/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 01:32:34,791 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 01:32:34,795 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 01:32:34,836 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 01:32:34,837 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 01:32:34,848 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 01:32:34,850 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 01:32:34,852 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 01:32:34,855 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 01:32:34,859 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 01:32:34,860 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 01:32:34,862 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 01:32:34,862 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 01:32:34,864 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 01:32:34,865 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 01:32:34,866 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 01:32:34,867 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 01:32:34,869 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 01:32:34,870 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 01:32:34,876 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 01:32:34,878 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 01:32:34,879 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 01:32:34,883 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 01:32:34,883 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 01:32:34,886 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 01:32:34,900 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 01:32:34,901 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 01:32:34,902 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 01:32:34,903 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 [2020-08-22 01:32:34,947 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 01:32:34,947 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 01:32:34,949 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 01:32:34,950 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 01:32:34,950 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 01:32:34,950 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 01:32:34,950 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 01:32:34,951 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 01:32:34,951 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 01:32:34,951 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 01:32:34,952 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 01:32:34,952 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 01:32:34,952 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 01:32:34,953 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 01:32:34,953 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 01:32:34,953 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 01:32:34,953 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 01:32:34,954 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 01:32:34,954 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 01:32:34,954 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 01:32:34,954 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 01:32:34,954 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 01:32:34,955 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 01:32:34,955 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 01:32:34,955 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 01:32:34,955 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 01:32:34,955 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 01:32:34,956 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 01:32:34,956 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 01:32:34,956 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; [2020-08-22 01:32:35,247 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 01:32:35,260 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 01:32:35,264 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 01:32:35,265 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 01:32:35,266 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 01:32:35,266 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 01:32:35,331 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/64ef3d411/49c3fa038738433791623293f2d4c9a9/FLAG33e5aff8d [2020-08-22 01:32:35,799 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 01:32:35,800 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-22 01:32:35,806 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/64ef3d411/49c3fa038738433791623293f2d4c9a9/FLAG33e5aff8d [2020-08-22 01:32:36,179 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/64ef3d411/49c3fa038738433791623293f2d4c9a9 [2020-08-22 01:32:36,189 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 01:32:36,191 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 01:32:36,192 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 01:32:36,193 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 01:32:36,196 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 01:32:36,197 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,200 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@c9f74a0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36, skipping insertion in model container [2020-08-22 01:32:36,200 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,208 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 01:32:36,226 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 01:32:36,445 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 01:32:36,548 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 01:32:36,580 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 01:32:36,748 INFO L208 MainTranslator]: Completed translation [2020-08-22 01:32:36,750 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36 WrapperNode [2020-08-22 01:32:36,750 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 01:32:36,751 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 01:32:36,751 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 01:32:36,752 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 01:32:36,764 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,766 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,776 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,776 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,799 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,805 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,807 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (1/1) ... [2020-08-22 01:32:36,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 01:32:36,809 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 01:32:36,809 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 01:32:36,810 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 01:32:36,810 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (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 [2020-08-22 01:32:36,863 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 01:32:36,863 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 01:32:36,863 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 01:32:36,864 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 01:32:36,864 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 01:32:36,864 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-22 01:32:36,864 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-22 01:32:36,864 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 01:32:36,864 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-22 01:32:36,865 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-22 01:32:36,865 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 01:32:36,865 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 01:32:37,115 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 01:32:37,115 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 01:32:37,119 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 01:32:37 BoogieIcfgContainer [2020-08-22 01:32:37,119 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 01:32:37,121 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 01:32:37,121 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 01:32:37,124 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 01:32:37,124 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 01:32:36" (1/3) ... [2020-08-22 01:32:37,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38b322af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 01:32:37, skipping insertion in model container [2020-08-22 01:32:37,125 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:36" (2/3) ... [2020-08-22 01:32:37,125 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@38b322af and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 01:32:37, skipping insertion in model container [2020-08-22 01:32:37,126 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 01:32:37" (3/3) ... [2020-08-22 01:32:37,127 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-22 01:32:37,142 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 01:32:37,162 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 01:32:37,200 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 01:32:37,242 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 01:32:37,242 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 01:32:37,242 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 01:32:37,243 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 01:32:37,244 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 01:32:37,244 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 01:32:37,244 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 01:32:37,244 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 01:32:37,261 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-22 01:32:37,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 01:32:37,266 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:37,267 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:37,268 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:37,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:37,272 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-22 01:32:37,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:37,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1371101053] [2020-08-22 01:32:37,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:37,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:37,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:37,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:37,511 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:37,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1371101053] [2020-08-22 01:32:37,514 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 01:32:37,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 01:32:37,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [409090905] [2020-08-22 01:32:37,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 01:32:37,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:37,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 01:32:37,536 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 01:32:37,538 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-22 01:32:37,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:37,631 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-22 01:32:37,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 01:32:37,634 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-22 01:32:37,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:37,643 INFO L225 Difference]: With dead ends: 42 [2020-08-22 01:32:37,644 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 01:32:37,647 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 [2020-08-22 01:32:37,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 01:32:37,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-22 01:32:37,685 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 01:32:37,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 01:32:37,687 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-22 01:32:37,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:37,688 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 01:32:37,688 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 01:32:37,688 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 01:32:37,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-22 01:32:37,689 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:37,689 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:37,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 01:32:37,690 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:37,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:37,690 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-22 01:32:37,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:37,691 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028995887] [2020-08-22 01:32:37,691 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:37,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:37,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:37,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:37,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:37,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028995887] [2020-08-22 01:32:37,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 01:32:37,797 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 01:32:37,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298857766] [2020-08-22 01:32:37,799 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 01:32:37,799 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:37,799 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 01:32:37,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 01:32:37,800 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-22 01:32:37,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:37,911 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-22 01:32:37,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 01:32:37,912 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-22 01:32:37,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:37,913 INFO L225 Difference]: With dead ends: 36 [2020-08-22 01:32:37,914 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 01:32:37,915 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 [2020-08-22 01:32:37,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 01:32:37,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-22 01:32:37,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 01:32:37,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-22 01:32:37,922 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-22 01:32:37,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:37,922 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-22 01:32:37,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 01:32:37,923 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-22 01:32:37,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 01:32:37,923 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:37,923 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:37,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 01:32:37,924 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:37,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:37,924 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-22 01:32:37,924 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:37,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2112148205] [2020-08-22 01:32:37,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:37,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:38,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,028 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:38,028 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2112148205] [2020-08-22 01:32:38,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 01:32:38,029 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 01:32:38,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797171716] [2020-08-22 01:32:38,033 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 01:32:38,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:38,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 01:32:38,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 01:32:38,034 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-22 01:32:38,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:38,140 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-22 01:32:38,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 01:32:38,141 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-22 01:32:38,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:38,142 INFO L225 Difference]: With dead ends: 40 [2020-08-22 01:32:38,142 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 01:32:38,143 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 [2020-08-22 01:32:38,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 01:32:38,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-22 01:32:38,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 01:32:38,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-22 01:32:38,150 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-22 01:32:38,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:38,150 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-22 01:32:38,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 01:32:38,151 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-22 01:32:38,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 01:32:38,152 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:38,152 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:38,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 01:32:38,152 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:38,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:38,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-22 01:32:38,153 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:38,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [525924133] [2020-08-22 01:32:38,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:38,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:38,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,236 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:38,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [525924133] [2020-08-22 01:32:38,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 01:32:38,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 01:32:38,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050737298] [2020-08-22 01:32:38,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 01:32:38,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:38,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 01:32:38,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 01:32:38,243 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-22 01:32:38,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:38,333 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-22 01:32:38,333 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 01:32:38,334 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-22 01:32:38,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:38,335 INFO L225 Difference]: With dead ends: 31 [2020-08-22 01:32:38,335 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 01:32:38,336 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 [2020-08-22 01:32:38,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 01:32:38,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-22 01:32:38,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 01:32:38,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-22 01:32:38,347 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-22 01:32:38,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:38,348 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-22 01:32:38,348 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 01:32:38,348 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-22 01:32:38,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 01:32:38,351 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:38,351 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:38,351 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 01:32:38,351 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:38,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:38,352 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-22 01:32:38,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:38,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405341485] [2020-08-22 01:32:38,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:38,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:38,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,493 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:38,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405341485] [2020-08-22 01:32:38,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:38,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 01:32:38,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140310790] [2020-08-22 01:32:38,495 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 01:32:38,495 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:38,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 01:32:38,496 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 01:32:38,496 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-22 01:32:38,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:38,570 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-22 01:32:38,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 01:32:38,571 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-22 01:32:38,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:38,572 INFO L225 Difference]: With dead ends: 34 [2020-08-22 01:32:38,572 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 01:32:38,573 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 [2020-08-22 01:32:38,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 01:32:38,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-22 01:32:38,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 01:32:38,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-22 01:32:38,579 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-22 01:32:38,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:38,579 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-22 01:32:38,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 01:32:38,579 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-22 01:32:38,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 01:32:38,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:38,580 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:38,581 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 01:32:38,581 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:38,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:38,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-22 01:32:38,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:38,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904015375] [2020-08-22 01:32:38,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:38,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:38,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,717 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:38,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904015375] [2020-08-22 01:32:38,718 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:38,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 01:32:38,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927273377] [2020-08-22 01:32:38,719 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 01:32:38,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:38,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 01:32:38,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 01:32:38,719 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-22 01:32:38,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:38,803 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-22 01:32:38,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 01:32:38,804 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-22 01:32:38,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:38,805 INFO L225 Difference]: With dead ends: 38 [2020-08-22 01:32:38,805 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 01:32:38,806 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 [2020-08-22 01:32:38,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 01:32:38,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-22 01:32:38,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 01:32:38,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-22 01:32:38,811 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-22 01:32:38,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:38,812 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-22 01:32:38,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 01:32:38,812 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-22 01:32:38,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 01:32:38,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:38,813 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:38,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 01:32:38,813 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:38,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:38,814 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-22 01:32:38,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:38,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [885499528] [2020-08-22 01:32:38,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:38,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:38,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:38,982 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:38,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [885499528] [2020-08-22 01:32:38,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:38,983 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 01:32:38,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133619227] [2020-08-22 01:32:38,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 01:32:38,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:38,984 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 01:32:38,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-22 01:32:38,985 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-22 01:32:39,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:39,083 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-22 01:32:39,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 01:32:39,083 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-22 01:32:39,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:39,084 INFO L225 Difference]: With dead ends: 42 [2020-08-22 01:32:39,084 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 01:32:39,085 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 [2020-08-22 01:32:39,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 01:32:39,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-22 01:32:39,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 01:32:39,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-22 01:32:39,091 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-22 01:32:39,091 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:39,092 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-22 01:32:39,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 01:32:39,092 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-22 01:32:39,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 01:32:39,093 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:39,093 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:39,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 01:32:39,093 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:39,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:39,094 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-22 01:32:39,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:39,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415219905] [2020-08-22 01:32:39,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:39,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:39,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:39,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:39,225 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:39,225 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415219905] [2020-08-22 01:32:39,226 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:39,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 01:32:39,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1172998075] [2020-08-22 01:32:39,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 01:32:39,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:39,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 01:32:39,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-22 01:32:39,230 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-22 01:32:39,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:39,363 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-22 01:32:39,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 01:32:39,363 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-22 01:32:39,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:39,364 INFO L225 Difference]: With dead ends: 46 [2020-08-22 01:32:39,364 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 01:32:39,365 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-22 01:32:39,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 01:32:39,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-22 01:32:39,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 01:32:39,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-22 01:32:39,373 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-22 01:32:39,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:39,373 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-22 01:32:39,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 01:32:39,373 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-22 01:32:39,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 01:32:39,375 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:39,375 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:39,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 01:32:39,375 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:39,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:39,376 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-22 01:32:39,376 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:39,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [543230876] [2020-08-22 01:32:39,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:39,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:39,546 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:39,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:39,553 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:39,554 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [543230876] [2020-08-22 01:32:39,554 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:39,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 01:32:39,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836412463] [2020-08-22 01:32:39,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 01:32:39,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:39,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 01:32:39,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-22 01:32:39,556 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-22 01:32:39,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:39,704 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-22 01:32:39,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 01:32:39,708 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-22 01:32:39,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:39,709 INFO L225 Difference]: With dead ends: 50 [2020-08-22 01:32:39,709 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 01:32:39,710 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 [2020-08-22 01:32:39,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 01:32:39,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-22 01:32:39,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 01:32:39,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-22 01:32:39,722 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-22 01:32:39,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:39,723 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-22 01:32:39,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 01:32:39,723 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-22 01:32:39,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 01:32:39,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:39,724 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:39,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 01:32:39,725 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:39,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:39,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-22 01:32:39,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:39,727 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970405879] [2020-08-22 01:32:39,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:39,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:39,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:39,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:39,946 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:39,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [970405879] [2020-08-22 01:32:39,947 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:39,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 01:32:39,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266675976] [2020-08-22 01:32:39,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 01:32:39,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:39,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 01:32:39,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-22 01:32:39,949 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-22 01:32:40,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:40,156 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-22 01:32:40,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 01:32:40,157 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-22 01:32:40,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:40,157 INFO L225 Difference]: With dead ends: 54 [2020-08-22 01:32:40,158 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 01:32:40,158 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 [2020-08-22 01:32:40,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 01:32:40,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-22 01:32:40,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 01:32:40,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-22 01:32:40,167 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-22 01:32:40,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:40,168 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-22 01:32:40,168 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 01:32:40,169 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-22 01:32:40,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 01:32:40,171 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:40,171 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:40,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 01:32:40,171 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:40,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:40,172 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-22 01:32:40,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:40,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [896026493] [2020-08-22 01:32:40,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:40,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:40,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:40,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:40,374 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:40,374 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [896026493] [2020-08-22 01:32:40,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:40,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 01:32:40,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954670625] [2020-08-22 01:32:40,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 01:32:40,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:40,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 01:32:40,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-22 01:32:40,377 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-22 01:32:40,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:40,600 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-22 01:32:40,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 01:32:40,601 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-22 01:32:40,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:40,601 INFO L225 Difference]: With dead ends: 58 [2020-08-22 01:32:40,602 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 01:32:40,602 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 [2020-08-22 01:32:40,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 01:32:40,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-22 01:32:40,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 01:32:40,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-22 01:32:40,608 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-22 01:32:40,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:40,609 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-22 01:32:40,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 01:32:40,609 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-22 01:32:40,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 01:32:40,610 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:40,610 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:40,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 01:32:40,610 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:40,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:40,611 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-22 01:32:40,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:40,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1573917013] [2020-08-22 01:32:40,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:40,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:40,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:40,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:40,803 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:40,804 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1573917013] [2020-08-22 01:32:40,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:40,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 01:32:40,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1003927022] [2020-08-22 01:32:40,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 01:32:40,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:40,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 01:32:40,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-22 01:32:40,806 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-22 01:32:41,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:41,071 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-22 01:32:41,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 01:32:41,072 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-22 01:32:41,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:41,073 INFO L225 Difference]: With dead ends: 62 [2020-08-22 01:32:41,073 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 01:32:41,076 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 [2020-08-22 01:32:41,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 01:32:41,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-22 01:32:41,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 01:32:41,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-22 01:32:41,082 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-22 01:32:41,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:41,082 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-22 01:32:41,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 01:32:41,082 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-22 01:32:41,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 01:32:41,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:41,083 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:41,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 01:32:41,084 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:41,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:41,084 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-22 01:32:41,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:41,085 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1956894009] [2020-08-22 01:32:41,085 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:41,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:41,291 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:41,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:41,311 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:41,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1956894009] [2020-08-22 01:32:41,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:41,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 01:32:41,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [661529029] [2020-08-22 01:32:41,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 01:32:41,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:41,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 01:32:41,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-22 01:32:41,314 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-22 01:32:41,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:41,540 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-22 01:32:41,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 01:32:41,541 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-22 01:32:41,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:41,542 INFO L225 Difference]: With dead ends: 66 [2020-08-22 01:32:41,542 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 01:32:41,542 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 [2020-08-22 01:32:41,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 01:32:41,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-22 01:32:41,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 01:32:41,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-22 01:32:41,548 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-22 01:32:41,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:41,548 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-22 01:32:41,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 01:32:41,548 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-22 01:32:41,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 01:32:41,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:41,549 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:41,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 01:32:41,550 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:41,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:41,550 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-22 01:32:41,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:41,550 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800046490] [2020-08-22 01:32:41,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:41,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:41,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:41,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:41,756 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:41,757 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800046490] [2020-08-22 01:32:41,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:41,757 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 01:32:41,757 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959876101] [2020-08-22 01:32:41,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 01:32:41,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:41,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 01:32:41,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-22 01:32:41,758 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-22 01:32:42,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:42,080 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-22 01:32:42,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 01:32:42,081 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-22 01:32:42,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:42,082 INFO L225 Difference]: With dead ends: 70 [2020-08-22 01:32:42,082 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 01:32:42,083 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 [2020-08-22 01:32:42,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 01:32:42,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-22 01:32:42,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 01:32:42,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-22 01:32:42,093 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-22 01:32:42,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:42,094 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-22 01:32:42,094 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 01:32:42,094 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-22 01:32:42,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 01:32:42,095 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:42,095 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:42,095 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 01:32:42,095 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:42,096 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:42,096 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-22 01:32:42,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:42,097 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1854212873] [2020-08-22 01:32:42,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:42,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:42,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:42,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:42,373 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:42,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1854212873] [2020-08-22 01:32:42,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:42,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 01:32:42,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1007268240] [2020-08-22 01:32:42,374 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 01:32:42,374 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:42,375 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 01:32:42,375 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-22 01:32:42,375 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-22 01:32:42,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:42,737 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-22 01:32:42,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 01:32:42,738 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-22 01:32:42,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:42,738 INFO L225 Difference]: With dead ends: 74 [2020-08-22 01:32:42,739 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 01:32:42,739 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 [2020-08-22 01:32:42,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 01:32:42,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-22 01:32:42,745 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 01:32:42,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-22 01:32:42,745 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-22 01:32:42,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:42,746 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-22 01:32:42,746 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 01:32:42,746 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-22 01:32:42,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 01:32:42,746 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:42,747 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:42,747 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 01:32:42,747 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:42,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:42,747 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-22 01:32:42,747 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:42,748 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [803102627] [2020-08-22 01:32:42,748 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:42,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:43,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:43,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:43,050 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:43,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [803102627] [2020-08-22 01:32:43,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:43,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 01:32:43,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896214890] [2020-08-22 01:32:43,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 01:32:43,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:43,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 01:32:43,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-22 01:32:43,053 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-22 01:32:43,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:43,446 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-22 01:32:43,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 01:32:43,447 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-22 01:32:43,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:43,448 INFO L225 Difference]: With dead ends: 78 [2020-08-22 01:32:43,448 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 01:32:43,448 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 [2020-08-22 01:32:43,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 01:32:43,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-22 01:32:43,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 01:32:43,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-22 01:32:43,455 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-22 01:32:43,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:43,456 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-22 01:32:43,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 01:32:43,456 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-22 01:32:43,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 01:32:43,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:43,457 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:43,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 01:32:43,457 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:43,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:43,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-22 01:32:43,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:43,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [316377413] [2020-08-22 01:32:43,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:43,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:43,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:43,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:43,749 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:43,750 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [316377413] [2020-08-22 01:32:43,750 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:43,750 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 01:32:43,750 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23781020] [2020-08-22 01:32:43,751 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 01:32:43,751 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:43,751 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 01:32:43,752 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-22 01:32:43,752 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-22 01:32:44,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:44,142 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-22 01:32:44,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 01:32:44,143 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-22 01:32:44,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:44,143 INFO L225 Difference]: With dead ends: 82 [2020-08-22 01:32:44,144 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 01:32:44,144 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 [2020-08-22 01:32:44,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 01:32:44,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-22 01:32:44,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 01:32:44,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-22 01:32:44,150 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-22 01:32:44,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:44,150 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-22 01:32:44,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 01:32:44,150 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-22 01:32:44,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 01:32:44,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:44,151 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:44,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 01:32:44,152 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:44,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:44,152 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-22 01:32:44,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:44,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632883042] [2020-08-22 01:32:44,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:44,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:44,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:44,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:44,488 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:44,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632883042] [2020-08-22 01:32:44,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:44,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 01:32:44,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717886975] [2020-08-22 01:32:44,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 01:32:44,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:44,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 01:32:44,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-22 01:32:44,490 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-22 01:32:45,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:45,002 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-22 01:32:45,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 01:32:45,002 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-22 01:32:45,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:45,003 INFO L225 Difference]: With dead ends: 86 [2020-08-22 01:32:45,003 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 01:32:45,004 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 [2020-08-22 01:32:45,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 01:32:45,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-22 01:32:45,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 01:32:45,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-22 01:32:45,010 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-22 01:32:45,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:45,010 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-22 01:32:45,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 01:32:45,010 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-22 01:32:45,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 01:32:45,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:45,011 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:45,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 01:32:45,012 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:45,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:45,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-22 01:32:45,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:45,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [312358645] [2020-08-22 01:32:45,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:45,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:45,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:45,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:45,358 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:45,358 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [312358645] [2020-08-22 01:32:45,358 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:45,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 01:32:45,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191605768] [2020-08-22 01:32:45,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 01:32:45,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:45,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 01:32:45,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-22 01:32:45,361 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-22 01:32:45,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:45,912 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-22 01:32:45,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 01:32:45,915 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-22 01:32:45,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:45,916 INFO L225 Difference]: With dead ends: 90 [2020-08-22 01:32:45,917 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 01:32:45,920 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 [2020-08-22 01:32:45,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 01:32:45,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-22 01:32:45,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 01:32:45,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-22 01:32:45,926 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-22 01:32:45,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:45,926 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-22 01:32:45,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 01:32:45,927 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-22 01:32:45,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 01:32:45,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:45,928 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:45,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 01:32:45,928 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:45,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:45,928 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-22 01:32:45,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:45,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937691778] [2020-08-22 01:32:45,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:45,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:46,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:46,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:46,279 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:46,279 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937691778] [2020-08-22 01:32:46,279 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:46,280 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 01:32:46,280 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488019197] [2020-08-22 01:32:46,280 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 01:32:46,280 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:46,281 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 01:32:46,281 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-22 01:32:46,281 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-22 01:32:46,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:46,869 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-22 01:32:46,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 01:32:46,870 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-22 01:32:46,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:46,871 INFO L225 Difference]: With dead ends: 94 [2020-08-22 01:32:46,871 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 01:32:46,872 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 [2020-08-22 01:32:46,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 01:32:46,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-22 01:32:46,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 01:32:46,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-22 01:32:46,880 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-22 01:32:46,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:46,881 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-22 01:32:46,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 01:32:46,882 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-22 01:32:46,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 01:32:46,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:46,883 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:46,883 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 01:32:46,883 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:46,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:46,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-22 01:32:46,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:46,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268743952] [2020-08-22 01:32:46,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:46,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:47,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:47,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:47,363 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:47,363 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268743952] [2020-08-22 01:32:47,363 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:47,363 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 01:32:47,364 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405991208] [2020-08-22 01:32:47,364 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 01:32:47,365 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:47,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 01:32:47,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-22 01:32:47,365 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-22 01:32:47,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:47,999 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-22 01:32:47,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 01:32:47,999 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-22 01:32:47,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:48,000 INFO L225 Difference]: With dead ends: 98 [2020-08-22 01:32:48,000 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 01:32:48,001 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 [2020-08-22 01:32:48,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 01:32:48,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-22 01:32:48,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 01:32:48,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-22 01:32:48,013 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-22 01:32:48,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:48,013 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-22 01:32:48,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 01:32:48,013 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-22 01:32:48,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 01:32:48,014 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:48,014 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:48,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 01:32:48,014 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:48,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:48,019 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-22 01:32:48,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:48,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949357680] [2020-08-22 01:32:48,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:48,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:48,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:48,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:48,455 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:48,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949357680] [2020-08-22 01:32:48,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:48,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 01:32:48,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [811698649] [2020-08-22 01:32:48,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 01:32:48,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:48,457 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 01:32:48,457 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-22 01:32:48,458 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-22 01:32:49,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:49,364 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-22 01:32:49,367 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 01:32:49,368 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-22 01:32:49,368 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:49,369 INFO L225 Difference]: With dead ends: 102 [2020-08-22 01:32:49,369 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 01:32:49,370 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 [2020-08-22 01:32:49,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 01:32:49,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-22 01:32:49,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 01:32:49,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-22 01:32:49,389 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-22 01:32:49,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:49,389 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-22 01:32:49,389 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 01:32:49,390 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-22 01:32:49,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 01:32:49,391 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:49,391 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:49,391 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 01:32:49,392 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:49,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:49,392 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-22 01:32:49,392 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:49,393 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [514384748] [2020-08-22 01:32:49,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:49,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:49,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:49,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:49,959 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:49,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [514384748] [2020-08-22 01:32:49,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:49,963 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 01:32:49,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136511533] [2020-08-22 01:32:49,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 01:32:49,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:49,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 01:32:49,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-22 01:32:49,966 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-22 01:32:50,723 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:50,725 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-22 01:32:50,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 01:32:50,725 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-22 01:32:50,726 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:50,726 INFO L225 Difference]: With dead ends: 106 [2020-08-22 01:32:50,726 INFO L226 Difference]: Without dead ends: 59 [2020-08-22 01:32:50,727 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 [2020-08-22 01:32:50,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-22 01:32:50,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-22 01:32:50,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 01:32:50,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-22 01:32:50,734 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-22 01:32:50,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:50,735 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-22 01:32:50,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 01:32:50,735 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-22 01:32:50,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 01:32:50,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:50,738 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:50,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 01:32:50,740 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:50,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:50,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-22 01:32:50,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:50,741 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2038259681] [2020-08-22 01:32:50,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:50,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:51,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:51,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:51,258 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:51,258 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2038259681] [2020-08-22 01:32:51,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:51,259 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 01:32:51,259 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2089084020] [2020-08-22 01:32:51,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 01:32:51,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:51,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 01:32:51,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-22 01:32:51,260 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-22 01:32:52,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:52,074 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-22 01:32:52,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 01:32:52,075 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-22 01:32:52,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:52,076 INFO L225 Difference]: With dead ends: 110 [2020-08-22 01:32:52,076 INFO L226 Difference]: Without dead ends: 61 [2020-08-22 01:32:52,077 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 [2020-08-22 01:32:52,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-22 01:32:52,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-22 01:32:52,081 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 01:32:52,082 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-22 01:32:52,082 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-22 01:32:52,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:52,082 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-22 01:32:52,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 01:32:52,082 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-22 01:32:52,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 01:32:52,083 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:52,083 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:52,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 01:32:52,084 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:52,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:52,084 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-22 01:32:52,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:52,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [945113507] [2020-08-22 01:32:52,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:52,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:52,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:52,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:52,704 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:52,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [945113507] [2020-08-22 01:32:52,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:52,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 01:32:52,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [158339018] [2020-08-22 01:32:52,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 01:32:52,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:52,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 01:32:52,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-22 01:32:52,706 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-22 01:32:53,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:53,510 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-22 01:32:53,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 01:32:53,511 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-22 01:32:53,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:53,511 INFO L225 Difference]: With dead ends: 114 [2020-08-22 01:32:53,512 INFO L226 Difference]: Without dead ends: 63 [2020-08-22 01:32:53,512 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 [2020-08-22 01:32:53,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-22 01:32:53,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-22 01:32:53,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-22 01:32:53,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-22 01:32:53,516 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-22 01:32:53,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:53,517 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-22 01:32:53,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 01:32:53,517 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-22 01:32:53,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-22 01:32:53,518 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:53,518 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:53,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 01:32:53,518 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:53,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:53,519 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-22 01:32:53,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:53,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1016396098] [2020-08-22 01:32:53,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:53,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:54,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:54,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:54,131 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:54,132 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1016396098] [2020-08-22 01:32:54,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:54,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 01:32:54,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801249353] [2020-08-22 01:32:54,133 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 01:32:54,133 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:54,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 01:32:54,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-22 01:32:54,134 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-22 01:32:55,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:55,106 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-22 01:32:55,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 01:32:55,107 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-22 01:32:55,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:55,108 INFO L225 Difference]: With dead ends: 118 [2020-08-22 01:32:55,108 INFO L226 Difference]: Without dead ends: 65 [2020-08-22 01:32:55,109 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 [2020-08-22 01:32:55,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-22 01:32:55,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-22 01:32:55,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-22 01:32:55,114 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-22 01:32:55,114 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-22 01:32:55,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:55,115 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-22 01:32:55,115 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 01:32:55,115 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-22 01:32:55,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-22 01:32:55,116 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:55,116 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:55,116 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 01:32:55,118 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:55,119 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:55,119 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-22 01:32:55,119 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:55,119 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820228779] [2020-08-22 01:32:55,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:55,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:55,682 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:55,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:55,692 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:55,693 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820228779] [2020-08-22 01:32:55,693 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:55,693 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 01:32:55,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [816485356] [2020-08-22 01:32:55,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 01:32:55,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:55,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 01:32:55,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-22 01:32:55,695 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-22 01:32:56,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:56,722 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-22 01:32:56,726 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 01:32:56,726 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-22 01:32:56,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:56,727 INFO L225 Difference]: With dead ends: 122 [2020-08-22 01:32:56,727 INFO L226 Difference]: Without dead ends: 67 [2020-08-22 01:32:56,728 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 [2020-08-22 01:32:56,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-22 01:32:56,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-22 01:32:56,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-22 01:32:56,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-22 01:32:56,732 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-22 01:32:56,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:56,733 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-22 01:32:56,733 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 01:32:56,733 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-22 01:32:56,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-22 01:32:56,733 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:56,734 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:56,734 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 01:32:56,734 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:56,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:56,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-22 01:32:56,734 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:56,734 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [680982063] [2020-08-22 01:32:56,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:56,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:57,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:57,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:57,409 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:57,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [680982063] [2020-08-22 01:32:57,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:57,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 01:32:57,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1114610538] [2020-08-22 01:32:57,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 01:32:57,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:57,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 01:32:57,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-22 01:32:57,413 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-22 01:32:58,633 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:58,633 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-22 01:32:58,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 01:32:58,634 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-22 01:32:58,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:58,635 INFO L225 Difference]: With dead ends: 126 [2020-08-22 01:32:58,636 INFO L226 Difference]: Without dead ends: 69 [2020-08-22 01:32:58,637 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-22 01:32:58,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-22 01:32:58,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-22 01:32:58,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-22 01:32:58,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-22 01:32:58,642 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-22 01:32:58,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:58,644 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-22 01:32:58,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 01:32:58,644 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-22 01:32:58,645 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-22 01:32:58,645 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:58,645 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:58,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 01:32:58,645 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:58,645 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:58,646 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-22 01:32:58,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:58,646 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785374665] [2020-08-22 01:32:58,646 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:58,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:59,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,331 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:59,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785374665] [2020-08-22 01:32:59,332 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:59,332 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 01:32:59,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195912979] [2020-08-22 01:32:59,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 01:32:59,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:59,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 01:32:59,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-22 01:32:59,333 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-22 01:33:00,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:00,775 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-22 01:33:00,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 01:33:00,781 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-22 01:33:00,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:00,782 INFO L225 Difference]: With dead ends: 130 [2020-08-22 01:33:00,782 INFO L226 Difference]: Without dead ends: 71 [2020-08-22 01:33:00,782 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 [2020-08-22 01:33:00,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-22 01:33:00,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-22 01:33:00,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-22 01:33:00,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-22 01:33:00,788 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-22 01:33:00,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:00,788 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-22 01:33:00,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 01:33:00,788 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-22 01:33:00,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-22 01:33:00,789 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:00,789 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:00,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 01:33:00,789 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:00,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:00,790 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-22 01:33:00,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:00,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [963666933] [2020-08-22 01:33:00,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:00,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:01,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:01,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:01,518 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:01,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [963666933] [2020-08-22 01:33:01,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:01,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 01:33:01,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001629868] [2020-08-22 01:33:01,519 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 01:33:01,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:01,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 01:33:01,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-22 01:33:01,520 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-22 01:33:02,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:02,913 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-22 01:33:02,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 01:33:02,914 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-22 01:33:02,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:02,915 INFO L225 Difference]: With dead ends: 134 [2020-08-22 01:33:02,915 INFO L226 Difference]: Without dead ends: 73 [2020-08-22 01:33:02,916 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 [2020-08-22 01:33:02,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-22 01:33:02,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-22 01:33:02,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-22 01:33:02,920 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-22 01:33:02,920 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-22 01:33:02,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:02,920 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-22 01:33:02,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 01:33:02,921 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-22 01:33:02,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 01:33:02,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:02,921 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:02,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 01:33:02,921 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:02,922 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:02,922 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-22 01:33:02,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:02,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1313012284] [2020-08-22 01:33:02,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:02,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:03,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:03,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:03,620 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:03,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1313012284] [2020-08-22 01:33:03,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:03,621 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 01:33:03,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [527332707] [2020-08-22 01:33:03,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 01:33:03,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:03,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 01:33:03,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-22 01:33:03,623 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-22 01:33:05,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:05,007 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-22 01:33:05,008 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 01:33:05,008 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-22 01:33:05,009 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:05,009 INFO L225 Difference]: With dead ends: 138 [2020-08-22 01:33:05,009 INFO L226 Difference]: Without dead ends: 75 [2020-08-22 01:33:05,010 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-22 01:33:05,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-22 01:33:05,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-22 01:33:05,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-22 01:33:05,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-22 01:33:05,015 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-22 01:33:05,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:05,015 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-22 01:33:05,015 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 01:33:05,016 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-22 01:33:05,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-22 01:33:05,016 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:05,016 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:05,017 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 01:33:05,017 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:05,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:05,017 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-22 01:33:05,017 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:05,018 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719205493] [2020-08-22 01:33:05,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:05,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:05,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:05,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:05,943 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:05,943 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719205493] [2020-08-22 01:33:05,944 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:05,944 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 01:33:05,944 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394490965] [2020-08-22 01:33:05,944 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 01:33:05,944 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:05,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 01:33:05,945 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-22 01:33:05,945 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-22 01:33:07,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:07,481 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-22 01:33:07,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 01:33:07,482 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-22 01:33:07,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:07,482 INFO L225 Difference]: With dead ends: 142 [2020-08-22 01:33:07,483 INFO L226 Difference]: Without dead ends: 77 [2020-08-22 01:33:07,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 01:33:07,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-22 01:33:07,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-22 01:33:07,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-22 01:33:07,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-22 01:33:07,489 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-22 01:33:07,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:07,489 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-22 01:33:07,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 01:33:07,489 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-22 01:33:07,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-22 01:33:07,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:07,490 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:07,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 01:33:07,490 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:07,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:07,490 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-22 01:33:07,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:07,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214395526] [2020-08-22 01:33:07,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:07,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:08,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:08,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:08,495 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:08,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214395526] [2020-08-22 01:33:08,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:08,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 01:33:08,496 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323507624] [2020-08-22 01:33:08,496 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 01:33:08,497 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:08,497 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 01:33:08,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 01:33:08,497 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-22 01:33:10,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:10,114 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-22 01:33:10,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 01:33:10,115 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-22 01:33:10,116 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:10,117 INFO L225 Difference]: With dead ends: 146 [2020-08-22 01:33:10,117 INFO L226 Difference]: Without dead ends: 79 [2020-08-22 01:33:10,118 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 01:33:10,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-22 01:33:10,126 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-22 01:33:10,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-22 01:33:10,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-22 01:33:10,128 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-22 01:33:10,128 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:10,128 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-22 01:33:10,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 01:33:10,128 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-22 01:33:10,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-22 01:33:10,129 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:10,129 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:10,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 01:33:10,130 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:10,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:10,130 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-22 01:33:10,130 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:10,130 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480662383] [2020-08-22 01:33:10,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:10,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:11,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:11,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:11,112 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:11,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480662383] [2020-08-22 01:33:11,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:11,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 01:33:11,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224646000] [2020-08-22 01:33:11,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 01:33:11,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:11,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 01:33:11,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 01:33:11,114 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-22 01:33:12,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:12,870 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-22 01:33:12,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 01:33:12,871 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-22 01:33:12,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:12,872 INFO L225 Difference]: With dead ends: 150 [2020-08-22 01:33:12,872 INFO L226 Difference]: Without dead ends: 81 [2020-08-22 01:33:12,873 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 01:33:12,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-22 01:33:12,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-22 01:33:12,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-22 01:33:12,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-22 01:33:12,879 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-22 01:33:12,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:12,880 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-22 01:33:12,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 01:33:12,880 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-22 01:33:12,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-22 01:33:12,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:12,881 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:12,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 01:33:12,881 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:12,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:12,881 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-22 01:33:12,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:12,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461398163] [2020-08-22 01:33:12,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:12,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:13,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:13,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:14,004 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:14,004 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461398163] [2020-08-22 01:33:14,005 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:14,005 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 01:33:14,006 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1964239397] [2020-08-22 01:33:14,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 01:33:14,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:14,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 01:33:14,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 01:33:14,009 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-22 01:33:15,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:15,868 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-22 01:33:15,869 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 01:33:15,869 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-22 01:33:15,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:15,870 INFO L225 Difference]: With dead ends: 154 [2020-08-22 01:33:15,870 INFO L226 Difference]: Without dead ends: 83 [2020-08-22 01:33:15,871 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 01:33:15,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-22 01:33:15,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-22 01:33:15,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-22 01:33:15,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-22 01:33:15,877 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-22 01:33:15,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:15,877 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-22 01:33:15,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 01:33:15,877 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-22 01:33:15,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-22 01:33:15,878 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:15,878 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:15,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 01:33:15,879 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:15,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:15,879 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-22 01:33:15,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:15,879 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101061984] [2020-08-22 01:33:15,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:15,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:17,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:17,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:17,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:17,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101061984] [2020-08-22 01:33:17,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:17,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 01:33:17,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1412071938] [2020-08-22 01:33:17,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 01:33:17,045 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:17,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 01:33:17,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 01:33:17,046 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-22 01:33:18,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:18,951 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-22 01:33:18,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 01:33:18,952 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-22 01:33:18,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:18,953 INFO L225 Difference]: With dead ends: 158 [2020-08-22 01:33:18,953 INFO L226 Difference]: Without dead ends: 85 [2020-08-22 01:33:18,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 01:33:18,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-22 01:33:18,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-22 01:33:18,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-22 01:33:18,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-22 01:33:18,960 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-22 01:33:18,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:18,961 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-22 01:33:18,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 01:33:18,961 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-22 01:33:18,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-22 01:33:18,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:18,962 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:18,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 01:33:18,962 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:18,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:18,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-22 01:33:18,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:18,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126224959] [2020-08-22 01:33:18,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:19,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:20,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:20,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:20,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:20,131 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126224959] [2020-08-22 01:33:20,132 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:20,132 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 01:33:20,132 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1206484948] [2020-08-22 01:33:20,132 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 01:33:20,132 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:20,133 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 01:33:20,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 01:33:20,133 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-22 01:33:22,052 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:22,052 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-22 01:33:22,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 01:33:22,059 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-22 01:33:22,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:22,060 INFO L225 Difference]: With dead ends: 162 [2020-08-22 01:33:22,060 INFO L226 Difference]: Without dead ends: 87 [2020-08-22 01:33:22,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 01:33:22,061 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-22 01:33:22,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-22 01:33:22,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-22 01:33:22,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-22 01:33:22,067 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-22 01:33:22,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:22,068 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-22 01:33:22,068 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 01:33:22,068 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-22 01:33:22,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-22 01:33:22,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:22,069 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:22,069 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 01:33:22,069 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:22,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:22,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-22 01:33:22,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:22,070 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [723002068] [2020-08-22 01:33:22,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:22,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:23,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:23,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:23,347 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:23,347 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [723002068] [2020-08-22 01:33:23,347 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:23,347 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 01:33:23,348 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1653691066] [2020-08-22 01:33:23,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 01:33:23,348 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:23,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 01:33:23,349 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 01:33:23,349 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-22 01:33:25,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:25,412 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-22 01:33:25,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 01:33:25,415 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-22 01:33:25,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:25,415 INFO L225 Difference]: With dead ends: 166 [2020-08-22 01:33:25,416 INFO L226 Difference]: Without dead ends: 89 [2020-08-22 01:33:25,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 01:33:25,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-22 01:33:25,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-22 01:33:25,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-22 01:33:25,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-22 01:33:25,422 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-22 01:33:25,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:25,422 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-22 01:33:25,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 01:33:25,423 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-22 01:33:25,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-22 01:33:25,423 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:25,423 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:25,424 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 01:33:25,424 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:25,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:25,424 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-22 01:33:25,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:25,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [808990529] [2020-08-22 01:33:25,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:25,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:26,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:26,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:26,703 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:26,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [808990529] [2020-08-22 01:33:26,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:26,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 01:33:26,704 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239181905] [2020-08-22 01:33:26,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 01:33:26,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:26,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 01:33:26,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 01:33:26,706 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-22 01:33:28,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:28,928 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-22 01:33:28,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 01:33:28,929 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-22 01:33:28,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:28,930 INFO L225 Difference]: With dead ends: 170 [2020-08-22 01:33:28,930 INFO L226 Difference]: Without dead ends: 91 [2020-08-22 01:33:28,931 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 01:33:28,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-22 01:33:28,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-22 01:33:28,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-22 01:33:28,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-22 01:33:28,938 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-22 01:33:28,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:28,938 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-22 01:33:28,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 01:33:28,938 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-22 01:33:28,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-22 01:33:28,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:28,939 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:28,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 01:33:28,940 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:28,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:28,940 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-22 01:33:28,940 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:28,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066681675] [2020-08-22 01:33:28,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:28,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:30,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:30,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:30,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:30,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066681675] [2020-08-22 01:33:30,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:30,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 01:33:30,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531142138] [2020-08-22 01:33:30,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 01:33:30,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:30,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 01:33:30,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 01:33:30,255 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-22 01:33:32,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:32,483 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-22 01:33:32,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 01:33:32,484 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-22 01:33:32,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:32,485 INFO L225 Difference]: With dead ends: 174 [2020-08-22 01:33:32,485 INFO L226 Difference]: Without dead ends: 93 [2020-08-22 01:33:32,486 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 01:33:32,486 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-22 01:33:32,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-22 01:33:32,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-22 01:33:32,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-22 01:33:32,493 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-22 01:33:32,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:32,493 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-22 01:33:32,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 01:33:32,493 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-22 01:33:32,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-22 01:33:32,494 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:32,494 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:32,494 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 01:33:32,494 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:32,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:32,495 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-22 01:33:32,495 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:32,495 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423945919] [2020-08-22 01:33:32,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:32,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:33,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:33,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:33,942 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:33,942 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423945919] [2020-08-22 01:33:33,942 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:33,942 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 01:33:33,942 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1158670877] [2020-08-22 01:33:33,943 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 01:33:33,943 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:33,943 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 01:33:33,944 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 01:33:33,944 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states.