/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 22:02:08,921 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 22:02:08,924 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 22:02:08,948 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 22:02:08,948 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 22:02:08,949 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 22:02:08,951 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 22:02:08,952 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 22:02:08,954 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 22:02:08,955 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 22:02:08,956 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 22:02:08,957 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 22:02:08,957 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 22:02:08,958 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 22:02:08,959 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 22:02:08,960 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 22:02:08,961 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 22:02:08,962 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 22:02:08,963 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 22:02:08,965 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 22:02:08,966 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 22:02:08,967 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 22:02:08,968 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 22:02:08,973 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 22:02:08,978 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-18 22:02:08,978 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-18 22:02:08,978 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-18 22:02:08,979 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-18 22:02:08,983 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-18 22:02:08,984 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-18 22:02:08,984 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-18 22:02:08,985 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-18 22:02:08,986 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-18 22:02:08,988 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-18 22:02:08,989 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-18 22:02:08,989 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-18 22:02:08,990 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-18 22:02:08,990 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-18 22:02:08,991 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 22:02:08,999 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 22:02:09,000 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 22:02:09,004 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 22:02:09,045 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 22:02:09,047 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 22:02:09,048 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 22:02:09,049 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 22:02:09,049 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 22:02:09,049 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 22:02:09,049 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 22:02:09,049 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 22:02:09,050 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 22:02:09,050 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 22:02:09,050 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 22:02:09,050 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 22:02:09,050 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 22:02:09,051 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 22:02:09,051 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 22:02:09,051 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 22:02:09,051 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 22:02:09,052 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 22:02:09,052 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 22:02:09,052 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 22:02:09,052 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 22:02:09,052 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:09,053 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 22:02:09,053 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 22:02:09,053 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 22:02:09,053 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 22:02:09,053 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 22:02:09,054 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 22:02:09,055 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 22:02:09,055 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 22:02:09,369 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 22:02:09,386 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 22:02:09,392 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 22:02:09,393 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 22:02:09,394 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 22:02:09,395 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 22:02:09,474 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/51cd69560/3112c909fa3c41139166bbd2565c9ff8/FLAGd3cf88d99 [2020-08-18 22:02:09,960 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 22:02:09,961 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-18 22:02:09,967 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/51cd69560/3112c909fa3c41139166bbd2565c9ff8/FLAGd3cf88d99 [2020-08-18 22:02:10,320 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/51cd69560/3112c909fa3c41139166bbd2565c9ff8 [2020-08-18 22:02:10,329 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 22:02:10,331 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 22:02:10,332 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:10,332 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 22:02:10,336 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 22:02:10,337 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,339 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3d2b9410 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10, skipping insertion in model container [2020-08-18 22:02:10,340 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,348 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 22:02:10,364 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 22:02:10,563 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:10,607 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 22:02:10,626 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 22:02:10,694 INFO L208 MainTranslator]: Completed translation [2020-08-18 22:02:10,695 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10 WrapperNode [2020-08-18 22:02:10,695 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 22:02:10,695 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 22:02:10,696 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 22:02:10,696 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 22:02:10,783 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,783 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,791 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,791 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,812 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,821 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,823 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... [2020-08-18 22:02:10,825 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 22:02:10,826 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 22:02:10,826 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 22:02:10,826 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 22:02:10,827 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 22:02:10,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 22:02:10,883 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 22:02:10,883 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 22:02:10,883 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 22:02:10,884 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 22:02:10,884 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 22:02:10,884 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 22:02:10,884 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 22:02:10,884 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 22:02:10,885 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-18 22:02:10,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 22:02:10,885 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 22:02:11,144 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 22:02:11,145 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 22:02:11,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:11 BoogieIcfgContainer [2020-08-18 22:02:11,150 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 22:02:11,152 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 22:02:11,152 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 22:02:11,155 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 22:02:11,156 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 10:02:10" (1/3) ... [2020-08-18 22:02:11,157 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73370cbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:11, skipping insertion in model container [2020-08-18 22:02:11,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 10:02:10" (2/3) ... [2020-08-18 22:02:11,157 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73370cbf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 10:02:11, skipping insertion in model container [2020-08-18 22:02:11,157 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 10:02:11" (3/3) ... [2020-08-18 22:02:11,159 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-18 22:02:11,171 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 22:02:11,193 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 22:02:11,217 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 22:02:11,242 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 22:02:11,242 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 22:02:11,243 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 22:02:11,243 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 22:02:11,243 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 22:02:11,243 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 22:02:11,243 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 22:02:11,243 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 22:02:11,262 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-18 22:02:11,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 22:02:11,268 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:11,269 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:11,269 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:11,274 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:11,275 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-18 22:02:11,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:11,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666867379] [2020-08-18 22:02:11,282 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:11,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:11,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:11,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:11,486 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:11,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666867379] [2020-08-18 22:02:11,492 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:11,492 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 22:02:11,493 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329600242] [2020-08-18 22:02:11,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 22:02:11,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:11,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 22:02:11,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 22:02:11,520 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-18 22:02:11,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:11,676 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-18 22:02:11,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 22:02:11,679 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-18 22:02:11,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:11,689 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:02:11,689 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 22:02:11,692 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 [2020-08-18 22:02:11,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 22:02:11,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-18 22:02:11,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 22:02:11,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-18 22:02:11,725 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-18 22:02:11,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:11,726 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-18 22:02:11,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 22:02:11,727 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-18 22:02:11,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-18 22:02:11,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:11,727 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:11,728 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 22:02:11,728 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:11,729 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:11,729 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-18 22:02:11,729 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:11,729 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [629054668] [2020-08-18 22:02:11,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:11,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:11,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:11,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:11,818 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:11,819 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [629054668] [2020-08-18 22:02:11,819 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:11,819 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:02:11,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492503350] [2020-08-18 22:02:11,821 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:02:11,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:11,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:02:11,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:02:11,823 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-18 22:02:11,925 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:11,925 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-18 22:02:11,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:02:11,926 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-18 22:02:11,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:11,928 INFO L225 Difference]: With dead ends: 36 [2020-08-18 22:02:11,928 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 22:02:11,929 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 [2020-08-18 22:02:11,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 22:02:11,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-18 22:02:11,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-18 22:02:11,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-18 22:02:11,936 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-18 22:02:11,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:11,937 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-18 22:02:11,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:02:11,937 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-18 22:02:11,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 22:02:11,938 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:11,938 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:11,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 22:02:11,938 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:11,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:11,939 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-18 22:02:11,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:11,939 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [403868631] [2020-08-18 22:02:11,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:11,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:12,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,034 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:12,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [403868631] [2020-08-18 22:02:12,035 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:12,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:02:12,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970207068] [2020-08-18 22:02:12,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:02:12,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:12,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:02:12,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:02:12,037 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-18 22:02:12,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,146 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-18 22:02:12,146 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:02:12,147 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 22:02:12,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,148 INFO L225 Difference]: With dead ends: 40 [2020-08-18 22:02:12,148 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:02:12,149 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 [2020-08-18 22:02:12,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:02:12,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-18 22:02:12,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 22:02:12,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-18 22:02:12,156 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-18 22:02:12,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:12,156 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-18 22:02:12,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:02:12,157 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-18 22:02:12,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-18 22:02:12,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:12,158 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:12,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 22:02:12,159 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:12,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:12,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-18 22:02:12,160 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:12,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052732146] [2020-08-18 22:02:12,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:12,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:12,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,227 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:12,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052732146] [2020-08-18 22:02:12,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 22:02:12,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 22:02:12,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17546583] [2020-08-18 22:02:12,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 22:02:12,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:12,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 22:02:12,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 22:02:12,230 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-18 22:02:12,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,300 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-18 22:02:12,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 22:02:12,301 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-18 22:02:12,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,302 INFO L225 Difference]: With dead ends: 31 [2020-08-18 22:02:12,302 INFO L226 Difference]: Without dead ends: 21 [2020-08-18 22:02:12,303 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 [2020-08-18 22:02:12,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-18 22:02:12,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-18 22:02:12,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-18 22:02:12,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-18 22:02:12,309 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-18 22:02:12,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:12,309 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-18 22:02:12,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 22:02:12,310 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-18 22:02:12,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 22:02:12,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:12,311 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:12,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 22:02:12,311 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:12,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:12,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-18 22:02:12,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:12,313 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1828224131] [2020-08-18 22:02:12,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:12,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,427 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:12,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,435 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:12,436 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1828224131] [2020-08-18 22:02:12,436 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:12,436 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 22:02:12,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954384527] [2020-08-18 22:02:12,437 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 22:02:12,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:12,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 22:02:12,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 22:02:12,438 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-18 22:02:12,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,517 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-18 22:02:12,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 22:02:12,518 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-18 22:02:12,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,519 INFO L225 Difference]: With dead ends: 34 [2020-08-18 22:02:12,519 INFO L226 Difference]: Without dead ends: 23 [2020-08-18 22:02:12,520 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 [2020-08-18 22:02:12,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-18 22:02:12,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-18 22:02:12,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 22:02:12,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-18 22:02:12,526 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-18 22:02:12,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:12,527 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-18 22:02:12,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 22:02:12,527 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-18 22:02:12,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-18 22:02:12,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:12,528 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:12,528 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 22:02:12,529 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:12,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:12,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-18 22:02:12,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:12,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1483664414] [2020-08-18 22:02:12,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:12,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,667 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:12,668 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1483664414] [2020-08-18 22:02:12,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:12,668 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 22:02:12,668 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943948570] [2020-08-18 22:02:12,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 22:02:12,669 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:12,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 22:02:12,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 22:02:12,670 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-18 22:02:12,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,752 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-18 22:02:12,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 22:02:12,752 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-18 22:02:12,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,753 INFO L225 Difference]: With dead ends: 38 [2020-08-18 22:02:12,753 INFO L226 Difference]: Without dead ends: 25 [2020-08-18 22:02:12,754 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 [2020-08-18 22:02:12,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-18 22:02:12,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-18 22:02:12,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-18 22:02:12,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-18 22:02:12,760 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-18 22:02:12,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:12,760 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-18 22:02:12,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 22:02:12,760 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-18 22:02:12,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-18 22:02:12,761 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:12,761 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:12,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 22:02:12,762 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:12,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:12,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-18 22:02:12,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:12,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2135842163] [2020-08-18 22:02:12,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:12,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,877 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:12,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:12,884 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:12,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2135842163] [2020-08-18 22:02:12,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:12,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 22:02:12,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91025697] [2020-08-18 22:02:12,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 22:02:12,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:12,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 22:02:12,886 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 22:02:12,887 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-18 22:02:12,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:12,993 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-18 22:02:12,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 22:02:12,993 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-18 22:02:12,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:12,994 INFO L225 Difference]: With dead ends: 42 [2020-08-18 22:02:12,995 INFO L226 Difference]: Without dead ends: 27 [2020-08-18 22:02:12,995 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 [2020-08-18 22:02:12,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-18 22:02:13,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-18 22:02:13,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-18 22:02:13,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-18 22:02:13,002 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-18 22:02:13,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:13,002 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-18 22:02:13,002 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 22:02:13,002 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-18 22:02:13,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-18 22:02:13,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:13,004 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:13,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 22:02:13,004 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:13,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:13,005 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-18 22:02:13,005 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:13,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [659638055] [2020-08-18 22:02:13,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:13,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:13,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,142 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:13,143 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [659638055] [2020-08-18 22:02:13,143 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:13,143 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 22:02:13,143 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [437810577] [2020-08-18 22:02:13,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 22:02:13,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:13,144 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 22:02:13,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-18 22:02:13,145 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-18 22:02:13,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:13,258 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-18 22:02:13,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 22:02:13,259 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-18 22:02:13,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:13,260 INFO L225 Difference]: With dead ends: 46 [2020-08-18 22:02:13,260 INFO L226 Difference]: Without dead ends: 29 [2020-08-18 22:02:13,261 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 [2020-08-18 22:02:13,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-18 22:02:13,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-18 22:02:13,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-18 22:02:13,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-18 22:02:13,266 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-18 22:02:13,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:13,267 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-18 22:02:13,267 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 22:02:13,267 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-18 22:02:13,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-18 22:02:13,268 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:13,268 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:13,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 22:02:13,268 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:13,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:13,269 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-18 22:02:13,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:13,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010970145] [2020-08-18 22:02:13,270 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:13,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:13,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,406 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:13,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010970145] [2020-08-18 22:02:13,407 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:13,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 22:02:13,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197917298] [2020-08-18 22:02:13,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 22:02:13,408 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:13,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 22:02:13,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-18 22:02:13,408 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-18 22:02:13,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:13,546 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-18 22:02:13,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 22:02:13,547 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-18 22:02:13,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:13,548 INFO L225 Difference]: With dead ends: 50 [2020-08-18 22:02:13,548 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 22:02:13,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:13,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 22:02:13,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 22:02:13,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 22:02:13,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-18 22:02:13,554 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-18 22:02:13,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:13,555 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-18 22:02:13,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 22:02:13,555 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-18 22:02:13,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-18 22:02:13,556 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:13,556 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:13,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 22:02:13,556 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:13,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:13,557 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-18 22:02:13,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:13,557 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618611743] [2020-08-18 22:02:13,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:13,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:13,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:13,733 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:13,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618611743] [2020-08-18 22:02:13,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:13,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 22:02:13,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470603240] [2020-08-18 22:02:13,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 22:02:13,735 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:13,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 22:02:13,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-18 22:02:13,736 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-18 22:02:13,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:13,905 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-18 22:02:13,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 22:02:13,906 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-18 22:02:13,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:13,907 INFO L225 Difference]: With dead ends: 54 [2020-08-18 22:02:13,907 INFO L226 Difference]: Without dead ends: 33 [2020-08-18 22:02:13,908 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 [2020-08-18 22:02:13,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-18 22:02:13,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-18 22:02:13,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-18 22:02:13,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-18 22:02:13,918 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-18 22:02:13,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:13,918 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-18 22:02:13,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 22:02:13,919 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-18 22:02:13,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-18 22:02:13,923 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:13,923 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:13,923 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 22:02:13,923 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:13,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:13,924 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-18 22:02:13,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:13,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1531373612] [2020-08-18 22:02:13,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:13,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:14,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:14,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:14,172 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:14,173 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1531373612] [2020-08-18 22:02:14,173 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:14,174 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 22:02:14,174 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976079325] [2020-08-18 22:02:14,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 22:02:14,176 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:14,177 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 22:02:14,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-18 22:02:14,177 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-18 22:02:14,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:14,407 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-18 22:02:14,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 22:02:14,408 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-18 22:02:14,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:14,409 INFO L225 Difference]: With dead ends: 58 [2020-08-18 22:02:14,409 INFO L226 Difference]: Without dead ends: 35 [2020-08-18 22:02:14,410 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 [2020-08-18 22:02:14,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-18 22:02:14,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-18 22:02:14,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-18 22:02:14,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-18 22:02:14,420 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-18 22:02:14,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:14,421 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-18 22:02:14,421 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 22:02:14,421 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-18 22:02:14,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-18 22:02:14,422 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:14,422 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:14,422 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 22:02:14,423 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:14,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:14,423 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-18 22:02:14,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:14,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [685244222] [2020-08-18 22:02:14,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:14,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:14,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:14,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:14,607 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:14,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [685244222] [2020-08-18 22:02:14,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:14,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 22:02:14,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094485921] [2020-08-18 22:02:14,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 22:02:14,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:14,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 22:02:14,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-18 22:02:14,610 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-18 22:02:14,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:14,859 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-18 22:02:14,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 22:02:14,859 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-18 22:02:14,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:14,860 INFO L225 Difference]: With dead ends: 62 [2020-08-18 22:02:14,861 INFO L226 Difference]: Without dead ends: 37 [2020-08-18 22:02:14,861 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:02:14,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-18 22:02:14,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-18 22:02:14,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-18 22:02:14,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-18 22:02:14,867 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-18 22:02:14,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:14,867 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-18 22:02:14,867 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 22:02:14,868 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-18 22:02:14,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-18 22:02:14,868 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:14,868 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:14,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 22:02:14,869 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:14,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:14,869 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-18 22:02:14,869 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:14,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [887386585] [2020-08-18 22:02:14,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:14,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:15,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,104 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:15,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [887386585] [2020-08-18 22:02:15,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:15,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 22:02:15,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1378965217] [2020-08-18 22:02:15,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 22:02:15,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:15,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 22:02:15,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-18 22:02:15,110 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-18 22:02:15,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:15,344 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-18 22:02:15,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 22:02:15,344 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-18 22:02:15,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:15,345 INFO L225 Difference]: With dead ends: 66 [2020-08-18 22:02:15,345 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 22:02:15,349 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 [2020-08-18 22:02:15,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 22:02:15,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-18 22:02:15,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-18 22:02:15,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-18 22:02:15,362 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-18 22:02:15,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:15,363 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-18 22:02:15,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 22:02:15,363 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-18 22:02:15,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-18 22:02:15,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:15,366 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:15,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 22:02:15,367 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:15,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:15,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-18 22:02:15,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:15,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1424086220] [2020-08-18 22:02:15,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:15,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:15,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:15,618 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:15,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1424086220] [2020-08-18 22:02:15,619 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:15,619 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 22:02:15,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261483667] [2020-08-18 22:02:15,620 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 22:02:15,620 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:15,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 22:02:15,621 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-18 22:02:15,621 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-18 22:02:15,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:15,923 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-18 22:02:15,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 22:02:15,923 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-18 22:02:15,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:15,924 INFO L225 Difference]: With dead ends: 70 [2020-08-18 22:02:15,924 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 22:02:15,925 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 [2020-08-18 22:02:15,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 22:02:15,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-18 22:02:15,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-18 22:02:15,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-18 22:02:15,931 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-18 22:02:15,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:15,932 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-18 22:02:15,932 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 22:02:15,932 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-18 22:02:15,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-18 22:02:15,933 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:15,933 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:15,933 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 22:02:15,933 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:15,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:15,934 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-18 22:02:15,934 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:15,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942690349] [2020-08-18 22:02:15,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:15,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:16,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:16,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:16,203 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:16,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942690349] [2020-08-18 22:02:16,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:16,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 22:02:16,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52593815] [2020-08-18 22:02:16,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 22:02:16,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:16,206 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 22:02:16,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-18 22:02:16,206 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-18 22:02:16,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:16,578 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-18 22:02:16,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 22:02:16,579 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-18 22:02:16,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:16,580 INFO L225 Difference]: With dead ends: 74 [2020-08-18 22:02:16,580 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 22:02:16,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:02:16,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 22:02:16,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-18 22:02:16,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-18 22:02:16,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-18 22:02:16,590 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-18 22:02:16,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:16,591 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-18 22:02:16,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 22:02:16,591 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-18 22:02:16,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-18 22:02:16,593 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:16,594 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:16,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 22:02:16,594 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:16,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:16,594 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-18 22:02:16,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:16,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450694516] [2020-08-18 22:02:16,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:16,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:16,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:16,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:16,875 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:16,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450694516] [2020-08-18 22:02:16,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:16,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 22:02:16,876 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827126802] [2020-08-18 22:02:16,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 22:02:16,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:16,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 22:02:16,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-18 22:02:16,877 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-18 22:02:17,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:17,241 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-18 22:02:17,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 22:02:17,242 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-18 22:02:17,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:17,243 INFO L225 Difference]: With dead ends: 78 [2020-08-18 22:02:17,243 INFO L226 Difference]: Without dead ends: 45 [2020-08-18 22:02:17,244 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 [2020-08-18 22:02:17,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-18 22:02:17,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-18 22:02:17,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-18 22:02:17,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-18 22:02:17,249 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-18 22:02:17,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:17,250 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-18 22:02:17,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 22:02:17,250 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-18 22:02:17,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 22:02:17,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:17,251 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:17,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 22:02:17,251 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:17,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:17,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-18 22:02:17,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:17,252 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498517417] [2020-08-18 22:02:17,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:17,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:17,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:17,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:17,563 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:17,564 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498517417] [2020-08-18 22:02:17,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:17,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 22:02:17,565 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448753743] [2020-08-18 22:02:17,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 22:02:17,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:17,567 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 22:02:17,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-18 22:02:17,567 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-18 22:02:17,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:17,936 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-18 22:02:17,937 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 22:02:17,937 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-18 22:02:17,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:17,938 INFO L225 Difference]: With dead ends: 82 [2020-08-18 22:02:17,938 INFO L226 Difference]: Without dead ends: 47 [2020-08-18 22:02:17,939 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 [2020-08-18 22:02:17,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-18 22:02:17,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-18 22:02:17,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-18 22:02:17,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-18 22:02:17,945 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-18 22:02:17,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:17,945 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-18 22:02:17,945 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 22:02:17,945 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-18 22:02:17,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-18 22:02:17,946 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:17,946 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:17,946 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 22:02:17,946 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:17,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:17,947 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-18 22:02:17,947 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:17,947 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1832261183] [2020-08-18 22:02:17,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:17,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:18,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:18,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:18,265 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:18,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1832261183] [2020-08-18 22:02:18,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:18,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 22:02:18,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230826391] [2020-08-18 22:02:18,267 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 22:02:18,267 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:18,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 22:02:18,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-18 22:02:18,268 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-18 22:02:18,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:18,741 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-18 22:02:18,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 22:02:18,742 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-18 22:02:18,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:18,742 INFO L225 Difference]: With dead ends: 86 [2020-08-18 22:02:18,743 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 22:02:18,743 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 [2020-08-18 22:02:18,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 22:02:18,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-18 22:02:18,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 22:02:18,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-18 22:02:18,754 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-18 22:02:18,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:18,754 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-18 22:02:18,755 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 22:02:18,758 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-18 22:02:18,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-18 22:02:18,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:18,759 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:18,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 22:02:18,760 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:18,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:18,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-18 22:02:18,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:18,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227595052] [2020-08-18 22:02:18,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:18,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:19,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:19,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:19,129 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:19,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227595052] [2020-08-18 22:02:19,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:19,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 22:02:19,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407741582] [2020-08-18 22:02:19,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 22:02:19,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:19,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 22:02:19,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-18 22:02:19,133 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-18 22:02:19,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:19,696 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-18 22:02:19,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 22:02:19,696 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-18 22:02:19,696 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:19,697 INFO L225 Difference]: With dead ends: 90 [2020-08-18 22:02:19,697 INFO L226 Difference]: Without dead ends: 51 [2020-08-18 22:02:19,698 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 [2020-08-18 22:02:19,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-18 22:02:19,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-18 22:02:19,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-18 22:02:19,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-18 22:02:19,704 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-18 22:02:19,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:19,704 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-18 22:02:19,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 22:02:19,704 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-18 22:02:19,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-18 22:02:19,705 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:19,705 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:19,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 22:02:19,706 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:19,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:19,706 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-18 22:02:19,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:19,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72193891] [2020-08-18 22:02:19,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:19,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:20,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:20,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:20,085 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:20,085 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72193891] [2020-08-18 22:02:20,085 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:20,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 22:02:20,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1042787509] [2020-08-18 22:02:20,086 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 22:02:20,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:20,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 22:02:20,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-18 22:02:20,087 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-18 22:02:20,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:20,678 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-18 22:02:20,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 22:02:20,679 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-18 22:02:20,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:20,679 INFO L225 Difference]: With dead ends: 94 [2020-08-18 22:02:20,679 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 22:02:20,680 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 [2020-08-18 22:02:20,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 22:02:20,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-18 22:02:20,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-18 22:02:20,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-18 22:02:20,686 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-18 22:02:20,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:20,687 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-18 22:02:20,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 22:02:20,687 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-18 22:02:20,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-18 22:02:20,688 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:20,688 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:20,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 22:02:20,688 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:20,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:20,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-18 22:02:20,689 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:20,689 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196949721] [2020-08-18 22:02:20,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:20,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:21,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:21,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:21,147 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:21,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196949721] [2020-08-18 22:02:21,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:21,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 22:02:21,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857221345] [2020-08-18 22:02:21,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 22:02:21,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:21,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 22:02:21,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-18 22:02:21,149 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-18 22:02:21,754 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:21,754 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-18 22:02:21,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 22:02:21,755 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-18 22:02:21,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:21,755 INFO L225 Difference]: With dead ends: 98 [2020-08-18 22:02:21,756 INFO L226 Difference]: Without dead ends: 55 [2020-08-18 22:02:21,756 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 [2020-08-18 22:02:21,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-18 22:02:21,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-18 22:02:21,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-18 22:02:21,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-18 22:02:21,764 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-18 22:02:21,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:21,766 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-18 22:02:21,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 22:02:21,766 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-18 22:02:21,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-18 22:02:21,767 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:21,767 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:21,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 22:02:21,767 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:21,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:21,768 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-18 22:02:21,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:21,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1240219194] [2020-08-18 22:02:21,769 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:21,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:22,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:22,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:22,202 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:22,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1240219194] [2020-08-18 22:02:22,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:22,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 22:02:22,203 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781707921] [2020-08-18 22:02:22,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 22:02:22,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:22,204 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 22:02:22,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-18 22:02:22,205 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-18 22:02:22,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:22,840 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-18 22:02:22,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 22:02:22,851 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-18 22:02:22,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:22,851 INFO L225 Difference]: With dead ends: 102 [2020-08-18 22:02:22,852 INFO L226 Difference]: Without dead ends: 57 [2020-08-18 22:02:22,852 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 [2020-08-18 22:02:22,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-18 22:02:22,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-18 22:02:22,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-18 22:02:22,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-18 22:02:22,857 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-18 22:02:22,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:22,858 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-18 22:02:22,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 22:02:22,862 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-18 22:02:22,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-18 22:02:22,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:22,863 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:22,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 22:02:22,863 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:22,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:22,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-18 22:02:22,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:22,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134870388] [2020-08-18 22:02:22,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:22,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:23,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:23,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:23,318 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:23,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134870388] [2020-08-18 22:02:23,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:23,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 22:02:23,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254071593] [2020-08-18 22:02:23,324 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 22:02:23,324 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:23,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 22:02:23,325 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-18 22:02:23,325 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-18 22:02:24,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:24,081 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-18 22:02:24,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 22:02:24,082 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-18 22:02:24,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:24,083 INFO L225 Difference]: With dead ends: 106 [2020-08-18 22:02:24,083 INFO L226 Difference]: Without dead ends: 59 [2020-08-18 22:02:24,084 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 [2020-08-18 22:02:24,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-18 22:02:24,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-18 22:02:24,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-18 22:02:24,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-18 22:02:24,089 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-18 22:02:24,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:24,089 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-18 22:02:24,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 22:02:24,090 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-18 22:02:24,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-18 22:02:24,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:24,090 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:24,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 22:02:24,091 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:24,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:24,091 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-18 22:02:24,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:24,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2029090521] [2020-08-18 22:02:24,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:24,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:24,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:24,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:24,575 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:24,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2029090521] [2020-08-18 22:02:24,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:24,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 22:02:24,575 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849683918] [2020-08-18 22:02:24,576 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 22:02:24,576 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:24,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 22:02:24,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-18 22:02:24,576 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-18 22:02:25,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:25,344 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-18 22:02:25,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 22:02:25,345 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-18 22:02:25,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:25,346 INFO L225 Difference]: With dead ends: 110 [2020-08-18 22:02:25,346 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 22:02:25,347 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 [2020-08-18 22:02:25,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 22:02:25,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-18 22:02:25,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-18 22:02:25,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-18 22:02:25,352 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-18 22:02:25,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:25,352 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-18 22:02:25,353 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 22:02:25,353 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-18 22:02:25,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-18 22:02:25,353 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:25,353 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:25,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 22:02:25,354 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:25,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:25,354 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-18 22:02:25,354 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:25,355 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1607333310] [2020-08-18 22:02:25,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:25,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:25,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:25,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:25,887 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:25,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1607333310] [2020-08-18 22:02:25,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:25,887 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 22:02:25,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1134874668] [2020-08-18 22:02:25,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 22:02:25,888 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:25,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 22:02:25,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-18 22:02:25,889 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-18 22:02:26,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:26,694 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-18 22:02:26,695 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 22:02:26,695 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-18 22:02:26,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:26,695 INFO L225 Difference]: With dead ends: 114 [2020-08-18 22:02:26,696 INFO L226 Difference]: Without dead ends: 63 [2020-08-18 22:02:26,696 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 [2020-08-18 22:02:26,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-18 22:02:26,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-18 22:02:26,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-18 22:02:26,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-18 22:02:26,701 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-18 22:02:26,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:26,702 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-18 22:02:26,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 22:02:26,702 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-18 22:02:26,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-18 22:02:26,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:26,702 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:26,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 22:02:26,703 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:26,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:26,703 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-18 22:02:26,703 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:26,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938681379] [2020-08-18 22:02:26,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:26,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:27,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:27,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:27,298 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:27,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938681379] [2020-08-18 22:02:27,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:27,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 22:02:27,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668122536] [2020-08-18 22:02:27,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 22:02:27,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:27,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 22:02:27,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-18 22:02:27,301 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-18 22:02:28,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:28,219 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-18 22:02:28,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 22:02:28,220 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-18 22:02:28,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:28,221 INFO L225 Difference]: With dead ends: 118 [2020-08-18 22:02:28,221 INFO L226 Difference]: Without dead ends: 65 [2020-08-18 22:02:28,222 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 [2020-08-18 22:02:28,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-18 22:02:28,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-18 22:02:28,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-18 22:02:28,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-18 22:02:28,228 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-18 22:02:28,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:28,229 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-18 22:02:28,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 22:02:28,229 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-18 22:02:28,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-18 22:02:28,229 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:28,230 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:28,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 22:02:28,230 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:28,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:28,230 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-18 22:02:28,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:28,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2081946594] [2020-08-18 22:02:28,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:28,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:28,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:28,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:28,840 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:28,840 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2081946594] [2020-08-18 22:02:28,840 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:28,841 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 22:02:28,841 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782726629] [2020-08-18 22:02:28,841 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 22:02:28,841 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:28,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 22:02:28,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-18 22:02:28,842 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-18 22:02:29,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:29,976 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-18 22:02:29,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 22:02:29,981 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-18 22:02:29,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:29,982 INFO L225 Difference]: With dead ends: 122 [2020-08-18 22:02:29,982 INFO L226 Difference]: Without dead ends: 67 [2020-08-18 22:02:29,983 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 [2020-08-18 22:02:29,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-18 22:02:29,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-18 22:02:29,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-18 22:02:29,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-18 22:02:29,987 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-18 22:02:29,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:29,987 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-18 22:02:29,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 22:02:29,988 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-18 22:02:29,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-18 22:02:29,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:29,988 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:29,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 22:02:29,988 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:29,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:29,989 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-18 22:02:29,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:29,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1312445765] [2020-08-18 22:02:29,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:30,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:30,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:30,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:30,701 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:30,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1312445765] [2020-08-18 22:02:30,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:30,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 22:02:30,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710525019] [2020-08-18 22:02:30,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 22:02:30,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:30,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 22:02:30,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-18 22:02:30,705 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-18 22:02:31,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:31,844 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-18 22:02:31,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 22:02:31,848 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-18 22:02:31,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:31,848 INFO L225 Difference]: With dead ends: 126 [2020-08-18 22:02:31,849 INFO L226 Difference]: Without dead ends: 69 [2020-08-18 22:02:31,849 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 [2020-08-18 22:02:31,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-18 22:02:31,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-18 22:02:31,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-18 22:02:31,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-18 22:02:31,854 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-18 22:02:31,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:31,854 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-18 22:02:31,854 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 22:02:31,854 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-18 22:02:31,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-18 22:02:31,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:31,855 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:31,855 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 22:02:31,855 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:31,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:31,856 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-18 22:02:31,856 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:31,856 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [434086124] [2020-08-18 22:02:31,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:31,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:32,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:32,506 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:32,506 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [434086124] [2020-08-18 22:02:32,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:32,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 22:02:32,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699573616] [2020-08-18 22:02:32,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 22:02:32,507 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:32,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 22:02:32,508 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-18 22:02:32,508 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-18 22:02:33,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:33,684 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-18 22:02:33,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 22:02:33,688 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-18 22:02:33,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:33,688 INFO L225 Difference]: With dead ends: 130 [2020-08-18 22:02:33,688 INFO L226 Difference]: Without dead ends: 71 [2020-08-18 22:02:33,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:02:33,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-18 22:02:33,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-18 22:02:33,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-18 22:02:33,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-18 22:02:33,694 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-18 22:02:33,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:33,694 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-18 22:02:33,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 22:02:33,695 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-18 22:02:33,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-18 22:02:33,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:33,695 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:33,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 22:02:33,696 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:33,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:33,696 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-18 22:02:33,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:33,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1383400869] [2020-08-18 22:02:33,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:33,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:34,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:34,427 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:34,428 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1383400869] [2020-08-18 22:02:34,428 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:34,428 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 22:02:34,428 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [62025505] [2020-08-18 22:02:34,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 22:02:34,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:34,429 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 22:02:34,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-18 22:02:34,430 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-18 22:02:35,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:35,772 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-18 22:02:35,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 22:02:35,772 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-18 22:02:35,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:35,773 INFO L225 Difference]: With dead ends: 134 [2020-08-18 22:02:35,773 INFO L226 Difference]: Without dead ends: 73 [2020-08-18 22:02:35,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:02:35,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-18 22:02:35,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-18 22:02:35,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-18 22:02:35,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-18 22:02:35,780 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-18 22:02:35,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:35,780 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-18 22:02:35,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 22:02:35,781 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-18 22:02:35,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-18 22:02:35,781 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:35,781 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:35,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 22:02:35,782 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:35,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:35,782 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-18 22:02:35,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:35,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [24938247] [2020-08-18 22:02:35,783 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:35,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:36,624 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:36,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:36,635 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:36,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [24938247] [2020-08-18 22:02:36,635 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:36,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 22:02:36,636 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68942881] [2020-08-18 22:02:36,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 22:02:36,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:36,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 22:02:36,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-18 22:02:36,637 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-18 22:02:38,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:38,016 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-18 22:02:38,017 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 22:02:38,017 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-18 22:02:38,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:38,018 INFO L225 Difference]: With dead ends: 138 [2020-08-18 22:02:38,018 INFO L226 Difference]: Without dead ends: 75 [2020-08-18 22:02:38,018 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 [2020-08-18 22:02:38,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-18 22:02:38,022 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-18 22:02:38,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-18 22:02:38,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-18 22:02:38,023 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-18 22:02:38,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:38,024 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-18 22:02:38,024 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 22:02:38,024 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-18 22:02:38,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-18 22:02:38,024 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:38,025 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:38,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 22:02:38,025 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:38,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:38,025 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-18 22:02:38,025 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:38,026 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2063833222] [2020-08-18 22:02:38,026 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:38,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:38,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:38,950 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:38,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2063833222] [2020-08-18 22:02:38,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:38,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 22:02:38,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544648457] [2020-08-18 22:02:38,953 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 22:02:38,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:38,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 22:02:38,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-18 22:02:38,954 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-18 22:02:41,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:41,109 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-18 22:02:41,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 22:02:41,111 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-18 22:02:41,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:41,112 INFO L225 Difference]: With dead ends: 142 [2020-08-18 22:02:41,112 INFO L226 Difference]: Without dead ends: 77 [2020-08-18 22:02:41,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:02:41,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-18 22:02:41,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-18 22:02:41,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-18 22:02:41,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-18 22:02:41,118 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-18 22:02:41,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:41,119 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-18 22:02:41,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 22:02:41,120 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-18 22:02:41,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-18 22:02:41,121 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:41,121 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:41,121 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 22:02:41,121 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:41,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:41,122 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-18 22:02:41,122 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:41,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [416833077] [2020-08-18 22:02:41,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:41,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:42,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:42,200 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:42,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [416833077] [2020-08-18 22:02:42,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:42,201 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 22:02:42,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [841047284] [2020-08-18 22:02:42,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 22:02:42,202 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:42,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 22:02:42,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 22:02:42,203 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-18 22:02:43,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:43,852 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-18 22:02:43,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 22:02:43,853 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-18 22:02:43,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:43,853 INFO L225 Difference]: With dead ends: 146 [2020-08-18 22:02:43,853 INFO L226 Difference]: Without dead ends: 79 [2020-08-18 22:02:43,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:02:43,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-18 22:02:43,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-18 22:02:43,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-18 22:02:43,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-18 22:02:43,859 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-18 22:02:43,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:43,859 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-18 22:02:43,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 22:02:43,859 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-18 22:02:43,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-18 22:02:43,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:43,860 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:43,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 22:02:43,860 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:43,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:43,860 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-18 22:02:43,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:43,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1166464814] [2020-08-18 22:02:43,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:43,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:44,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:44,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:44,829 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:44,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1166464814] [2020-08-18 22:02:44,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:44,829 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 22:02:44,829 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834368934] [2020-08-18 22:02:44,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 22:02:44,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:44,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 22:02:44,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 22:02:44,831 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-18 22:02:46,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:46,645 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-18 22:02:46,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 22:02:46,645 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-18 22:02:46,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:46,646 INFO L225 Difference]: With dead ends: 150 [2020-08-18 22:02:46,647 INFO L226 Difference]: Without dead ends: 81 [2020-08-18 22:02:46,648 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 [2020-08-18 22:02:46,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-18 22:02:46,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-18 22:02:46,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-18 22:02:46,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-18 22:02:46,653 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-18 22:02:46,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:46,654 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-18 22:02:46,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 22:02:46,654 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-18 22:02:46,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-18 22:02:46,655 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:46,655 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:46,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 22:02:46,655 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:46,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:46,656 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-18 22:02:46,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:46,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [972261520] [2020-08-18 22:02:46,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:46,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:47,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:47,664 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:47,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [972261520] [2020-08-18 22:02:47,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:47,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 22:02:47,665 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580973878] [2020-08-18 22:02:47,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 22:02:47,666 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:47,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 22:02:47,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 22:02:47,667 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-18 22:02:49,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:49,494 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-18 22:02:49,501 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 22:02:49,501 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-18 22:02:49,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:49,502 INFO L225 Difference]: With dead ends: 154 [2020-08-18 22:02:49,502 INFO L226 Difference]: Without dead ends: 83 [2020-08-18 22:02:49,503 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 [2020-08-18 22:02:49,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-18 22:02:49,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-18 22:02:49,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-18 22:02:49,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-18 22:02:49,509 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-18 22:02:49,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:49,509 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-18 22:02:49,509 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 22:02:49,509 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-18 22:02:49,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-18 22:02:49,510 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:49,510 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:49,510 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 22:02:49,510 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:49,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:49,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-18 22:02:49,511 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:49,511 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1232262809] [2020-08-18 22:02:49,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:49,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:50,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:50,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:50,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:50,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1232262809] [2020-08-18 22:02:50,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:50,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 22:02:50,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433850687] [2020-08-18 22:02:50,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 22:02:50,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:50,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 22:02:50,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 22:02:50,630 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-18 22:02:52,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:52,549 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-18 22:02:52,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 22:02:52,550 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-18 22:02:52,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:52,551 INFO L225 Difference]: With dead ends: 158 [2020-08-18 22:02:52,551 INFO L226 Difference]: Without dead ends: 85 [2020-08-18 22:02:52,553 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 [2020-08-18 22:02:52,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-18 22:02:52,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-18 22:02:52,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-18 22:02:52,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-18 22:02:52,562 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-18 22:02:52,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:52,562 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-18 22:02:52,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 22:02:52,562 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-18 22:02:52,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-18 22:02:52,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:52,563 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:52,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 22:02:52,563 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:52,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:52,564 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-18 22:02:52,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:52,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046413933] [2020-08-18 22:02:52,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:52,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:53,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:53,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:53,763 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:53,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046413933] [2020-08-18 22:02:53,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:53,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 22:02:53,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1033026423] [2020-08-18 22:02:53,764 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 22:02:53,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:53,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 22:02:53,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 22:02:53,765 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-18 22:02:55,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:55,751 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-18 22:02:55,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 22:02:55,753 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-18 22:02:55,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:55,754 INFO L225 Difference]: With dead ends: 162 [2020-08-18 22:02:55,754 INFO L226 Difference]: Without dead ends: 87 [2020-08-18 22:02:55,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:02:55,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-18 22:02:55,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-18 22:02:55,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-18 22:02:55,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-18 22:02:55,761 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-18 22:02:55,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:55,762 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-18 22:02:55,762 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 22:02:55,762 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-18 22:02:55,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-18 22:02:55,763 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:55,763 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:55,763 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 22:02:55,763 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:55,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:55,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-18 22:02:55,764 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:55,764 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294865490] [2020-08-18 22:02:55,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:55,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:57,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:02:57,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:02:57,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:02:57,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294865490] [2020-08-18 22:02:57,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:02:57,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 22:02:57,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2078898708] [2020-08-18 22:02:57,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 22:02:57,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:02:57,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 22:02:57,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 22:02:57,020 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-18 22:02:59,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:02:59,185 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-18 22:02:59,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 22:02:59,187 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-18 22:02:59,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:02:59,188 INFO L225 Difference]: With dead ends: 166 [2020-08-18 22:02:59,188 INFO L226 Difference]: Without dead ends: 89 [2020-08-18 22:02:59,189 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 [2020-08-18 22:02:59,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-18 22:02:59,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-18 22:02:59,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-18 22:02:59,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-18 22:02:59,194 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-18 22:02:59,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:02:59,194 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-18 22:02:59,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 22:02:59,194 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-18 22:02:59,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-18 22:02:59,195 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:02:59,195 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:02:59,195 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 22:02:59,195 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:02:59,196 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:02:59,196 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-18 22:02:59,196 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:02:59,196 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1033324837] [2020-08-18 22:02:59,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:02:59,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:00,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:00,584 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:00,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1033324837] [2020-08-18 22:03:00,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:00,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 22:03:00,585 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420536025] [2020-08-18 22:03:00,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 22:03:00,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:00,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 22:03:00,586 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 22:03:00,586 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-18 22:03:02,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:02,809 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-18 22:03:02,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 22:03:02,810 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-18 22:03:02,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:02,811 INFO L225 Difference]: With dead ends: 170 [2020-08-18 22:03:02,812 INFO L226 Difference]: Without dead ends: 91 [2020-08-18 22:03:02,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:03:02,813 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-18 22:03:02,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-18 22:03:02,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-18 22:03:02,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-18 22:03:02,819 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-18 22:03:02,819 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:02,819 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-18 22:03:02,819 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 22:03:02,819 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-18 22:03:02,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-18 22:03:02,820 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:02,820 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:02,820 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 22:03:02,821 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:02,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:02,821 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-18 22:03:02,821 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:02,821 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [633521481] [2020-08-18 22:03:02,821 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:02,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,178 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:04,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:04,192 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:04,192 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [633521481] [2020-08-18 22:03:04,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:04,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 22:03:04,193 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883054341] [2020-08-18 22:03:04,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 22:03:04,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:04,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 22:03:04,194 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 22:03:04,194 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-18 22:03:06,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 22:03:06,613 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-18 22:03:06,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 22:03:06,615 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-18 22:03:06,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 22:03:06,615 INFO L225 Difference]: With dead ends: 174 [2020-08-18 22:03:06,615 INFO L226 Difference]: Without dead ends: 93 [2020-08-18 22:03:06,616 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 [2020-08-18 22:03:06,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-18 22:03:06,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-18 22:03:06,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-18 22:03:06,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-18 22:03:06,624 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-18 22:03:06,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 22:03:06,625 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-18 22:03:06,625 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 22:03:06,625 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-18 22:03:06,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-18 22:03:06,626 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 22:03:06,626 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 22:03:06,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 22:03:06,626 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 22:03:06,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 22:03:06,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-18 22:03:06,627 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 22:03:06,627 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [111115593] [2020-08-18 22:03:06,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 22:03:06,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,104 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 22:03:08,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 22:03:08,118 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 22:03:08,118 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [111115593] [2020-08-18 22:03:08,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 22:03:08,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 22:03:08,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428926010] [2020-08-18 22:03:08,119 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 22:03:08,119 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 22:03:08,119 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 22:03:08,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 22:03:08,120 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.