/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.4 --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/id_i15_o15-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 23:47:12,622 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 23:47:12,625 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 23:47:12,666 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 23:47:12,667 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 23:47:12,675 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 23:47:12,677 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 23:47:12,681 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 23:47:12,683 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 23:47:12,686 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 23:47:12,687 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 23:47:12,688 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 23:47:12,688 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 23:47:12,691 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 23:47:12,693 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 23:47:12,694 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 23:47:12,696 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 23:47:12,697 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 23:47:12,698 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 23:47:12,706 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 23:47:12,709 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 23:47:12,710 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 23:47:12,711 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 23:47:12,711 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 23:47:12,723 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 23:47:12,724 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 23:47:12,729 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 23:47:12,730 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 23:47:12,730 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 23:47:12,731 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 23:47:12,742 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 23:47:12,743 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 23:47:12,743 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 23:47:12,744 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 23:47:12,781 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 23:47:12,782 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 23:47:12,784 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 23:47:12,784 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 23:47:12,784 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 23:47:12,785 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 23:47:12,785 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 23:47:12,785 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 23:47:12,785 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 23:47:12,786 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 23:47:12,787 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 23:47:12,787 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 23:47:12,787 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 23:47:12,788 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 23:47:12,788 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 23:47:12,788 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 23:47:12,788 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 23:47:12,788 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 23:47:12,788 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 23:47:12,789 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 23:47:12,789 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 23:47:12,789 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 23:47:12,789 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 23:47:12,790 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 23:47:12,790 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 23:47:12,790 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 23:47:12,790 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 23:47:12,790 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 23:47:12,791 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 23:47:12,791 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=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.4;log-additional-information=true; [2020-08-21 23:47:13,064 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 23:47:13,076 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 23:47:13,079 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 23:47:13,081 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 23:47:13,081 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 23:47:13,082 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i15_o15-2.c [2020-08-21 23:47:13,135 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/02f3b4b74/886dc20a13f144feb3c621ae5f1eba86/FLAG32bac8794 [2020-08-21 23:47:13,561 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 23:47:13,562 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_i15_o15-2.c [2020-08-21 23:47:13,567 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/02f3b4b74/886dc20a13f144feb3c621ae5f1eba86/FLAG32bac8794 [2020-08-21 23:47:13,965 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/02f3b4b74/886dc20a13f144feb3c621ae5f1eba86 [2020-08-21 23:47:13,973 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 23:47:13,974 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 23:47:13,975 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 23:47:13,976 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 23:47:13,979 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 23:47:13,980 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:47:13" (1/1) ... [2020-08-21 23:47:13,983 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@26da8024 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:13, skipping insertion in model container [2020-08-21 23:47:13,984 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 11:47:13" (1/1) ... [2020-08-21 23:47:13,991 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 23:47:14,009 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 23:47:14,207 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:47:14,212 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 23:47:14,230 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 23:47:14,245 INFO L208 MainTranslator]: Completed translation [2020-08-21 23:47:14,246 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14 WrapperNode [2020-08-21 23:47:14,246 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 23:47:14,246 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 23:47:14,247 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 23:47:14,247 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 23:47:14,261 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (1/1) ... [2020-08-21 23:47:14,262 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (1/1) ... [2020-08-21 23:47:14,267 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (1/1) ... [2020-08-21 23:47:14,268 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (1/1) ... [2020-08-21 23:47:14,271 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (1/1) ... [2020-08-21 23:47:14,274 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (1/1) ... [2020-08-21 23:47:14,275 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (1/1) ... [2020-08-21 23:47:14,276 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 23:47:14,277 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 23:47:14,277 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 23:47:14,277 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 23:47:14,278 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (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 23:47:14,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 23:47:14,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 23:47:14,485 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-21 23:47:14,485 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 23:47:14,485 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 23:47:14,486 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 23:47:14,486 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-21 23:47:14,486 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 23:47:14,486 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 23:47:14,486 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 23:47:14,661 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 23:47:14,661 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 23:47:14,665 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:47:14 BoogieIcfgContainer [2020-08-21 23:47:14,665 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 23:47:14,667 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 23:47:14,667 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 23:47:14,670 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 23:47:14,670 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 11:47:13" (1/3) ... [2020-08-21 23:47:14,671 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28920012 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:47:14, skipping insertion in model container [2020-08-21 23:47:14,671 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 11:47:14" (2/3) ... [2020-08-21 23:47:14,672 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28920012 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 11:47:14, skipping insertion in model container [2020-08-21 23:47:14,672 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 11:47:14" (3/3) ... [2020-08-21 23:47:14,674 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2020-08-21 23:47:14,684 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 23:47:14,692 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 23:47:14,706 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 23:47:14,731 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 23:47:14,731 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 23:47:14,731 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 23:47:14,731 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 23:47:14,731 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 23:47:14,732 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 23:47:14,732 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 23:47:14,732 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 23:47:14,747 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 23:47:14,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 23:47:14,753 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:14,754 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 23:47:14,755 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:14,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:14,761 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-21 23:47:14,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:14,771 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [456467847] [2020-08-21 23:47:14,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:14,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:14,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:14,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:14,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:14,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:14,992 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 23:47:14,994 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [456467847] [2020-08-21 23:47:14,997 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 23:47:14,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 23:47:14,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [29237158] [2020-08-21 23:47:15,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 23:47:15,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:15,023 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 23:47:15,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 23:47:15,027 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 23:47:15,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:15,136 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-21 23:47:15,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 23:47:15,138 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 23:47:15,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:15,148 INFO L225 Difference]: With dead ends: 30 [2020-08-21 23:47:15,149 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 23:47:15,152 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 23:47:15,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 23:47:15,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 23:47:15,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 23:47:15,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 23:47:15,191 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 23:47:15,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:15,192 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 23:47:15,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 23:47:15,192 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 23:47:15,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 23:47:15,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:15,194 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 23:47:15,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 23:47:15,195 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:15,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:15,196 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-21 23:47:15,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:15,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1870061207] [2020-08-21 23:47:15,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:15,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:15,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:15,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:15,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,333 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 23:47:15,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1870061207] [2020-08-21 23:47:15,335 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:15,335 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 23:47:15,335 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1398290878] [2020-08-21 23:47:15,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 23:47:15,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:15,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 23:47:15,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 23:47:15,339 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-21 23:47:15,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:15,411 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 23:47:15,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 23:47:15,412 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 23:47:15,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:15,414 INFO L225 Difference]: With dead ends: 25 [2020-08-21 23:47:15,414 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 23:47:15,415 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 23:47:15,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 23:47:15,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 23:47:15,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 23:47:15,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 23:47:15,423 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 23:47:15,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:15,423 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 23:47:15,423 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 23:47:15,424 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 23:47:15,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 23:47:15,425 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:15,425 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 23:47:15,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 23:47:15,426 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:15,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:15,426 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-21 23:47:15,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:15,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [966071167] [2020-08-21 23:47:15,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:15,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:15,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,478 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:15,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:15,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:15,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,582 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 23:47:15,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [966071167] [2020-08-21 23:47:15,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:15,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 23:47:15,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2039347680] [2020-08-21 23:47:15,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 23:47:15,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:15,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 23:47:15,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 23:47:15,585 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-21 23:47:15,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:15,650 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 23:47:15,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 23:47:15,650 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 23:47:15,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:15,652 INFO L225 Difference]: With dead ends: 28 [2020-08-21 23:47:15,652 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 23:47:15,653 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 23:47:15,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 23:47:15,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 23:47:15,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 23:47:15,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 23:47:15,660 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 23:47:15,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:15,661 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 23:47:15,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 23:47:15,661 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 23:47:15,662 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 23:47:15,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:15,663 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 23:47:15,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 23:47:15,663 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:15,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:15,664 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-21 23:47:15,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:15,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258380771] [2020-08-21 23:47:15,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:15,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:15,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:15,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:15,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:15,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:15,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:15,873 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 23:47:15,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258380771] [2020-08-21 23:47:15,874 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:15,874 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 23:47:15,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1787656456] [2020-08-21 23:47:15,875 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 23:47:15,875 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:15,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 23:47:15,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 23:47:15,876 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-21 23:47:15,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:15,994 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-21 23:47:15,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 23:47:15,995 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 23:47:15,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:15,998 INFO L225 Difference]: With dead ends: 31 [2020-08-21 23:47:15,998 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 23:47:15,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:47:16,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 23:47:16,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 23:47:16,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 23:47:16,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 23:47:16,013 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-21 23:47:16,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:16,017 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 23:47:16,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 23:47:16,019 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 23:47:16,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 23:47:16,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:16,021 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 23:47:16,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 23:47:16,022 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:16,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:16,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-08-21 23:47:16,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:16,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730382697] [2020-08-21 23:47:16,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:16,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:16,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,112 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:16,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,286 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,309 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 23:47:16,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730382697] [2020-08-21 23:47:16,310 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:16,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 23:47:16,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059513314] [2020-08-21 23:47:16,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 23:47:16,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:16,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 23:47:16,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 23:47:16,312 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-21 23:47:16,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:16,401 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 23:47:16,402 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 23:47:16,402 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-21 23:47:16,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:16,404 INFO L225 Difference]: With dead ends: 34 [2020-08-21 23:47:16,404 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 23:47:16,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-21 23:47:16,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 23:47:16,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 23:47:16,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 23:47:16,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-21 23:47:16,413 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-21 23:47:16,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:16,413 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-21 23:47:16,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 23:47:16,414 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-21 23:47:16,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 23:47:16,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:16,415 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 23:47:16,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 23:47:16,416 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:16,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:16,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-08-21 23:47:16,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:16,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [92354626] [2020-08-21 23:47:16,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:16,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:16,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:16,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,599 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 23:47:16,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [92354626] [2020-08-21 23:47:16,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:16,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 23:47:16,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [572019853] [2020-08-21 23:47:16,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 23:47:16,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:16,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 23:47:16,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 23:47:16,602 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-21 23:47:16,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:16,699 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-21 23:47:16,700 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 23:47:16,700 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-21 23:47:16,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:16,701 INFO L225 Difference]: With dead ends: 37 [2020-08-21 23:47:16,702 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 23:47:16,703 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 23:47:16,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 23:47:16,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 23:47:16,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 23:47:16,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 23:47:16,709 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-21 23:47:16,710 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:16,710 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 23:47:16,710 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 23:47:16,710 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 23:47:16,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 23:47:16,712 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:16,712 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 23:47:16,712 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 23:47:16,713 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:16,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:16,713 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-08-21 23:47:16,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:16,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238522262] [2020-08-21 23:47:16,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:16,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:16,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:16,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,802 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,910 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:16,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:16,948 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 23:47:16,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238522262] [2020-08-21 23:47:16,949 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:16,949 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 23:47:16,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091245655] [2020-08-21 23:47:16,950 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 23:47:16,950 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:16,950 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 23:47:16,951 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 23:47:16,951 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 23:47:17,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:17,060 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-21 23:47:17,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 23:47:17,061 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-21 23:47:17,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:17,063 INFO L225 Difference]: With dead ends: 40 [2020-08-21 23:47:17,063 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 23:47:17,064 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 23:47:17,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 23:47:17,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 23:47:17,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 23:47:17,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-21 23:47:17,070 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-21 23:47:17,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:17,071 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-21 23:47:17,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 23:47:17,071 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-21 23:47:17,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 23:47:17,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:17,072 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 23:47:17,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 23:47:17,073 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:17,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:17,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-08-21 23:47:17,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:17,074 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [721852348] [2020-08-21 23:47:17,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:17,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:17,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:17,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,306 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 23:47:17,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [721852348] [2020-08-21 23:47:17,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:17,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 23:47:17,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631958045] [2020-08-21 23:47:17,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 23:47:17,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:17,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 23:47:17,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-21 23:47:17,310 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-21 23:47:17,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:17,433 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-21 23:47:17,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 23:47:17,433 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-21 23:47:17,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:17,435 INFO L225 Difference]: With dead ends: 43 [2020-08-21 23:47:17,435 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 23:47:17,436 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 23:47:17,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 23:47:17,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 23:47:17,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 23:47:17,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 23:47:17,443 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-21 23:47:17,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:17,443 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 23:47:17,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 23:47:17,444 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 23:47:17,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 23:47:17,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:17,445 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 23:47:17,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 23:47:17,445 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:17,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:17,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-08-21 23:47:17,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:17,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1773455814] [2020-08-21 23:47:17,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:17,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,474 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:17,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:17,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,729 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 23:47:17,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1773455814] [2020-08-21 23:47:17,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:17,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 23:47:17,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390493382] [2020-08-21 23:47:17,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 23:47:17,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:17,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 23:47:17,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-21 23:47:17,732 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-21 23:47:17,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:17,858 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-21 23:47:17,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 23:47:17,859 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-21 23:47:17,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:17,860 INFO L225 Difference]: With dead ends: 46 [2020-08-21 23:47:17,861 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 23:47:17,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2020-08-21 23:47:17,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 23:47:17,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 23:47:17,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 23:47:17,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-21 23:47:17,868 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-21 23:47:17,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:17,869 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-21 23:47:17,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 23:47:17,869 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-21 23:47:17,870 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 23:47:17,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:17,870 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 23:47:17,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 23:47:17,871 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:17,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:17,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-08-21 23:47:17,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:17,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769556668] [2020-08-21 23:47:17,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:17,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:17,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:17,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:17,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:17,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,167 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 23:47:18,168 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769556668] [2020-08-21 23:47:18,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:18,168 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 23:47:18,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440081067] [2020-08-21 23:47:18,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 23:47:18,169 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:18,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 23:47:18,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-21 23:47:18,170 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-21 23:47:18,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:18,307 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 23:47:18,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 23:47:18,308 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-21 23:47:18,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:18,309 INFO L225 Difference]: With dead ends: 49 [2020-08-21 23:47:18,309 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 23:47:18,310 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2020-08-21 23:47:18,311 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 23:47:18,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 23:47:18,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 23:47:18,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 23:47:18,317 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-21 23:47:18,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:18,317 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 23:47:18,317 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 23:47:18,317 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 23:47:18,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 23:47:18,319 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:18,319 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 23:47:18,319 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 23:47:18,319 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:18,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:18,320 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-08-21 23:47:18,320 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:18,320 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704733707] [2020-08-21 23:47:18,320 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:18,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:18,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:18,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,662 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 23:47:18,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704733707] [2020-08-21 23:47:18,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:18,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 23:47:18,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927581692] [2020-08-21 23:47:18,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 23:47:18,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:18,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 23:47:18,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2020-08-21 23:47:18,665 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2020-08-21 23:47:18,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:18,837 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-21 23:47:18,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 23:47:18,838 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2020-08-21 23:47:18,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:18,840 INFO L225 Difference]: With dead ends: 52 [2020-08-21 23:47:18,840 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 23:47:18,841 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 23:47:18,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 23:47:18,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 23:47:18,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 23:47:18,847 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-21 23:47:18,847 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-21 23:47:18,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:18,847 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-21 23:47:18,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 23:47:18,848 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-21 23:47:18,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 23:47:18,849 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:18,849 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 23:47:18,849 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 23:47:18,849 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:18,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:18,850 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-08-21 23:47:18,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:18,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1945356683] [2020-08-21 23:47:18,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:18,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:18,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:18,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:18,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:18,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,183 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,259 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 23:47:19,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1945356683] [2020-08-21 23:47:19,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:19,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 23:47:19,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496253911] [2020-08-21 23:47:19,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 23:47:19,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:19,261 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 23:47:19,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-08-21 23:47:19,261 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-08-21 23:47:19,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:19,434 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-21 23:47:19,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 23:47:19,435 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-08-21 23:47:19,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:19,436 INFO L225 Difference]: With dead ends: 55 [2020-08-21 23:47:19,436 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 23:47:19,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-08-21 23:47:19,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 23:47:19,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 23:47:19,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 23:47:19,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 23:47:19,443 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-21 23:47:19,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:19,443 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 23:47:19,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 23:47:19,444 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 23:47:19,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 23:47:19,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:19,445 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 23:47:19,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 23:47:19,445 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:19,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:19,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-08-21 23:47:19,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:19,446 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [135807207] [2020-08-21 23:47:19,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:19,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:19,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:19,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:19,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:19,841 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 23:47:19,842 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [135807207] [2020-08-21 23:47:19,842 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:19,842 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 23:47:19,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717274043] [2020-08-21 23:47:19,843 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 23:47:19,843 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:19,843 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 23:47:19,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2020-08-21 23:47:19,844 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2020-08-21 23:47:20,034 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:20,035 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-21 23:47:20,035 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 23:47:20,035 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2020-08-21 23:47:20,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:20,036 INFO L225 Difference]: With dead ends: 58 [2020-08-21 23:47:20,036 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 23:47:20,037 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 23:47:20,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 23:47:20,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 23:47:20,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 23:47:20,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-21 23:47:20,043 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-21 23:47:20,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:20,043 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-21 23:47:20,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 23:47:20,044 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-21 23:47:20,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 23:47:20,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:20,045 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 23:47:20,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 23:47:20,045 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:20,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:20,046 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-08-21 23:47:20,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:20,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105429022] [2020-08-21 23:47:20,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:20,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:20,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,078 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:20,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,190 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,490 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 23:47:20,491 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105429022] [2020-08-21 23:47:20,491 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:20,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 23:47:20,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210004518] [2020-08-21 23:47:20,492 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 23:47:20,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:20,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 23:47:20,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-08-21 23:47:20,493 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2020-08-21 23:47:20,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:20,724 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-21 23:47:20,724 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 23:47:20,724 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2020-08-21 23:47:20,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:20,725 INFO L225 Difference]: With dead ends: 61 [2020-08-21 23:47:20,725 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 23:47:20,726 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 23:47:20,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 23:47:20,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 23:47:20,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 23:47:20,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 23:47:20,731 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-21 23:47:20,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:20,732 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 23:47:20,732 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 23:47:20,732 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 23:47:20,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 23:47:20,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:20,733 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 23:47:20,733 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 23:47:20,733 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:20,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:20,734 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-08-21 23:47:20,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:20,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295089439] [2020-08-21 23:47:20,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:20,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 23:47:20,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 23:47:20,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,905 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:20,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:20,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 23:47:21,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 23:47:21,285 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 23:47:21,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295089439] [2020-08-21 23:47:21,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 23:47:21,286 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 23:47:21,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384691791] [2020-08-21 23:47:21,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 23:47:21,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 23:47:21,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 23:47:21,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2020-08-21 23:47:21,287 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2020-08-21 23:47:21,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 23:47:21,489 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-21 23:47:21,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 23:47:21,489 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-21 23:47:21,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 23:47:21,490 INFO L225 Difference]: With dead ends: 64 [2020-08-21 23:47:21,491 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 23:47:21,492 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 23:47:21,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 23:47:21,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 23:47:21,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 23:47:21,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-21 23:47:21,497 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-21 23:47:21,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 23:47:21,498 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-21 23:47:21,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 23:47:21,498 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-21 23:47:21,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 23:47:21,499 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 23:47:21,499 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 23:47:21,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 23:47:21,499 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 23:47:21,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 23:47:21,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-08-21 23:47:21,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 23:47:21,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313570070] [2020-08-21 23:47:21,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 23:47:21,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 23:47:21,522 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 23:47:21,522 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 23:47:21,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 23:47:21,554 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 11:47:21 BoogieIcfgContainer [2020-08-21 23:47:21,554 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 23:47:21,557 INFO L168 Benchmark]: Toolchain (without parser) took 7581.87 ms. Allocated memory was 140.0 MB in the beginning and 312.5 MB in the end (delta: 172.5 MB). Free memory was 102.1 MB in the beginning and 209.5 MB in the end (delta: -107.4 MB). Peak memory consumption was 65.1 MB. Max. memory is 7.1 GB. [2020-08-21 23:47:21,558 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 140.0 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 23:47:21,559 INFO L168 Benchmark]: CACSL2BoogieTranslator took 270.81 ms. Allocated memory is still 140.0 MB. Free memory was 101.9 MB in the beginning and 92.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-21 23:47:21,560 INFO L168 Benchmark]: Boogie Preprocessor took 29.86 ms. Allocated memory is still 140.0 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-21 23:47:21,560 INFO L168 Benchmark]: RCFGBuilder took 388.64 ms. Allocated memory was 140.0 MB in the beginning and 207.1 MB in the end (delta: 67.1 MB). Free memory was 91.3 MB in the beginning and 175.0 MB in the end (delta: -83.7 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. [2020-08-21 23:47:21,561 INFO L168 Benchmark]: TraceAbstraction took 6887.47 ms. Allocated memory was 207.1 MB in the beginning and 312.5 MB in the end (delta: 105.4 MB). Free memory was 175.0 MB in the beginning and 209.5 MB in the end (delta: -34.6 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. [2020-08-21 23:47:21,565 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 140.0 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 270.81 ms. Allocated memory is still 140.0 MB. Free memory was 101.9 MB in the beginning and 92.7 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 29.86 ms. Allocated memory is still 140.0 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 388.64 ms. Allocated memory was 140.0 MB in the beginning and 207.1 MB in the end (delta: 67.1 MB). Free memory was 91.3 MB in the beginning and 175.0 MB in the end (delta: -83.7 MB). Peak memory consumption was 12.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 6887.47 ms. Allocated memory was 207.1 MB in the beginning and 312.5 MB in the end (delta: 105.4 MB). Free memory was 175.0 MB in the beginning and 209.5 MB in the end (delta: -34.6 MB). Peak memory consumption was 70.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 15; [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] int result = id(input); [L12] COND TRUE result == 15 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 6.8s, OverallIterations: 16, TraceHistogramMax: 16, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 199 SDtfs, 318 SDslu, 762 SDs, 0 SdLazy, 455 SolverSat, 33 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 555 GetRequests, 285 SyntacticMatches, 0 SemanticMatches, 270 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1015 ImplicationChecksByTransitivity, 2.6s 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, 0.1s SatisfiabilityAnalysisTime, 4.0s 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...