,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:33:42,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:33:42,503 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-21 20:33:42,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:42,686 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 20:33:42,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:33:42,686 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-21 20:33:42,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:42,688 INFO L225 Difference]: With dead ends: 49 [2020-08-21 20:33:42,688 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 20:33:42,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:33:42,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 20:33:42,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 20:33:42,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 20:33:42,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 20:33:42,695 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-21 20:33:42,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:42,696 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 20:33:42,696 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:33:42,696 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 20:33:42,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 20:33:42,697 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:42,697 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:42,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:33:42,698 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:42,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:42,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-08-21 20:33:42,698 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:42,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962081404] [2020-08-21 20:33:42,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:42,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:42,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:42,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:42,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:42,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,049 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-21 20:33:43,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962081404] [2020-08-21 20:33:43,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:43,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:33:43,050 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [131342744] [2020-08-21 20:33:43,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:33:43,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:43,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:33:43,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:33:43,052 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2020-08-21 20:33:43,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:43,218 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-21 20:33:43,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:33:43,219 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2020-08-21 20:33:43,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:43,220 INFO L225 Difference]: With dead ends: 52 [2020-08-21 20:33:43,220 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 20:33:43,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=236, Invalid=414, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:33:43,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 20:33:43,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 20:33:43,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 20:33:43,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-21 20:33:43,228 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-21 20:33:43,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:43,229 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-21 20:33:43,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:33:43,229 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-21 20:33:43,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 20:33:43,231 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:43,231 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:43,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:33:43,231 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:43,232 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:43,232 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2020-08-21 20:33:43,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:43,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123838349] [2020-08-21 20:33:43,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:43,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:43,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:43,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,598 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:43,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:43,768 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-21 20:33:43,769 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123838349] [2020-08-21 20:33:43,769 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:43,769 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:33:43,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577398862] [2020-08-21 20:33:43,770 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:33:43,770 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:43,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:33:43,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:33:43,771 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-08-21 20:33:44,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:44,019 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-21 20:33:44,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:33:44,020 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-08-21 20:33:44,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:44,021 INFO L225 Difference]: With dead ends: 55 [2020-08-21 20:33:44,021 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 20:33:44,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:33:44,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 20:33:44,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 20:33:44,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 20:33:44,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 20:33:44,037 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-21 20:33:44,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:44,040 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 20:33:44,040 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:33:44,040 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 20:33:44,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 20:33:44,042 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:44,042 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:44,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:33:44,043 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:44,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:44,044 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2020-08-21 20:33:44,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:44,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932360265] [2020-08-21 20:33:44,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:44,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:44,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:44,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,365 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:44,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,641 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-21 20:33:44,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932360265] [2020-08-21 20:33:44,642 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:44,642 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:33:44,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262721349] [2020-08-21 20:33:44,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:33:44,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:44,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:33:44,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:33:44,645 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2020-08-21 20:33:44,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:44,841 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-21 20:33:44,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:33:44,842 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2020-08-21 20:33:44,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:44,844 INFO L225 Difference]: With dead ends: 58 [2020-08-21 20:33:44,844 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 20:33:44,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2020-08-21 20:33:44,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 20:33:44,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 20:33:44,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 20:33:44,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-21 20:33:44,858 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-21 20:33:44,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:44,858 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-21 20:33:44,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:33:44,858 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-21 20:33:44,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 20:33:44,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:44,860 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:44,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:33:44,861 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:44,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:44,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2020-08-21 20:33:44,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:44,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1530180544] [2020-08-21 20:33:44,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:44,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:44,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:44,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:44,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,467 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,588 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-21 20:33:45,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1530180544] [2020-08-21 20:33:45,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:45,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:33:45,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194392002] [2020-08-21 20:33:45,590 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:33:45,590 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:45,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:33:45,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:33:45,591 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2020-08-21 20:33:45,792 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:45,793 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-21 20:33:45,793 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:33:45,793 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2020-08-21 20:33:45,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:45,795 INFO L225 Difference]: With dead ends: 61 [2020-08-21 20:33:45,795 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 20:33:45,796 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=362, Invalid=630, Unknown=0, NotChecked=0, Total=992 [2020-08-21 20:33:45,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 20:33:45,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 20:33:45,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 20:33:45,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 20:33:45,810 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-21 20:33:45,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:45,811 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 20:33:45,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:33:45,811 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 20:33:45,815 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 20:33:45,815 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:45,815 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:45,815 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:33:45,816 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:45,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:45,816 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2020-08-21 20:33:45,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:45,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130277637] [2020-08-21 20:33:45,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:45,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:33:45,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 20:33:45,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:45,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:45,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,260 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,402 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 20:33:46,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:33:46,502 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-21 20:33:46,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130277637] [2020-08-21 20:33:46,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:33:46,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:33:46,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515641052] [2020-08-21 20:33:46,503 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:33:46,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:33:46,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:33:46,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:33:46,505 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2020-08-21 20:33:46,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:33:46,716 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-21 20:33:46,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:33:46,717 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-21 20:33:46,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:33:46,718 INFO L225 Difference]: With dead ends: 64 [2020-08-21 20:33:46,718 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 20:33:46,719 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 20:33:46,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 20:33:46,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 20:33:46,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 20:33:46,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-21 20:33:46,725 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-21 20:33:46,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:33:46,725 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-21 20:33:46,725 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:33:46,726 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-21 20:33:46,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 20:33:46,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:33:46,727 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:33:46,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 20:33:46,727 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:33:46,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:33:46,728 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2020-08-21 20:33:46,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:33:46,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1420286521] [2020-08-21 20:33:46,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:33:46,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 20:33:46,757 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 20:33:46,757 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 20:33:46,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 20:33:46,785 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 08:33:46 BoogieIcfgContainer [2020-08-21 20:33:46,786 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 20:33:46,788 INFO L168 Benchmark]: Toolchain (without parser) took 8653.85 ms. Allocated memory was 139.5 MB in the beginning and 359.7 MB in the end (delta: 220.2 MB). Free memory was 102.5 MB in the beginning and 131.8 MB in the end (delta: -29.3 MB). Peak memory consumption was 190.9 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:46,789 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 20:33:46,789 INFO L168 Benchmark]: CACSL2BoogieTranslator took 237.53 ms. Allocated memory is still 139.5 MB. Free memory was 102.3 MB in the beginning and 93.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:46,790 INFO L168 Benchmark]: Boogie Preprocessor took 30.95 ms. Allocated memory is still 139.5 MB. Free memory was 93.0 MB in the beginning and 91.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:46,791 INFO L168 Benchmark]: RCFGBuilder took 332.87 ms. Allocated memory was 139.5 MB in the beginning and 201.3 MB in the end (delta: 61.9 MB). Free memory was 91.6 MB in the beginning and 169.2 MB in the end (delta: -77.5 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:46,792 INFO L168 Benchmark]: TraceAbstraction took 8047.11 ms. Allocated memory was 201.3 MB in the beginning and 359.7 MB in the end (delta: 158.3 MB). Free memory was 169.2 MB in the beginning and 131.8 MB in the end (delta: 37.4 MB). Peak memory consumption was 195.7 MB. Max. memory is 7.1 GB. [2020-08-21 20:33:46,795 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 139.5 MB. Free memory was 121.0 MB in the beginning and 120.8 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 237.53 ms. Allocated memory is still 139.5 MB. Free memory was 102.3 MB in the beginning and 93.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 30.95 ms. Allocated memory is still 139.5 MB. Free memory was 93.0 MB in the beginning and 91.6 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 332.87 ms. Allocated memory was 139.5 MB in the beginning and 201.3 MB in the end (delta: 61.9 MB). Free memory was 91.6 MB in the beginning and 169.2 MB in the end (delta: -77.5 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8047.11 ms. Allocated memory was 201.3 MB in the beginning and 359.7 MB in the end (delta: 158.3 MB). Free memory was 169.2 MB in the beginning and 131.8 MB in the end (delta: 37.4 MB). Peak memory consumption was 195.7 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 15; [L13] int b = 0; [L14] CALL, EXPR sum(a, b) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND TRUE n <= 0 [L5] return m + n; [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) [L14] int result = sum(a, b); [L15] COND TRUE result == a + b [L16] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7.8s, OverallIterations: 16, TraceHistogramMax: 16, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 183 SDtfs, 318 SDslu, 711 SDs, 0 SdLazy, 522 SolverSat, 33 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 555 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1015 ImplicationChecksByTransitivity, 2.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.8s InterpolantComputationTime, 928 NumberOfCodeBlocks, 928 NumberOfCodeBlocksAsserted, 16 NumberOfCheckSat, 810 ConstructedInterpolants, 0 QuantifiedInterpolants, 133800 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 15 InterpolantComputations, 1 PerfectInterpolantSequences, 1575/3150 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...