/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 01:16:17,237 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 01:16:17,241 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 01:16:17,281 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 01:16:17,282 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 01:16:17,291 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 01:16:17,293 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 01:16:17,297 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 01:16:17,300 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 01:16:17,303 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 01:16:17,304 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 01:16:17,305 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 01:16:17,305 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 01:16:17,307 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 01:16:17,310 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 01:16:17,312 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 01:16:17,313 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 01:16:17,314 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 01:16:17,316 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 01:16:17,324 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 01:16:17,326 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 01:16:17,327 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 01:16:17,328 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 01:16:17,328 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 01:16:17,340 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 01:16:17,358 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 01:16:17,358 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 01:16:17,359 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 01:16:17,360 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 [2020-08-19 01:16:17,393 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 01:16:17,393 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 01:16:17,395 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 01:16:17,395 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 01:16:17,395 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 01:16:17,395 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 01:16:17,396 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 01:16:17,396 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 01:16:17,396 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 01:16:17,396 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 01:16:17,397 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 01:16:17,398 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 01:16:17,398 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 01:16:17,398 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 01:16:17,398 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 01:16:17,399 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 01:16:17,399 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 01:16:17,399 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 01:16:17,399 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 01:16:17,399 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 01:16:17,399 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 01:16:17,400 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:16:17,400 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 01:16:17,400 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 01:16:17,400 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 01:16:17,400 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 01:16:17,401 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 01:16:17,401 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 01:16:17,401 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 01:16:17,401 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; [2020-08-19 01:16:17,721 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 01:16:17,737 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 01:16:17,740 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 01:16:17,742 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 01:16:17,742 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 01:16:17,743 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 01:16:17,806 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0c63abc2b/159320319fad4076bafccbc04a25d307/FLAG30fee4942 [2020-08-19 01:16:18,248 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 01:16:18,248 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-19 01:16:18,255 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0c63abc2b/159320319fad4076bafccbc04a25d307/FLAG30fee4942 [2020-08-19 01:16:18,600 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/0c63abc2b/159320319fad4076bafccbc04a25d307 [2020-08-19 01:16:18,608 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 01:16:18,610 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 01:16:18,611 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 01:16:18,611 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 01:16:18,614 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 01:16:18,615 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:16:18" (1/1) ... [2020-08-19 01:16:18,618 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ccd9af2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:18, skipping insertion in model container [2020-08-19 01:16:18,619 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:16:18" (1/1) ... [2020-08-19 01:16:18,626 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 01:16:18,641 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 01:16:18,806 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:16:18,851 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 01:16:18,873 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:16:19,026 INFO L208 MainTranslator]: Completed translation [2020-08-19 01:16:19,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19 WrapperNode [2020-08-19 01:16:19,027 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 01:16:19,028 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 01:16:19,028 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 01:16:19,028 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 01:16:19,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (1/1) ... [2020-08-19 01:16:19,041 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (1/1) ... [2020-08-19 01:16:19,053 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (1/1) ... [2020-08-19 01:16:19,053 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (1/1) ... [2020-08-19 01:16:19,062 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (1/1) ... [2020-08-19 01:16:19,068 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (1/1) ... [2020-08-19 01:16:19,069 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (1/1) ... [2020-08-19 01:16:19,071 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 01:16:19,072 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 01:16:19,072 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 01:16:19,075 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 01:16:19,075 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (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 [2020-08-19 01:16:19,132 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 01:16:19,132 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 01:16:19,132 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 01:16:19,132 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 01:16:19,133 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 01:16:19,133 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-19 01:16:19,133 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-19 01:16:19,133 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 01:16:19,133 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 01:16:19,133 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-19 01:16:19,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 01:16:19,134 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 01:16:19,412 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 01:16:19,412 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 01:16:19,415 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:16:19 BoogieIcfgContainer [2020-08-19 01:16:19,416 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 01:16:19,417 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 01:16:19,417 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 01:16:19,420 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 01:16:19,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 01:16:18" (1/3) ... [2020-08-19 01:16:19,421 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@286865ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:16:19, skipping insertion in model container [2020-08-19 01:16:19,421 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:16:19" (2/3) ... [2020-08-19 01:16:19,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@286865ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:16:19, skipping insertion in model container [2020-08-19 01:16:19,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:16:19" (3/3) ... [2020-08-19 01:16:19,424 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-19 01:16:19,432 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 01:16:19,437 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 01:16:19,447 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 01:16:19,465 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 01:16:19,465 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 01:16:19,465 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 01:16:19,465 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 01:16:19,466 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 01:16:19,466 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 01:16:19,466 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 01:16:19,466 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 01:16:19,480 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-19 01:16:19,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 01:16:19,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:19,487 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:19,487 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:19,492 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:19,493 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-19 01:16:19,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:19,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [243192716] [2020-08-19 01:16:19,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:19,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:19,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:19,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:19,697 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:19,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [243192716] [2020-08-19 01:16:19,700 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:16:19,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 01:16:19,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577423728] [2020-08-19 01:16:19,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 01:16:19,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:19,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 01:16:19,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 01:16:19,729 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-19 01:16:19,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:19,828 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-19 01:16:19,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 01:16:19,830 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-19 01:16:19,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:19,840 INFO L225 Difference]: With dead ends: 42 [2020-08-19 01:16:19,840 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 01:16:19,844 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 [2020-08-19 01:16:19,858 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 01:16:19,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-19 01:16:19,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 01:16:19,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 01:16:19,878 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-19 01:16:19,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:19,879 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 01:16:19,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 01:16:19,879 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 01:16:19,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-19 01:16:19,880 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:19,880 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:19,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 01:16:19,881 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:19,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:19,882 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-19 01:16:19,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:19,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167355828] [2020-08-19 01:16:19,883 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:19,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:19,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:19,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:19,979 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:19,980 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167355828] [2020-08-19 01:16:19,980 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:16:19,981 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 01:16:19,981 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [826002208] [2020-08-19 01:16:19,983 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 01:16:19,983 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:19,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 01:16:19,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:16:19,984 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-19 01:16:20,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:20,088 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-19 01:16:20,088 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:16:20,089 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-19 01:16:20,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:20,090 INFO L225 Difference]: With dead ends: 36 [2020-08-19 01:16:20,090 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 01:16:20,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:16:20,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 01:16:20,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-19 01:16:20,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 01:16:20,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 01:16:20,098 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-19 01:16:20,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:20,099 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 01:16:20,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 01:16:20,099 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 01:16:20,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 01:16:20,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:20,100 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:20,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 01:16:20,100 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:20,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:20,101 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-19 01:16:20,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:20,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950137270] [2020-08-19 01:16:20,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:20,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:20,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,179 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:20,180 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950137270] [2020-08-19 01:16:20,180 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:16:20,180 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 01:16:20,181 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1095928956] [2020-08-19 01:16:20,181 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 01:16:20,182 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:20,182 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 01:16:20,182 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:16:20,182 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-19 01:16:20,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:20,284 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-19 01:16:20,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:16:20,285 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-19 01:16:20,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:20,286 INFO L225 Difference]: With dead ends: 40 [2020-08-19 01:16:20,287 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 01:16:20,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:16:20,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 01:16:20,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-19 01:16:20,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 01:16:20,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 01:16:20,295 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-19 01:16:20,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:20,296 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 01:16:20,296 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 01:16:20,296 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 01:16:20,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 01:16:20,297 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:20,297 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:20,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 01:16:20,298 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:20,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:20,299 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-19 01:16:20,299 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:20,299 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635439392] [2020-08-19 01:16:20,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:20,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:20,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,383 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:20,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635439392] [2020-08-19 01:16:20,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:16:20,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 01:16:20,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749584105] [2020-08-19 01:16:20,385 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 01:16:20,385 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:20,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 01:16:20,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:16:20,386 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-19 01:16:20,466 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:20,466 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-19 01:16:20,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:16:20,467 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-19 01:16:20,467 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:20,468 INFO L225 Difference]: With dead ends: 31 [2020-08-19 01:16:20,468 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 01:16:20,469 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:16:20,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 01:16:20,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-19 01:16:20,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 01:16:20,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 01:16:20,475 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-19 01:16:20,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:20,476 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 01:16:20,476 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 01:16:20,476 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 01:16:20,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 01:16:20,477 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:20,477 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:20,478 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 01:16:20,478 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:20,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:20,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-19 01:16:20,479 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:20,479 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [137978342] [2020-08-19 01:16:20,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:20,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:20,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,602 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:20,603 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [137978342] [2020-08-19 01:16:20,603 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:20,603 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 01:16:20,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823647973] [2020-08-19 01:16:20,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 01:16:20,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:20,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 01:16:20,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:16:20,605 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-19 01:16:20,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:20,692 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-19 01:16:20,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 01:16:20,693 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-19 01:16:20,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:20,694 INFO L225 Difference]: With dead ends: 34 [2020-08-19 01:16:20,694 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 01:16:20,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:16:20,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 01:16:20,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-19 01:16:20,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 01:16:20,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 01:16:20,701 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-19 01:16:20,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:20,702 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 01:16:20,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 01:16:20,702 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 01:16:20,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 01:16:20,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:20,703 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:20,704 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 01:16:20,704 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:20,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:20,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-19 01:16:20,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:20,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526881779] [2020-08-19 01:16:20,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:20,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:20,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:20,845 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:20,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526881779] [2020-08-19 01:16:20,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:20,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 01:16:20,846 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66638712] [2020-08-19 01:16:20,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 01:16:20,847 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:20,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 01:16:20,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:16:20,847 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-19 01:16:20,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:20,936 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-19 01:16:20,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 01:16:20,936 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-19 01:16:20,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:20,937 INFO L225 Difference]: With dead ends: 38 [2020-08-19 01:16:20,937 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 01:16:20,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:16:20,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 01:16:20,942 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-19 01:16:20,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 01:16:20,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-19 01:16:20,943 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-19 01:16:20,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:20,944 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-19 01:16:20,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 01:16:20,944 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-19 01:16:20,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 01:16:20,945 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:20,945 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:20,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 01:16:20,945 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:20,946 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:20,946 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-19 01:16:20,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:20,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364867912] [2020-08-19 01:16:20,947 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:20,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:21,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:21,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:21,065 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:21,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364867912] [2020-08-19 01:16:21,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:21,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 01:16:21,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [604342789] [2020-08-19 01:16:21,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 01:16:21,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:21,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 01:16:21,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:16:21,067 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-19 01:16:21,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:21,188 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-19 01:16:21,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 01:16:21,189 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-19 01:16:21,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:21,190 INFO L225 Difference]: With dead ends: 42 [2020-08-19 01:16:21,191 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 01:16:21,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-19 01:16:21,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 01:16:21,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-19 01:16:21,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 01:16:21,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-19 01:16:21,198 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-19 01:16:21,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:21,198 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-19 01:16:21,199 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 01:16:21,199 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-19 01:16:21,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 01:16:21,200 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:21,200 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:21,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 01:16:21,200 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:21,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:21,201 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-19 01:16:21,201 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:21,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942155134] [2020-08-19 01:16:21,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:21,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:21,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:21,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:21,379 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:21,380 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942155134] [2020-08-19 01:16:21,380 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:21,380 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 01:16:21,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1166532266] [2020-08-19 01:16:21,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 01:16:21,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:21,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 01:16:21,385 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-19 01:16:21,385 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-19 01:16:21,515 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:21,516 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-19 01:16:21,516 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 01:16:21,516 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-19 01:16:21,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:21,517 INFO L225 Difference]: With dead ends: 46 [2020-08-19 01:16:21,518 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 01:16:21,518 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:16:21,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 01:16:21,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-19 01:16:21,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 01:16:21,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-19 01:16:21,524 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-19 01:16:21,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:21,525 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-19 01:16:21,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 01:16:21,525 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-19 01:16:21,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 01:16:21,526 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:21,526 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:21,527 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 01:16:21,527 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:21,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:21,527 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-19 01:16:21,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:21,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334067166] [2020-08-19 01:16:21,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:21,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:21,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:21,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:21,703 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:21,703 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334067166] [2020-08-19 01:16:21,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:21,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 01:16:21,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988295401] [2020-08-19 01:16:21,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 01:16:21,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:21,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 01:16:21,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:16:21,706 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-19 01:16:21,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:21,856 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-19 01:16:21,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 01:16:21,858 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-19 01:16:21,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:21,859 INFO L225 Difference]: With dead ends: 50 [2020-08-19 01:16:21,859 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 01:16:21,862 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:16:21,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 01:16:21,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 01:16:21,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 01:16:21,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-19 01:16:21,875 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-19 01:16:21,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:21,876 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-19 01:16:21,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 01:16:21,876 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-19 01:16:21,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 01:16:21,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:21,878 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:21,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 01:16:21,882 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:21,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:21,883 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-19 01:16:21,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:21,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [431803964] [2020-08-19 01:16:21,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:21,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:22,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,122 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:22,122 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [431803964] [2020-08-19 01:16:22,122 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:22,122 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 01:16:22,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78538166] [2020-08-19 01:16:22,124 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 01:16:22,124 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:22,124 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 01:16:22,125 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:16:22,125 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-19 01:16:22,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:22,314 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-19 01:16:22,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 01:16:22,315 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-19 01:16:22,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:22,316 INFO L225 Difference]: With dead ends: 54 [2020-08-19 01:16:22,316 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 01:16:22,317 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:16:22,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 01:16:22,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-19 01:16:22,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 01:16:22,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-19 01:16:22,327 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-19 01:16:22,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:22,327 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-19 01:16:22,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 01:16:22,327 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-19 01:16:22,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 01:16:22,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:22,330 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:22,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 01:16:22,331 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:22,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:22,332 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-19 01:16:22,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:22,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639716167] [2020-08-19 01:16:22,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:22,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:22,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,532 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:22,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639716167] [2020-08-19 01:16:22,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:22,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 01:16:22,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727323600] [2020-08-19 01:16:22,535 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 01:16:22,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:22,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 01:16:22,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:16:22,537 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-19 01:16:22,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:22,735 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-19 01:16:22,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 01:16:22,736 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-19 01:16:22,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:22,737 INFO L225 Difference]: With dead ends: 58 [2020-08-19 01:16:22,737 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 01:16:22,738 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-19 01:16:22,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 01:16:22,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-19 01:16:22,742 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 01:16:22,743 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-19 01:16:22,743 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-19 01:16:22,744 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:22,744 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-19 01:16:22,744 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 01:16:22,744 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-19 01:16:22,745 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 01:16:22,745 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:22,745 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:22,745 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 01:16:22,745 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:22,746 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:22,746 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-19 01:16:22,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:22,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485476222] [2020-08-19 01:16:22,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:22,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:22,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,939 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:22,939 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485476222] [2020-08-19 01:16:22,940 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:22,940 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 01:16:22,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [960893492] [2020-08-19 01:16:22,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 01:16:22,941 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:22,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 01:16:22,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-19 01:16:22,941 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-19 01:16:23,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:23,189 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-19 01:16:23,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 01:16:23,189 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-19 01:16:23,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:23,190 INFO L225 Difference]: With dead ends: 62 [2020-08-19 01:16:23,191 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 01:16:23,191 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:16:23,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 01:16:23,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-19 01:16:23,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 01:16:23,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-19 01:16:23,202 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-19 01:16:23,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:23,202 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-19 01:16:23,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 01:16:23,202 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-19 01:16:23,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 01:16:23,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:23,206 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:23,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 01:16:23,207 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:23,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:23,208 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-19 01:16:23,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:23,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1241926642] [2020-08-19 01:16:23,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:23,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:23,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:23,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:23,428 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:23,429 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1241926642] [2020-08-19 01:16:23,429 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:23,429 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 01:16:23,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353618795] [2020-08-19 01:16:23,430 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 01:16:23,430 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:23,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 01:16:23,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:16:23,431 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-19 01:16:23,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:23,690 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-19 01:16:23,691 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 01:16:23,691 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-19 01:16:23,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:23,693 INFO L225 Difference]: With dead ends: 66 [2020-08-19 01:16:23,693 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 01:16:23,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-19 01:16:23,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 01:16:23,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-19 01:16:23,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 01:16:23,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-19 01:16:23,707 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-19 01:16:23,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:23,707 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-19 01:16:23,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 01:16:23,707 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-19 01:16:23,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 01:16:23,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:23,710 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:23,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 01:16:23,710 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:23,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:23,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-19 01:16:23,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:23,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668106753] [2020-08-19 01:16:23,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:23,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:23,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:23,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:23,988 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:23,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668106753] [2020-08-19 01:16:23,989 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:23,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 01:16:23,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969072932] [2020-08-19 01:16:23,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 01:16:23,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:23,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 01:16:23,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-19 01:16:23,991 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-19 01:16:24,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:24,354 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-19 01:16:24,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 01:16:24,354 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-19 01:16:24,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:24,355 INFO L225 Difference]: With dead ends: 70 [2020-08-19 01:16:24,355 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 01:16:24,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-19 01:16:24,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 01:16:24,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-19 01:16:24,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 01:16:24,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-19 01:16:24,361 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-19 01:16:24,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:24,362 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-19 01:16:24,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 01:16:24,362 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-19 01:16:24,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 01:16:24,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:24,363 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:24,363 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 01:16:24,363 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:24,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:24,363 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-19 01:16:24,364 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:24,364 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1340419420] [2020-08-19 01:16:24,364 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:24,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:24,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:24,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:24,626 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:24,627 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1340419420] [2020-08-19 01:16:24,627 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:24,627 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 01:16:24,627 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258915095] [2020-08-19 01:16:24,628 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 01:16:24,628 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:24,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 01:16:24,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-19 01:16:24,629 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-19 01:16:25,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:25,023 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-19 01:16:25,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 01:16:25,025 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 01:16:25,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:25,025 INFO L225 Difference]: With dead ends: 74 [2020-08-19 01:16:25,025 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 01:16:25,026 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-19 01:16:25,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 01:16:25,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-19 01:16:25,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 01:16:25,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-19 01:16:25,032 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-19 01:16:25,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:25,032 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-19 01:16:25,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 01:16:25,033 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-19 01:16:25,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 01:16:25,033 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:25,033 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:25,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 01:16:25,034 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:25,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:25,034 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-19 01:16:25,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:25,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [153743850] [2020-08-19 01:16:25,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:25,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:25,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:25,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:25,296 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:25,296 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [153743850] [2020-08-19 01:16:25,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:25,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 01:16:25,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526881324] [2020-08-19 01:16:25,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 01:16:25,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:25,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 01:16:25,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-19 01:16:25,300 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-19 01:16:25,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:25,689 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-19 01:16:25,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 01:16:25,689 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-19 01:16:25,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:25,690 INFO L225 Difference]: With dead ends: 78 [2020-08-19 01:16:25,690 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 01:16:25,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-19 01:16:25,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 01:16:25,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-19 01:16:25,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 01:16:25,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-19 01:16:25,701 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-19 01:16:25,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:25,701 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-19 01:16:25,701 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 01:16:25,701 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-19 01:16:25,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 01:16:25,702 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:25,702 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:25,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 01:16:25,704 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:25,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:25,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-19 01:16:25,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:25,705 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104316598] [2020-08-19 01:16:25,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:25,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:26,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:26,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:26,010 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:26,011 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104316598] [2020-08-19 01:16:26,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:26,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 01:16:26,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [152267642] [2020-08-19 01:16:26,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 01:16:26,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:26,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 01:16:26,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-19 01:16:26,014 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-19 01:16:26,417 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:26,418 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-19 01:16:26,418 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 01:16:26,419 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-19 01:16:26,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:26,419 INFO L225 Difference]: With dead ends: 82 [2020-08-19 01:16:26,419 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 01:16:26,420 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-19 01:16:26,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 01:16:26,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-19 01:16:26,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 01:16:26,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-19 01:16:26,427 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-19 01:16:26,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:26,427 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-19 01:16:26,427 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 01:16:26,427 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-19 01:16:26,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 01:16:26,428 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:26,428 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:26,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 01:16:26,428 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:26,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:26,429 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-19 01:16:26,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:26,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [419003417] [2020-08-19 01:16:26,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:26,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:26,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:26,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:26,766 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:26,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [419003417] [2020-08-19 01:16:26,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:26,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 01:16:26,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237956601] [2020-08-19 01:16:26,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 01:16:26,771 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:26,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 01:16:26,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-19 01:16:26,779 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-19 01:16:27,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:27,284 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-19 01:16:27,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 01:16:27,284 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-19 01:16:27,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:27,285 INFO L225 Difference]: With dead ends: 86 [2020-08-19 01:16:27,285 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 01:16:27,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-19 01:16:27,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 01:16:27,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-19 01:16:27,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 01:16:27,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-19 01:16:27,291 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-19 01:16:27,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:27,291 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-19 01:16:27,292 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 01:16:27,292 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-19 01:16:27,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 01:16:27,292 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:27,292 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:27,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 01:16:27,293 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:27,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:27,293 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-19 01:16:27,293 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:27,294 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182836507] [2020-08-19 01:16:27,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:27,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:27,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:27,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:27,611 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:27,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182836507] [2020-08-19 01:16:27,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:27,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 01:16:27,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1291914256] [2020-08-19 01:16:27,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 01:16:27,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:27,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 01:16:27,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-19 01:16:27,613 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-19 01:16:28,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:28,220 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-19 01:16:28,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 01:16:28,221 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-19 01:16:28,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:28,222 INFO L225 Difference]: With dead ends: 90 [2020-08-19 01:16:28,222 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 01:16:28,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-19 01:16:28,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 01:16:28,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-19 01:16:28,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 01:16:28,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-19 01:16:28,228 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-19 01:16:28,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:28,229 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-19 01:16:28,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 01:16:28,229 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-19 01:16:28,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 01:16:28,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:28,230 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:28,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 01:16:28,230 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:28,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:28,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-19 01:16:28,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:28,231 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107162015] [2020-08-19 01:16:28,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:28,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:28,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:28,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:28,638 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:28,639 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107162015] [2020-08-19 01:16:28,639 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:28,639 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 01:16:28,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [204172322] [2020-08-19 01:16:28,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 01:16:28,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:28,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 01:16:28,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-19 01:16:28,641 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-19 01:16:29,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:29,194 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-19 01:16:29,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 01:16:29,195 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-19 01:16:29,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:29,196 INFO L225 Difference]: With dead ends: 94 [2020-08-19 01:16:29,196 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 01:16:29,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:16:29,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 01:16:29,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-19 01:16:29,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 01:16:29,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-19 01:16:29,201 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-19 01:16:29,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:29,201 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-19 01:16:29,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 01:16:29,202 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-19 01:16:29,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 01:16:29,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:29,202 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:29,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 01:16:29,203 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:29,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:29,203 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-19 01:16:29,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:29,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1896779700] [2020-08-19 01:16:29,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:29,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:29,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:29,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:29,659 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:29,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1896779700] [2020-08-19 01:16:29,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:29,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 01:16:29,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1127489043] [2020-08-19 01:16:29,661 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 01:16:29,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:29,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 01:16:29,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:16:29,662 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-19 01:16:30,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:30,239 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-19 01:16:30,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 01:16:30,239 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-19 01:16:30,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:30,240 INFO L225 Difference]: With dead ends: 98 [2020-08-19 01:16:30,240 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 01:16:30,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-19 01:16:30,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 01:16:30,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-19 01:16:30,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 01:16:30,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-19 01:16:30,251 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-19 01:16:30,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:30,256 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-19 01:16:30,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 01:16:30,256 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-19 01:16:30,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 01:16:30,256 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:30,257 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:30,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 01:16:30,257 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:30,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:30,257 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-19 01:16:30,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:30,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058011450] [2020-08-19 01:16:30,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:30,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:30,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:30,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:30,705 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:30,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058011450] [2020-08-19 01:16:30,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:30,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 01:16:30,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948242011] [2020-08-19 01:16:30,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 01:16:30,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:30,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 01:16:30,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-19 01:16:30,708 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-19 01:16:31,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:31,592 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-19 01:16:31,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 01:16:31,596 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-19 01:16:31,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:31,597 INFO L225 Difference]: With dead ends: 102 [2020-08-19 01:16:31,597 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 01:16:31,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-19 01:16:31,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 01:16:31,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-19 01:16:31,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 01:16:31,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-19 01:16:31,608 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-19 01:16:31,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:31,608 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-19 01:16:31,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 01:16:31,609 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-19 01:16:31,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 01:16:31,609 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:31,609 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:31,609 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 01:16:31,610 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:31,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:31,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-19 01:16:31,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:31,610 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267354566] [2020-08-19 01:16:31,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:31,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:32,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:32,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:32,099 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:32,100 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267354566] [2020-08-19 01:16:32,100 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:32,100 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 01:16:32,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1578346109] [2020-08-19 01:16:32,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 01:16:32,101 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:32,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 01:16:32,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-19 01:16:32,101 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-19 01:16:32,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:32,895 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-19 01:16:32,896 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 01:16:32,896 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-19 01:16:32,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:32,897 INFO L225 Difference]: With dead ends: 106 [2020-08-19 01:16:32,897 INFO L226 Difference]: Without dead ends: 59 [2020-08-19 01:16:32,898 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-19 01:16:32,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-19 01:16:32,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-19 01:16:32,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 01:16:32,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-19 01:16:32,902 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-19 01:16:32,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:32,903 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-19 01:16:32,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 01:16:32,903 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-19 01:16:32,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 01:16:32,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:32,904 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:32,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 01:16:32,904 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:32,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:32,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-19 01:16:32,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:32,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1072154643] [2020-08-19 01:16:32,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:32,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:33,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:33,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:33,426 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:33,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1072154643] [2020-08-19 01:16:33,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:33,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 01:16:33,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [602108497] [2020-08-19 01:16:33,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 01:16:33,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:33,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 01:16:33,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-19 01:16:33,428 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-19 01:16:34,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:34,278 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-19 01:16:34,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 01:16:34,280 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-19 01:16:34,280 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:34,281 INFO L225 Difference]: With dead ends: 110 [2020-08-19 01:16:34,281 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 01:16:34,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-19 01:16:34,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 01:16:34,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-19 01:16:34,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 01:16:34,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-19 01:16:34,286 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-19 01:16:34,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:34,286 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-19 01:16:34,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 01:16:34,287 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-19 01:16:34,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 01:16:34,287 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:34,287 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:34,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 01:16:34,288 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:34,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:34,288 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-19 01:16:34,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:34,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [260009370] [2020-08-19 01:16:34,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:34,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:34,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:34,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:34,868 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:34,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [260009370] [2020-08-19 01:16:34,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:34,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 01:16:34,869 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002308784] [2020-08-19 01:16:34,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 01:16:34,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:34,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 01:16:34,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-19 01:16:34,870 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-19 01:16:35,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:35,730 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-19 01:16:35,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 01:16:35,730 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-19 01:16:35,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:35,731 INFO L225 Difference]: With dead ends: 114 [2020-08-19 01:16:35,731 INFO L226 Difference]: Without dead ends: 63 [2020-08-19 01:16:35,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-19 01:16:35,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-19 01:16:35,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-19 01:16:35,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-19 01:16:35,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-19 01:16:35,737 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-19 01:16:35,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:35,737 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-19 01:16:35,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 01:16:35,737 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-19 01:16:35,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-19 01:16:35,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:35,738 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:35,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 01:16:35,738 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:35,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:35,739 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-19 01:16:35,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:35,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1689294194] [2020-08-19 01:16:35,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:35,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:36,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:36,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:36,388 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:36,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1689294194] [2020-08-19 01:16:36,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:36,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 01:16:36,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101054314] [2020-08-19 01:16:36,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 01:16:36,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:36,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 01:16:36,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-19 01:16:36,390 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-19 01:16:37,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:37,333 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-19 01:16:37,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 01:16:37,337 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-19 01:16:37,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:37,338 INFO L225 Difference]: With dead ends: 118 [2020-08-19 01:16:37,338 INFO L226 Difference]: Without dead ends: 65 [2020-08-19 01:16:37,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-19 01:16:37,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-19 01:16:37,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-19 01:16:37,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-19 01:16:37,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-19 01:16:37,346 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-19 01:16:37,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:37,347 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-19 01:16:37,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 01:16:37,347 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-19 01:16:37,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-19 01:16:37,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:37,348 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:37,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 01:16:37,348 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:37,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:37,349 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-19 01:16:37,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:37,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723182195] [2020-08-19 01:16:37,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:37,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:37,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:37,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:37,987 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:37,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723182195] [2020-08-19 01:16:37,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:37,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 01:16:37,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723236413] [2020-08-19 01:16:37,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 01:16:37,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:37,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 01:16:37,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-19 01:16:37,989 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-19 01:16:39,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:39,050 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-19 01:16:39,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 01:16:39,050 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-19 01:16:39,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:39,051 INFO L225 Difference]: With dead ends: 122 [2020-08-19 01:16:39,051 INFO L226 Difference]: Without dead ends: 67 [2020-08-19 01:16:39,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-19 01:16:39,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-19 01:16:39,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-19 01:16:39,056 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-19 01:16:39,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-19 01:16:39,057 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-19 01:16:39,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:39,057 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-19 01:16:39,057 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 01:16:39,057 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-19 01:16:39,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-19 01:16:39,058 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:39,058 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:39,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 01:16:39,058 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:39,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:39,059 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-19 01:16:39,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:39,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [600684094] [2020-08-19 01:16:39,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:39,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:39,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:39,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:39,724 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:39,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [600684094] [2020-08-19 01:16:39,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:39,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 01:16:39,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [427286871] [2020-08-19 01:16:39,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 01:16:39,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:39,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 01:16:39,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-19 01:16:39,726 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-19 01:16:40,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:40,827 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-19 01:16:40,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 01:16:40,831 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-19 01:16:40,831 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:40,832 INFO L225 Difference]: With dead ends: 126 [2020-08-19 01:16:40,832 INFO L226 Difference]: Without dead ends: 69 [2020-08-19 01:16:40,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-19 01:16:40,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-19 01:16:40,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-19 01:16:40,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-19 01:16:40,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-19 01:16:40,838 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-19 01:16:40,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:40,838 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-19 01:16:40,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 01:16:40,838 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-19 01:16:40,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-19 01:16:40,839 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:40,839 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:40,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 01:16:40,839 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:40,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:40,840 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-19 01:16:40,840 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:40,840 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066364339] [2020-08-19 01:16:40,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:40,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:41,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,545 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:41,546 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066364339] [2020-08-19 01:16:41,546 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:41,546 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 01:16:41,546 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1002802096] [2020-08-19 01:16:41,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 01:16:41,547 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:41,547 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 01:16:41,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-19 01:16:41,547 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-19 01:16:42,824 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:42,824 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-19 01:16:42,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 01:16:42,828 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-19 01:16:42,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:42,828 INFO L225 Difference]: With dead ends: 130 [2020-08-19 01:16:42,829 INFO L226 Difference]: Without dead ends: 71 [2020-08-19 01:16:42,829 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-19 01:16:42,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-19 01:16:42,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-19 01:16:42,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-19 01:16:42,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-19 01:16:42,834 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-19 01:16:42,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:42,835 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-19 01:16:42,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 01:16:42,835 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-19 01:16:42,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-19 01:16:42,835 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:42,836 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:42,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 01:16:42,836 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:42,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:42,836 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-19 01:16:42,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:42,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931525057] [2020-08-19 01:16:42,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:42,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:43,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:43,596 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:43,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931525057] [2020-08-19 01:16:43,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:43,597 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 01:16:43,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048607364] [2020-08-19 01:16:43,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 01:16:43,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:43,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 01:16:43,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-19 01:16:43,599 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-19 01:16:44,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:44,895 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-19 01:16:44,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 01:16:44,895 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-19 01:16:44,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:44,896 INFO L225 Difference]: With dead ends: 134 [2020-08-19 01:16:44,896 INFO L226 Difference]: Without dead ends: 73 [2020-08-19 01:16:44,897 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-19 01:16:44,898 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-19 01:16:44,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-19 01:16:44,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-19 01:16:44,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-19 01:16:44,902 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-19 01:16:44,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:44,903 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-19 01:16:44,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 01:16:44,903 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-19 01:16:44,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-19 01:16:44,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:44,904 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:44,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 01:16:44,904 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:44,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:44,904 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-19 01:16:44,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:44,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [671466860] [2020-08-19 01:16:44,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:44,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:45,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:45,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:45,726 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:45,726 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [671466860] [2020-08-19 01:16:45,726 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:45,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 01:16:45,727 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1404805633] [2020-08-19 01:16:45,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 01:16:45,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:45,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 01:16:45,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-19 01:16:45,728 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-19 01:16:47,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:47,056 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-19 01:16:47,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 01:16:47,057 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-19 01:16:47,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:47,058 INFO L225 Difference]: With dead ends: 138 [2020-08-19 01:16:47,058 INFO L226 Difference]: Without dead ends: 75 [2020-08-19 01:16:47,058 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-19 01:16:47,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-19 01:16:47,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-19 01:16:47,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-19 01:16:47,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-19 01:16:47,063 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-19 01:16:47,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:47,064 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-19 01:16:47,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 01:16:47,064 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-19 01:16:47,064 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-19 01:16:47,064 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:47,065 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:47,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 01:16:47,065 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:47,065 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:47,065 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-19 01:16:47,066 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:47,066 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069286209] [2020-08-19 01:16:47,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:47,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:47,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:47,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:47,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069286209] [2020-08-19 01:16:47,925 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:47,925 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 01:16:47,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1654945513] [2020-08-19 01:16:47,926 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 01:16:47,926 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:47,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 01:16:47,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-19 01:16:47,927 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-19 01:16:49,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:49,444 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-19 01:16:49,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 01:16:49,445 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-19 01:16:49,445 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:49,445 INFO L225 Difference]: With dead ends: 142 [2020-08-19 01:16:49,446 INFO L226 Difference]: Without dead ends: 77 [2020-08-19 01:16:49,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 01:16:49,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-19 01:16:49,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-19 01:16:49,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-19 01:16:49,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-19 01:16:49,451 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-19 01:16:49,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:49,451 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-19 01:16:49,452 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 01:16:49,452 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-19 01:16:49,452 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-19 01:16:49,452 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:49,453 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:49,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 01:16:49,453 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:49,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:49,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-19 01:16:49,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:49,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1469443207] [2020-08-19 01:16:49,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:49,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:50,361 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:50,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:50,372 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:50,372 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1469443207] [2020-08-19 01:16:50,372 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:50,372 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 01:16:50,372 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561509065] [2020-08-19 01:16:50,373 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 01:16:50,373 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:50,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 01:16:50,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 01:16:50,374 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-19 01:16:51,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:51,957 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-19 01:16:51,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 01:16:51,958 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-19 01:16:51,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:51,959 INFO L225 Difference]: With dead ends: 146 [2020-08-19 01:16:51,959 INFO L226 Difference]: Without dead ends: 79 [2020-08-19 01:16:51,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 01:16:51,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-19 01:16:51,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-19 01:16:51,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-19 01:16:51,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-19 01:16:51,966 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-19 01:16:51,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:51,966 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-19 01:16:51,966 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 01:16:51,966 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-19 01:16:51,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-19 01:16:51,967 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:51,967 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:51,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 01:16:51,968 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:51,968 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:51,968 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-19 01:16:51,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:51,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1270870934] [2020-08-19 01:16:51,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:52,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:52,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:52,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:52,931 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:52,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1270870934] [2020-08-19 01:16:52,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:52,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 01:16:52,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219603259] [2020-08-19 01:16:52,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 01:16:52,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:52,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 01:16:52,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 01:16:52,934 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-19 01:16:54,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:54,584 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-19 01:16:54,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 01:16:54,585 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-19 01:16:54,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:54,586 INFO L225 Difference]: With dead ends: 150 [2020-08-19 01:16:54,586 INFO L226 Difference]: Without dead ends: 81 [2020-08-19 01:16:54,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 01:16:54,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-19 01:16:54,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-19 01:16:54,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-19 01:16:54,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-19 01:16:54,593 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-19 01:16:54,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:54,593 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-19 01:16:54,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 01:16:54,593 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-19 01:16:54,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-19 01:16:54,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:54,594 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:54,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 01:16:54,595 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:54,595 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:54,595 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-19 01:16:54,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:54,596 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2027480291] [2020-08-19 01:16:54,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:54,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:55,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:55,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:55,580 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:55,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2027480291] [2020-08-19 01:16:55,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:55,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 01:16:55,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160879276] [2020-08-19 01:16:55,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 01:16:55,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:55,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 01:16:55,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 01:16:55,582 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-19 01:16:57,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:57,352 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-19 01:16:57,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 01:16:57,353 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-19 01:16:57,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:57,354 INFO L225 Difference]: With dead ends: 154 [2020-08-19 01:16:57,354 INFO L226 Difference]: Without dead ends: 83 [2020-08-19 01:16:57,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 01:16:57,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-19 01:16:57,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-19 01:16:57,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-19 01:16:57,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-19 01:16:57,360 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-19 01:16:57,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:57,360 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-19 01:16:57,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 01:16:57,360 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-19 01:16:57,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-19 01:16:57,361 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:57,361 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:16:57,361 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 01:16:57,362 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:57,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:57,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-19 01:16:57,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:57,362 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1933733001] [2020-08-19 01:16:57,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:57,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:58,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:58,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:58,393 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:16:58,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1933733001] [2020-08-19 01:16:58,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:58,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 01:16:58,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928778587] [2020-08-19 01:16:58,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 01:16:58,394 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:58,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 01:16:58,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 01:16:58,395 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-19 01:17:00,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:00,204 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-19 01:17:00,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 01:17:00,205 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-19 01:17:00,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:00,206 INFO L225 Difference]: With dead ends: 158 [2020-08-19 01:17:00,206 INFO L226 Difference]: Without dead ends: 85 [2020-08-19 01:17:00,207 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 01:17:00,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-19 01:17:00,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-19 01:17:00,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-19 01:17:00,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-19 01:17:00,211 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-19 01:17:00,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:00,212 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-19 01:17:00,212 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 01:17:00,212 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-19 01:17:00,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-19 01:17:00,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:00,213 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:00,213 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 01:17:00,213 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:00,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:00,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-19 01:17:00,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:00,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [714762783] [2020-08-19 01:17:00,213 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:00,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:01,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:01,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:01,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:01,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [714762783] [2020-08-19 01:17:01,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:01,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 01:17:01,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646468146] [2020-08-19 01:17:01,326 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 01:17:01,326 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:01,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 01:17:01,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 01:17:01,327 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-19 01:17:03,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:03,223 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-19 01:17:03,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 01:17:03,225 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-19 01:17:03,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:03,226 INFO L225 Difference]: With dead ends: 162 [2020-08-19 01:17:03,226 INFO L226 Difference]: Without dead ends: 87 [2020-08-19 01:17:03,227 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 01:17:03,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-19 01:17:03,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-19 01:17:03,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-19 01:17:03,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-19 01:17:03,232 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-19 01:17:03,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:03,233 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-19 01:17:03,233 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 01:17:03,233 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-19 01:17:03,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-19 01:17:03,234 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:03,234 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:03,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 01:17:03,234 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:03,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:03,234 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-19 01:17:03,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:03,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [952324041] [2020-08-19 01:17:03,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:03,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:04,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:04,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:04,449 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:04,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [952324041] [2020-08-19 01:17:04,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:04,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 01:17:04,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114955482] [2020-08-19 01:17:04,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 01:17:04,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:04,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 01:17:04,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 01:17:04,451 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-19 01:17:06,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:06,554 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-19 01:17:06,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 01:17:06,555 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-19 01:17:06,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:06,555 INFO L225 Difference]: With dead ends: 166 [2020-08-19 01:17:06,555 INFO L226 Difference]: Without dead ends: 89 [2020-08-19 01:17:06,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 01:17:06,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-19 01:17:06,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-19 01:17:06,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-19 01:17:06,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-19 01:17:06,561 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-19 01:17:06,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:06,562 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-19 01:17:06,562 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 01:17:06,562 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-19 01:17:06,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-19 01:17:06,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:06,563 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:06,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 01:17:06,563 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:06,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:06,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-19 01:17:06,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:06,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [642568048] [2020-08-19 01:17:06,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:06,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:07,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:07,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:07,956 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:07,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [642568048] [2020-08-19 01:17:07,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:07,957 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 01:17:07,957 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1230629012] [2020-08-19 01:17:07,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 01:17:07,958 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:07,958 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 01:17:07,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 01:17:07,958 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-19 01:17:10,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:10,073 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-19 01:17:10,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 01:17:10,074 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-19 01:17:10,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:10,075 INFO L225 Difference]: With dead ends: 170 [2020-08-19 01:17:10,075 INFO L226 Difference]: Without dead ends: 91 [2020-08-19 01:17:10,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 01:17:10,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-19 01:17:10,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-19 01:17:10,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-19 01:17:10,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-19 01:17:10,083 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-19 01:17:10,083 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:10,084 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-19 01:17:10,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 01:17:10,084 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-19 01:17:10,084 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-19 01:17:10,084 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:10,085 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:10,085 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 01:17:10,085 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:10,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:10,085 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-19 01:17:10,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:10,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1444879085] [2020-08-19 01:17:10,086 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:10,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:11,473 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:11,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:11,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:11,486 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1444879085] [2020-08-19 01:17:11,486 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:11,486 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 01:17:11,487 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785203768] [2020-08-19 01:17:11,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 01:17:11,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:11,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 01:17:11,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 01:17:11,489 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-19 01:17:13,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:13,681 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-19 01:17:13,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 01:17:13,682 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-19 01:17:13,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:13,684 INFO L225 Difference]: With dead ends: 174 [2020-08-19 01:17:13,684 INFO L226 Difference]: Without dead ends: 93 [2020-08-19 01:17:13,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 01:17:13,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-19 01:17:13,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-19 01:17:13,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-19 01:17:13,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-19 01:17:13,692 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-19 01:17:13,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:13,692 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-19 01:17:13,692 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 01:17:13,692 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-19 01:17:13,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-19 01:17:13,693 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:13,693 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:13,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 01:17:13,694 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:13,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:13,694 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-19 01:17:13,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:13,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1305259355] [2020-08-19 01:17:13,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:13,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:15,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:15,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:15,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:15,111 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1305259355] [2020-08-19 01:17:15,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:15,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 01:17:15,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197424475] [2020-08-19 01:17:15,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 01:17:15,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:15,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 01:17:15,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 01:17:15,113 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-19 01:17:17,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:17:17,596 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-19 01:17:17,598 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 01:17:17,598 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-19 01:17:17,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:17:17,599 INFO L225 Difference]: With dead ends: 178 [2020-08-19 01:17:17,599 INFO L226 Difference]: Without dead ends: 95 [2020-08-19 01:17:17,600 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 01:17:17,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-19 01:17:17,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-19 01:17:17,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-19 01:17:17,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-19 01:17:17,612 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-19 01:17:17,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:17:17,612 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-19 01:17:17,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 01:17:17,612 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-19 01:17:17,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-19 01:17:17,613 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:17:17,613 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 01:17:17,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 01:17:17,613 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:17:17,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:17:17,619 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-19 01:17:17,619 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:17:17,619 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263788731] [2020-08-19 01:17:17,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:17:17,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:19,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:17:19,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:17:19,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1446 backedges. 2 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:17:19,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263788731] [2020-08-19 01:17:19,131 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:17:19,131 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 01:17:19,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180129741] [2020-08-19 01:17:19,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 01:17:19,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:17:19,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 01:17:19,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=1603, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 01:17:19,133 INFO L87 Difference]: Start difference. First operand 92 states and 94 transitions. Second operand 42 states.