/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:27:54,251 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:27:54,253 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:27:54,276 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:27:54,277 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:27:54,278 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:27:54,279 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:27:54,281 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:27:54,283 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:27:54,283 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:27:54,284 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:27:54,286 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:27:54,286 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:27:54,287 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:27:54,288 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:27:54,289 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:27:54,290 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:27:54,291 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:27:54,292 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:27:54,294 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:27:54,296 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:27:54,297 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:27:54,298 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:27:54,299 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:27:54,302 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 17:27:54,302 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 17:27:54,302 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 17:27:54,303 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 17:27:54,304 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 17:27:54,305 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 17:27:54,305 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 17:27:54,306 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 17:27:54,306 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 17:27:54,307 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 17:27:54,308 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 17:27:54,308 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 17:27:54,309 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 17:27:54,309 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 17:27:54,309 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:27:54,310 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:27:54,311 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:27:54,312 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 17:27:54,351 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:27:54,351 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:27:54,354 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:27:54,354 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:27:54,354 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:27:54,355 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:27:54,355 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:27:54,355 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:27:54,355 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:27:54,355 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:27:54,356 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:27:54,356 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:27:54,356 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:27:54,356 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:27:54,356 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:27:54,358 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:27:54,358 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:27:54,359 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:27:54,359 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:27:54,359 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:27:54,359 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:27:54,360 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:54,360 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:27:54,360 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:27:54,360 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:27:54,360 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:27:54,361 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:27:54,361 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:27:54,361 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:27:54,361 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:27:54,667 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:27:54,679 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:27:54,687 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:27:54,688 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:27:54,689 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:27:54,689 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 17:27:54,750 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c1d3eb8bd/ae6313133a1442759888fa7bd209ee78/FLAG8b4e84585 [2020-08-21 17:27:55,261 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:27:55,261 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 17:27:55,266 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c1d3eb8bd/ae6313133a1442759888fa7bd209ee78/FLAG8b4e84585 [2020-08-21 17:27:55,664 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c1d3eb8bd/ae6313133a1442759888fa7bd209ee78 [2020-08-21 17:27:55,675 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:27:55,677 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:27:55,682 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:55,682 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:27:55,686 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:27:55,687 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:55,690 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@50be01d3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55, skipping insertion in model container [2020-08-21 17:27:55,690 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:55,699 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:27:55,718 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:27:55,936 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:55,939 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:27:55,956 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:55,976 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:27:55,976 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55 WrapperNode [2020-08-21 17:27:55,976 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:55,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:27:55,978 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:27:55,978 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:27:56,069 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:56,070 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:56,076 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:56,077 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:56,084 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:56,090 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:56,091 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... [2020-08-21 17:27:56,093 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:27:56,093 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:27:56,093 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:27:56,094 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:27:56,095 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:56,149 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:27:56,149 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:27:56,149 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 17:27:56,149 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:27:56,150 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:27:56,150 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 17:27:56,150 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:27:56,150 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 17:27:56,150 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 17:27:56,151 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 17:27:56,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 17:27:56,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:27:56,151 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:27:56,437 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:27:56,438 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 17:27:56,446 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:56 BoogieIcfgContainer [2020-08-21 17:27:56,446 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:27:56,451 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:27:56,451 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:27:56,459 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:27:56,459 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:27:55" (1/3) ... [2020-08-21 17:27:56,460 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1481b3c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:56, skipping insertion in model container [2020-08-21 17:27:56,460 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:55" (2/3) ... [2020-08-21 17:27:56,461 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1481b3c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:56, skipping insertion in model container [2020-08-21 17:27:56,461 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:56" (3/3) ... [2020-08-21 17:27:56,463 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-21 17:27:56,471 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:27:56,477 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:27:56,490 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:27:56,509 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:27:56,509 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:27:56,510 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:27:56,510 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:27:56,510 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:27:56,510 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:27:56,510 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:27:56,510 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:27:56,525 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 17:27:56,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 17:27:56,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:56,531 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:56,532 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:56,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:56,538 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-21 17:27:56,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:56,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489990475] [2020-08-21 17:27:56,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:56,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:56,688 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:56,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:56,698 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:56,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489990475] [2020-08-21 17:27:56,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:56,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 17:27:56,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1241339874] [2020-08-21 17:27:56,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 17:27:56,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:56,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 17:27:56,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:27:56,720 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-21 17:27:56,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:56,803 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-21 17:27:56,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:27:56,805 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-21 17:27:56,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:56,814 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:27:56,814 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 17:27:56,818 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 17:27:56,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 17:27:56,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 17:27:56,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 17:27:56,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 17:27:56,861 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 17:27:56,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:56,861 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 17:27:56,862 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 17:27:56,862 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 17:27:56,863 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 17:27:56,863 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:56,863 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:56,864 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:27:56,864 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:56,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:56,865 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-21 17:27:56,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:56,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [303198018] [2020-08-21 17:27:56,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:56,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:56,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:56,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,006 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:57,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [303198018] [2020-08-21 17:27:57,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:57,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:27:57,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735811604] [2020-08-21 17:27:57,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:27:57,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:57,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:27:57,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:57,013 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-21 17:27:57,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,073 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 17:27:57,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:27:57,074 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 17:27:57,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,075 INFO L225 Difference]: With dead ends: 22 [2020-08-21 17:27:57,076 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 17:27:57,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:57,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 17:27:57,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-21 17:27:57,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 17:27:57,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 17:27:57,083 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-21 17:27:57,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,084 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 17:27:57,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:27:57,084 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 17:27:57,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 17:27:57,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,085 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:57,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:27:57,086 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,087 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-21 17:27:57,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530935037] [2020-08-21 17:27:57,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:57,152 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530935037] [2020-08-21 17:27:57,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:57,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 17:27:57,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818261715] [2020-08-21 17:27:57,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:57,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:57,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:57,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:57,155 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-21 17:27:57,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,210 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 17:27:57,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:27:57,210 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 17:27:57,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,211 INFO L225 Difference]: With dead ends: 24 [2020-08-21 17:27:57,212 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 17:27:57,213 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:57,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 17:27:57,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-21 17:27:57,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 17:27:57,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 17:27:57,219 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-21 17:27:57,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,219 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 17:27:57,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:57,220 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 17:27:57,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 17:27:57,221 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,221 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:57,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:27:57,221 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-21 17:27:57,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,223 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198189765] [2020-08-21 17:27:57,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,291 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:57,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198189765] [2020-08-21 17:27:57,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:57,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:27:57,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1683426721] [2020-08-21 17:27:57,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:27:57,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:57,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:27:57,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:57,294 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-21 17:27:57,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,347 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 17:27:57,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:27:57,347 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 17:27:57,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,348 INFO L225 Difference]: With dead ends: 26 [2020-08-21 17:27:57,349 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 17:27:57,349 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:57,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 17:27:57,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-21 17:27:57,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 17:27:57,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 17:27:57,356 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-21 17:27:57,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,356 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 17:27:57,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:27:57,357 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 17:27:57,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 17:27:57,357 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,358 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:57,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:27:57,358 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,359 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-21 17:27:57,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,360 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641705133] [2020-08-21 17:27:57,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,461 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:57,462 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641705133] [2020-08-21 17:27:57,463 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:57,463 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:27:57,463 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854802247] [2020-08-21 17:27:57,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:27:57,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:57,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:27:57,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:57,466 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-21 17:27:57,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,552 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 17:27:57,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:27:57,552 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 17:27:57,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,553 INFO L225 Difference]: With dead ends: 28 [2020-08-21 17:27:57,554 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 17:27:57,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:57,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 17:27:57,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 17:27:57,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 17:27:57,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 17:27:57,567 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-21 17:27:57,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,568 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 17:27:57,568 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:27:57,568 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 17:27:57,569 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:27:57,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,570 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:57,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:27:57,571 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,571 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-21 17:27:57,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2134562186] [2020-08-21 17:27:57,573 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,708 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:57,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2134562186] [2020-08-21 17:27:57,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:57,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:27:57,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932668028] [2020-08-21 17:27:57,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:27:57,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:57,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:27:57,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:57,711 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-21 17:27:57,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,770 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 17:27:57,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:27:57,770 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-21 17:27:57,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,771 INFO L225 Difference]: With dead ends: 30 [2020-08-21 17:27:57,771 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 17:27:57,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:57,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 17:27:57,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 17:27:57,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 17:27:57,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 17:27:57,778 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-21 17:27:57,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,778 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 17:27:57,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:27:57,779 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 17:27:57,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 17:27:57,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,780 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:57,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:27:57,780 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,781 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-21 17:27:57,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1159814820] [2020-08-21 17:27:57,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,876 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:57,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1159814820] [2020-08-21 17:27:57,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:57,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:27:57,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [302317851] [2020-08-21 17:27:57,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:27:57,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:57,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:27:57,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:57,879 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-21 17:27:57,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,952 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 17:27:57,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:27:57,953 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-21 17:27:57,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,954 INFO L225 Difference]: With dead ends: 32 [2020-08-21 17:27:57,954 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 17:27:57,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:57,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 17:27:57,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 17:27:57,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 17:27:57,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 17:27:57,961 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-21 17:27:57,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,961 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 17:27:57,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:27:57,961 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 17:27:57,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 17:27:57,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,962 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:57,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:27:57,963 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,963 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-21 17:27:57,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [276926674] [2020-08-21 17:27:57,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,060 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:58,061 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [276926674] [2020-08-21 17:27:58,061 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:58,061 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:27:58,062 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [869150817] [2020-08-21 17:27:58,062 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:27:58,062 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:27:58,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:58,063 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-21 17:27:58,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,135 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 17:27:58,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:27:58,136 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-21 17:27:58,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,137 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:27:58,137 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 17:27:58,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:58,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 17:27:58,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 17:27:58,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 17:27:58,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 17:27:58,143 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-21 17:27:58,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,144 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 17:27:58,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:27:58,144 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 17:27:58,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:27:58,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,145 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:27:58,146 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,146 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-21 17:27:58,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11962108] [2020-08-21 17:27:58,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,247 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:58,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11962108] [2020-08-21 17:27:58,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:58,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:27:58,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [753467341] [2020-08-21 17:27:58,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:27:58,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:27:58,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:27:58,249 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-21 17:27:58,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,318 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 17:27:58,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:27:58,319 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-21 17:27:58,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,320 INFO L225 Difference]: With dead ends: 36 [2020-08-21 17:27:58,320 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:27:58,321 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:27:58,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:27:58,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 17:27:58,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 17:27:58,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 17:27:58,326 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-21 17:27:58,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,326 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 17:27:58,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:27:58,327 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 17:27:58,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 17:27:58,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,328 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:27:58,328 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,329 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-21 17:27:58,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [590775604] [2020-08-21 17:27:58,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,439 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,444 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:58,445 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [590775604] [2020-08-21 17:27:58,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:58,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:27:58,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1976715496] [2020-08-21 17:27:58,446 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:27:58,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:27:58,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:27:58,447 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-21 17:27:58,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,537 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 17:27:58,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:27:58,538 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-21 17:27:58,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,539 INFO L225 Difference]: With dead ends: 38 [2020-08-21 17:27:58,539 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:27:58,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:27:58,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:27:58,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 17:27:58,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 17:27:58,546 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 17:27:58,547 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-21 17:27:58,547 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,547 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 17:27:58,547 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:27:58,548 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 17:27:58,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 17:27:58,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,549 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:27:58,549 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,550 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-21 17:27:58,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [669141781] [2020-08-21 17:27:58,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,698 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:58,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [669141781] [2020-08-21 17:27:58,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:58,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:27:58,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1638856093] [2020-08-21 17:27:58,701 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:27:58,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:27:58,702 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:27:58,703 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-21 17:27:58,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:58,792 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 17:27:58,792 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:27:58,793 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-21 17:27:58,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:58,794 INFO L225 Difference]: With dead ends: 40 [2020-08-21 17:27:58,795 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 17:27:58,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:27:58,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 17:27:58,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 17:27:58,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 17:27:58,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 17:27:58,803 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-21 17:27:58,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:58,803 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 17:27:58,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:27:58,803 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 17:27:58,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 17:27:58,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:58,807 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:58,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:27:58,807 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:58,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:58,808 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-21 17:27:58,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:58,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383525630] [2020-08-21 17:27:58,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:58,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:58,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:58,991 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:58,991 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383525630] [2020-08-21 17:27:58,991 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:58,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:27:58,992 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32548886] [2020-08-21 17:27:58,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:27:58,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:58,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:27:58,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:27:58,993 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-21 17:27:59,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,059 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 17:27:59,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:27:59,059 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-21 17:27:59,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,060 INFO L225 Difference]: With dead ends: 42 [2020-08-21 17:27:59,060 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 17:27:59,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:27:59,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 17:27:59,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 17:27:59,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 17:27:59,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 17:27:59,066 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-21 17:27:59,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,066 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 17:27:59,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:27:59,067 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 17:27:59,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 17:27:59,068 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,068 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:27:59,068 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,069 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-21 17:27:59,069 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422136748] [2020-08-21 17:27:59,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,209 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:59,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422136748] [2020-08-21 17:27:59,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:27:59,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1860538673] [2020-08-21 17:27:59,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:27:59,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:27:59,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:59,211 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-21 17:27:59,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,299 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 17:27:59,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:27:59,300 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-21 17:27:59,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,301 INFO L225 Difference]: With dead ends: 44 [2020-08-21 17:27:59,301 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 17:27:59,301 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:59,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 17:27:59,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 17:27:59,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 17:27:59,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 17:27:59,306 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-21 17:27:59,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,307 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 17:27:59,307 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:27:59,307 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 17:27:59,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 17:27:59,308 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,308 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:27:59,308 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-21 17:27:59,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,309 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [69383095] [2020-08-21 17:27:59,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,480 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:59,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [69383095] [2020-08-21 17:27:59,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,481 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:27:59,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428697011] [2020-08-21 17:27:59,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:27:59,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:27:59,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:27:59,482 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-21 17:27:59,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,565 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 17:27:59,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:27:59,565 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-21 17:27:59,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,566 INFO L225 Difference]: With dead ends: 46 [2020-08-21 17:27:59,566 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 17:27:59,567 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:27:59,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 17:27:59,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 17:27:59,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:27:59,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 17:27:59,573 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-21 17:27:59,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,573 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 17:27:59,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:27:59,573 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 17:27:59,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 17:27:59,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,574 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:27:59,575 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-21 17:27:59,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909932587] [2020-08-21 17:27:59,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,756 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:59,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909932587] [2020-08-21 17:27:59,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:27:59,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1395210034] [2020-08-21 17:27:59,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:27:59,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:27:59,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:27:59,759 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-21 17:27:59,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:59,834 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 17:27:59,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:27:59,834 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-21 17:27:59,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:59,835 INFO L225 Difference]: With dead ends: 48 [2020-08-21 17:27:59,835 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 17:27:59,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:27:59,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 17:27:59,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 17:27:59,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:27:59,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 17:27:59,840 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-21 17:27:59,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:59,840 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 17:27:59,841 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:27:59,841 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 17:27:59,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 17:27:59,841 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:59,842 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:59,842 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:27:59,842 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:59,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:59,842 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-21 17:27:59,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:59,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [909182943] [2020-08-21 17:27:59,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:59,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,032 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:00,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,037 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:00,037 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [909182943] [2020-08-21 17:28:00,038 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:00,038 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:28:00,038 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770819339] [2020-08-21 17:28:00,038 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:28:00,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:00,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:28:00,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:28:00,039 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-21 17:28:00,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,145 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 17:28:00,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:28:00,146 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 17:28:00,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,147 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:28:00,147 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 17:28:00,148 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:28:00,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 17:28:00,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 17:28:00,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 17:28:00,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 17:28:00,157 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-21 17:28:00,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,158 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 17:28:00,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:28:00,158 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 17:28:00,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 17:28:00,159 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,160 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:28:00,161 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-21 17:28:00,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093919337] [2020-08-21 17:28:00,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:00,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,379 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:00,379 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093919337] [2020-08-21 17:28:00,379 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:00,379 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:28:00,380 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803558452] [2020-08-21 17:28:00,380 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:28:00,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:00,381 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:28:00,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:28:00,381 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-21 17:28:00,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,504 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 17:28:00,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:28:00,504 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-21 17:28:00,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,505 INFO L225 Difference]: With dead ends: 52 [2020-08-21 17:28:00,506 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 17:28:00,507 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:28:00,507 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 17:28:00,511 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 17:28:00,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 17:28:00,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 17:28:00,512 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-21 17:28:00,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,512 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 17:28:00,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:28:00,512 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 17:28:00,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:28:00,513 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,513 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:28:00,514 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,514 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-21 17:28:00,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735755658] [2020-08-21 17:28:00,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:00,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,774 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:00,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735755658] [2020-08-21 17:28:00,775 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:00,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:28:00,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2104699919] [2020-08-21 17:28:00,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:28:00,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:00,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:28:00,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:28:00,777 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-21 17:28:00,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,882 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 17:28:00,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:28:00,882 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-21 17:28:00,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,883 INFO L225 Difference]: With dead ends: 54 [2020-08-21 17:28:00,883 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 17:28:00,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:28:00,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 17:28:00,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 17:28:00,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 17:28:00,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 17:28:00,896 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-21 17:28:00,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,896 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 17:28:00,896 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:28:00,897 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 17:28:00,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 17:28:00,897 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,897 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:28:00,901 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,902 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-21 17:28:00,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [884602637] [2020-08-21 17:28:00,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:01,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,138 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:01,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [884602637] [2020-08-21 17:28:01,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:01,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:28:01,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1676020509] [2020-08-21 17:28:01,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:28:01,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:01,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:28:01,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:28:01,140 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-21 17:28:01,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:01,259 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 17:28:01,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:28:01,259 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-21 17:28:01,259 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:01,260 INFO L225 Difference]: With dead ends: 56 [2020-08-21 17:28:01,260 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 17:28:01,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:28:01,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 17:28:01,264 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 17:28:01,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:28:01,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 17:28:01,265 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-21 17:28:01,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:01,265 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 17:28:01,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:28:01,265 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 17:28:01,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 17:28:01,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:01,266 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:01,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:28:01,266 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:01,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:01,267 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-21 17:28:01,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:01,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [216447380] [2020-08-21 17:28:01,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:01,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,579 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:01,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:01,585 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:01,586 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [216447380] [2020-08-21 17:28:01,586 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:01,586 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:28:01,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929476099] [2020-08-21 17:28:01,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:28:01,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:01,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:28:01,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:28:01,588 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-21 17:28:01,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:01,676 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 17:28:01,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:28:01,677 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-21 17:28:01,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:01,678 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:28:01,678 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 17:28:01,679 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:28:01,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 17:28:01,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 17:28:01,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 17:28:01,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 17:28:01,691 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-21 17:28:01,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:01,692 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 17:28:01,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:28:01,692 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 17:28:01,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 17:28:01,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:01,693 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:01,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:28:01,694 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:01,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:01,694 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-21 17:28:01,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:01,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1614400415] [2020-08-21 17:28:01,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:01,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:02,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,017 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:02,018 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1614400415] [2020-08-21 17:28:02,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:02,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:28:02,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468635443] [2020-08-21 17:28:02,019 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:28:02,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:02,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:28:02,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:28:02,020 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-21 17:28:02,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:02,144 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 17:28:02,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:28:02,145 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-21 17:28:02,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:02,146 INFO L225 Difference]: With dead ends: 60 [2020-08-21 17:28:02,146 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 17:28:02,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:28:02,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 17:28:02,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 17:28:02,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 17:28:02,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 17:28:02,152 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-21 17:28:02,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:02,152 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 17:28:02,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:28:02,153 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 17:28:02,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 17:28:02,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:02,153 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:02,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:28:02,154 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:02,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:02,154 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-21 17:28:02,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:02,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1223608562] [2020-08-21 17:28:02,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:02,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:02,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,467 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:02,468 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1223608562] [2020-08-21 17:28:02,468 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:02,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 17:28:02,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1109667218] [2020-08-21 17:28:02,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 17:28:02,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:02,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 17:28:02,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:28:02,470 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-21 17:28:02,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:02,567 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 17:28:02,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 17:28:02,570 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-21 17:28:02,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:02,570 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:28:02,571 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 17:28:02,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:28:02,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 17:28:02,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 17:28:02,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 17:28:02,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 17:28:02,576 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-21 17:28:02,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:02,576 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 17:28:02,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 17:28:02,576 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 17:28:02,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 17:28:02,577 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:02,577 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:02,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 17:28:02,577 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:02,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:02,578 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-21 17:28:02,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:02,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856664544] [2020-08-21 17:28:02,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:02,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:02,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:02,918 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:02,919 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856664544] [2020-08-21 17:28:02,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:02,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 17:28:02,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273411433] [2020-08-21 17:28:02,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 17:28:02,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:02,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 17:28:02,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:28:02,921 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-21 17:28:03,038 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:03,038 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 17:28:03,039 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 17:28:03,039 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-21 17:28:03,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:03,040 INFO L225 Difference]: With dead ends: 64 [2020-08-21 17:28:03,040 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 17:28:03,041 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:28:03,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 17:28:03,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 17:28:03,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 17:28:03,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 17:28:03,046 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-21 17:28:03,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:03,046 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 17:28:03,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 17:28:03,046 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 17:28:03,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 17:28:03,048 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:03,048 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:03,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 17:28:03,048 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:03,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:03,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-21 17:28:03,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:03,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082845514] [2020-08-21 17:28:03,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:03,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:03,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,390 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:03,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082845514] [2020-08-21 17:28:03,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:03,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 17:28:03,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028332054] [2020-08-21 17:28:03,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 17:28:03,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:03,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 17:28:03,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:28:03,392 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-21 17:28:03,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:03,546 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-21 17:28:03,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 17:28:03,546 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-21 17:28:03,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:03,547 INFO L225 Difference]: With dead ends: 66 [2020-08-21 17:28:03,547 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 17:28:03,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:28:03,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 17:28:03,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 17:28:03,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 17:28:03,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 17:28:03,551 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-21 17:28:03,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:03,552 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 17:28:03,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 17:28:03,552 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 17:28:03,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 17:28:03,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:03,553 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:03,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 17:28:03,553 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:03,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:03,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-21 17:28:03,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:03,554 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505823466] [2020-08-21 17:28:03,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:03,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:03,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:03,997 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:03,997 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505823466] [2020-08-21 17:28:03,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:03,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 17:28:03,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714335303] [2020-08-21 17:28:03,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 17:28:03,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:03,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 17:28:03,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:28:03,999 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-21 17:28:04,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,169 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-21 17:28:04,169 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 17:28:04,169 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-21 17:28:04,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,170 INFO L225 Difference]: With dead ends: 68 [2020-08-21 17:28:04,170 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 17:28:04,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:28:04,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 17:28:04,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 17:28:04,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 17:28:04,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-21 17:28:04,176 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-21 17:28:04,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,176 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-21 17:28:04,176 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 17:28:04,176 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-21 17:28:04,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 17:28:04,177 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,177 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,177 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 17:28:04,177 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,178 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-21 17:28:04,178 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,178 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483497685] [2020-08-21 17:28:04,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:04,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:04,573 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:04,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483497685] [2020-08-21 17:28:04,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:04,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 17:28:04,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [278942389] [2020-08-21 17:28:04,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 17:28:04,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:04,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 17:28:04,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:28:04,576 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-21 17:28:04,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:04,749 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-21 17:28:04,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 17:28:04,750 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-21 17:28:04,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:04,751 INFO L225 Difference]: With dead ends: 70 [2020-08-21 17:28:04,751 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 17:28:04,752 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:28:04,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 17:28:04,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 17:28:04,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 17:28:04,756 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-21 17:28:04,756 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-21 17:28:04,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:04,756 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-21 17:28:04,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 17:28:04,756 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-21 17:28:04,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 17:28:04,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:04,757 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:04,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 17:28:04,757 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:04,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:04,758 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-21 17:28:04,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:04,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344882707] [2020-08-21 17:28:04,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:04,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:05,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,232 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:05,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344882707] [2020-08-21 17:28:05,233 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:05,233 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 17:28:05,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775353438] [2020-08-21 17:28:05,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 17:28:05,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:05,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 17:28:05,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:28:05,235 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-21 17:28:05,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:05,412 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-21 17:28:05,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 17:28:05,413 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-21 17:28:05,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:05,414 INFO L225 Difference]: With dead ends: 72 [2020-08-21 17:28:05,414 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 17:28:05,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:28:05,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 17:28:05,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 17:28:05,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 17:28:05,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-21 17:28:05,419 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-21 17:28:05,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:05,419 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-21 17:28:05,419 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 17:28:05,419 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-21 17:28:05,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 17:28:05,420 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:05,420 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:05,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 17:28:05,420 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:05,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:05,420 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-21 17:28:05,421 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:05,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [107370258] [2020-08-21 17:28:05,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:05,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:05,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:05,859 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:05,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [107370258] [2020-08-21 17:28:05,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:05,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 17:28:05,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995140738] [2020-08-21 17:28:05,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 17:28:05,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:05,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 17:28:05,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:05,861 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-21 17:28:06,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:06,027 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-21 17:28:06,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 17:28:06,028 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-21 17:28:06,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:06,029 INFO L225 Difference]: With dead ends: 74 [2020-08-21 17:28:06,029 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 17:28:06,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:28:06,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 17:28:06,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 17:28:06,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 17:28:06,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-21 17:28:06,033 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-21 17:28:06,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:06,033 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-21 17:28:06,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 17:28:06,034 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-21 17:28:06,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 17:28:06,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:06,034 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:06,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 17:28:06,035 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:06,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:06,035 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-21 17:28:06,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:06,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907564351] [2020-08-21 17:28:06,036 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:06,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:06,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:06,603 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:06,604 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907564351] [2020-08-21 17:28:06,604 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:06,604 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 17:28:06,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [443821677] [2020-08-21 17:28:06,605 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 17:28:06,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:06,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 17:28:06,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:28:06,606 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-21 17:28:06,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:06,845 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-21 17:28:06,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 17:28:06,846 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-21 17:28:06,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:06,847 INFO L225 Difference]: With dead ends: 76 [2020-08-21 17:28:06,847 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 17:28:06,848 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:28:06,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 17:28:06,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 17:28:06,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 17:28:06,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-21 17:28:06,858 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-21 17:28:06,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:06,858 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-21 17:28:06,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 17:28:06,859 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-21 17:28:06,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 17:28:06,859 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:06,859 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:06,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 17:28:06,860 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:06,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:06,860 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-21 17:28:06,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:06,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125389438] [2020-08-21 17:28:06,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:06,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:07,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:07,426 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:07,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125389438] [2020-08-21 17:28:07,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:07,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 17:28:07,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1629342188] [2020-08-21 17:28:07,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 17:28:07,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:07,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 17:28:07,429 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:28:07,429 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-21 17:28:07,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:07,637 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-21 17:28:07,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 17:28:07,637 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-21 17:28:07,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:07,638 INFO L225 Difference]: With dead ends: 78 [2020-08-21 17:28:07,638 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 17:28:07,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:28:07,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 17:28:07,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 17:28:07,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 17:28:07,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-21 17:28:07,648 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-21 17:28:07,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:07,648 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-21 17:28:07,648 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 17:28:07,648 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-21 17:28:07,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 17:28:07,649 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:07,649 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:07,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 17:28:07,650 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:07,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:07,650 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-21 17:28:07,650 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:07,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [55572457] [2020-08-21 17:28:07,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:07,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:08,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:08,377 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:08,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [55572457] [2020-08-21 17:28:08,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:08,378 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 17:28:08,378 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111678291] [2020-08-21 17:28:08,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 17:28:08,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:08,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 17:28:08,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:28:08,380 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-21 17:28:08,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:08,634 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-21 17:28:08,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 17:28:08,635 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-21 17:28:08,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:08,637 INFO L225 Difference]: With dead ends: 80 [2020-08-21 17:28:08,637 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 17:28:08,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:28:08,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 17:28:08,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 17:28:08,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 17:28:08,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-21 17:28:08,651 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-21 17:28:08,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:08,652 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-21 17:28:08,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 17:28:08,652 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-21 17:28:08,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 17:28:08,654 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:08,654 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:08,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 17:28:08,655 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:08,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:08,656 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-21 17:28:08,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:08,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407925641] [2020-08-21 17:28:08,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:08,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,248 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:09,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:09,256 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:09,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407925641] [2020-08-21 17:28:09,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:09,257 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 17:28:09,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1878284561] [2020-08-21 17:28:09,258 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 17:28:09,258 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:09,258 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 17:28:09,259 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:09,259 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-21 17:28:09,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:09,458 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-21 17:28:09,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 17:28:09,459 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-21 17:28:09,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:09,460 INFO L225 Difference]: With dead ends: 82 [2020-08-21 17:28:09,460 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 17:28:09,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:28:09,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 17:28:09,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 17:28:09,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 17:28:09,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-21 17:28:09,467 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-21 17:28:09,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:09,467 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-21 17:28:09,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 17:28:09,467 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-21 17:28:09,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 17:28:09,468 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:09,468 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:09,469 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 17:28:09,469 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:09,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:09,469 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-21 17:28:09,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:09,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1755300610] [2020-08-21 17:28:09,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:09,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:10,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:10,121 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:10,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1755300610] [2020-08-21 17:28:10,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:10,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 17:28:10,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678839647] [2020-08-21 17:28:10,123 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 17:28:10,123 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:10,123 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 17:28:10,124 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:10,124 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-21 17:28:10,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:10,369 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-21 17:28:10,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 17:28:10,370 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-21 17:28:10,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:10,371 INFO L225 Difference]: With dead ends: 84 [2020-08-21 17:28:10,371 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 17:28:10,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:28:10,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 17:28:10,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 17:28:10,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 17:28:10,376 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-21 17:28:10,376 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-21 17:28:10,376 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:10,376 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-21 17:28:10,376 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 17:28:10,377 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-21 17:28:10,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 17:28:10,378 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:10,378 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:10,378 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 17:28:10,378 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:10,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:10,379 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-21 17:28:10,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:10,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [780980024] [2020-08-21 17:28:10,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:10,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:11,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:11,068 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [780980024] [2020-08-21 17:28:11,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:11,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 17:28:11,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156406313] [2020-08-21 17:28:11,069 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 17:28:11,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:11,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 17:28:11,070 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:11,070 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-21 17:28:11,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:11,224 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-21 17:28:11,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 17:28:11,225 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-21 17:28:11,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:11,226 INFO L225 Difference]: With dead ends: 86 [2020-08-21 17:28:11,226 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 17:28:11,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:28:11,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 17:28:11,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 17:28:11,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 17:28:11,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-21 17:28:11,231 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-21 17:28:11,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:11,231 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-21 17:28:11,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 17:28:11,231 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-21 17:28:11,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 17:28:11,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:11,232 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:11,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 17:28:11,233 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:11,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:11,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-21 17:28:11,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:11,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1085611059] [2020-08-21 17:28:11,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:11,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:11,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:11,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:11,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1085611059] [2020-08-21 17:28:11,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:11,947 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 17:28:11,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [739765137] [2020-08-21 17:28:11,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 17:28:11,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:11,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 17:28:11,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:28:11,948 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-21 17:28:12,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:12,188 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-21 17:28:12,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 17:28:12,193 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-21 17:28:12,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:12,194 INFO L225 Difference]: With dead ends: 88 [2020-08-21 17:28:12,194 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 17:28:12,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:28:12,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 17:28:12,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 17:28:12,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 17:28:12,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-21 17:28:12,198 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-21 17:28:12,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:12,198 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-21 17:28:12,198 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 17:28:12,198 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-21 17:28:12,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 17:28:12,199 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:12,199 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:12,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 17:28:12,199 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:12,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:12,200 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-21 17:28:12,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:12,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [440725232] [2020-08-21 17:28:12,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:12,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:12,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:12,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:12,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:12,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [440725232] [2020-08-21 17:28:12,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:12,955 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 17:28:12,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [95235007] [2020-08-21 17:28:12,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 17:28:12,956 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:12,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 17:28:12,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:28:12,957 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-21 17:28:13,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:13,170 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-21 17:28:13,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 17:28:13,170 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-21 17:28:13,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:13,171 INFO L225 Difference]: With dead ends: 90 [2020-08-21 17:28:13,171 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 17:28:13,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:28:13,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 17:28:13,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 17:28:13,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 17:28:13,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-21 17:28:13,176 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-21 17:28:13,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:13,177 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-21 17:28:13,177 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 17:28:13,177 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-21 17:28:13,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 17:28:13,178 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:13,178 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:13,178 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 17:28:13,179 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:13,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:13,179 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-21 17:28:13,179 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:13,179 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931890062] [2020-08-21 17:28:13,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:13,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:13,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:13,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:13,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:13,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931890062] [2020-08-21 17:28:13,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:13,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 17:28:13,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2002789201] [2020-08-21 17:28:13,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 17:28:13,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:13,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 17:28:13,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:13,958 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-21 17:28:14,103 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:14,103 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-21 17:28:14,104 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 17:28:14,104 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-21 17:28:14,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:14,105 INFO L225 Difference]: With dead ends: 92 [2020-08-21 17:28:14,105 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 17:28:14,105 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:28:14,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 17:28:14,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 17:28:14,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 17:28:14,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-21 17:28:14,113 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-21 17:28:14,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:14,114 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-21 17:28:14,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 17:28:14,114 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-21 17:28:14,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 17:28:14,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:14,115 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:14,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 17:28:14,116 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:14,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:14,117 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-21 17:28:14,117 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:14,117 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1056730921] [2020-08-21 17:28:14,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:14,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,936 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:14,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:14,944 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:14,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1056730921] [2020-08-21 17:28:14,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:14,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 17:28:14,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387128160] [2020-08-21 17:28:14,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 17:28:14,945 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:14,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 17:28:14,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:28:14,946 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-21 17:28:15,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:15,181 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-21 17:28:15,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 17:28:15,182 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-21 17:28:15,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:15,183 INFO L225 Difference]: With dead ends: 94 [2020-08-21 17:28:15,184 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 17:28:15,185 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:28:15,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 17:28:15,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 17:28:15,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 17:28:15,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-21 17:28:15,189 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-21 17:28:15,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:15,190 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-21 17:28:15,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 17:28:15,190 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-21 17:28:15,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 17:28:15,190 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:15,191 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:15,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 17:28:15,191 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:15,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:15,191 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-21 17:28:15,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:15,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346394260] [2020-08-21 17:28:15,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:15,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:16,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:16,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:16,073 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:16,073 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346394260] [2020-08-21 17:28:16,073 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:16,073 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 17:28:16,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340403834] [2020-08-21 17:28:16,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 17:28:16,074 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:16,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 17:28:16,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:28:16,075 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-21 17:28:16,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:16,315 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-21 17:28:16,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 17:28:16,316 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-21 17:28:16,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:16,317 INFO L225 Difference]: With dead ends: 96 [2020-08-21 17:28:16,317 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 17:28:16,318 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:28:16,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 17:28:16,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 17:28:16,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 17:28:16,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-21 17:28:16,322 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-21 17:28:16,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:16,323 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-21 17:28:16,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 17:28:16,323 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-21 17:28:16,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 17:28:16,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:16,324 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:16,324 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 17:28:16,324 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:16,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:16,324 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-21 17:28:16,325 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:16,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778021848] [2020-08-21 17:28:16,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:16,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:17,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:17,342 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:17,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778021848] [2020-08-21 17:28:17,343 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:17,343 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 17:28:17,343 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766109940] [2020-08-21 17:28:17,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 17:28:17,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:17,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 17:28:17,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:28:17,345 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-21 17:28:17,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:17,586 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-21 17:28:17,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 17:28:17,587 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-21 17:28:17,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:17,588 INFO L225 Difference]: With dead ends: 98 [2020-08-21 17:28:17,588 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 17:28:17,590 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:28:17,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 17:28:17,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 17:28:17,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 17:28:17,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-21 17:28:17,594 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-21 17:28:17,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:17,594 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-21 17:28:17,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 17:28:17,594 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-21 17:28:17,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 17:28:17,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:17,595 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:17,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 17:28:17,596 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:17,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:17,596 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-21 17:28:17,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:17,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1276904962] [2020-08-21 17:28:17,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:17,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:18,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:18,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:18,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:18,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1276904962] [2020-08-21 17:28:18,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:18,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 17:28:18,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105443379] [2020-08-21 17:28:18,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 17:28:18,558 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:18,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 17:28:18,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:28:18,559 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-21 17:28:18,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:18,813 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-21 17:28:18,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 17:28:18,814 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-21 17:28:18,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:18,815 INFO L225 Difference]: With dead ends: 100 [2020-08-21 17:28:18,815 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 17:28:18,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:28:18,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 17:28:18,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 17:28:18,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 17:28:18,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-21 17:28:18,820 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-21 17:28:18,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:18,820 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-21 17:28:18,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 17:28:18,821 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-21 17:28:18,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 17:28:18,824 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:18,824 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:18,824 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 17:28:18,824 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:18,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:18,825 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-21 17:28:18,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:18,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [652986907] [2020-08-21 17:28:18,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:18,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:19,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:19,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:19,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:19,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [652986907] [2020-08-21 17:28:19,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:19,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 17:28:19,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171865564] [2020-08-21 17:28:19,849 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 17:28:19,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:19,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 17:28:19,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:28:19,850 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-21 17:28:20,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:20,057 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-21 17:28:20,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 17:28:20,057 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-21 17:28:20,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:20,058 INFO L225 Difference]: With dead ends: 102 [2020-08-21 17:28:20,059 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 17:28:20,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:28:20,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 17:28:20,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 17:28:20,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 17:28:20,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-21 17:28:20,065 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-21 17:28:20,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:20,065 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-21 17:28:20,065 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 17:28:20,065 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-21 17:28:20,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 17:28:20,066 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:20,066 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:20,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 17:28:20,066 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:20,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:20,067 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-21 17:28:20,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:20,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551195657] [2020-08-21 17:28:20,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:20,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:21,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:21,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:21,161 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:21,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551195657] [2020-08-21 17:28:21,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:21,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 17:28:21,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1194141937] [2020-08-21 17:28:21,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 17:28:21,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:21,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 17:28:21,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 17:28:21,164 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-21 17:28:21,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:21,454 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-21 17:28:21,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 17:28:21,455 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-21 17:28:21,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:21,456 INFO L225 Difference]: With dead ends: 104 [2020-08-21 17:28:21,456 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 17:28:21,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 17:28:21,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 17:28:21,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 17:28:21,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 17:28:21,463 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-21 17:28:21,463 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-21 17:28:21,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:21,464 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-21 17:28:21,464 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 17:28:21,464 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-21 17:28:21,465 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 17:28:21,465 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:21,465 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:21,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 17:28:21,465 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:21,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:21,466 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-21 17:28:21,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:21,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1993314757] [2020-08-21 17:28:21,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:21,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:22,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:22,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:22,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:22,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1993314757] [2020-08-21 17:28:22,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:22,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 17:28:22,571 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [942335063] [2020-08-21 17:28:22,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 17:28:22,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:22,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 17:28:22,574 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:28:22,575 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-21 17:28:22,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:22,774 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-21 17:28:22,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 17:28:22,775 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-21 17:28:22,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:22,776 INFO L225 Difference]: With dead ends: 106 [2020-08-21 17:28:22,776 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 17:28:22,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:28:22,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 17:28:22,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 17:28:22,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 17:28:22,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-21 17:28:22,794 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-21 17:28:22,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:22,795 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-21 17:28:22,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 17:28:22,795 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-21 17:28:22,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 17:28:22,796 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:22,796 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:22,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 17:28:22,796 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:22,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:22,797 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-21 17:28:22,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:22,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1833290424] [2020-08-21 17:28:22,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:22,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:23,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:23,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:24,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:24,005 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1833290424] [2020-08-21 17:28:24,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:24,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 17:28:24,005 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071971647] [2020-08-21 17:28:24,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 17:28:24,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:24,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 17:28:24,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 17:28:24,006 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-21 17:28:24,293 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:24,294 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-21 17:28:24,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 17:28:24,294 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-21 17:28:24,295 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:24,296 INFO L225 Difference]: With dead ends: 108 [2020-08-21 17:28:24,296 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 17:28:24,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 17:28:24,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 17:28:24,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 17:28:24,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 17:28:24,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-21 17:28:24,300 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-21 17:28:24,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:24,301 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-21 17:28:24,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 17:28:24,301 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-21 17:28:24,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 17:28:24,302 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:24,302 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:24,302 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 17:28:24,302 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:24,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:24,303 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-21 17:28:24,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:24,303 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1656236253] [2020-08-21 17:28:24,303 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:24,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:25,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:25,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:25,522 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:25,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1656236253] [2020-08-21 17:28:25,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:25,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 17:28:25,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118835468] [2020-08-21 17:28:25,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 17:28:25,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:25,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 17:28:25,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 17:28:25,524 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-21 17:28:25,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:25,762 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-21 17:28:25,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 17:28:25,762 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-21 17:28:25,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:25,763 INFO L225 Difference]: With dead ends: 110 [2020-08-21 17:28:25,764 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 17:28:25,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 17:28:25,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 17:28:25,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 17:28:25,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 17:28:25,770 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-21 17:28:25,770 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-21 17:28:25,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:25,772 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-21 17:28:25,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 17:28:25,772 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-21 17:28:25,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 17:28:25,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:25,773 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:25,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 17:28:25,773 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:25,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:25,774 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-21 17:28:25,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:25,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1703308964] [2020-08-21 17:28:25,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:25,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:27,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:27,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:27,039 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:27,040 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1703308964] [2020-08-21 17:28:27,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:27,040 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 17:28:27,040 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [906797096] [2020-08-21 17:28:27,040 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 17:28:27,041 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:27,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 17:28:27,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 17:28:27,041 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-21 17:28:27,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:27,251 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-21 17:28:27,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 17:28:27,252 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-21 17:28:27,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:27,253 INFO L225 Difference]: With dead ends: 112 [2020-08-21 17:28:27,253 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 17:28:27,254 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 17:28:27,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 17:28:27,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 17:28:27,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 17:28:27,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-21 17:28:27,257 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-21 17:28:27,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:27,258 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-21 17:28:27,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 17:28:27,258 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-21 17:28:27,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 17:28:27,259 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:27,259 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:27,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 17:28:27,259 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:27,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:27,259 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-21 17:28:27,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:27,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2066046047] [2020-08-21 17:28:27,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:27,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:28,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:28,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:28,545 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:28,545 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2066046047] [2020-08-21 17:28:28,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:28,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 17:28:28,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2031542436] [2020-08-21 17:28:28,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 17:28:28,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:28,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 17:28:28,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 17:28:28,547 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-21 17:28:28,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:28,705 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-21 17:28:28,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 17:28:28,706 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-21 17:28:28,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:28,707 INFO L225 Difference]: With dead ends: 114 [2020-08-21 17:28:28,707 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 17:28:28,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 17:28:28,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 17:28:28,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 17:28:28,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 17:28:28,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-21 17:28:28,714 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-21 17:28:28,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:28,715 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-21 17:28:28,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 17:28:28,715 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-21 17:28:28,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-21 17:28:28,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:28,716 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:28,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 17:28:28,716 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:28,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:28,716 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-21 17:28:28,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:28,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [225040044] [2020-08-21 17:28:28,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:28,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:30,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:30,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:30,042 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [225040044] [2020-08-21 17:28:30,042 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:30,042 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 17:28:30,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254444667] [2020-08-21 17:28:30,043 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 17:28:30,043 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:30,043 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 17:28:30,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 17:28:30,044 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-21 17:28:30,254 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:30,254 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-21 17:28:30,255 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 17:28:30,255 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-21 17:28:30,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:30,256 INFO L225 Difference]: With dead ends: 116 [2020-08-21 17:28:30,256 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 17:28:30,257 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 17:28:30,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 17:28:30,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-21 17:28:30,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 17:28:30,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-21 17:28:30,264 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-21 17:28:30,264 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:30,265 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-21 17:28:30,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 17:28:30,265 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-21 17:28:30,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 17:28:30,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:30,266 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:30,266 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 17:28:30,266 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:30,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:30,267 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-21 17:28:30,267 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:30,267 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995966904] [2020-08-21 17:28:30,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:30,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:31,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:31,752 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:31,752 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995966904] [2020-08-21 17:28:31,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:31,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-21 17:28:31,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222661968] [2020-08-21 17:28:31,753 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-21 17:28:31,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:31,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-21 17:28:31,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 17:28:31,754 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-21 17:28:31,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:31,972 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-21 17:28:31,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-21 17:28:31,973 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-21 17:28:31,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:31,974 INFO L225 Difference]: With dead ends: 118 [2020-08-21 17:28:31,974 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 17:28:31,975 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 17:28:31,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 17:28:31,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-21 17:28:31,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-21 17:28:31,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-21 17:28:31,982 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-21 17:28:31,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:31,982 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-21 17:28:31,982 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-21 17:28:31,983 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-21 17:28:31,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-21 17:28:31,984 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:31,984 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:31,984 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-21 17:28:31,985 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:31,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:31,986 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-21 17:28:31,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:31,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173474142] [2020-08-21 17:28:31,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:32,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:33,488 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:33,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:33,513 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:33,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173474142] [2020-08-21 17:28:33,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:33,514 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-21 17:28:33,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1122430957] [2020-08-21 17:28:33,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-21 17:28:33,514 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:33,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-21 17:28:33,515 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 17:28:33,515 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-21 17:28:33,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:33,787 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-21 17:28:33,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-21 17:28:33,788 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-21 17:28:33,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:33,790 INFO L225 Difference]: With dead ends: 120 [2020-08-21 17:28:33,790 INFO L226 Difference]: Without dead ends: 114 [2020-08-21 17:28:33,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 17:28:33,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-21 17:28:33,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-21 17:28:33,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-21 17:28:33,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-21 17:28:33,794 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-21 17:28:33,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:33,795 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-21 17:28:33,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-21 17:28:33,795 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-21 17:28:33,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-21 17:28:33,796 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:33,796 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:33,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-21 17:28:33,796 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:33,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:33,796 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-21 17:28:33,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:33,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283108868] [2020-08-21 17:28:33,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:33,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:35,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:35,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:35,292 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:35,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283108868] [2020-08-21 17:28:35,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:35,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-21 17:28:35,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075129631] [2020-08-21 17:28:35,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-21 17:28:35,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:35,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-21 17:28:35,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 17:28:35,294 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-21 17:28:35,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:35,614 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-21 17:28:35,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-21 17:28:35,614 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-21 17:28:35,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:35,616 INFO L225 Difference]: With dead ends: 122 [2020-08-21 17:28:35,616 INFO L226 Difference]: Without dead ends: 116 [2020-08-21 17:28:35,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 17:28:35,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-21 17:28:35,620 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-21 17:28:35,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 17:28:35,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-21 17:28:35,621 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-21 17:28:35,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:35,621 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-21 17:28:35,621 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-21 17:28:35,622 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-21 17:28:35,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 17:28:35,622 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:35,623 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:35,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-21 17:28:35,623 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:35,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:35,623 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-21 17:28:35,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:35,624 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [758466806] [2020-08-21 17:28:35,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:35,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:37,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:37,233 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:37,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [758466806] [2020-08-21 17:28:37,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:37,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-21 17:28:37,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [535520580] [2020-08-21 17:28:37,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-21 17:28:37,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:37,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-21 17:28:37,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 17:28:37,235 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-21 17:28:37,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:37,570 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-21 17:28:37,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-21 17:28:37,570 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-21 17:28:37,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:37,572 INFO L225 Difference]: With dead ends: 124 [2020-08-21 17:28:37,572 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 17:28:37,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 17:28:37,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 17:28:37,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-21 17:28:37,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-21 17:28:37,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-21 17:28:37,577 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-21 17:28:37,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:37,578 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-21 17:28:37,578 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-21 17:28:37,578 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-21 17:28:37,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-21 17:28:37,579 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:37,579 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:37,579 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-21 17:28:37,579 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:37,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:37,580 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-21 17:28:37,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:37,580 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1162292667] [2020-08-21 17:28:37,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:37,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:39,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:39,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:39,249 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:39,249 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1162292667] [2020-08-21 17:28:39,249 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:39,249 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-21 17:28:39,249 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521707809] [2020-08-21 17:28:39,250 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-21 17:28:39,250 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:39,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-21 17:28:39,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 17:28:39,251 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-21 17:28:39,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:39,619 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-21 17:28:39,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-21 17:28:39,620 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-21 17:28:39,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:39,625 INFO L225 Difference]: With dead ends: 126 [2020-08-21 17:28:39,625 INFO L226 Difference]: Without dead ends: 120 [2020-08-21 17:28:39,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 17:28:39,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-21 17:28:39,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-21 17:28:39,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-21 17:28:39,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-21 17:28:39,631 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-21 17:28:39,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:39,631 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-21 17:28:39,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-21 17:28:39,632 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-21 17:28:39,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-21 17:28:39,632 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:39,633 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:39,633 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-21 17:28:39,633 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:39,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:39,633 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-21 17:28:39,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:39,634 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1720505732] [2020-08-21 17:28:39,634 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:39,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:41,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:41,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:41,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:41,392 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1720505732] [2020-08-21 17:28:41,392 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:41,392 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-21 17:28:41,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949321384] [2020-08-21 17:28:41,396 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-21 17:28:41,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:41,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-21 17:28:41,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 17:28:41,397 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-21 17:28:41,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:41,678 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-21 17:28:41,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-21 17:28:41,678 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-21 17:28:41,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:41,680 INFO L225 Difference]: With dead ends: 128 [2020-08-21 17:28:41,680 INFO L226 Difference]: Without dead ends: 122 [2020-08-21 17:28:41,681 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 17:28:41,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-21 17:28:41,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-21 17:28:41,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 17:28:41,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-21 17:28:41,685 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-21 17:28:41,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:41,685 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-21 17:28:41,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-21 17:28:41,685 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-21 17:28:41,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 17:28:41,686 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:41,686 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:41,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-21 17:28:41,687 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:41,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:41,687 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-21 17:28:41,687 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:41,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723136991] [2020-08-21 17:28:41,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:41,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:43,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:43,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:43,469 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:43,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723136991] [2020-08-21 17:28:43,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:43,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-21 17:28:43,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [297396309] [2020-08-21 17:28:43,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-21 17:28:43,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:43,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-21 17:28:43,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 17:28:43,471 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-21 17:28:43,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:43,841 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-21 17:28:43,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-21 17:28:43,842 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-21 17:28:43,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:43,844 INFO L225 Difference]: With dead ends: 130 [2020-08-21 17:28:43,844 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 17:28:43,844 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 17:28:43,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 17:28:43,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-21 17:28:43,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-21 17:28:43,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-21 17:28:43,848 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-21 17:28:43,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:43,849 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-21 17:28:43,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-21 17:28:43,849 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-21 17:28:43,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-21 17:28:43,850 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:43,850 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:43,850 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-21 17:28:43,850 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:43,850 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:43,851 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-21 17:28:43,851 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:43,851 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2049988265] [2020-08-21 17:28:43,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:43,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:45,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:45,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:45,769 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:45,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2049988265] [2020-08-21 17:28:45,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:45,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-21 17:28:45,770 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32250649] [2020-08-21 17:28:45,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-21 17:28:45,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:45,771 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-21 17:28:45,771 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 17:28:45,772 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-21 17:28:46,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:46,024 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-21 17:28:46,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-21 17:28:46,024 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-21 17:28:46,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:46,026 INFO L225 Difference]: With dead ends: 132 [2020-08-21 17:28:46,026 INFO L226 Difference]: Without dead ends: 126 [2020-08-21 17:28:46,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 17:28:46,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-21 17:28:46,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-21 17:28:46,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-21 17:28:46,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-21 17:28:46,035 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-21 17:28:46,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:46,035 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-21 17:28:46,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-21 17:28:46,036 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-21 17:28:46,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 17:28:46,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:46,036 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:46,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-21 17:28:46,038 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:46,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:46,038 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-21 17:28:46,038 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:46,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1968542200] [2020-08-21 17:28:46,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:46,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:48,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:48,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:48,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:48,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1968542200] [2020-08-21 17:28:48,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:48,024 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-21 17:28:48,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447002878] [2020-08-21 17:28:48,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-21 17:28:48,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:48,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-21 17:28:48,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 17:28:48,026 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-21 17:28:48,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:48,407 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-21 17:28:48,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-21 17:28:48,408 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-21 17:28:48,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:48,409 INFO L225 Difference]: With dead ends: 134 [2020-08-21 17:28:48,409 INFO L226 Difference]: Without dead ends: 128 [2020-08-21 17:28:48,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 17:28:48,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-21 17:28:48,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-21 17:28:48,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 17:28:48,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-21 17:28:48,415 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-21 17:28:48,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:48,416 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-21 17:28:48,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-21 17:28:48,416 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-21 17:28:48,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 17:28:48,417 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:48,417 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:48,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-21 17:28:48,417 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:48,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:48,417 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-21 17:28:48,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:48,418 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047442515] [2020-08-21 17:28:48,418 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:48,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:50,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:50,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:50,441 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:50,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047442515] [2020-08-21 17:28:50,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:50,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-21 17:28:50,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [957774194] [2020-08-21 17:28:50,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-21 17:28:50,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:50,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-21 17:28:50,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 17:28:50,443 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-21 17:28:50,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:50,701 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-21 17:28:50,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-21 17:28:50,702 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-21 17:28:50,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:50,703 INFO L225 Difference]: With dead ends: 136 [2020-08-21 17:28:50,704 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 17:28:50,704 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 17:28:50,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 17:28:50,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-21 17:28:50,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-21 17:28:50,707 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-21 17:28:50,708 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-21 17:28:50,708 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:50,708 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-21 17:28:50,708 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-21 17:28:50,708 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-21 17:28:50,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-21 17:28:50,709 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:50,709 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:50,709 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-21 17:28:50,709 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:50,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:50,710 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-21 17:28:50,710 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:50,710 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016547781] [2020-08-21 17:28:50,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:50,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:52,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:52,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:52,770 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:28:52,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016547781] [2020-08-21 17:28:52,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:28:52,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-08-21 17:28:52,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266028088] [2020-08-21 17:28:52,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-08-21 17:28:52,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:28:52,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-08-21 17:28:52,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-21 17:28:52,772 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 62 states. [2020-08-21 17:28:53,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:53,162 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2020-08-21 17:28:53,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-08-21 17:28:53,163 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 128 [2020-08-21 17:28:53,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:53,164 INFO L225 Difference]: With dead ends: 138 [2020-08-21 17:28:53,164 INFO L226 Difference]: Without dead ends: 132 [2020-08-21 17:28:53,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-21 17:28:53,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-08-21 17:28:53,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2020-08-21 17:28:53,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-21 17:28:53,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2020-08-21 17:28:53,168 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 128 [2020-08-21 17:28:53,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:53,168 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2020-08-21 17:28:53,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-08-21 17:28:53,168 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2020-08-21 17:28:53,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-08-21 17:28:53,169 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:53,169 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:53,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-21 17:28:53,170 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:53,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:53,170 INFO L82 PathProgramCache]: Analyzing trace with hash 2089102067, now seen corresponding path program 59 times [2020-08-21 17:28:53,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:53,170 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1433856761] [2020-08-21 17:28:53,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:53,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat