/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER -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 0.1.25-5644d1e-m [2020-08-18 19:29:25,844 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 19:29:25,847 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 19:29:25,873 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 19:29:25,873 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 19:29:25,874 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 19:29:25,876 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 19:29:25,878 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 19:29:25,880 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 19:29:25,881 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 19:29:25,882 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 19:29:25,883 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 19:29:25,883 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 19:29:25,885 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 19:29:25,886 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 19:29:25,887 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 19:29:25,888 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 19:29:25,889 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 19:29:25,891 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 19:29:25,893 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 19:29:25,895 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 19:29:25,896 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 19:29:25,897 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 19:29:25,898 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 19:29:25,901 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 19:29:25,905 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 19:29:25,905 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 19:29:25,906 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 19:29:25,907 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 19:29:25,911 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 19:29:25,911 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 19:29:25,912 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 19:29:25,912 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 19:29:25,915 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 19:29:25,916 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 19:29:25,916 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 19:29:25,917 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 19:29:25,917 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 19:29:25,917 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 19:29:25,919 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 19:29:25,921 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 19:29:25,921 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 [2020-08-18 19:29:25,973 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 19:29:25,973 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 19:29:25,975 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 19:29:25,975 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 19:29:25,975 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 19:29:25,975 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 19:29:25,979 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 19:29:25,979 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 19:29:25,979 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 19:29:25,979 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 19:29:25,981 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 19:29:25,981 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 19:29:25,981 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 19:29:25,981 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 19:29:25,981 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 19:29:25,982 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 19:29:25,982 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 19:29:25,982 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 19:29:25,982 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 19:29:25,982 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 19:29:25,983 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 19:29:25,983 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 19:29:25,983 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 19:29:25,983 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 19:29:25,983 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 19:29:25,985 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 19:29:25,985 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 19:29:25,985 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 19:29:25,985 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 19:29:25,986 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=5;interpolation-heuristic=HIGHLEXORDER; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=HIGHLEXORDER; [2020-08-18 19:29:26,336 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 19:29:26,350 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 19:29:26,354 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 19:29:26,355 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 19:29:26,356 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 19:29:26,357 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i15_o15-2.c [2020-08-18 19:29:26,434 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6eb54cae4/f6475171d3f1417db42649ad7b7c2c4f/FLAG728ee1260 [2020-08-18 19:29:26,880 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 19:29:26,881 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_i15_o15-2.c [2020-08-18 19:29:26,888 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6eb54cae4/f6475171d3f1417db42649ad7b7c2c4f/FLAG728ee1260 [2020-08-18 19:29:27,250 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/6eb54cae4/f6475171d3f1417db42649ad7b7c2c4f [2020-08-18 19:29:27,261 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 19:29:27,263 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 19:29:27,264 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 19:29:27,264 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 19:29:27,268 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 19:29:27,269 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,272 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@88af870 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27, skipping insertion in model container [2020-08-18 19:29:27,273 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,281 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 19:29:27,301 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 19:29:27,472 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:29:27,476 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 19:29:27,490 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 19:29:27,501 INFO L208 MainTranslator]: Completed translation [2020-08-18 19:29:27,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27 WrapperNode [2020-08-18 19:29:27,502 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 19:29:27,502 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 19:29:27,503 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 19:29:27,503 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 19:29:27,513 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,513 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,518 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,518 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,521 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,523 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,524 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (1/1) ... [2020-08-18 19:29:27,526 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 19:29:27,526 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 19:29:27,526 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 19:29:27,527 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 19:29:27,527 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (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 [2020-08-18 19:29:27,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 19:29:27,683 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 19:29:27,683 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-18 19:29:27,683 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 19:29:27,683 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 19:29:27,684 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 19:29:27,684 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-18 19:29:27,684 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 19:29:27,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 19:29:27,684 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 19:29:27,869 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 19:29:27,870 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-18 19:29:27,874 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:29:27 BoogieIcfgContainer [2020-08-18 19:29:27,874 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 19:29:27,876 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 19:29:27,877 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 19:29:27,881 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 19:29:27,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 07:29:27" (1/3) ... [2020-08-18 19:29:27,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@415f4341 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:29:27, skipping insertion in model container [2020-08-18 19:29:27,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 07:29:27" (2/3) ... [2020-08-18 19:29:27,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@415f4341 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 07:29:27, skipping insertion in model container [2020-08-18 19:29:27,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 07:29:27" (3/3) ... [2020-08-18 19:29:27,885 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i15_o15-2.c [2020-08-18 19:29:27,896 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 19:29:27,905 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 19:29:27,917 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 19:29:27,951 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 19:29:27,951 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 19:29:27,952 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 19:29:27,952 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 19:29:27,954 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 19:29:27,954 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 19:29:27,954 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 19:29:27,955 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 19:29:27,975 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-18 19:29:27,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-18 19:29:27,983 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:27,984 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:27,984 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:27,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:27,990 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-18 19:29:27,997 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:27,997 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930059189] [2020-08-18 19:29:27,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:28,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:28,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:28,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,264 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 19:29:28,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930059189] [2020-08-18 19:29:28,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 19:29:28,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 19:29:28,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [25075582] [2020-08-18 19:29:28,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 19:29:28,279 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:28,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 19:29:28,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 19:29:28,301 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-18 19:29:28,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:28,393 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-18 19:29:28,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 19:29:28,396 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-18 19:29:28,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:28,407 INFO L225 Difference]: With dead ends: 30 [2020-08-18 19:29:28,408 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 19:29:28,412 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 [2020-08-18 19:29:28,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 19:29:28,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-18 19:29:28,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 19:29:28,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-18 19:29:28,456 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-18 19:29:28,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:28,457 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-18 19:29:28,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 19:29:28,457 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-18 19:29:28,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 19:29:28,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:28,460 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:28,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 19:29:28,460 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:28,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:28,461 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-18 19:29:28,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:28,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1284466965] [2020-08-18 19:29:28,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:28,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:28,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:28,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:28,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,597 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-18 19:29:28,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1284466965] [2020-08-18 19:29:28,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:28,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 19:29:28,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710182995] [2020-08-18 19:29:28,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 19:29:28,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:28,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 19:29:28,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 19:29:28,603 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-18 19:29:28,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:28,666 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-18 19:29:28,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 19:29:28,667 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 19:29:28,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:28,668 INFO L225 Difference]: With dead ends: 25 [2020-08-18 19:29:28,669 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 19:29:28,670 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 [2020-08-18 19:29:28,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 19:29:28,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-18 19:29:28,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 19:29:28,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 19:29:28,680 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-18 19:29:28,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:28,682 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 19:29:28,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 19:29:28,683 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 19:29:28,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 19:29:28,685 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:28,685 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:28,686 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 19:29:28,687 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:28,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:28,688 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-18 19:29:28,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:28,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [870443629] [2020-08-18 19:29:28,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:28,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:28,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:28,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:28,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:28,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:28,908 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-18 19:29:28,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [870443629] [2020-08-18 19:29:28,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:28,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 19:29:28,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208579963] [2020-08-18 19:29:28,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 19:29:28,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:28,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 19:29:28,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 19:29:28,911 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-18 19:29:28,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:28,986 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-18 19:29:28,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 19:29:28,987 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-18 19:29:28,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:28,988 INFO L225 Difference]: With dead ends: 28 [2020-08-18 19:29:28,988 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 19:29:28,989 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 [2020-08-18 19:29:28,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 19:29:28,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-18 19:29:28,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 19:29:28,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-18 19:29:28,996 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-18 19:29:28,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:28,997 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-18 19:29:28,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 19:29:28,997 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-18 19:29:28,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 19:29:28,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:28,999 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:28,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 19:29:28,999 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:29,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:29,000 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-18 19:29:29,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:29,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [352541664] [2020-08-18 19:29:29,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:29,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,036 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:29,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:29,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,292 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-18 19:29:29,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [352541664] [2020-08-18 19:29:29,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:29,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 19:29:29,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322639529] [2020-08-18 19:29:29,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 19:29:29,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:29,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 19:29:29,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-18 19:29:29,299 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-18 19:29:29,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:29,400 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-18 19:29:29,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 19:29:29,401 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-18 19:29:29,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:29,402 INFO L225 Difference]: With dead ends: 31 [2020-08-18 19:29:29,403 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 19:29:29,403 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:29:29,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 19:29:29,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-18 19:29:29,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 19:29:29,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 19:29:29,411 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-18 19:29:29,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:29,411 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 19:29:29,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 19:29:29,411 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 19:29:29,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 19:29:29,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:29,413 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:29,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 19:29:29,414 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:29,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:29,414 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-08-18 19:29:29,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:29,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1258069609] [2020-08-18 19:29:29,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:29,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:29,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:29,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,526 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,618 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-18 19:29:29,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1258069609] [2020-08-18 19:29:29,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:29,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 19:29:29,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072605840] [2020-08-18 19:29:29,621 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 19:29:29,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:29,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 19:29:29,622 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-18 19:29:29,623 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-18 19:29:29,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:29,746 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-18 19:29:29,746 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 19:29:29,746 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-18 19:29:29,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:29,748 INFO L225 Difference]: With dead ends: 34 [2020-08-18 19:29:29,748 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 19:29:29,749 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 [2020-08-18 19:29:29,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 19:29:29,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-18 19:29:29,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 19:29:29,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-18 19:29:29,763 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-18 19:29:29,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:29,764 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-18 19:29:29,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 19:29:29,764 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-18 19:29:29,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 19:29:29,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:29,766 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:29,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 19:29:29,766 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:29,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:29,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-08-18 19:29:29,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:29,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [913749678] [2020-08-18 19:29:29,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:29,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:29,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:29,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:29,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:29,952 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-18 19:29:29,953 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [913749678] [2020-08-18 19:29:29,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:29,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 19:29:29,954 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114041569] [2020-08-18 19:29:29,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 19:29:29,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:29,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 19:29:29,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-18 19:29:29,955 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-18 19:29:30,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:30,048 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-18 19:29:30,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 19:29:30,048 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-18 19:29:30,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:30,050 INFO L225 Difference]: With dead ends: 37 [2020-08-18 19:29:30,050 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 19:29:30,051 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 [2020-08-18 19:29:30,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 19:29:30,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-18 19:29:30,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 19:29:30,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 19:29:30,058 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-18 19:29:30,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:30,059 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 19:29:30,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 19:29:30,059 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 19:29:30,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 19:29:30,061 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:30,061 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:30,061 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 19:29:30,062 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:30,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:30,062 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-08-18 19:29:30,062 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:30,063 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058590707] [2020-08-18 19:29:30,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:30,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:30,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:30,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,300 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-18 19:29:30,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058590707] [2020-08-18 19:29:30,301 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:30,301 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 19:29:30,301 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891937632] [2020-08-18 19:29:30,302 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 19:29:30,302 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:30,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 19:29:30,303 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-18 19:29:30,303 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 19:29:30,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:30,431 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-18 19:29:30,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 19:29:30,433 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-18 19:29:30,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:30,436 INFO L225 Difference]: With dead ends: 40 [2020-08-18 19:29:30,437 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 19:29:30,438 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 [2020-08-18 19:29:30,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 19:29:30,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-18 19:29:30,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 19:29:30,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-18 19:29:30,450 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-18 19:29:30,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:30,451 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-18 19:29:30,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 19:29:30,451 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-18 19:29:30,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 19:29:30,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:30,456 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:30,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 19:29:30,457 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:30,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:30,459 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-08-18 19:29:30,459 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:30,461 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159679741] [2020-08-18 19:29:30,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:30,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:30,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:30,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,683 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,771 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-18 19:29:30,772 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159679741] [2020-08-18 19:29:30,772 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:30,772 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 19:29:30,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1373699027] [2020-08-18 19:29:30,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 19:29:30,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:30,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 19:29:30,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-18 19:29:30,776 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-18 19:29:30,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:30,911 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-18 19:29:30,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 19:29:30,912 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-18 19:29:30,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:30,913 INFO L225 Difference]: With dead ends: 43 [2020-08-18 19:29:30,914 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 19:29:30,915 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 [2020-08-18 19:29:30,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 19:29:30,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 19:29:30,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 19:29:30,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 19:29:30,922 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-18 19:29:30,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:30,922 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 19:29:30,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 19:29:30,923 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 19:29:30,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 19:29:30,924 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:30,924 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:30,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 19:29:30,925 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:30,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:30,925 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-08-18 19:29:30,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:30,926 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2042312221] [2020-08-18 19:29:30,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:30,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:30,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:30,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:30,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:30,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,228 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-18 19:29:31,229 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2042312221] [2020-08-18 19:29:31,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:31,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 19:29:31,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622763127] [2020-08-18 19:29:31,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 19:29:31,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:31,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 19:29:31,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-18 19:29:31,232 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-18 19:29:31,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:31,360 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-18 19:29:31,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 19:29:31,361 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-18 19:29:31,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:31,362 INFO L225 Difference]: With dead ends: 46 [2020-08-18 19:29:31,362 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 19:29:31,363 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 [2020-08-18 19:29:31,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 19:29:31,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-18 19:29:31,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 19:29:31,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-18 19:29:31,370 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-18 19:29:31,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:31,371 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-18 19:29:31,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 19:29:31,371 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-18 19:29:31,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 19:29:31,372 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:31,373 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:31,373 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 19:29:31,373 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:31,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:31,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-08-18 19:29:31,374 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:31,374 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1152481455] [2020-08-18 19:29:31,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:31,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:31,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:31,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,606 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,708 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-18 19:29:31,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1152481455] [2020-08-18 19:29:31,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:31,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 19:29:31,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492926111] [2020-08-18 19:29:31,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 19:29:31,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:31,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 19:29:31,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-18 19:29:31,711 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-18 19:29:31,850 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:31,850 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 19:29:31,851 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 19:29:31,851 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-18 19:29:31,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:31,852 INFO L225 Difference]: With dead ends: 49 [2020-08-18 19:29:31,853 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 19:29:31,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2020-08-18 19:29:31,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 19:29:31,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-18 19:29:31,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 19:29:31,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-18 19:29:31,860 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-18 19:29:31,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:31,861 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-18 19:29:31,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 19:29:31,861 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-18 19:29:31,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 19:29:31,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:31,863 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:31,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 19:29:31,863 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:31,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:31,864 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-08-18 19:29:31,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:31,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1337815449] [2020-08-18 19:29:31,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:31,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:31,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:31,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,970 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:31,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:31,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,027 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,217 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-18 19:29:32,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1337815449] [2020-08-18 19:29:32,218 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:32,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 19:29:32,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354221500] [2020-08-18 19:29:32,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 19:29:32,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:32,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 19:29:32,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2020-08-18 19:29:32,221 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2020-08-18 19:29:32,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:32,377 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-18 19:29:32,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 19:29:32,378 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2020-08-18 19:29:32,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:32,380 INFO L225 Difference]: With dead ends: 52 [2020-08-18 19:29:32,380 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 19:29:32,382 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 [2020-08-18 19:29:32,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 19:29:32,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-18 19:29:32,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 19:29:32,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-18 19:29:32,389 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-18 19:29:32,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:32,389 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-18 19:29:32,390 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 19:29:32,390 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-18 19:29:32,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 19:29:32,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:32,392 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:32,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 19:29:32,392 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:32,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:32,393 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-08-18 19:29:32,393 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:32,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1281146021] [2020-08-18 19:29:32,394 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:32,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:32,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:32,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,516 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:32,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:32,892 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-18 19:29:32,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1281146021] [2020-08-18 19:29:32,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:32,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 19:29:32,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856087019] [2020-08-18 19:29:32,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 19:29:32,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:32,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 19:29:32,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-08-18 19:29:32,895 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-08-18 19:29:33,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:33,095 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-18 19:29:33,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 19:29:33,096 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-08-18 19:29:33,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:33,097 INFO L225 Difference]: With dead ends: 55 [2020-08-18 19:29:33,097 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 19:29:33,099 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 [2020-08-18 19:29:33,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 19:29:33,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-18 19:29:33,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 19:29:33,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-18 19:29:33,114 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-18 19:29:33,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:33,116 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-18 19:29:33,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 19:29:33,116 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-18 19:29:33,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 19:29:33,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:33,118 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:33,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 19:29:33,119 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:33,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:33,119 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-08-18 19:29:33,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:33,120 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1142149515] [2020-08-18 19:29:33,120 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:33,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:33,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:33,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,499 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,608 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-18 19:29:33,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1142149515] [2020-08-18 19:29:33,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:33,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 19:29:33,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630903639] [2020-08-18 19:29:33,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 19:29:33,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:33,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 19:29:33,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2020-08-18 19:29:33,610 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2020-08-18 19:29:33,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:33,781 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-18 19:29:33,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 19:29:33,782 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2020-08-18 19:29:33,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:33,783 INFO L225 Difference]: With dead ends: 58 [2020-08-18 19:29:33,783 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 19:29:33,784 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 [2020-08-18 19:29:33,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 19:29:33,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-18 19:29:33,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 19:29:33,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-18 19:29:33,790 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-18 19:29:33,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:33,790 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-18 19:29:33,790 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 19:29:33,790 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-18 19:29:33,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-18 19:29:33,791 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:33,792 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:33,792 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 19:29:33,792 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:33,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:33,792 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-08-18 19:29:33,793 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:33,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581055821] [2020-08-18 19:29:33,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:33,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:33,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:33,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:33,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:33,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,370 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-18 19:29:34,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581055821] [2020-08-18 19:29:34,371 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:34,371 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 19:29:34,371 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254172602] [2020-08-18 19:29:34,372 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 19:29:34,372 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:34,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 19:29:34,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-08-18 19:29:34,374 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2020-08-18 19:29:34,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:34,589 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-18 19:29:34,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 19:29:34,591 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2020-08-18 19:29:34,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:34,592 INFO L225 Difference]: With dead ends: 61 [2020-08-18 19:29:34,592 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 19:29:34,593 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 [2020-08-18 19:29:34,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 19:29:34,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-18 19:29:34,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 19:29:34,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-18 19:29:34,609 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-18 19:29:34,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:34,609 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-18 19:29:34,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 19:29:34,609 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-18 19:29:34,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-18 19:29:34,612 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:34,612 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:34,612 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 19:29:34,614 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:34,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:34,614 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-08-18 19:29:34,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:34,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207579954] [2020-08-18 19:29:34,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:34,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 19:29:34,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-18 19:29:34,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,867 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:34,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:34,999 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:35,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:35,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:35,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:35,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:35,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:35,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:35,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:35,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:35,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:35,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:35,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:35,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-18 19:29:35,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 19:29:35,301 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-18 19:29:35,301 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207579954] [2020-08-18 19:29:35,302 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 19:29:35,302 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 19:29:35,302 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076275357] [2020-08-18 19:29:35,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 19:29:35,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 19:29:35,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 19:29:35,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2020-08-18 19:29:35,304 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2020-08-18 19:29:35,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 19:29:35,552 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-18 19:29:35,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 19:29:35,553 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-18 19:29:35,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 19:29:35,554 INFO L225 Difference]: With dead ends: 64 [2020-08-18 19:29:35,555 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 19:29:35,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 19:29:35,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 19:29:35,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-18 19:29:35,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 19:29:35,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-18 19:29:35,561 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-18 19:29:35,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 19:29:35,562 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-18 19:29:35,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 19:29:35,562 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-18 19:29:35,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-18 19:29:35,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 19:29:35,564 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 19:29:35,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 19:29:35,564 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 19:29:35,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 19:29:35,565 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-08-18 19:29:35,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 19:29:35,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140548006] [2020-08-18 19:29:35,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 19:29:35,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-18 19:29:35,588 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-18 19:29:35,588 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-18 19:29:35,593 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 19:29:35,617 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 18.08 07:29:35 BoogieIcfgContainer [2020-08-18 19:29:35,618 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-18 19:29:35,623 INFO L168 Benchmark]: Toolchain (without parser) took 8357.13 ms. Allocated memory was 141.6 MB in the beginning and 336.6 MB in the end (delta: 195.0 MB). Free memory was 105.1 MB in the beginning and 116.4 MB in the end (delta: -11.2 MB). Peak memory consumption was 183.8 MB. Max. memory is 7.1 GB. [2020-08-18 19:29:35,623 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-18 19:29:35,624 INFO L168 Benchmark]: CACSL2BoogieTranslator took 237.95 ms. Allocated memory is still 141.6 MB. Free memory was 104.9 MB in the beginning and 95.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-18 19:29:35,627 INFO L168 Benchmark]: Boogie Preprocessor took 23.47 ms. Allocated memory is still 141.6 MB. Free memory was 95.6 MB in the beginning and 94.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-08-18 19:29:35,628 INFO L168 Benchmark]: RCFGBuilder took 347.73 ms. Allocated memory was 141.6 MB in the beginning and 202.9 MB in the end (delta: 61.3 MB). Free memory was 94.3 MB in the beginning and 171.4 MB in the end (delta: -77.2 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-18 19:29:35,633 INFO L168 Benchmark]: TraceAbstraction took 7742.00 ms. Allocated memory was 202.9 MB in the beginning and 336.6 MB in the end (delta: 133.7 MB). Free memory was 170.8 MB in the beginning and 116.4 MB in the end (delta: 54.4 MB). Peak memory consumption was 188.1 MB. Max. memory is 7.1 GB. [2020-08-18 19:29:35,636 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 141.6 MB. Free memory was 123.1 MB in the beginning and 122.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 237.95 ms. Allocated memory is still 141.6 MB. Free memory was 104.9 MB in the beginning and 95.6 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 23.47 ms. Allocated memory is still 141.6 MB. Free memory was 95.6 MB in the beginning and 94.3 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 347.73 ms. Allocated memory was 141.6 MB in the beginning and 202.9 MB in the end (delta: 61.3 MB). Free memory was 94.3 MB in the beginning and 171.4 MB in the end (delta: -77.2 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 7742.00 ms. Allocated memory was 202.9 MB in the beginning and 336.6 MB in the end (delta: 133.7 MB). Free memory was 170.8 MB in the beginning and 116.4 MB in the end (delta: 54.4 MB). Peak memory consumption was 188.1 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: 7.6s, 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, 2.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=60occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 15 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.6s 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...