/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 log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 14:14:25,688 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 14:14:25,690 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 14:14:25,714 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 14:14:25,715 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 14:14:25,716 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 14:14:25,717 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 14:14:25,719 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 14:14:25,721 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 14:14:25,722 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 14:14:25,723 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 14:14:25,724 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 14:14:25,724 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 14:14:25,725 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 14:14:25,728 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 14:14:25,729 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 14:14:25,730 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 14:14:25,731 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 14:14:25,733 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 14:14:25,735 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 14:14:25,736 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 14:14:25,738 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 14:14:25,739 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 14:14:25,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 14:14:25,742 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 14:14:25,743 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 14:14:25,743 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 14:14:25,744 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 14:14:25,744 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 14:14:25,745 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 14:14:25,745 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 14:14:25,746 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 14:14:25,747 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 14:14:25,747 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 14:14:25,748 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 14:14:25,749 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 14:14:25,749 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 14:14:25,749 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 14:14:25,750 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 14:14:25,751 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 14:14:25,751 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 14:14:25,752 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 14:14:25,775 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 14:14:25,775 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 14:14:25,777 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 14:14:25,777 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 14:14:25,777 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 14:14:25,777 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 14:14:25,778 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 14:14:25,778 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 14:14:25,778 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 14:14:25,778 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 14:14:25,778 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 14:14:25,778 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 14:14:25,779 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 14:14:25,779 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 14:14:25,779 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 14:14:25,779 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 14:14:25,779 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 14:14:25,780 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 14:14:25,780 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 14:14:25,780 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 14:14:25,780 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 14:14:25,780 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:14:25,781 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 14:14:25,781 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 14:14:25,781 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 14:14:25,781 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 14:14:25,781 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 14:14:25,782 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 14:14:25,782 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 14:14:25,782 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 -> log-additional-information=true; [2020-08-21 14:14:26,125 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 14:14:26,136 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 14:14:26,140 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 14:14:26,141 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 14:14:26,142 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 14:14:26,143 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 14:14:26,204 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e8f81a101/e851cc24ccbb4bb0af6e347172c1c23e/FLAGc88c2c0b0 [2020-08-21 14:14:26,725 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 14:14:26,725 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 14:14:26,732 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e8f81a101/e851cc24ccbb4bb0af6e347172c1c23e/FLAGc88c2c0b0 [2020-08-21 14:14:27,104 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e8f81a101/e851cc24ccbb4bb0af6e347172c1c23e [2020-08-21 14:14:27,112 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 14:14:27,114 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 14:14:27,115 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:27,115 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 14:14:27,121 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 14:14:27,122 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,124 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@20abf48c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27, skipping insertion in model container [2020-08-21 14:14:27,125 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,134 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 14:14:27,155 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 14:14:27,346 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:27,390 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 14:14:27,409 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 14:14:27,556 INFO L208 MainTranslator]: Completed translation [2020-08-21 14:14:27,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27 WrapperNode [2020-08-21 14:14:27,557 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 14:14:27,558 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 14:14:27,558 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 14:14:27,558 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 14:14:27,572 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,572 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,580 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,581 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,588 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,593 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,594 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... [2020-08-21 14:14:27,596 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 14:14:27,597 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 14:14:27,597 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 14:14:27,597 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 14:14:27,598 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 14:14:27,656 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 14:14:27,656 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 14:14:27,656 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 14:14:27,656 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 14:14:27,656 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 14:14:27,657 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 14:14:27,657 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 14:14:27,657 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 14:14:27,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 14:14:27,657 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-21 14:14:27,657 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 14:14:27,658 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 14:14:27,890 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 14:14:27,891 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 14:14:27,895 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:27 BoogieIcfgContainer [2020-08-21 14:14:27,895 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 14:14:27,897 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 14:14:27,897 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 14:14:27,900 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 14:14:27,900 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 02:14:27" (1/3) ... [2020-08-21 14:14:27,901 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77b40689 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:27, skipping insertion in model container [2020-08-21 14:14:27,901 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 02:14:27" (2/3) ... [2020-08-21 14:14:27,902 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@77b40689 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 02:14:27, skipping insertion in model container [2020-08-21 14:14:27,902 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 02:14:27" (3/3) ... [2020-08-21 14:14:27,903 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-21 14:14:27,914 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 14:14:27,924 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 14:14:27,947 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 14:14:27,979 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 14:14:27,979 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 14:14:27,979 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 14:14:27,980 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 14:14:27,980 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 14:14:27,980 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 14:14:27,980 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 14:14:27,981 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 14:14:28,001 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 14:14:28,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 14:14:28,009 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,010 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,010 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,017 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-21 14:14:28,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,027 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199085882] [2020-08-21 14:14:28,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:28,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,274 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 14:14:28,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199085882] [2020-08-21 14:14:28,277 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:28,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 14:14:28,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000483824] [2020-08-21 14:14:28,282 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 14:14:28,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:28,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 14:14:28,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 14:14:28,296 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-21 14:14:28,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:28,394 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-21 14:14:28,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 14:14:28,396 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-21 14:14:28,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:28,406 INFO L225 Difference]: With dead ends: 42 [2020-08-21 14:14:28,406 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 14:14:28,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 14:14:28,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 14:14:28,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-21 14:14:28,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 14:14:28,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 14:14:28,447 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-21 14:14:28,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:28,447 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 14:14:28,447 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 14:14:28,448 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 14:14:28,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 14:14:28,448 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,449 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,449 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 14:14:28,449 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,450 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-21 14:14:28,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2036202995] [2020-08-21 14:14:28,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:28,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,580 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 14:14:28,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2036202995] [2020-08-21 14:14:28,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:28,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 14:14:28,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006698055] [2020-08-21 14:14:28,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:14:28,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:28,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:14:28,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:14:28,583 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-21 14:14:28,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:28,697 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-21 14:14:28,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:14:28,697 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-21 14:14:28,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:28,699 INFO L225 Difference]: With dead ends: 36 [2020-08-21 14:14:28,699 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 14:14:28,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:28,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 14:14:28,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-21 14:14:28,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 14:14:28,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 14:14:28,707 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-21 14:14:28,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:28,708 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 14:14:28,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:14:28,708 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 14:14:28,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 14:14:28,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,709 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 14:14:28,710 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,710 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-21 14:14:28,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278879554] [2020-08-21 14:14:28,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,771 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:28,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:28,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:28,783 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278879554] [2020-08-21 14:14:28,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:28,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 14:14:28,784 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982123184] [2020-08-21 14:14:28,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:14:28,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:28,785 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:14:28,785 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:14:28,785 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-21 14:14:28,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:28,896 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-21 14:14:28,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:14:28,896 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 14:14:28,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:28,898 INFO L225 Difference]: With dead ends: 40 [2020-08-21 14:14:28,898 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 14:14:28,899 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:28,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 14:14:28,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-21 14:14:28,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 14:14:28,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 14:14:28,906 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-21 14:14:28,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:28,906 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 14:14:28,906 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:14:28,907 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 14:14:28,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 14:14:28,907 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:28,908 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:28,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 14:14:28,908 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:28,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:28,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-21 14:14:28,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:28,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394698428] [2020-08-21 14:14:28,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:28,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:29,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,014 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:29,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394698428] [2020-08-21 14:14:29,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 14:14:29,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 14:14:29,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085316037] [2020-08-21 14:14:29,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 14:14:29,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:29,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 14:14:29,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 14:14:29,017 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-21 14:14:29,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:29,096 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-21 14:14:29,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 14:14:29,097 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-21 14:14:29,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:29,098 INFO L225 Difference]: With dead ends: 31 [2020-08-21 14:14:29,098 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 14:14:29,099 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:29,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 14:14:29,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-21 14:14:29,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 14:14:29,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 14:14:29,105 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-21 14:14:29,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:29,106 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 14:14:29,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 14:14:29,106 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 14:14:29,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 14:14:29,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:29,107 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:29,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 14:14:29,108 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:29,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:29,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-21 14:14:29,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:29,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058531501] [2020-08-21 14:14:29,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:29,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:29,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,243 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:29,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058531501] [2020-08-21 14:14:29,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:29,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 14:14:29,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556632864] [2020-08-21 14:14:29,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 14:14:29,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:29,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 14:14:29,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 14:14:29,250 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-21 14:14:29,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:29,353 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-21 14:14:29,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 14:14:29,354 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 14:14:29,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:29,355 INFO L225 Difference]: With dead ends: 34 [2020-08-21 14:14:29,355 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 14:14:29,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:14:29,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 14:14:29,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-21 14:14:29,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 14:14:29,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 14:14:29,362 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-21 14:14:29,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:29,363 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 14:14:29,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 14:14:29,363 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 14:14:29,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 14:14:29,364 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:29,365 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 14:14:29,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 14:14:29,365 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:29,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:29,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-21 14:14:29,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:29,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114777945] [2020-08-21 14:14:29,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:29,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:29,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,529 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:29,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114777945] [2020-08-21 14:14:29,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:29,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 14:14:29,531 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053193179] [2020-08-21 14:14:29,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 14:14:29,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:29,532 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 14:14:29,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 14:14:29,532 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-21 14:14:29,610 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:29,610 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-21 14:14:29,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 14:14:29,611 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 14:14:29,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:29,612 INFO L225 Difference]: With dead ends: 38 [2020-08-21 14:14:29,612 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 14:14:29,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:14:29,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 14:14:29,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-21 14:14:29,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 14:14:29,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-21 14:14:29,618 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-21 14:14:29,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:29,619 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-21 14:14:29,619 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 14:14:29,619 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-21 14:14:29,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 14:14:29,620 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:29,620 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:29,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 14:14:29,621 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:29,621 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:29,621 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-21 14:14:29,621 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:29,622 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853866329] [2020-08-21 14:14:29,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:29,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:29,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:29,812 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:29,812 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853866329] [2020-08-21 14:14:29,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:29,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 14:14:29,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308802406] [2020-08-21 14:14:29,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 14:14:29,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:29,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 14:14:29,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 14:14:29,816 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-21 14:14:29,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:29,932 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-21 14:14:29,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 14:14:29,933 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-21 14:14:29,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:29,934 INFO L225 Difference]: With dead ends: 42 [2020-08-21 14:14:29,934 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 14:14:29,935 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:14:29,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 14:14:29,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-21 14:14:29,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 14:14:29,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 14:14:29,947 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-21 14:14:29,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:29,947 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 14:14:29,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 14:14:29,948 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 14:14:29,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 14:14:29,948 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:29,949 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:29,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 14:14:29,952 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:29,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:29,952 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-21 14:14:29,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:29,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [13631322] [2020-08-21 14:14:29,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:29,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:30,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,134 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:30,134 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [13631322] [2020-08-21 14:14:30,134 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:30,135 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 14:14:30,135 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526578951] [2020-08-21 14:14:30,136 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 14:14:30,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:30,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 14:14:30,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 14:14:30,139 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-21 14:14:30,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:30,260 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-21 14:14:30,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 14:14:30,261 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-21 14:14:30,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:30,262 INFO L225 Difference]: With dead ends: 46 [2020-08-21 14:14:30,262 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 14:14:30,263 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:14:30,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 14:14:30,267 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-21 14:14:30,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 14:14:30,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 14:14:30,268 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-21 14:14:30,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:30,269 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 14:14:30,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 14:14:30,269 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 14:14:30,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 14:14:30,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:30,270 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:30,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 14:14:30,271 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:30,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:30,271 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-21 14:14:30,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:30,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216383043] [2020-08-21 14:14:30,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:30,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:30,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,406 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:30,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216383043] [2020-08-21 14:14:30,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:30,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 14:14:30,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224929571] [2020-08-21 14:14:30,407 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 14:14:30,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:30,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 14:14:30,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 14:14:30,408 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-21 14:14:30,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:30,560 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 14:14:30,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 14:14:30,561 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-21 14:14:30,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:30,562 INFO L225 Difference]: With dead ends: 50 [2020-08-21 14:14:30,562 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 14:14:30,563 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:14:30,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 14:14:30,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 14:14:30,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 14:14:30,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-21 14:14:30,569 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-21 14:14:30,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:30,570 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-21 14:14:30,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 14:14:30,570 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-21 14:14:30,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 14:14:30,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:30,571 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:30,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 14:14:30,572 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:30,572 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:30,572 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-21 14:14:30,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:30,573 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024790259] [2020-08-21 14:14:30,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:30,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:30,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:30,744 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:30,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024790259] [2020-08-21 14:14:30,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:30,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 14:14:30,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1716281315] [2020-08-21 14:14:30,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 14:14:30,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:30,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 14:14:30,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-21 14:14:30,747 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-21 14:14:30,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:30,941 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-21 14:14:30,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 14:14:30,942 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 14:14:30,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:30,943 INFO L225 Difference]: With dead ends: 54 [2020-08-21 14:14:30,943 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 14:14:30,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:14:30,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 14:14:30,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-21 14:14:30,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 14:14:30,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 14:14:30,949 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-21 14:14:30,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:30,950 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 14:14:30,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 14:14:30,950 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 14:14:30,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 14:14:30,951 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:30,951 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:30,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 14:14:30,952 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:30,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:30,952 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-21 14:14:30,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:30,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1728711081] [2020-08-21 14:14:30,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:30,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:31,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:31,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:31,122 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:31,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1728711081] [2020-08-21 14:14:31,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:31,123 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 14:14:31,123 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644941958] [2020-08-21 14:14:31,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 14:14:31,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:31,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 14:14:31,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-21 14:14:31,124 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-21 14:14:31,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:31,319 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-21 14:14:31,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 14:14:31,319 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-21 14:14:31,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:31,320 INFO L225 Difference]: With dead ends: 58 [2020-08-21 14:14:31,320 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 14:14:31,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:14:31,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 14:14:31,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-21 14:14:31,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 14:14:31,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-21 14:14:31,327 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-21 14:14:31,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:31,327 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-21 14:14:31,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 14:14:31,327 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-21 14:14:31,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 14:14:31,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:31,328 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:31,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 14:14:31,329 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:31,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:31,329 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-21 14:14:31,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:31,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [877153292] [2020-08-21 14:14:31,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:31,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:31,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:31,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:31,581 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:31,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [877153292] [2020-08-21 14:14:31,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:31,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 14:14:31,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1275354539] [2020-08-21 14:14:31,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 14:14:31,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:31,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 14:14:31,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 14:14:31,584 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-21 14:14:31,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:31,813 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-21 14:14:31,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 14:14:31,813 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-21 14:14:31,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:31,814 INFO L225 Difference]: With dead ends: 62 [2020-08-21 14:14:31,815 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 14:14:31,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:14:31,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 14:14:31,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-21 14:14:31,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 14:14:31,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-21 14:14:31,828 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-21 14:14:31,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:31,829 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-21 14:14:31,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 14:14:31,829 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-21 14:14:31,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 14:14:31,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:31,832 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:31,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 14:14:31,833 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:31,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:31,833 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-21 14:14:31,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:31,834 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800125131] [2020-08-21 14:14:31,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:31,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:32,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,113 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:32,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800125131] [2020-08-21 14:14:32,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:32,115 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 14:14:32,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1707149945] [2020-08-21 14:14:32,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 14:14:32,117 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:32,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 14:14:32,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-21 14:14:32,123 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-21 14:14:32,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:32,395 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-21 14:14:32,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 14:14:32,396 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-21 14:14:32,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:32,397 INFO L225 Difference]: With dead ends: 66 [2020-08-21 14:14:32,397 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 14:14:32,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 14:14:32,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 14:14:32,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-21 14:14:32,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 14:14:32,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 14:14:32,410 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-21 14:14:32,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:32,410 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 14:14:32,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 14:14:32,410 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 14:14:32,413 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 14:14:32,413 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:32,413 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:32,413 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 14:14:32,414 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:32,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:32,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-21 14:14:32,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:32,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357013380] [2020-08-21 14:14:32,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:32,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:32,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:32,681 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:32,682 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357013380] [2020-08-21 14:14:32,682 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:32,682 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 14:14:32,683 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207538145] [2020-08-21 14:14:32,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 14:14:32,683 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:32,683 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 14:14:32,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-21 14:14:32,684 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-21 14:14:32,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:32,988 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-21 14:14:32,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 14:14:32,989 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-21 14:14:32,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:32,990 INFO L225 Difference]: With dead ends: 70 [2020-08-21 14:14:32,990 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 14:14:32,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:14:32,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 14:14:33,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-21 14:14:33,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 14:14:33,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-21 14:14:33,003 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-21 14:14:33,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:33,003 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-21 14:14:33,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 14:14:33,003 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-21 14:14:33,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 14:14:33,004 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:33,004 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:33,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 14:14:33,005 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:33,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:33,005 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-21 14:14:33,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:33,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839260686] [2020-08-21 14:14:33,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:33,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:33,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:33,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839260686] [2020-08-21 14:14:33,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:33,244 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 14:14:33,244 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1516605226] [2020-08-21 14:14:33,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 14:14:33,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:33,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 14:14:33,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-21 14:14:33,245 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-21 14:14:33,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:33,579 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-21 14:14:33,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 14:14:33,579 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 14:14:33,580 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:33,580 INFO L225 Difference]: With dead ends: 74 [2020-08-21 14:14:33,580 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 14:14:33,581 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:14:33,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 14:14:33,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-21 14:14:33,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 14:14:33,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-21 14:14:33,588 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-21 14:14:33,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:33,588 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-21 14:14:33,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 14:14:33,589 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-21 14:14:33,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 14:14:33,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:33,590 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:33,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 14:14:33,590 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:33,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:33,591 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-21 14:14:33,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:33,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602708050] [2020-08-21 14:14:33,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:33,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:33,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:33,883 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:33,883 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602708050] [2020-08-21 14:14:33,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:33,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 14:14:33,884 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [687670812] [2020-08-21 14:14:33,884 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 14:14:33,885 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:33,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 14:14:33,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-21 14:14:33,885 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-21 14:14:34,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:34,257 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-21 14:14:34,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 14:14:34,257 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-21 14:14:34,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:34,258 INFO L225 Difference]: With dead ends: 78 [2020-08-21 14:14:34,258 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 14:14:34,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:14:34,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 14:14:34,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-21 14:14:34,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 14:14:34,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-21 14:14:34,266 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-21 14:14:34,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:34,266 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-21 14:14:34,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 14:14:34,266 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-21 14:14:34,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 14:14:34,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:34,267 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:34,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 14:14:34,267 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:34,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:34,268 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-21 14:14:34,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:34,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1669187513] [2020-08-21 14:14:34,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:34,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:34,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:34,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:34,562 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:34,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1669187513] [2020-08-21 14:14:34,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:34,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 14:14:34,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515571735] [2020-08-21 14:14:34,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 14:14:34,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:34,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 14:14:34,565 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-21 14:14:34,565 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-21 14:14:34,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:34,977 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-21 14:14:34,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 14:14:34,978 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-21 14:14:34,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:34,978 INFO L225 Difference]: With dead ends: 82 [2020-08-21 14:14:34,978 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 14:14:34,979 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:14:34,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 14:14:34,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-21 14:14:34,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 14:14:34,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-21 14:14:34,985 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-21 14:14:34,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:34,985 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-21 14:14:34,985 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 14:14:34,986 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-21 14:14:34,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 14:14:34,986 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:34,987 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:34,987 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 14:14:34,987 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:34,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:34,987 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-21 14:14:34,988 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:34,988 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174206068] [2020-08-21 14:14:34,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:35,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:35,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:35,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:35,305 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:35,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174206068] [2020-08-21 14:14:35,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:35,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 14:14:35,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596730954] [2020-08-21 14:14:35,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 14:14:35,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:35,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 14:14:35,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-21 14:14:35,313 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-21 14:14:35,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:35,811 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-21 14:14:35,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 14:14:35,812 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-21 14:14:35,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:35,812 INFO L225 Difference]: With dead ends: 86 [2020-08-21 14:14:35,813 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 14:14:35,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-21 14:14:35,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 14:14:35,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-21 14:14:35,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 14:14:35,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-21 14:14:35,823 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-21 14:14:35,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:35,825 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-21 14:14:35,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 14:14:35,826 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-21 14:14:35,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 14:14:35,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:35,827 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:35,827 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 14:14:35,828 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:35,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:35,828 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-21 14:14:35,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:35,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506996036] [2020-08-21 14:14:35,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:35,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:36,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:36,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:36,208 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:36,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506996036] [2020-08-21 14:14:36,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:36,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 14:14:36,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140996229] [2020-08-21 14:14:36,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 14:14:36,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:36,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 14:14:36,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-21 14:14:36,210 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-21 14:14:36,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:36,809 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-21 14:14:36,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 14:14:36,809 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-21 14:14:36,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:36,810 INFO L225 Difference]: With dead ends: 90 [2020-08-21 14:14:36,810 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 14:14:36,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:14:36,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 14:14:36,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-21 14:14:36,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 14:14:36,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-21 14:14:36,816 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-21 14:14:36,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:36,816 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-21 14:14:36,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 14:14:36,816 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-21 14:14:36,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 14:14:36,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:36,817 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:36,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 14:14:36,817 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:36,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:36,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-21 14:14:36,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:36,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [583696876] [2020-08-21 14:14:36,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:36,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:37,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:37,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:37,171 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:37,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [583696876] [2020-08-21 14:14:37,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:37,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 14:14:37,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1391665003] [2020-08-21 14:14:37,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 14:14:37,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:37,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 14:14:37,173 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-21 14:14:37,174 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-21 14:14:37,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:37,818 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-21 14:14:37,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 14:14:37,818 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-21 14:14:37,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:37,819 INFO L225 Difference]: With dead ends: 94 [2020-08-21 14:14:37,819 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 14:14:37,820 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:14:37,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 14:14:37,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-21 14:14:37,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 14:14:37,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-21 14:14:37,826 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-21 14:14:37,826 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:37,826 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-21 14:14:37,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 14:14:37,827 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-21 14:14:37,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 14:14:37,827 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:37,828 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:37,828 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 14:14:37,828 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:37,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:37,829 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-21 14:14:37,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:37,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950022568] [2020-08-21 14:14:37,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:37,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:38,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:38,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:38,246 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:38,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950022568] [2020-08-21 14:14:38,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:38,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 14:14:38,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1179905326] [2020-08-21 14:14:38,247 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 14:14:38,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:38,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 14:14:38,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-21 14:14:38,248 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-21 14:14:38,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:38,837 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-21 14:14:38,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 14:14:38,838 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-21 14:14:38,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:38,839 INFO L225 Difference]: With dead ends: 98 [2020-08-21 14:14:38,839 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 14:14:38,840 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:14:38,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 14:14:38,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-21 14:14:38,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 14:14:38,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-21 14:14:38,845 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-21 14:14:38,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:38,846 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-21 14:14:38,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 14:14:38,846 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-21 14:14:38,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 14:14:38,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:38,847 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:38,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 14:14:38,847 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:38,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:38,848 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-21 14:14:38,848 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:38,848 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475285919] [2020-08-21 14:14:38,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:38,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:39,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:39,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:39,289 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:39,289 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475285919] [2020-08-21 14:14:39,289 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:39,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 14:14:39,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360347831] [2020-08-21 14:14:39,290 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 14:14:39,290 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:39,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 14:14:39,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-21 14:14:39,291 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-21 14:14:40,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:40,126 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-21 14:14:40,131 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 14:14:40,131 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-21 14:14:40,132 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:40,132 INFO L225 Difference]: With dead ends: 102 [2020-08-21 14:14:40,133 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 14:14:40,133 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-21 14:14:40,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 14:14:40,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-21 14:14:40,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 14:14:40,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-21 14:14:40,143 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-21 14:14:40,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:40,144 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-21 14:14:40,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 14:14:40,144 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-21 14:14:40,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 14:14:40,144 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:40,145 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:40,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 14:14:40,145 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:40,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:40,145 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-21 14:14:40,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:40,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [424582108] [2020-08-21 14:14:40,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:40,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:40,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:40,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:40,602 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:40,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [424582108] [2020-08-21 14:14:40,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:40,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 14:14:40,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092710017] [2020-08-21 14:14:40,603 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 14:14:40,603 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:40,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 14:14:40,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-21 14:14:40,604 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-21 14:14:41,381 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:41,382 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-21 14:14:41,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 14:14:41,387 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-21 14:14:41,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:41,388 INFO L225 Difference]: With dead ends: 106 [2020-08-21 14:14:41,388 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 14:14:41,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:14:41,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 14:14:41,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-21 14:14:41,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 14:14:41,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-21 14:14:41,394 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-21 14:14:41,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:41,394 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-21 14:14:41,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 14:14:41,395 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-21 14:14:41,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 14:14:41,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:41,395 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:41,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 14:14:41,396 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:41,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:41,396 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-21 14:14:41,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:41,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [734881640] [2020-08-21 14:14:41,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:41,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:41,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:41,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:41,917 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:41,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [734881640] [2020-08-21 14:14:41,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:41,918 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 14:14:41,918 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242133042] [2020-08-21 14:14:41,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 14:14:41,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:41,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 14:14:41,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-21 14:14:41,920 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-21 14:14:42,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:42,714 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-21 14:14:42,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 14:14:42,716 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-21 14:14:42,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:42,717 INFO L225 Difference]: With dead ends: 110 [2020-08-21 14:14:42,717 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 14:14:42,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-21 14:14:42,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 14:14:42,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-21 14:14:42,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 14:14:42,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-21 14:14:42,723 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-21 14:14:42,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:42,723 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-21 14:14:42,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 14:14:42,724 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-21 14:14:42,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 14:14:42,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:42,724 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:42,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 14:14:42,725 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:42,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:42,725 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-21 14:14:42,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:42,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1289815478] [2020-08-21 14:14:42,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:42,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:43,246 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:43,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:43,257 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:43,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1289815478] [2020-08-21 14:14:43,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:43,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 14:14:43,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508320307] [2020-08-21 14:14:43,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 14:14:43,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:43,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 14:14:43,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-21 14:14:43,259 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-21 14:14:44,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:44,052 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-21 14:14:44,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 14:14:44,053 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-21 14:14:44,053 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:44,054 INFO L225 Difference]: With dead ends: 114 [2020-08-21 14:14:44,054 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 14:14:44,054 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-21 14:14:44,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 14:14:44,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-21 14:14:44,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 14:14:44,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-21 14:14:44,058 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-21 14:14:44,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:44,059 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-21 14:14:44,059 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 14:14:44,059 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-21 14:14:44,059 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 14:14:44,060 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:44,060 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:44,060 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 14:14:44,060 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:44,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:44,060 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-21 14:14:44,061 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:44,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932360265] [2020-08-21 14:14:44,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:44,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:44,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:44,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:44,643 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:44,643 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932360265] [2020-08-21 14:14:44,644 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:44,644 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 14:14:44,644 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906350263] [2020-08-21 14:14:44,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 14:14:44,644 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:44,645 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 14:14:44,645 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-21 14:14:44,645 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-21 14:14:45,564 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:45,565 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-21 14:14:45,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 14:14:45,567 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-21 14:14:45,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:45,568 INFO L225 Difference]: With dead ends: 118 [2020-08-21 14:14:45,568 INFO L226 Difference]: Without dead ends: 65 [2020-08-21 14:14:45,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:14:45,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-21 14:14:45,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-21 14:14:45,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-21 14:14:45,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-21 14:14:45,574 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-21 14:14:45,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:45,574 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-21 14:14:45,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 14:14:45,574 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-21 14:14:45,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 14:14:45,575 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:45,575 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:45,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 14:14:45,575 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:45,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:45,576 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-21 14:14:45,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:45,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [479196417] [2020-08-21 14:14:45,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:45,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:46,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:46,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:46,161 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:46,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [479196417] [2020-08-21 14:14:46,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:46,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 14:14:46,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796353229] [2020-08-21 14:14:46,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 14:14:46,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:46,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 14:14:46,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-21 14:14:46,163 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-21 14:14:47,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:47,224 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-21 14:14:47,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 14:14:47,227 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-21 14:14:47,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:47,228 INFO L225 Difference]: With dead ends: 122 [2020-08-21 14:14:47,228 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 14:14:47,229 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:14:47,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 14:14:47,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-21 14:14:47,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 14:14:47,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-21 14:14:47,234 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-21 14:14:47,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:47,234 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-21 14:14:47,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 14:14:47,234 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-21 14:14:47,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 14:14:47,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:47,235 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:47,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 14:14:47,235 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:47,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:47,236 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-21 14:14:47,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:47,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262990717] [2020-08-21 14:14:47,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:47,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:47,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:47,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:47,934 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:47,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262990717] [2020-08-21 14:14:47,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:47,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 14:14:47,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024858987] [2020-08-21 14:14:47,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 14:14:47,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:47,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 14:14:47,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-21 14:14:47,937 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-21 14:14:49,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:49,038 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-21 14:14:49,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 14:14:49,042 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-21 14:14:49,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:49,043 INFO L225 Difference]: With dead ends: 126 [2020-08-21 14:14:49,043 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 14:14:49,044 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:14:49,044 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 14:14:49,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-21 14:14:49,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 14:14:49,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-21 14:14:49,049 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-21 14:14:49,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:49,049 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-21 14:14:49,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 14:14:49,049 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-21 14:14:49,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-21 14:14:49,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:49,050 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:49,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 14:14:49,050 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:49,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:49,051 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-21 14:14:49,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:49,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [91726391] [2020-08-21 14:14:49,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:49,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:49,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:49,751 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:49,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [91726391] [2020-08-21 14:14:49,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:49,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 14:14:49,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780346181] [2020-08-21 14:14:49,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 14:14:49,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:49,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 14:14:49,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-21 14:14:49,753 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-21 14:14:50,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:50,931 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-21 14:14:50,935 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 14:14:50,935 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-21 14:14:50,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:50,936 INFO L225 Difference]: With dead ends: 130 [2020-08-21 14:14:50,936 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 14:14:50,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-21 14:14:50,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 14:14:50,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-21 14:14:50,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-21 14:14:50,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-21 14:14:50,941 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-21 14:14:50,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:50,942 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-21 14:14:50,942 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 14:14:50,942 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-21 14:14:50,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 14:14:50,942 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:50,943 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:50,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 14:14:50,943 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:50,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:50,943 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-21 14:14:50,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:50,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [15105589] [2020-08-21 14:14:50,944 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:50,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:51,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:51,735 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:51,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [15105589] [2020-08-21 14:14:51,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:51,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 14:14:51,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1839060761] [2020-08-21 14:14:51,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 14:14:51,737 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:51,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 14:14:51,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-21 14:14:51,738 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-21 14:14:53,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:53,060 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-21 14:14:53,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 14:14:53,063 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-21 14:14:53,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:53,063 INFO L225 Difference]: With dead ends: 134 [2020-08-21 14:14:53,064 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 14:14:53,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:14:53,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 14:14:53,069 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-21 14:14:53,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 14:14:53,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-21 14:14:53,070 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-21 14:14:53,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:53,071 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-21 14:14:53,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 14:14:53,071 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-21 14:14:53,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 14:14:53,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:53,072 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:53,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 14:14:53,072 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:53,072 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:53,072 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-21 14:14:53,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:53,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1873129806] [2020-08-21 14:14:53,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:53,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:53,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:53,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:53,944 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:53,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1873129806] [2020-08-21 14:14:53,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:53,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 14:14:53,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [4829078] [2020-08-21 14:14:53,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 14:14:53,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:53,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 14:14:53,947 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-21 14:14:53,947 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-21 14:14:55,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:55,282 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-21 14:14:55,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 14:14:55,282 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-21 14:14:55,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:55,283 INFO L225 Difference]: With dead ends: 138 [2020-08-21 14:14:55,283 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 14:14:55,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:14:55,284 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 14:14:55,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-21 14:14:55,289 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 14:14:55,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-21 14:14:55,289 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-21 14:14:55,290 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:55,290 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-21 14:14:55,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 14:14:55,290 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-21 14:14:55,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-21 14:14:55,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:55,291 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:55,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 14:14:55,291 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:55,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:55,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-21 14:14:55,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:55,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [961676507] [2020-08-21 14:14:55,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:55,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:56,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:56,116 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:56,117 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [961676507] [2020-08-21 14:14:56,117 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:56,117 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 14:14:56,117 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1522936074] [2020-08-21 14:14:56,118 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 14:14:56,118 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:56,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 14:14:56,119 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-21 14:14:56,119 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-21 14:14:57,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:14:57,633 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-21 14:14:57,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 14:14:57,634 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-21 14:14:57,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:14:57,635 INFO L225 Difference]: With dead ends: 142 [2020-08-21 14:14:57,635 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 14:14:57,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:14:57,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 14:14:57,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-21 14:14:57,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 14:14:57,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-21 14:14:57,641 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-21 14:14:57,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:14:57,641 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-21 14:14:57,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 14:14:57,641 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-21 14:14:57,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 14:14:57,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:14:57,642 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:14:57,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 14:14:57,643 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:14:57,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:14:57,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-21 14:14:57,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:14:57,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1660754561] [2020-08-21 14:14:57,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:14:57,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:58,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:14:58,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:14:58,631 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:14:58,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1660754561] [2020-08-21 14:14:58,632 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:14:58,632 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 14:14:58,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1210825201] [2020-08-21 14:14:58,635 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 14:14:58,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:14:58,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 14:14:58,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 14:14:58,636 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-21 14:15:00,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:00,329 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-21 14:15:00,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 14:15:00,330 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-21 14:15:00,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:00,331 INFO L225 Difference]: With dead ends: 146 [2020-08-21 14:15:00,331 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 14:15:00,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 14:15:00,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 14:15:00,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-21 14:15:00,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 14:15:00,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-21 14:15:00,338 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-21 14:15:00,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:00,338 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-21 14:15:00,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 14:15:00,338 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-21 14:15:00,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 14:15:00,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:00,339 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:00,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 14:15:00,339 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:00,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:00,339 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-21 14:15:00,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:00,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1518946771] [2020-08-21 14:15:00,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:00,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:01,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:01,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:01,380 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:01,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1518946771] [2020-08-21 14:15:01,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:01,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 14:15:01,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489794579] [2020-08-21 14:15:01,381 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 14:15:01,381 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:01,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 14:15:01,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 14:15:01,382 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-21 14:15:03,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:03,290 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-21 14:15:03,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 14:15:03,291 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-21 14:15:03,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:03,292 INFO L225 Difference]: With dead ends: 150 [2020-08-21 14:15:03,292 INFO L226 Difference]: Without dead ends: 81 [2020-08-21 14:15:03,294 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 14:15:03,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-21 14:15:03,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-21 14:15:03,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-21 14:15:03,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-21 14:15:03,300 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-21 14:15:03,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:03,300 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-21 14:15:03,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 14:15:03,300 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-21 14:15:03,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-21 14:15:03,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:03,301 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:03,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 14:15:03,301 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:03,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:03,301 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-21 14:15:03,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:03,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618887642] [2020-08-21 14:15:03,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:03,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:04,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:04,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:04,330 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:04,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618887642] [2020-08-21 14:15:04,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:04,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 14:15:04,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561722326] [2020-08-21 14:15:04,331 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 14:15:04,331 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:04,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 14:15:04,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 14:15:04,332 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-21 14:15:06,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:06,253 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-21 14:15:06,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 14:15:06,257 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-21 14:15:06,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:06,258 INFO L225 Difference]: With dead ends: 154 [2020-08-21 14:15:06,258 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 14:15:06,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:15:06,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 14:15:06,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-21 14:15:06,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-21 14:15:06,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-21 14:15:06,266 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-21 14:15:06,266 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:06,267 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-21 14:15:06,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 14:15:06,267 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-21 14:15:06,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 14:15:06,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:06,268 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:06,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 14:15:06,268 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:06,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:06,268 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-21 14:15:06,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:06,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1685047249] [2020-08-21 14:15:06,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:06,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:07,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:07,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:07,421 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:07,423 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1685047249] [2020-08-21 14:15:07,423 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:07,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 14:15:07,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097838940] [2020-08-21 14:15:07,424 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 14:15:07,424 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:07,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 14:15:07,425 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 14:15:07,425 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-21 14:15:09,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:09,336 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-21 14:15:09,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 14:15:09,336 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-21 14:15:09,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:09,338 INFO L225 Difference]: With dead ends: 158 [2020-08-21 14:15:09,338 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 14:15:09,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:15:09,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 14:15:09,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-21 14:15:09,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 14:15:09,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-21 14:15:09,346 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-21 14:15:09,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:09,346 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-21 14:15:09,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 14:15:09,346 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-21 14:15:09,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 14:15:09,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:09,347 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:09,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 14:15:09,348 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:09,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:09,348 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-21 14:15:09,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:09,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1890000057] [2020-08-21 14:15:09,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:09,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:10,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:10,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:10,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:10,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1890000057] [2020-08-21 14:15:10,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:10,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 14:15:10,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639075129] [2020-08-21 14:15:10,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 14:15:10,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:10,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 14:15:10,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 14:15:10,479 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-21 14:15:12,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:12,459 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-21 14:15:12,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 14:15:12,461 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-21 14:15:12,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:12,462 INFO L225 Difference]: With dead ends: 162 [2020-08-21 14:15:12,462 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 14:15:12,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 14:15:12,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 14:15:12,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-21 14:15:12,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-21 14:15:12,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-21 14:15:12,472 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-21 14:15:12,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:12,472 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-21 14:15:12,472 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 14:15:12,472 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-21 14:15:12,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-21 14:15:12,473 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:12,473 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:12,473 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 14:15:12,474 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:12,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:12,474 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-21 14:15:12,474 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:12,474 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280480667] [2020-08-21 14:15:12,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:12,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:13,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:13,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:13,716 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:13,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280480667] [2020-08-21 14:15:13,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:13,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 14:15:13,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556018933] [2020-08-21 14:15:13,717 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 14:15:13,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:13,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 14:15:13,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 14:15:13,718 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-21 14:15:15,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:15,903 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-21 14:15:15,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 14:15:15,905 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-21 14:15:15,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:15,906 INFO L225 Difference]: With dead ends: 166 [2020-08-21 14:15:15,906 INFO L226 Difference]: Without dead ends: 89 [2020-08-21 14:15:15,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:15:15,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-21 14:15:15,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-21 14:15:15,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-21 14:15:15,912 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-21 14:15:15,912 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-21 14:15:15,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:15,912 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-21 14:15:15,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 14:15:15,912 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-21 14:15:15,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 14:15:15,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:15,913 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:15,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 14:15:15,914 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:15,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:15,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-21 14:15:15,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:15,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [614767127] [2020-08-21 14:15:15,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:15,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:17,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:17,233 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:17,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [614767127] [2020-08-21 14:15:17,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:17,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 14:15:17,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [868965642] [2020-08-21 14:15:17,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 14:15:17,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:17,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 14:15:17,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 14:15:17,235 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-21 14:15:19,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:19,494 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-21 14:15:19,499 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 14:15:19,500 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-21 14:15:19,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:19,501 INFO L225 Difference]: With dead ends: 170 [2020-08-21 14:15:19,501 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 14:15:19,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:15:19,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 14:15:19,514 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-21 14:15:19,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 14:15:19,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-21 14:15:19,515 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-21 14:15:19,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:19,516 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-21 14:15:19,516 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 14:15:19,516 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-21 14:15:19,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 14:15:19,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:19,517 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:19,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 14:15:19,517 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:19,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:19,518 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-21 14:15:19,518 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:19,518 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260887114] [2020-08-21 14:15:19,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:19,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:20,885 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:20,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:20,898 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:20,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260887114] [2020-08-21 14:15:20,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:20,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 14:15:20,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2098641658] [2020-08-21 14:15:20,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 14:15:20,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:20,899 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 14:15:20,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 14:15:20,900 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-21 14:15:23,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:23,398 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-21 14:15:23,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 14:15:23,399 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-21 14:15:23,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:23,400 INFO L225 Difference]: With dead ends: 174 [2020-08-21 14:15:23,400 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 14:15:23,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:15:23,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 14:15:23,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-21 14:15:23,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 14:15:23,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-21 14:15:23,408 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-21 14:15:23,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:23,408 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-21 14:15:23,408 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 14:15:23,409 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-21 14:15:23,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-21 14:15:23,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:23,411 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:23,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 14:15:23,412 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:23,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:23,413 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-21 14:15:23,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:23,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664084686] [2020-08-21 14:15:23,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:23,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:24,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 14:15:24,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 14:15:24,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 14:15:24,867 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664084686] [2020-08-21 14:15:24,867 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 14:15:24,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 14:15:24,867 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1459054763] [2020-08-21 14:15:24,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 14:15:24,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 14:15:24,868 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 14:15:24,868 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 14:15:24,868 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-21 14:15:27,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 14:15:27,335 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-21 14:15:27,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 14:15:27,336 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-21 14:15:27,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 14:15:27,337 INFO L225 Difference]: With dead ends: 178 [2020-08-21 14:15:27,337 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 14:15:27,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 14:15:27,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 14:15:27,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-21 14:15:27,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-21 14:15:27,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-21 14:15:27,344 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-21 14:15:27,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 14:15:27,344 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-21 14:15:27,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 14:15:27,345 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-21 14:15:27,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 14:15:27,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 14:15:27,346 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 14:15:27,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 14:15:27,346 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 14:15:27,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 14:15:27,346 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-21 14:15:27,346 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 14:15:27,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833756641] [2020-08-21 14:15:27,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 14:15:27,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat