/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=HIGHLEXORDER --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/sum_20x0-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 18:56:49,716 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 18:56:49,719 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 18:56:49,747 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 18:56:49,748 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 18:56:49,749 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 18:56:49,750 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 18:56:49,752 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 18:56:49,754 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 18:56:49,755 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 18:56:49,756 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 18:56:49,757 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 18:56:49,758 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 18:56:49,759 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 18:56:49,760 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 18:56:49,761 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 18:56:49,762 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 18:56:49,764 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 18:56:49,766 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 18:56:49,768 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 18:56:49,770 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 18:56:49,772 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 18:56:49,773 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 18:56:49,774 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 18:56:49,777 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 18:56:49,778 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 18:56:49,778 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 18:56:49,779 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 18:56:49,780 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 18:56:49,781 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 18:56:49,781 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 18:56:49,782 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 18:56:49,783 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 18:56:49,784 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 18:56:49,785 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 18:56:49,785 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 18:56:49,786 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 18:56:49,786 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 18:56:49,787 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 18:56:49,788 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 18:56:49,789 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 18:56:49,790 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 18:56:49,821 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 18:56:49,821 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 18:56:49,826 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 18:56:49,826 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 18:56:49,827 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 18:56:49,827 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 18:56:49,827 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 18:56:49,827 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 18:56:49,827 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 18:56:49,828 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 18:56:49,828 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 18:56:49,828 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 18:56:49,828 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 18:56:49,828 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 18:56:49,829 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 18:56:49,829 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 18:56:49,830 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 18:56:49,830 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 18:56:49,830 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 18:56:49,830 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 18:56:49,831 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 18:56:49,831 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:56:49,832 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 18:56:49,832 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 18:56:49,832 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 18:56:49,832 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 18:56:49,832 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 18:56:49,833 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 18:56:49,833 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 18:56:49,833 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=HIGHLEXORDER;log-additional-information=true; [2020-08-21 18:56:50,141 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 18:56:50,161 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 18:56:50,172 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 18:56:50,173 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 18:56:50,173 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 18:56:50,174 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/sum_20x0-1.c [2020-08-21 18:56:50,242 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/22efa7144/32f5a224faec4bef9e287c7f410595be/FLAGd84de5228 [2020-08-21 18:56:50,709 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 18:56:50,711 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/sum_20x0-1.c [2020-08-21 18:56:50,717 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/22efa7144/32f5a224faec4bef9e287c7f410595be/FLAGd84de5228 [2020-08-21 18:56:51,088 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/22efa7144/32f5a224faec4bef9e287c7f410595be [2020-08-21 18:56:51,097 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 18:56:51,099 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 18:56:51,101 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 18:56:51,101 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 18:56:51,105 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 18:56:51,106 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,109 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@42a688b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51, skipping insertion in model container [2020-08-21 18:56:51,109 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,118 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 18:56:51,133 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 18:56:51,301 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:56:51,306 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 18:56:51,322 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 18:56:51,334 INFO L208 MainTranslator]: Completed translation [2020-08-21 18:56:51,335 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51 WrapperNode [2020-08-21 18:56:51,335 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 18:56:51,336 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 18:56:51,336 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 18:56:51,336 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 18:56:51,346 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,347 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,351 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,352 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,355 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,357 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,358 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... [2020-08-21 18:56:51,360 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 18:56:51,361 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 18:56:51,361 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 18:56:51,361 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 18:56:51,362 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 18:56:51,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 18:56:51,518 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 18:56:51,518 INFO L138 BoogieDeclarations]: Found implementation of procedure sum [2020-08-21 18:56:51,519 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 18:56:51,519 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 18:56:51,519 INFO L130 BoogieDeclarations]: Found specification of procedure sum [2020-08-21 18:56:51,519 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 18:56:51,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 18:56:51,520 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 18:56:51,688 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 18:56:51,688 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 18:56:51,692 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:56:51 BoogieIcfgContainer [2020-08-21 18:56:51,692 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 18:56:51,693 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 18:56:51,693 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 18:56:51,697 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 18:56:51,697 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 06:56:51" (1/3) ... [2020-08-21 18:56:51,698 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7030fba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:56:51, skipping insertion in model container [2020-08-21 18:56:51,698 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 06:56:51" (2/3) ... [2020-08-21 18:56:51,699 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7030fba5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 06:56:51, skipping insertion in model container [2020-08-21 18:56:51,699 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 06:56:51" (3/3) ... [2020-08-21 18:56:51,701 INFO L109 eAbstractionObserver]: Analyzing ICFG sum_20x0-1.c [2020-08-21 18:56:51,712 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 18:56:51,720 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 18:56:51,732 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 18:56:51,759 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 18:56:51,759 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 18:56:51,760 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 18:56:51,760 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 18:56:51,760 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 18:56:51,760 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 18:56:51,760 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 18:56:51,760 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 18:56:51,779 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 18:56:51,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 18:56:51,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:51,788 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:51,788 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:51,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:51,793 INFO L82 PathProgramCache]: Analyzing trace with hash 2001781660, now seen corresponding path program 1 times [2020-08-21 18:56:51,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:51,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [567625272] [2020-08-21 18:56:51,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:51,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:51,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:51,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:51,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:51,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,222 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 18:56:52,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [567625272] [2020-08-21 18:56:52,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 18:56:52,226 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 18:56:52,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073887300] [2020-08-21 18:56:52,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 18:56:52,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:52,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 18:56:52,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 18:56:52,260 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 18:56:52,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:52,344 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-21 18:56:52,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 18:56:52,346 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 18:56:52,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:52,357 INFO L225 Difference]: With dead ends: 30 [2020-08-21 18:56:52,357 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 18:56:52,361 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:56:52,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 18:56:52,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 18:56:52,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 18:56:52,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 18:56:52,402 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 18:56:52,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:52,403 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 18:56:52,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 18:56:52,403 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 18:56:52,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 18:56:52,405 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:52,405 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:52,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 18:56:52,406 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:52,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:52,407 INFO L82 PathProgramCache]: Analyzing trace with hash -118151420, now seen corresponding path program 1 times [2020-08-21 18:56:52,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:52,408 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1555707068] [2020-08-21 18:56:52,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:52,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:52,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,452 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:52,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:52,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,530 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 18:56:52,531 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1555707068] [2020-08-21 18:56:52,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:52,531 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 18:56:52,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856649050] [2020-08-21 18:56:52,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 18:56:52,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:52,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 18:56:52,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 18:56:52,535 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-21 18:56:52,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:52,593 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 18:56:52,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 18:56:52,594 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 18:56:52,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:52,595 INFO L225 Difference]: With dead ends: 25 [2020-08-21 18:56:52,595 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 18:56:52,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:56:52,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 18:56:52,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 18:56:52,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 18:56:52,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 18:56:52,606 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 18:56:52,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:52,608 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 18:56:52,608 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 18:56:52,608 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 18:56:52,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 18:56:52,610 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:52,610 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:52,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 18:56:52,611 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:52,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:52,611 INFO L82 PathProgramCache]: Analyzing trace with hash 764931548, now seen corresponding path program 2 times [2020-08-21 18:56:52,612 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:52,613 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1380545699] [2020-08-21 18:56:52,613 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:52,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:52,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:52,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:52,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:52,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,786 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 18:56:52,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1380545699] [2020-08-21 18:56:52,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:52,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 18:56:52,790 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745777577] [2020-08-21 18:56:52,791 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 18:56:52,791 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:52,791 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 18:56:52,791 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 18:56:52,792 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-21 18:56:52,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:52,878 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 18:56:52,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 18:56:52,879 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 18:56:52,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:52,880 INFO L225 Difference]: With dead ends: 28 [2020-08-21 18:56:52,881 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 18:56:52,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:56:52,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 18:56:52,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 18:56:52,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 18:56:52,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 18:56:52,889 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 18:56:52,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:52,890 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 18:56:52,890 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 18:56:52,891 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 18:56:52,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 18:56:52,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:52,892 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:52,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 18:56:52,893 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:52,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:52,893 INFO L82 PathProgramCache]: Analyzing trace with hash 601942852, now seen corresponding path program 3 times [2020-08-21 18:56:52,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:52,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [858605216] [2020-08-21 18:56:52,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:52,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:52,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:52,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:52,981 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:52,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,063 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-21 18:56:53,063 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [858605216] [2020-08-21 18:56:53,064 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:53,064 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 18:56:53,064 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [58069714] [2020-08-21 18:56:53,065 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 18:56:53,065 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:53,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 18:56:53,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 18:56:53,066 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-21 18:56:53,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:53,176 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-21 18:56:53,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 18:56:53,177 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 18:56:53,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:53,179 INFO L225 Difference]: With dead ends: 31 [2020-08-21 18:56:53,179 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 18:56:53,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:56:53,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 18:56:53,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 18:56:53,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 18:56:53,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 18:56:53,194 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-21 18:56:53,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:53,196 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 18:56:53,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 18:56:53,197 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 18:56:53,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 18:56:53,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:53,199 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:53,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 18:56:53,200 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:53,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:53,201 INFO L82 PathProgramCache]: Analyzing trace with hash -183109604, now seen corresponding path program 4 times [2020-08-21 18:56:53,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:53,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176254057] [2020-08-21 18:56:53,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:53,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:53,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:53,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,429 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-21 18:56:53,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176254057] [2020-08-21 18:56:53,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:53,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 18:56:53,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541392749] [2020-08-21 18:56:53,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 18:56:53,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:53,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 18:56:53,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 18:56:53,432 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-21 18:56:53,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:53,530 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 18:56:53,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 18:56:53,532 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-21 18:56:53,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:53,535 INFO L225 Difference]: With dead ends: 34 [2020-08-21 18:56:53,536 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 18:56:53,536 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:56:53,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 18:56:53,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 18:56:53,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 18:56:53,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-21 18:56:53,550 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-21 18:56:53,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:53,550 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-21 18:56:53,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 18:56:53,551 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-21 18:56:53,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 18:56:53,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:53,554 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:53,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 18:56:53,557 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:53,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:53,558 INFO L82 PathProgramCache]: Analyzing trace with hash -155447420, now seen corresponding path program 5 times [2020-08-21 18:56:53,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:53,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [767195888] [2020-08-21 18:56:53,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:53,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:53,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:53,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,695 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,752 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-21 18:56:53,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [767195888] [2020-08-21 18:56:53,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:53,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 18:56:53,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [56948481] [2020-08-21 18:56:53,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 18:56:53,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:53,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 18:56:53,755 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 18:56:53,755 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-21 18:56:53,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:53,851 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-21 18:56:53,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 18:56:53,852 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-21 18:56:53,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:53,854 INFO L225 Difference]: With dead ends: 37 [2020-08-21 18:56:53,854 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 18:56:53,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:56:53,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 18:56:53,860 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 18:56:53,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 18:56:53,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 18:56:53,862 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-21 18:56:53,862 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:53,862 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 18:56:53,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 18:56:53,863 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 18:56:53,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 18:56:53,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:53,864 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:53,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 18:56:53,865 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:53,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:53,866 INFO L82 PathProgramCache]: Analyzing trace with hash 1716183644, now seen corresponding path program 6 times [2020-08-21 18:56:53,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:53,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404466554] [2020-08-21 18:56:53,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:53,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:53,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:53,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:53,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:53,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,099 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-21 18:56:54,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404466554] [2020-08-21 18:56:54,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:54,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 18:56:54,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932262407] [2020-08-21 18:56:54,101 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 18:56:54,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:54,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 18:56:54,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 18:56:54,102 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 18:56:54,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:54,205 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-21 18:56:54,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 18:56:54,205 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-21 18:56:54,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:54,207 INFO L225 Difference]: With dead ends: 40 [2020-08-21 18:56:54,207 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 18:56:54,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:56:54,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 18:56:54,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 18:56:54,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 18:56:54,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-21 18:56:54,215 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-21 18:56:54,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:54,215 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-21 18:56:54,215 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 18:56:54,215 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-21 18:56:54,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 18:56:54,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:54,217 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:54,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 18:56:54,217 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:54,217 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:54,218 INFO L82 PathProgramCache]: Analyzing trace with hash -1079602236, now seen corresponding path program 7 times [2020-08-21 18:56:54,218 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:54,218 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1443010546] [2020-08-21 18:56:54,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:54,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:54,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:54,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,305 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,448 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-21 18:56:54,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1443010546] [2020-08-21 18:56:54,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:54,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 18:56:54,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [269121825] [2020-08-21 18:56:54,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 18:56:54,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:54,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 18:56:54,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-21 18:56:54,451 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-21 18:56:54,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:54,580 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-21 18:56:54,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 18:56:54,580 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-21 18:56:54,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:54,582 INFO L225 Difference]: With dead ends: 43 [2020-08-21 18:56:54,582 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 18:56:54,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:56:54,583 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 18:56:54,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 18:56:54,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 18:56:54,589 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 18:56:54,589 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-21 18:56:54,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:54,590 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 18:56:54,590 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 18:56:54,590 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 18:56:54,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 18:56:54,591 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:54,592 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:54,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 18:56:54,592 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:54,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:54,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1035381916, now seen corresponding path program 8 times [2020-08-21 18:56:54,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:54,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56422345] [2020-08-21 18:56:54,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:54,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:54,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:54,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:54,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:54,869 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-21 18:56:54,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56422345] [2020-08-21 18:56:54,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:54,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 18:56:54,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268836179] [2020-08-21 18:56:54,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 18:56:54,871 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:54,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 18:56:54,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-21 18:56:54,872 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-21 18:56:55,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:55,004 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-21 18:56:55,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 18:56:55,005 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-21 18:56:55,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:55,006 INFO L225 Difference]: With dead ends: 46 [2020-08-21 18:56:55,006 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 18:56:55,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:56:55,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 18:56:55,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 18:56:55,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 18:56:55,014 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-21 18:56:55,014 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-21 18:56:55,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:55,014 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-21 18:56:55,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 18:56:55,015 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-21 18:56:55,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 18:56:55,016 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:55,016 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:55,016 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 18:56:55,016 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:55,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:55,017 INFO L82 PathProgramCache]: Analyzing trace with hash 952137732, now seen corresponding path program 9 times [2020-08-21 18:56:55,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:55,017 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [482989235] [2020-08-21 18:56:55,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:55,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:55,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:55,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,279 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,333 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-21 18:56:55,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [482989235] [2020-08-21 18:56:55,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:55,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 18:56:55,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142375112] [2020-08-21 18:56:55,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 18:56:55,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:55,336 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 18:56:55,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-21 18:56:55,336 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-21 18:56:55,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:55,484 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 18:56:55,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 18:56:55,485 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-21 18:56:55,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:55,486 INFO L225 Difference]: With dead ends: 49 [2020-08-21 18:56:55,486 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 18:56:55,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:56:55,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 18:56:55,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 18:56:55,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 18:56:55,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 18:56:55,496 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-21 18:56:55,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:55,496 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 18:56:55,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 18:56:55,496 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 18:56:55,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 18:56:55,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:55,498 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:55,498 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 18:56:55,498 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:55,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:55,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1540970204, now seen corresponding path program 10 times [2020-08-21 18:56:55,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:55,499 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989785144] [2020-08-21 18:56:55,499 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:55,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:55,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:55,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,829 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:55,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:55,870 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-21 18:56:55,870 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989785144] [2020-08-21 18:56:55,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:55,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 18:56:55,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627856061] [2020-08-21 18:56:55,871 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 18:56:55,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:55,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 18:56:55,872 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2020-08-21 18:56:55,873 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2020-08-21 18:56:56,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:56,027 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-21 18:56:56,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 18:56:56,028 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2020-08-21 18:56:56,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:56,029 INFO L225 Difference]: With dead ends: 52 [2020-08-21 18:56:56,030 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 18:56:56,031 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=236, Invalid=414, Unknown=0, NotChecked=0, Total=650 [2020-08-21 18:56:56,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 18:56:56,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 18:56:56,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 18:56:56,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-21 18:56:56,037 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-21 18:56:56,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:56,038 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-21 18:56:56,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 18:56:56,038 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-21 18:56:56,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 18:56:56,039 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:56,040 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:56,040 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 18:56:56,040 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:56,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:56,040 INFO L82 PathProgramCache]: Analyzing trace with hash -2010530748, now seen corresponding path program 11 times [2020-08-21 18:56:56,041 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:56,042 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497222360] [2020-08-21 18:56:56,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:56,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:56,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:56,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,316 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,403 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,593 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-21 18:56:56,594 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497222360] [2020-08-21 18:56:56,594 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:56,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 18:56:56,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204605013] [2020-08-21 18:56:56,595 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 18:56:56,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:56,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 18:56:56,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-08-21 18:56:56,596 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-08-21 18:56:56,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:56,796 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-21 18:56:56,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 18:56:56,796 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-08-21 18:56:56,797 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:56,797 INFO L225 Difference]: With dead ends: 55 [2020-08-21 18:56:56,797 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 18:56:56,799 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-08-21 18:56:56,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 18:56:56,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 18:56:56,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 18:56:56,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 18:56:56,815 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-21 18:56:56,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:56,815 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 18:56:56,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 18:56:56,816 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 18:56:56,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 18:56:56,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:56,817 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:56,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 18:56:56,817 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:56,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:56,818 INFO L82 PathProgramCache]: Analyzing trace with hash -986521316, now seen corresponding path program 12 times [2020-08-21 18:56:56,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:56,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411424539] [2020-08-21 18:56:56,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:56,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:56,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:56,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:56,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:56,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,226 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,231 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,276 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,401 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-21 18:56:57,401 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411424539] [2020-08-21 18:56:57,401 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:57,402 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 18:56:57,402 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283960389] [2020-08-21 18:56:57,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 18:56:57,403 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:57,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 18:56:57,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2020-08-21 18:56:57,403 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2020-08-21 18:56:57,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:57,591 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-21 18:56:57,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 18:56:57,591 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2020-08-21 18:56:57,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:57,592 INFO L225 Difference]: With dead ends: 58 [2020-08-21 18:56:57,592 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 18:56:57,594 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2020-08-21 18:56:57,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 18:56:57,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 18:56:57,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 18:56:57,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-21 18:56:57,599 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-21 18:56:57,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:57,600 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-21 18:56:57,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 18:56:57,600 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-21 18:56:57,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 18:56:57,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:57,601 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:57,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 18:56:57,602 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:57,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:57,602 INFO L82 PathProgramCache]: Analyzing trace with hash 1073897604, now seen corresponding path program 13 times [2020-08-21 18:56:57,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:57,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081949722] [2020-08-21 18:56:57,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:57,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:57,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:57,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,860 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:57,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:57,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,171 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-21 18:56:58,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081949722] [2020-08-21 18:56:58,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:58,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 18:56:58,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925320472] [2020-08-21 18:56:58,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 18:56:58,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:58,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 18:56:58,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-08-21 18:56:58,174 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2020-08-21 18:56:58,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:58,368 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-21 18:56:58,368 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 18:56:58,368 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2020-08-21 18:56:58,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:58,370 INFO L225 Difference]: With dead ends: 61 [2020-08-21 18:56:58,370 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 18:56:58,371 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=362, Invalid=630, Unknown=0, NotChecked=0, Total=992 [2020-08-21 18:56:58,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 18:56:58,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 18:56:58,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 18:56:58,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 18:56:58,383 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-21 18:56:58,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:58,383 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 18:56:58,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 18:56:58,384 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 18:56:58,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 18:56:58,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:58,386 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:58,388 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 18:56:58,388 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:58,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:58,388 INFO L82 PathProgramCache]: Analyzing trace with hash -1572648100, now seen corresponding path program 14 times [2020-08-21 18:56:58,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:58,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [578448847] [2020-08-21 18:56:58,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:58,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:58,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:58,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,705 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,889 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:58,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:58,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,059 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-21 18:56:59,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [578448847] [2020-08-21 18:56:59,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:56:59,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 18:56:59,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461833360] [2020-08-21 18:56:59,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 18:56:59,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:56:59,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 18:56:59,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2020-08-21 18:56:59,062 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2020-08-21 18:56:59,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:56:59,290 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-21 18:56:59,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 18:56:59,291 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-21 18:56:59,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:56:59,292 INFO L225 Difference]: With dead ends: 64 [2020-08-21 18:56:59,292 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 18:56:59,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 18:56:59,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 18:56:59,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 18:56:59,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 18:56:59,302 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-21 18:56:59,302 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-21 18:56:59,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:56:59,303 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-21 18:56:59,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 18:56:59,303 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-21 18:56:59,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 18:56:59,304 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:56:59,304 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:56:59,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 18:56:59,307 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:56:59,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:56:59,307 INFO L82 PathProgramCache]: Analyzing trace with hash 1584030916, now seen corresponding path program 15 times [2020-08-21 18:56:59,308 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:56:59,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [903522949] [2020-08-21 18:56:59,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:56:59,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:56:59,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:56:59,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,618 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,707 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:56:59,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:56:59,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,020 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-08-21 18:57:00,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [903522949] [2020-08-21 18:57:00,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:57:00,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 18:57:00,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19509231] [2020-08-21 18:57:00,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 18:57:00,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:00,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 18:57:00,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-08-21 18:57:00,029 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2020-08-21 18:57:00,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:00,330 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-08-21 18:57:00,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 18:57:00,331 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2020-08-21 18:57:00,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:00,332 INFO L225 Difference]: With dead ends: 67 [2020-08-21 18:57:00,332 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 18:57:00,335 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=461, Invalid=799, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 18:57:00,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 18:57:00,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-08-21 18:57:00,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 18:57:00,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-08-21 18:57:00,344 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2020-08-21 18:57:00,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:00,346 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-08-21 18:57:00,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 18:57:00,346 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-08-21 18:57:00,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 18:57:00,349 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:00,349 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:00,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 18:57:00,349 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:00,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:00,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1066046876, now seen corresponding path program 16 times [2020-08-21 18:57:00,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:00,350 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242523519] [2020-08-21 18:57:00,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:00,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:00,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:00,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,823 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:00,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:00,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,143 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-08-21 18:57:01,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242523519] [2020-08-21 18:57:01,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:57:01,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 18:57:01,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31059522] [2020-08-21 18:57:01,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 18:57:01,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:01,146 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 18:57:01,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2020-08-21 18:57:01,147 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2020-08-21 18:57:01,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:01,451 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2020-08-21 18:57:01,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 18:57:01,452 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2020-08-21 18:57:01,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:01,453 INFO L225 Difference]: With dead ends: 70 [2020-08-21 18:57:01,453 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 18:57:01,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 18:57:01,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 18:57:01,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-08-21 18:57:01,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 18:57:01,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2020-08-21 18:57:01,459 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2020-08-21 18:57:01,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:01,459 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2020-08-21 18:57:01,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 18:57:01,459 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2020-08-21 18:57:01,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-08-21 18:57:01,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:01,461 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:01,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 18:57:01,461 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:01,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:01,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1300351236, now seen corresponding path program 17 times [2020-08-21 18:57:01,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:01,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [869965981] [2020-08-21 18:57:01,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:01,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:01,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,502 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:01,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,891 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:01,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:01,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,296 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2020-08-21 18:57:02,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [869965981] [2020-08-21 18:57:02,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:57:02,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 18:57:02,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117221017] [2020-08-21 18:57:02,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 18:57:02,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:02,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 18:57:02,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-08-21 18:57:02,299 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2020-08-21 18:57:02,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:02,634 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2020-08-21 18:57:02,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 18:57:02,635 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2020-08-21 18:57:02,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:02,636 INFO L225 Difference]: With dead ends: 73 [2020-08-21 18:57:02,636 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 18:57:02,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=572, Invalid=988, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 18:57:02,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 18:57:02,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-08-21 18:57:02,650 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 18:57:02,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-08-21 18:57:02,651 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2020-08-21 18:57:02,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:02,652 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-08-21 18:57:02,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 18:57:02,652 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-08-21 18:57:02,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-08-21 18:57:02,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:02,654 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:02,654 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 18:57:02,654 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:02,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:02,654 INFO L82 PathProgramCache]: Analyzing trace with hash 227065820, now seen corresponding path program 18 times [2020-08-21 18:57:02,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:02,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1799182433] [2020-08-21 18:57:02,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:02,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:02,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,719 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:02,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:02,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:02,991 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,229 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,311 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:03,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,604 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2020-08-21 18:57:03,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1799182433] [2020-08-21 18:57:03,605 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:57:03,605 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 18:57:03,605 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220127780] [2020-08-21 18:57:03,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 18:57:03,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:03,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 18:57:03,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=292, Unknown=0, NotChecked=0, Total=506 [2020-08-21 18:57:03,609 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2020-08-21 18:57:03,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:03,880 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2020-08-21 18:57:03,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 18:57:03,881 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2020-08-21 18:57:03,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:03,882 INFO L225 Difference]: With dead ends: 76 [2020-08-21 18:57:03,882 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 18:57:03,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=632, Invalid=1090, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 18:57:03,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 18:57:03,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-08-21 18:57:03,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 18:57:03,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2020-08-21 18:57:03,894 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2020-08-21 18:57:03,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:03,894 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2020-08-21 18:57:03,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 18:57:03,895 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2020-08-21 18:57:03,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-08-21 18:57:03,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:03,897 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:03,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 18:57:03,897 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:03,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:03,897 INFO L82 PathProgramCache]: Analyzing trace with hash -479687356, now seen corresponding path program 19 times [2020-08-21 18:57:03,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:03,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1504513815] [2020-08-21 18:57:03,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:03,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 18:57:03,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:03,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 18:57:03,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,241 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,274 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,556 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 18:57:04,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 18:57:04,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-08-21 18:57:04,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1504513815] [2020-08-21 18:57:04,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 18:57:04,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 18:57:04,789 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115221681] [2020-08-21 18:57:04,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 18:57:04,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 18:57:04,790 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 18:57:04,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-08-21 18:57:04,791 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2020-08-21 18:57:05,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 18:57:05,185 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2020-08-21 18:57:05,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 18:57:05,185 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2020-08-21 18:57:05,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 18:57:05,186 INFO L225 Difference]: With dead ends: 79 [2020-08-21 18:57:05,187 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 18:57:05,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=695, Invalid=1197, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 18:57:05,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 18:57:05,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-08-21 18:57:05,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 18:57:05,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2020-08-21 18:57:05,193 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2020-08-21 18:57:05,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 18:57:05,194 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2020-08-21 18:57:05,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 18:57:05,194 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2020-08-21 18:57:05,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-08-21 18:57:05,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 18:57:05,197 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 18:57:05,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 18:57:05,197 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 18:57:05,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 18:57:05,198 INFO L82 PathProgramCache]: Analyzing trace with hash -1598174692, now seen corresponding path program 20 times [2020-08-21 18:57:05,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 18:57:05,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520700732] [2020-08-21 18:57:05,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 18:57:05,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 18:57:05,261 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 18:57:05,261 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 18:57:05,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 18:57:05,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 06:57:05 BoogieIcfgContainer [2020-08-21 18:57:05,295 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 18:57:05,298 INFO L168 Benchmark]: Toolchain (without parser) took 14199.06 ms. Allocated memory was 136.8 MB in the beginning and 514.3 MB in the end (delta: 377.5 MB). Free memory was 99.8 MB in the beginning and 472.0 MB in the end (delta: -372.1 MB). Peak memory consumption was 356.2 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:05,299 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 136.8 MB. Free memory was 118.4 MB in the beginning and 118.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 18:57:05,299 INFO L168 Benchmark]: CACSL2BoogieTranslator took 234.57 ms. Allocated memory is still 136.8 MB. Free memory was 99.6 MB in the beginning and 90.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:05,300 INFO L168 Benchmark]: Boogie Preprocessor took 24.47 ms. Allocated memory is still 136.8 MB. Free memory was 90.3 MB in the beginning and 89.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:05,301 INFO L168 Benchmark]: RCFGBuilder took 331.56 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 89.0 MB in the beginning and 168.9 MB in the end (delta: -79.9 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:05,301 INFO L168 Benchmark]: TraceAbstraction took 13602.14 ms. Allocated memory was 200.8 MB in the beginning and 514.3 MB in the end (delta: 313.5 MB). Free memory was 168.2 MB in the beginning and 472.0 MB in the end (delta: -303.7 MB). Peak memory consumption was 360.6 MB. Max. memory is 7.1 GB. [2020-08-21 18:57:05,304 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 136.8 MB. Free memory was 118.4 MB in the beginning and 118.2 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 234.57 ms. Allocated memory is still 136.8 MB. Free memory was 99.6 MB in the beginning and 90.3 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 24.47 ms. Allocated memory is still 136.8 MB. Free memory was 90.3 MB in the beginning and 89.0 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 331.56 ms. Allocated memory was 136.8 MB in the beginning and 200.8 MB in the end (delta: 64.0 MB). Free memory was 89.0 MB in the beginning and 168.9 MB in the end (delta: -79.9 MB). Peak memory consumption was 12.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 13602.14 ms. Allocated memory was 200.8 MB in the beginning and 514.3 MB in the end (delta: 313.5 MB). Free memory was 168.2 MB in the beginning and 472.0 MB in the end (delta: -303.7 MB). Peak memory consumption was 360.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 16]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L12] int a = 20; [L13] int b = 0; [L14] CALL, EXPR sum(a, b) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND FALSE !(n <= 0) [L7] CALL, EXPR sum(n - 1, m + 1) [L4] COND TRUE n <= 0 [L5] return m + n; [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L7] RET, EXPR sum(n - 1, m + 1) [L7] return sum(n - 1, m + 1); [L14] RET, EXPR sum(a, b) [L14] int result = sum(a, b); [L15] COND TRUE result == a + b [L16] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 13.5s, OverallIterations: 21, TraceHistogramMax: 21, AutomataDifference: 3.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 243 SDtfs, 523 SDslu, 1120 SDs, 0 SdLazy, 809 SolverSat, 47 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 940 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 460 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2470 ImplicationChecksByTransitivity, 5.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=20, 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, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 8.6s InterpolantComputationTime, 1533 NumberOfCodeBlocks, 1533 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 1380 ConstructedInterpolants, 0 QuantifiedInterpolants, 301200 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 20 InterpolantComputations, 1 PerfectInterpolantSequences, 3800/7600 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...