/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=1000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/afnp2014.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 16:40:03,038 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 16:40:03,042 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 16:40:03,084 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 16:40:03,084 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 16:40:03,093 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 16:40:03,095 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 16:40:03,099 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 16:40:03,102 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 16:40:03,105 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 16:40:03,106 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 16:40:03,107 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 16:40:03,107 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 16:40:03,110 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 16:40:03,112 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 16:40:03,115 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 16:40:03,116 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 16:40:03,117 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 16:40:03,119 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 16:40:03,127 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 16:40:03,130 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 16:40:03,131 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 16:40:03,132 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 16:40:03,132 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 16:40:03,149 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 16:40:03,149 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 16:40:03,149 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 16:40:03,154 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 16:40:03,154 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 16:40:03,155 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-21 16:40:03,155 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 16:40:03,156 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 16:40:03,160 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 16:40:03,161 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 16:40:03,163 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 16:40:03,163 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 16:40:03,164 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 16:40:03,164 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 16:40:03,164 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 16:40:03,165 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 16:40:03,166 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 16:40:03,166 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 16:40:03,206 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 16:40:03,207 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 16:40:03,208 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 16:40:03,209 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 16:40:03,209 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 16:40:03,209 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 16:40:03,210 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 16:40:03,210 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 16:40:03,210 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 16:40:03,210 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 16:40:03,211 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 16:40:03,212 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 16:40:03,212 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 16:40:03,212 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 16:40:03,213 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 16:40:03,213 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 16:40:03,213 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 16:40:03,213 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 16:40:03,213 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 16:40:03,213 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 16:40:03,214 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 16:40:03,214 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:40:03,214 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 16:40:03,214 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 16:40:03,214 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 16:40:03,215 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 16:40:03,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 16:40:03,215 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 16:40:03,215 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 16:40:03,215 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=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=1000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 16:40:03,590 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 16:40:03,607 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 16:40:03,610 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 16:40:03,614 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 16:40:03,614 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 16:40:03,615 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 16:40:03,683 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5f9b9d1ba/ef4041d9f068441f9632aaa47eddc6ba/FLAGedbea40f7 [2020-08-21 16:40:04,094 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 16:40:04,095 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/afnp2014.i [2020-08-21 16:40:04,102 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5f9b9d1ba/ef4041d9f068441f9632aaa47eddc6ba/FLAGedbea40f7 [2020-08-21 16:40:04,540 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5f9b9d1ba/ef4041d9f068441f9632aaa47eddc6ba [2020-08-21 16:40:04,566 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 16:40:04,568 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 16:40:04,569 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 16:40:04,569 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 16:40:04,573 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 16:40:04,574 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,577 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ac45341 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04, skipping insertion in model container [2020-08-21 16:40:04,577 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,585 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 16:40:04,603 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 16:40:04,787 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:40:04,792 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 16:40:04,809 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 16:40:04,826 INFO L208 MainTranslator]: Completed translation [2020-08-21 16:40:04,827 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04 WrapperNode [2020-08-21 16:40:04,827 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 16:40:04,828 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 16:40:04,828 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 16:40:04,828 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 16:40:04,843 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,844 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,934 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,935 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,939 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,946 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,947 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... [2020-08-21 16:40:04,949 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 16:40:04,949 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 16:40:04,949 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 16:40:04,949 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 16:40:04,950 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 16:40:05,027 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 16:40:05,027 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 16:40:05,027 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 16:40:05,027 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 16:40:05,028 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 16:40:05,028 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 16:40:05,028 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 16:40:05,028 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 16:40:05,028 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 16:40:05,028 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 16:40:05,029 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 16:40:05,029 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 16:40:05,029 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 16:40:05,217 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 16:40:05,217 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 16:40:05,221 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:40:05 BoogieIcfgContainer [2020-08-21 16:40:05,221 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 16:40:05,223 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 16:40:05,223 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 16:40:05,226 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 16:40:05,227 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 04:40:04" (1/3) ... [2020-08-21 16:40:05,227 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578adc2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:40:05, skipping insertion in model container [2020-08-21 16:40:05,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 04:40:04" (2/3) ... [2020-08-21 16:40:05,228 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@578adc2c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 04:40:05, skipping insertion in model container [2020-08-21 16:40:05,228 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 04:40:05" (3/3) ... [2020-08-21 16:40:05,230 INFO L109 eAbstractionObserver]: Analyzing ICFG afnp2014.i [2020-08-21 16:40:05,242 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 16:40:05,249 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 16:40:05,273 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 16:40:05,299 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 16:40:05,300 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 16:40:05,300 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 16:40:05,300 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 16:40:05,300 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 16:40:05,300 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 16:40:05,301 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 16:40:05,301 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 16:40:05,320 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 16:40:05,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 16:40:05,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:05,328 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:05,329 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:05,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:05,336 INFO L82 PathProgramCache]: Analyzing trace with hash -1915647303, now seen corresponding path program 1 times [2020-08-21 16:40:05,345 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:05,346 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [538188893] [2020-08-21 16:40:05,346 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:05,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:05,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:05,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:05,475 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:05,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [538188893] [2020-08-21 16:40:05,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:40:05,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 16:40:05,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1187813417] [2020-08-21 16:40:05,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 16:40:05,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:05,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 16:40:05,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 16:40:05,503 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2020-08-21 16:40:05,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:05,526 INFO L93 Difference]: Finished difference Result 32 states and 36 transitions. [2020-08-21 16:40:05,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 16:40:05,528 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 16:40:05,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:05,537 INFO L225 Difference]: With dead ends: 32 [2020-08-21 16:40:05,537 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 16:40:05,541 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 16:40:05,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 16:40:05,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 16:40:05,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 16:40:05,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-08-21 16:40:05,582 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-08-21 16:40:05,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:05,582 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-08-21 16:40:05,582 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 16:40:05,583 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-08-21 16:40:05,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 16:40:05,583 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:05,584 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:05,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 16:40:05,584 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:05,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:05,585 INFO L82 PathProgramCache]: Analyzing trace with hash 2084433522, now seen corresponding path program 1 times [2020-08-21 16:40:05,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:05,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123482158] [2020-08-21 16:40:05,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:05,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:05,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:05,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:05,714 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:05,715 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123482158] [2020-08-21 16:40:05,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 16:40:05,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 16:40:05,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225197668] [2020-08-21 16:40:05,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 16:40:05,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:05,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 16:40:05,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 16:40:05,720 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 5 states. [2020-08-21 16:40:05,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:05,805 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-08-21 16:40:05,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 16:40:05,806 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 16:40:05,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:05,807 INFO L225 Difference]: With dead ends: 21 [2020-08-21 16:40:05,807 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 16:40:05,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:40:05,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 16:40:05,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 16:40:05,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 16:40:05,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 16:40:05,814 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2020-08-21 16:40:05,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:05,815 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 16:40:05,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 16:40:05,815 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 16:40:05,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 16:40:05,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:05,816 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:05,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 16:40:05,817 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:05,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:05,817 INFO L82 PathProgramCache]: Analyzing trace with hash 249504553, now seen corresponding path program 1 times [2020-08-21 16:40:05,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:05,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393355586] [2020-08-21 16:40:05,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:05,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:05,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:05,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:05,908 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:05,908 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393355586] [2020-08-21 16:40:05,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:05,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 16:40:05,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719867090] [2020-08-21 16:40:05,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 16:40:05,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:05,910 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 16:40:05,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 16:40:05,913 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 6 states. [2020-08-21 16:40:06,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:06,003 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 16:40:06,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 16:40:06,004 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-08-21 16:40:06,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:06,005 INFO L225 Difference]: With dead ends: 24 [2020-08-21 16:40:06,005 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 16:40:06,006 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:40:06,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 16:40:06,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 16:40:06,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 16:40:06,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 22 transitions. [2020-08-21 16:40:06,012 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 22 transitions. Word has length 15 [2020-08-21 16:40:06,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:06,013 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 22 transitions. [2020-08-21 16:40:06,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 16:40:06,013 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 22 transitions. [2020-08-21 16:40:06,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 16:40:06,014 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:06,014 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:06,014 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 16:40:06,015 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:06,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:06,015 INFO L82 PathProgramCache]: Analyzing trace with hash -2070634734, now seen corresponding path program 2 times [2020-08-21 16:40:06,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:06,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [606435090] [2020-08-21 16:40:06,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:06,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:06,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,123 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:06,124 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [606435090] [2020-08-21 16:40:06,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:06,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 16:40:06,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2030928954] [2020-08-21 16:40:06,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 16:40:06,125 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:06,125 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 16:40:06,126 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 16:40:06,126 INFO L87 Difference]: Start difference. First operand 19 states and 22 transitions. Second operand 7 states. [2020-08-21 16:40:06,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:06,206 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2020-08-21 16:40:06,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 16:40:06,206 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 16:40:06,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:06,208 INFO L225 Difference]: With dead ends: 27 [2020-08-21 16:40:06,208 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 16:40:06,209 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:40:06,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 16:40:06,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 16:40:06,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 16:40:06,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2020-08-21 16:40:06,215 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 18 [2020-08-21 16:40:06,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:06,216 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2020-08-21 16:40:06,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 16:40:06,216 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2020-08-21 16:40:06,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 16:40:06,217 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:06,217 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:06,217 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 16:40:06,218 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:06,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:06,218 INFO L82 PathProgramCache]: Analyzing trace with hash 1863528073, now seen corresponding path program 3 times [2020-08-21 16:40:06,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:06,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026912851] [2020-08-21 16:40:06,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:06,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:06,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,339 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:06,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026912851] [2020-08-21 16:40:06,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:06,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 16:40:06,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759039362] [2020-08-21 16:40:06,341 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 16:40:06,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:06,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 16:40:06,342 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-08-21 16:40:06,343 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand 8 states. [2020-08-21 16:40:06,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:06,427 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 16:40:06,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 16:40:06,428 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-08-21 16:40:06,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:06,429 INFO L225 Difference]: With dead ends: 30 [2020-08-21 16:40:06,429 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 16:40:06,430 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:40:06,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 16:40:06,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 16:40:06,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 16:40:06,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-08-21 16:40:06,437 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 21 [2020-08-21 16:40:06,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:06,438 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-08-21 16:40:06,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 16:40:06,438 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-08-21 16:40:06,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 16:40:06,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:06,439 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:06,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 16:40:06,440 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:06,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:06,441 INFO L82 PathProgramCache]: Analyzing trace with hash -854829134, now seen corresponding path program 4 times [2020-08-21 16:40:06,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:06,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1851997932] [2020-08-21 16:40:06,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:06,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:06,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,613 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:06,614 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1851997932] [2020-08-21 16:40:06,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:06,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 16:40:06,615 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287941576] [2020-08-21 16:40:06,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 16:40:06,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:06,616 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 16:40:06,616 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 16:40:06,616 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 9 states. [2020-08-21 16:40:06,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:06,760 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2020-08-21 16:40:06,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 16:40:06,760 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2020-08-21 16:40:06,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:06,761 INFO L225 Difference]: With dead ends: 33 [2020-08-21 16:40:06,762 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 16:40:06,762 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:40:06,763 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 16:40:06,768 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 16:40:06,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 16:40:06,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2020-08-21 16:40:06,769 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 24 [2020-08-21 16:40:06,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:06,770 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2020-08-21 16:40:06,770 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 16:40:06,770 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2020-08-21 16:40:06,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 16:40:06,771 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:06,771 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:06,771 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 16:40:06,772 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:06,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:06,772 INFO L82 PathProgramCache]: Analyzing trace with hash -1826016791, now seen corresponding path program 5 times [2020-08-21 16:40:06,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:06,773 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [995463928] [2020-08-21 16:40:06,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:06,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:06,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:06,921 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:06,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [995463928] [2020-08-21 16:40:06,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:06,923 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 16:40:06,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657053382] [2020-08-21 16:40:06,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 16:40:06,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:06,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 16:40:06,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-08-21 16:40:06,924 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand 10 states. [2020-08-21 16:40:07,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:07,025 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2020-08-21 16:40:07,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 16:40:07,026 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 16:40:07,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:07,027 INFO L225 Difference]: With dead ends: 36 [2020-08-21 16:40:07,027 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 16:40:07,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:40:07,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 16:40:07,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 16:40:07,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 16:40:07,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2020-08-21 16:40:07,034 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 27 [2020-08-21 16:40:07,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:07,035 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2020-08-21 16:40:07,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 16:40:07,035 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2020-08-21 16:40:07,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 16:40:07,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:07,036 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:07,037 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 16:40:07,037 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:07,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:07,037 INFO L82 PathProgramCache]: Analyzing trace with hash 717166674, now seen corresponding path program 6 times [2020-08-21 16:40:07,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:07,038 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [295733782] [2020-08-21 16:40:07,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:07,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:07,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:07,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:07,214 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:07,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [295733782] [2020-08-21 16:40:07,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:07,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 16:40:07,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323609119] [2020-08-21 16:40:07,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 16:40:07,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:07,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 16:40:07,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 16:40:07,216 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 11 states. [2020-08-21 16:40:07,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:07,348 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-08-21 16:40:07,348 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 16:40:07,349 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 16:40:07,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:07,350 INFO L225 Difference]: With dead ends: 39 [2020-08-21 16:40:07,350 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 16:40:07,351 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:40:07,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 16:40:07,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 16:40:07,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 16:40:07,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 16:40:07,368 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 30 [2020-08-21 16:40:07,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:07,369 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 16:40:07,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 16:40:07,369 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 16:40:07,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 16:40:07,371 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:07,371 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:07,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 16:40:07,372 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:07,372 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:07,372 INFO L82 PathProgramCache]: Analyzing trace with hash 1472671049, now seen corresponding path program 7 times [2020-08-21 16:40:07,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:07,373 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429658106] [2020-08-21 16:40:07,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:07,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:07,580 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:07,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:07,586 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 84 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:07,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429658106] [2020-08-21 16:40:07,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:07,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 16:40:07,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102954762] [2020-08-21 16:40:07,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 16:40:07,593 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:07,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 16:40:07,597 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-21 16:40:07,597 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 12 states. [2020-08-21 16:40:07,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:07,756 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2020-08-21 16:40:07,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 16:40:07,757 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 33 [2020-08-21 16:40:07,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:07,770 INFO L225 Difference]: With dead ends: 42 [2020-08-21 16:40:07,770 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 16:40:07,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:40:07,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 16:40:07,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 16:40:07,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 16:40:07,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 46 transitions. [2020-08-21 16:40:07,778 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 46 transitions. Word has length 33 [2020-08-21 16:40:07,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:07,778 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 46 transitions. [2020-08-21 16:40:07,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 16:40:07,779 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 46 transitions. [2020-08-21 16:40:07,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 16:40:07,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:07,780 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:07,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 16:40:07,780 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:07,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:07,781 INFO L82 PathProgramCache]: Analyzing trace with hash -1220091662, now seen corresponding path program 8 times [2020-08-21 16:40:07,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:07,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1079582084] [2020-08-21 16:40:07,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:07,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:07,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:07,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:07,929 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 108 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:07,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1079582084] [2020-08-21 16:40:07,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:07,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 16:40:07,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1735991338] [2020-08-21 16:40:07,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 16:40:07,930 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:07,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 16:40:07,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 16:40:07,931 INFO L87 Difference]: Start difference. First operand 37 states and 46 transitions. Second operand 13 states. [2020-08-21 16:40:08,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:08,132 INFO L93 Difference]: Finished difference Result 45 states and 55 transitions. [2020-08-21 16:40:08,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 16:40:08,133 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-21 16:40:08,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:08,134 INFO L225 Difference]: With dead ends: 45 [2020-08-21 16:40:08,134 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 16:40:08,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=155, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:40:08,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 16:40:08,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 16:40:08,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 16:40:08,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 50 transitions. [2020-08-21 16:40:08,142 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 50 transitions. Word has length 36 [2020-08-21 16:40:08,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:08,142 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 50 transitions. [2020-08-21 16:40:08,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 16:40:08,142 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 50 transitions. [2020-08-21 16:40:08,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 16:40:08,143 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:08,144 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:08,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 16:40:08,144 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:08,144 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:08,145 INFO L82 PathProgramCache]: Analyzing trace with hash 85139625, now seen corresponding path program 9 times [2020-08-21 16:40:08,145 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:08,145 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121221015] [2020-08-21 16:40:08,145 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:08,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:08,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:08,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:08,345 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:08,346 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121221015] [2020-08-21 16:40:08,346 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:08,346 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 16:40:08,346 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [282197472] [2020-08-21 16:40:08,347 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 16:40:08,349 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:08,349 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 16:40:08,350 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=157, Unknown=0, NotChecked=0, Total=182 [2020-08-21 16:40:08,350 INFO L87 Difference]: Start difference. First operand 40 states and 50 transitions. Second operand 14 states. [2020-08-21 16:40:08,560 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:08,560 INFO L93 Difference]: Finished difference Result 48 states and 59 transitions. [2020-08-21 16:40:08,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 16:40:08,560 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-08-21 16:40:08,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:08,561 INFO L225 Difference]: With dead ends: 48 [2020-08-21 16:40:08,561 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 16:40:08,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2020-08-21 16:40:08,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 16:40:08,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 16:40:08,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 16:40:08,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 54 transitions. [2020-08-21 16:40:08,572 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 54 transitions. Word has length 39 [2020-08-21 16:40:08,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:08,573 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 54 transitions. [2020-08-21 16:40:08,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 16:40:08,573 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 54 transitions. [2020-08-21 16:40:08,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 16:40:08,576 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:08,577 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:08,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 16:40:08,577 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:08,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:08,577 INFO L82 PathProgramCache]: Analyzing trace with hash 1891479954, now seen corresponding path program 10 times [2020-08-21 16:40:08,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:08,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1215800171] [2020-08-21 16:40:08,579 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:08,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:08,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:08,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:08,801 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:08,813 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1215800171] [2020-08-21 16:40:08,813 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:08,813 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 16:40:08,813 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [351157467] [2020-08-21 16:40:08,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 16:40:08,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:08,815 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 16:40:08,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 16:40:08,816 INFO L87 Difference]: Start difference. First operand 43 states and 54 transitions. Second operand 15 states. [2020-08-21 16:40:09,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:09,069 INFO L93 Difference]: Finished difference Result 51 states and 63 transitions. [2020-08-21 16:40:09,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 16:40:09,069 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 42 [2020-08-21 16:40:09,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:09,071 INFO L225 Difference]: With dead ends: 51 [2020-08-21 16:40:09,071 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 16:40:09,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:40:09,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 16:40:09,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 16:40:09,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 16:40:09,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 58 transitions. [2020-08-21 16:40:09,079 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 58 transitions. Word has length 42 [2020-08-21 16:40:09,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:09,079 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 58 transitions. [2020-08-21 16:40:09,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 16:40:09,079 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 58 transitions. [2020-08-21 16:40:09,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 16:40:09,087 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:09,087 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:09,088 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 16:40:09,088 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:09,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:09,088 INFO L82 PathProgramCache]: Analyzing trace with hash -1363997687, now seen corresponding path program 11 times [2020-08-21 16:40:09,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:09,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300049971] [2020-08-21 16:40:09,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:09,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:09,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:09,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:09,277 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:09,277 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300049971] [2020-08-21 16:40:09,278 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:09,278 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 16:40:09,278 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15443] [2020-08-21 16:40:09,278 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 16:40:09,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:09,279 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 16:40:09,279 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=211, Unknown=0, NotChecked=0, Total=240 [2020-08-21 16:40:09,279 INFO L87 Difference]: Start difference. First operand 46 states and 58 transitions. Second operand 16 states. [2020-08-21 16:40:09,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:09,577 INFO L93 Difference]: Finished difference Result 54 states and 67 transitions. [2020-08-21 16:40:09,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 16:40:09,578 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 45 [2020-08-21 16:40:09,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:09,579 INFO L225 Difference]: With dead ends: 54 [2020-08-21 16:40:09,579 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 16:40:09,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-08-21 16:40:09,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 16:40:09,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 16:40:09,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 16:40:09,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 62 transitions. [2020-08-21 16:40:09,590 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 62 transitions. Word has length 45 [2020-08-21 16:40:09,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:09,591 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 62 transitions. [2020-08-21 16:40:09,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 16:40:09,591 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 62 transitions. [2020-08-21 16:40:09,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 16:40:09,592 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:09,592 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:09,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 16:40:09,592 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:09,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:09,593 INFO L82 PathProgramCache]: Analyzing trace with hash -641889742, now seen corresponding path program 12 times [2020-08-21 16:40:09,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:09,593 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039766982] [2020-08-21 16:40:09,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:09,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:09,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:09,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:09,820 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 234 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:09,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039766982] [2020-08-21 16:40:09,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:09,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 16:40:09,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1740645415] [2020-08-21 16:40:09,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 16:40:09,822 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:09,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 16:40:09,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 16:40:09,823 INFO L87 Difference]: Start difference. First operand 49 states and 62 transitions. Second operand 17 states. [2020-08-21 16:40:10,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:10,122 INFO L93 Difference]: Finished difference Result 57 states and 71 transitions. [2020-08-21 16:40:10,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 16:40:10,122 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 16:40:10,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:10,123 INFO L225 Difference]: With dead ends: 57 [2020-08-21 16:40:10,123 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 16:40:10,124 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:40:10,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 16:40:10,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 16:40:10,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 16:40:10,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 66 transitions. [2020-08-21 16:40:10,131 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 66 transitions. Word has length 48 [2020-08-21 16:40:10,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:10,132 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 66 transitions. [2020-08-21 16:40:10,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 16:40:10,132 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 66 transitions. [2020-08-21 16:40:10,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 16:40:10,133 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:10,133 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:10,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 16:40:10,133 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:10,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:10,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1815285911, now seen corresponding path program 13 times [2020-08-21 16:40:10,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:10,134 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574134656] [2020-08-21 16:40:10,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:10,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:10,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:10,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:10,366 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 273 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:10,366 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574134656] [2020-08-21 16:40:10,366 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:10,367 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 16:40:10,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658972440] [2020-08-21 16:40:10,367 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 16:40:10,367 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:10,368 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 16:40:10,368 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=273, Unknown=0, NotChecked=0, Total=306 [2020-08-21 16:40:10,368 INFO L87 Difference]: Start difference. First operand 52 states and 66 transitions. Second operand 18 states. [2020-08-21 16:40:10,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:10,658 INFO L93 Difference]: Finished difference Result 60 states and 75 transitions. [2020-08-21 16:40:10,659 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 16:40:10,659 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 51 [2020-08-21 16:40:10,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:10,660 INFO L225 Difference]: With dead ends: 60 [2020-08-21 16:40:10,660 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 16:40:10,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=305, Unknown=0, NotChecked=0, Total=342 [2020-08-21 16:40:10,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 16:40:10,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 16:40:10,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 16:40:10,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 70 transitions. [2020-08-21 16:40:10,677 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 70 transitions. Word has length 51 [2020-08-21 16:40:10,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:10,677 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 70 transitions. [2020-08-21 16:40:10,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 16:40:10,678 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 70 transitions. [2020-08-21 16:40:10,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 16:40:10,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:10,680 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:10,680 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 16:40:10,680 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:10,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:10,681 INFO L82 PathProgramCache]: Analyzing trace with hash -1721734446, now seen corresponding path program 14 times [2020-08-21 16:40:10,681 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:10,681 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [439686368] [2020-08-21 16:40:10,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:10,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:11,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:11,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:11,024 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 315 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:11,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [439686368] [2020-08-21 16:40:11,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:11,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 16:40:11,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842066892] [2020-08-21 16:40:11,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 16:40:11,026 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:11,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 16:40:11,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 16:40:11,027 INFO L87 Difference]: Start difference. First operand 55 states and 70 transitions. Second operand 19 states. [2020-08-21 16:40:11,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:11,403 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 16:40:11,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 16:40:11,409 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 54 [2020-08-21 16:40:11,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:11,410 INFO L225 Difference]: With dead ends: 63 [2020-08-21 16:40:11,410 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 16:40:11,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=341, Unknown=0, NotChecked=0, Total=380 [2020-08-21 16:40:11,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 16:40:11,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 16:40:11,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 16:40:11,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 74 transitions. [2020-08-21 16:40:11,418 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 74 transitions. Word has length 54 [2020-08-21 16:40:11,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:11,418 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 74 transitions. [2020-08-21 16:40:11,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 16:40:11,419 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 74 transitions. [2020-08-21 16:40:11,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 16:40:11,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:11,420 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:11,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 16:40:11,420 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:11,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:11,420 INFO L82 PathProgramCache]: Analyzing trace with hash 2131151561, now seen corresponding path program 15 times [2020-08-21 16:40:11,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:11,421 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1670593899] [2020-08-21 16:40:11,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:11,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:11,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:11,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:11,685 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:11,685 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1670593899] [2020-08-21 16:40:11,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:11,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 16:40:11,686 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635702958] [2020-08-21 16:40:11,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 16:40:11,687 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:11,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 16:40:11,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=343, Unknown=0, NotChecked=0, Total=380 [2020-08-21 16:40:11,687 INFO L87 Difference]: Start difference. First operand 58 states and 74 transitions. Second operand 20 states. [2020-08-21 16:40:12,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:12,178 INFO L93 Difference]: Finished difference Result 66 states and 83 transitions. [2020-08-21 16:40:12,179 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 16:40:12,179 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 57 [2020-08-21 16:40:12,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:12,180 INFO L225 Difference]: With dead ends: 66 [2020-08-21 16:40:12,180 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 16:40:12,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2020-08-21 16:40:12,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 16:40:12,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2020-08-21 16:40:12,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 16:40:12,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 78 transitions. [2020-08-21 16:40:12,201 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 78 transitions. Word has length 57 [2020-08-21 16:40:12,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:12,202 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 78 transitions. [2020-08-21 16:40:12,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 16:40:12,202 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 78 transitions. [2020-08-21 16:40:12,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 16:40:12,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:12,203 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:12,203 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 16:40:12,204 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:12,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:12,204 INFO L82 PathProgramCache]: Analyzing trace with hash 457200498, now seen corresponding path program 16 times [2020-08-21 16:40:12,204 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:12,204 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1677848151] [2020-08-21 16:40:12,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:12,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:12,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:12,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:12,532 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 408 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:12,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1677848151] [2020-08-21 16:40:12,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:12,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 16:40:12,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66222115] [2020-08-21 16:40:12,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 16:40:12,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:12,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 16:40:12,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 16:40:12,534 INFO L87 Difference]: Start difference. First operand 61 states and 78 transitions. Second operand 21 states. [2020-08-21 16:40:12,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:12,951 INFO L93 Difference]: Finished difference Result 69 states and 87 transitions. [2020-08-21 16:40:12,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 16:40:12,952 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 60 [2020-08-21 16:40:12,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:12,953 INFO L225 Difference]: With dead ends: 69 [2020-08-21 16:40:12,953 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 16:40:12,954 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2020-08-21 16:40:12,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 16:40:12,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2020-08-21 16:40:12,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 16:40:12,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 82 transitions. [2020-08-21 16:40:12,961 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 82 transitions. Word has length 60 [2020-08-21 16:40:12,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:12,962 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 82 transitions. [2020-08-21 16:40:12,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 16:40:12,962 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 82 transitions. [2020-08-21 16:40:12,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 16:40:12,963 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:12,963 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:12,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 16:40:12,963 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:12,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:12,964 INFO L82 PathProgramCache]: Analyzing trace with hash 646356521, now seen corresponding path program 17 times [2020-08-21 16:40:12,964 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:12,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344885516] [2020-08-21 16:40:12,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:12,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:13,296 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:13,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:13,309 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 459 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:13,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344885516] [2020-08-21 16:40:13,309 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:13,310 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 16:40:13,310 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [618002987] [2020-08-21 16:40:13,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 16:40:13,310 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:13,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 16:40:13,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=421, Unknown=0, NotChecked=0, Total=462 [2020-08-21 16:40:13,311 INFO L87 Difference]: Start difference. First operand 64 states and 82 transitions. Second operand 22 states. [2020-08-21 16:40:13,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:13,817 INFO L93 Difference]: Finished difference Result 72 states and 91 transitions. [2020-08-21 16:40:13,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 16:40:13,817 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 63 [2020-08-21 16:40:13,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:13,819 INFO L225 Difference]: With dead ends: 72 [2020-08-21 16:40:13,819 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 16:40:13,820 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2020-08-21 16:40:13,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 16:40:13,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-08-21 16:40:13,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 16:40:13,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 86 transitions. [2020-08-21 16:40:13,827 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 86 transitions. Word has length 63 [2020-08-21 16:40:13,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:13,827 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 86 transitions. [2020-08-21 16:40:13,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 16:40:13,828 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 86 transitions. [2020-08-21 16:40:13,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 16:40:13,828 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:13,828 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:13,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 16:40:13,829 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:13,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:13,829 INFO L82 PathProgramCache]: Analyzing trace with hash 796345362, now seen corresponding path program 18 times [2020-08-21 16:40:13,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:13,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [119659231] [2020-08-21 16:40:13,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:13,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:14,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:14,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:14,188 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 513 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:14,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [119659231] [2020-08-21 16:40:14,189 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:14,189 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 16:40:14,190 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184712224] [2020-08-21 16:40:14,190 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 16:40:14,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:14,191 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 16:40:14,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 16:40:14,191 INFO L87 Difference]: Start difference. First operand 67 states and 86 transitions. Second operand 23 states. [2020-08-21 16:40:14,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:14,687 INFO L93 Difference]: Finished difference Result 75 states and 95 transitions. [2020-08-21 16:40:14,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 16:40:14,688 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 66 [2020-08-21 16:40:14,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:14,689 INFO L225 Difference]: With dead ends: 75 [2020-08-21 16:40:14,689 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 16:40:14,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2020-08-21 16:40:14,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 16:40:14,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2020-08-21 16:40:14,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 16:40:14,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 90 transitions. [2020-08-21 16:40:14,697 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 90 transitions. Word has length 66 [2020-08-21 16:40:14,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:14,698 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 90 transitions. [2020-08-21 16:40:14,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 16:40:14,698 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 90 transitions. [2020-08-21 16:40:14,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 16:40:14,699 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:14,699 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:14,699 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 16:40:14,699 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:14,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:14,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1947047543, now seen corresponding path program 19 times [2020-08-21 16:40:14,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:14,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [797864705] [2020-08-21 16:40:14,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:14,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:15,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:15,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:15,092 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 570 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:15,092 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [797864705] [2020-08-21 16:40:15,092 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:15,092 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 16:40:15,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [614612241] [2020-08-21 16:40:15,093 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 16:40:15,093 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:15,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 16:40:15,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=507, Unknown=0, NotChecked=0, Total=552 [2020-08-21 16:40:15,094 INFO L87 Difference]: Start difference. First operand 70 states and 90 transitions. Second operand 24 states. [2020-08-21 16:40:15,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:15,660 INFO L93 Difference]: Finished difference Result 78 states and 99 transitions. [2020-08-21 16:40:15,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 16:40:15,660 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 69 [2020-08-21 16:40:15,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:15,662 INFO L225 Difference]: With dead ends: 78 [2020-08-21 16:40:15,662 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 16:40:15,663 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=551, Unknown=0, NotChecked=0, Total=600 [2020-08-21 16:40:15,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 16:40:15,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2020-08-21 16:40:15,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 16:40:15,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 94 transitions. [2020-08-21 16:40:15,670 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 94 transitions. Word has length 69 [2020-08-21 16:40:15,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:15,670 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 94 transitions. [2020-08-21 16:40:15,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 16:40:15,670 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 94 transitions. [2020-08-21 16:40:15,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 16:40:15,671 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:15,671 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:15,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 16:40:15,672 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:15,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:15,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1432404814, now seen corresponding path program 20 times [2020-08-21 16:40:15,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:15,672 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [634946679] [2020-08-21 16:40:15,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:15,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:16,090 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:16,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:16,100 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:16,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [634946679] [2020-08-21 16:40:16,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:16,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 16:40:16,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313030005] [2020-08-21 16:40:16,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 16:40:16,102 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:16,102 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 16:40:16,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 16:40:16,103 INFO L87 Difference]: Start difference. First operand 73 states and 94 transitions. Second operand 25 states. [2020-08-21 16:40:16,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:16,771 INFO L93 Difference]: Finished difference Result 81 states and 103 transitions. [2020-08-21 16:40:16,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 16:40:16,775 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 72 [2020-08-21 16:40:16,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:16,776 INFO L225 Difference]: With dead ends: 81 [2020-08-21 16:40:16,776 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 16:40:16,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=599, Unknown=0, NotChecked=0, Total=650 [2020-08-21 16:40:16,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 16:40:16,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-08-21 16:40:16,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 16:40:16,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 98 transitions. [2020-08-21 16:40:16,783 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 98 transitions. Word has length 72 [2020-08-21 16:40:16,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:16,783 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 98 transitions. [2020-08-21 16:40:16,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 16:40:16,784 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 98 transitions. [2020-08-21 16:40:16,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 16:40:16,784 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:16,785 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:16,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 16:40:16,785 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:16,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:16,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1550855401, now seen corresponding path program 21 times [2020-08-21 16:40:16,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:16,786 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260770254] [2020-08-21 16:40:16,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:16,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:17,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:17,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:17,266 INFO L134 CoverageAnalysis]: Checked inductivity of 693 backedges. 0 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:17,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260770254] [2020-08-21 16:40:17,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:17,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 16:40:17,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908893061] [2020-08-21 16:40:17,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 16:40:17,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:17,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 16:40:17,268 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-08-21 16:40:17,269 INFO L87 Difference]: Start difference. First operand 76 states and 98 transitions. Second operand 26 states. [2020-08-21 16:40:17,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:17,995 INFO L93 Difference]: Finished difference Result 84 states and 107 transitions. [2020-08-21 16:40:17,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 16:40:17,995 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 75 [2020-08-21 16:40:17,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:17,997 INFO L225 Difference]: With dead ends: 84 [2020-08-21 16:40:17,997 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 16:40:17,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2020-08-21 16:40:17,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 16:40:18,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2020-08-21 16:40:18,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 16:40:18,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 102 transitions. [2020-08-21 16:40:18,005 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 102 transitions. Word has length 75 [2020-08-21 16:40:18,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:18,005 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 102 transitions. [2020-08-21 16:40:18,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 16:40:18,006 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 102 transitions. [2020-08-21 16:40:18,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 16:40:18,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:18,007 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:18,007 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 16:40:18,007 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:18,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:18,007 INFO L82 PathProgramCache]: Analyzing trace with hash 97664338, now seen corresponding path program 22 times [2020-08-21 16:40:18,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:18,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2057590440] [2020-08-21 16:40:18,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:18,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:18,470 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:18,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:18,481 INFO L134 CoverageAnalysis]: Checked inductivity of 759 backedges. 0 proven. 759 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:18,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2057590440] [2020-08-21 16:40:18,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:18,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 16:40:18,482 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42911959] [2020-08-21 16:40:18,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 16:40:18,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:18,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 16:40:18,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 16:40:18,483 INFO L87 Difference]: Start difference. First operand 79 states and 102 transitions. Second operand 27 states. [2020-08-21 16:40:19,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:19,280 INFO L93 Difference]: Finished difference Result 87 states and 111 transitions. [2020-08-21 16:40:19,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 16:40:19,281 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 78 [2020-08-21 16:40:19,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:19,282 INFO L225 Difference]: With dead ends: 87 [2020-08-21 16:40:19,282 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 16:40:19,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2020-08-21 16:40:19,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 16:40:19,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2020-08-21 16:40:19,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 16:40:19,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 106 transitions. [2020-08-21 16:40:19,288 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 106 transitions. Word has length 78 [2020-08-21 16:40:19,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:19,289 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 106 transitions. [2020-08-21 16:40:19,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 16:40:19,289 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 106 transitions. [2020-08-21 16:40:19,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 16:40:19,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:19,290 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:19,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 16:40:19,290 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:19,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:19,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1353050185, now seen corresponding path program 23 times [2020-08-21 16:40:19,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:19,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196195812] [2020-08-21 16:40:19,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:19,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:19,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:19,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:19,856 INFO L134 CoverageAnalysis]: Checked inductivity of 828 backedges. 0 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:19,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196195812] [2020-08-21 16:40:19,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:19,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 16:40:19,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1590027996] [2020-08-21 16:40:19,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 16:40:19,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:19,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 16:40:19,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=703, Unknown=0, NotChecked=0, Total=756 [2020-08-21 16:40:19,858 INFO L87 Difference]: Start difference. First operand 82 states and 106 transitions. Second operand 28 states. [2020-08-21 16:40:20,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:20,645 INFO L93 Difference]: Finished difference Result 90 states and 115 transitions. [2020-08-21 16:40:20,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 16:40:20,645 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 81 [2020-08-21 16:40:20,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:20,646 INFO L225 Difference]: With dead ends: 90 [2020-08-21 16:40:20,646 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 16:40:20,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2020-08-21 16:40:20,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 16:40:20,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2020-08-21 16:40:20,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 16:40:20,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 110 transitions. [2020-08-21 16:40:20,653 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 110 transitions. Word has length 81 [2020-08-21 16:40:20,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:20,654 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 110 transitions. [2020-08-21 16:40:20,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 16:40:20,654 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 110 transitions. [2020-08-21 16:40:20,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 16:40:20,655 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:20,655 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:20,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 16:40:20,655 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:20,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:20,655 INFO L82 PathProgramCache]: Analyzing trace with hash -22395406, now seen corresponding path program 24 times [2020-08-21 16:40:20,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:20,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571442855] [2020-08-21 16:40:20,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:20,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:21,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:21,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:21,253 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:21,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571442855] [2020-08-21 16:40:21,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:21,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 16:40:21,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1721302897] [2020-08-21 16:40:21,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 16:40:21,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:21,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 16:40:21,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 16:40:21,258 INFO L87 Difference]: Start difference. First operand 85 states and 110 transitions. Second operand 29 states. [2020-08-21 16:40:22,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:22,417 INFO L93 Difference]: Finished difference Result 93 states and 119 transitions. [2020-08-21 16:40:22,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 16:40:22,417 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 84 [2020-08-21 16:40:22,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:22,418 INFO L225 Difference]: With dead ends: 93 [2020-08-21 16:40:22,418 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 16:40:22,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2020-08-21 16:40:22,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 16:40:22,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 88. [2020-08-21 16:40:22,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 16:40:22,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 114 transitions. [2020-08-21 16:40:22,425 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 114 transitions. Word has length 84 [2020-08-21 16:40:22,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:22,426 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 114 transitions. [2020-08-21 16:40:22,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 16:40:22,426 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 114 transitions. [2020-08-21 16:40:22,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 16:40:22,427 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:22,427 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:22,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 16:40:22,427 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:22,428 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:22,428 INFO L82 PathProgramCache]: Analyzing trace with hash -1933993047, now seen corresponding path program 25 times [2020-08-21 16:40:22,429 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:22,429 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475061710] [2020-08-21 16:40:22,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:22,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:23,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:23,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:23,038 INFO L134 CoverageAnalysis]: Checked inductivity of 975 backedges. 0 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:23,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475061710] [2020-08-21 16:40:23,039 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:23,039 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 16:40:23,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [71862428] [2020-08-21 16:40:23,039 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 16:40:23,039 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:23,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 16:40:23,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=813, Unknown=0, NotChecked=0, Total=870 [2020-08-21 16:40:23,040 INFO L87 Difference]: Start difference. First operand 88 states and 114 transitions. Second operand 30 states. [2020-08-21 16:40:24,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:24,042 INFO L93 Difference]: Finished difference Result 96 states and 123 transitions. [2020-08-21 16:40:24,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 16:40:24,043 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 87 [2020-08-21 16:40:24,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:24,045 INFO L225 Difference]: With dead ends: 96 [2020-08-21 16:40:24,045 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 16:40:24,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=869, Unknown=0, NotChecked=0, Total=930 [2020-08-21 16:40:24,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 16:40:24,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2020-08-21 16:40:24,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 16:40:24,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 118 transitions. [2020-08-21 16:40:24,054 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 118 transitions. Word has length 87 [2020-08-21 16:40:24,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:24,054 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 118 transitions. [2020-08-21 16:40:24,054 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 16:40:24,054 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 118 transitions. [2020-08-21 16:40:24,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 16:40:24,055 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:24,055 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:24,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 16:40:24,056 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:24,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:24,056 INFO L82 PathProgramCache]: Analyzing trace with hash 927028882, now seen corresponding path program 26 times [2020-08-21 16:40:24,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:24,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [405577871] [2020-08-21 16:40:24,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:24,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:24,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:24,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:24,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1053 backedges. 0 proven. 1053 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:24,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [405577871] [2020-08-21 16:40:24,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:24,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 16:40:24,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061777150] [2020-08-21 16:40:24,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 16:40:24,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:24,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 16:40:24,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-21 16:40:24,776 INFO L87 Difference]: Start difference. First operand 91 states and 118 transitions. Second operand 31 states. [2020-08-21 16:40:25,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:25,788 INFO L93 Difference]: Finished difference Result 99 states and 127 transitions. [2020-08-21 16:40:25,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 16:40:25,789 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 90 [2020-08-21 16:40:25,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:25,790 INFO L225 Difference]: With dead ends: 99 [2020-08-21 16:40:25,790 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 16:40:25,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=63, Invalid=929, Unknown=0, NotChecked=0, Total=992 [2020-08-21 16:40:25,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 16:40:25,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2020-08-21 16:40:25,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2020-08-21 16:40:25,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 122 transitions. [2020-08-21 16:40:25,798 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 122 transitions. Word has length 90 [2020-08-21 16:40:25,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:25,798 INFO L479 AbstractCegarLoop]: Abstraction has 94 states and 122 transitions. [2020-08-21 16:40:25,799 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 16:40:25,799 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 122 transitions. [2020-08-21 16:40:25,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2020-08-21 16:40:25,800 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:25,800 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:25,800 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 16:40:25,800 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:25,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:25,800 INFO L82 PathProgramCache]: Analyzing trace with hash 5326601, now seen corresponding path program 27 times [2020-08-21 16:40:25,801 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:25,801 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950944678] [2020-08-21 16:40:25,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:25,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:26,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:26,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:26,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1134 backedges. 0 proven. 1134 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:26,535 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950944678] [2020-08-21 16:40:26,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:26,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 16:40:26,536 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [563809140] [2020-08-21 16:40:26,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 16:40:26,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:26,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 16:40:26,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=931, Unknown=0, NotChecked=0, Total=992 [2020-08-21 16:40:26,537 INFO L87 Difference]: Start difference. First operand 94 states and 122 transitions. Second operand 32 states. [2020-08-21 16:40:27,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:27,681 INFO L93 Difference]: Finished difference Result 102 states and 131 transitions. [2020-08-21 16:40:27,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 16:40:27,682 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 93 [2020-08-21 16:40:27,682 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:27,683 INFO L225 Difference]: With dead ends: 102 [2020-08-21 16:40:27,683 INFO L226 Difference]: Without dead ends: 97 [2020-08-21 16:40:27,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=65, Invalid=991, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 16:40:27,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-08-21 16:40:27,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2020-08-21 16:40:27,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 16:40:27,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 126 transitions. [2020-08-21 16:40:27,692 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 126 transitions. Word has length 93 [2020-08-21 16:40:27,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:27,693 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 126 transitions. [2020-08-21 16:40:27,693 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 16:40:27,693 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 126 transitions. [2020-08-21 16:40:27,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 16:40:27,694 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:27,694 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:27,694 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 16:40:27,695 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:27,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:27,695 INFO L82 PathProgramCache]: Analyzing trace with hash -701403342, now seen corresponding path program 28 times [2020-08-21 16:40:27,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:27,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178280215] [2020-08-21 16:40:27,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:27,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:28,448 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:28,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:28,464 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 1218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:28,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178280215] [2020-08-21 16:40:28,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:28,465 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 16:40:28,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826320518] [2020-08-21 16:40:28,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 16:40:28,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:28,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 16:40:28,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 16:40:28,466 INFO L87 Difference]: Start difference. First operand 97 states and 126 transitions. Second operand 33 states. [2020-08-21 16:40:29,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:29,702 INFO L93 Difference]: Finished difference Result 105 states and 135 transitions. [2020-08-21 16:40:29,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 16:40:29,702 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 96 [2020-08-21 16:40:29,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:29,703 INFO L225 Difference]: With dead ends: 105 [2020-08-21 16:40:29,704 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 16:40:29,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=67, Invalid=1055, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 16:40:29,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 16:40:29,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2020-08-21 16:40:29,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-21 16:40:29,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 130 transitions. [2020-08-21 16:40:29,713 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 130 transitions. Word has length 96 [2020-08-21 16:40:29,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:29,714 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 130 transitions. [2020-08-21 16:40:29,714 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 16:40:29,714 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 130 transitions. [2020-08-21 16:40:29,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-08-21 16:40:29,715 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:29,715 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:29,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 16:40:29,716 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:29,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:29,716 INFO L82 PathProgramCache]: Analyzing trace with hash -963450263, now seen corresponding path program 29 times [2020-08-21 16:40:29,716 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:29,716 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [711542402] [2020-08-21 16:40:29,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:29,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:30,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:30,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:30,474 INFO L134 CoverageAnalysis]: Checked inductivity of 1305 backedges. 0 proven. 1305 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:30,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [711542402] [2020-08-21 16:40:30,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:30,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 16:40:30,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470916164] [2020-08-21 16:40:30,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 16:40:30,475 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:30,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 16:40:30,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=1057, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 16:40:30,476 INFO L87 Difference]: Start difference. First operand 100 states and 130 transitions. Second operand 34 states. [2020-08-21 16:40:31,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:31,790 INFO L93 Difference]: Finished difference Result 108 states and 139 transitions. [2020-08-21 16:40:31,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 16:40:31,790 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 99 [2020-08-21 16:40:31,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:31,792 INFO L225 Difference]: With dead ends: 108 [2020-08-21 16:40:31,792 INFO L226 Difference]: Without dead ends: 103 [2020-08-21 16:40:31,794 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=69, Invalid=1121, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 16:40:31,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-08-21 16:40:31,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 103. [2020-08-21 16:40:31,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 16:40:31,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 134 transitions. [2020-08-21 16:40:31,802 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 134 transitions. Word has length 99 [2020-08-21 16:40:31,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:31,803 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 134 transitions. [2020-08-21 16:40:31,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 16:40:31,803 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 134 transitions. [2020-08-21 16:40:31,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 16:40:31,804 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:31,804 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:31,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 16:40:31,804 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:31,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:31,805 INFO L82 PathProgramCache]: Analyzing trace with hash 647270354, now seen corresponding path program 30 times [2020-08-21 16:40:31,805 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:31,805 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [437290054] [2020-08-21 16:40:31,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:31,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:32,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:32,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:32,684 INFO L134 CoverageAnalysis]: Checked inductivity of 1395 backedges. 0 proven. 1395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:32,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [437290054] [2020-08-21 16:40:32,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:32,685 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 16:40:32,685 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011441580] [2020-08-21 16:40:32,686 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 16:40:32,686 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:32,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 16:40:32,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 16:40:32,687 INFO L87 Difference]: Start difference. First operand 103 states and 134 transitions. Second operand 35 states. [2020-08-21 16:40:34,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:34,103 INFO L93 Difference]: Finished difference Result 111 states and 143 transitions. [2020-08-21 16:40:34,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 16:40:34,103 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 102 [2020-08-21 16:40:34,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:34,105 INFO L225 Difference]: With dead ends: 111 [2020-08-21 16:40:34,105 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 16:40:34,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=71, Invalid=1189, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 16:40:34,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 16:40:34,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 106. [2020-08-21 16:40:34,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2020-08-21 16:40:34,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 138 transitions. [2020-08-21 16:40:34,113 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 138 transitions. Word has length 102 [2020-08-21 16:40:34,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:34,113 INFO L479 AbstractCegarLoop]: Abstraction has 106 states and 138 transitions. [2020-08-21 16:40:34,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 16:40:34,113 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 138 transitions. [2020-08-21 16:40:34,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2020-08-21 16:40:34,114 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:34,114 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:34,114 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 16:40:34,114 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:34,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:34,114 INFO L82 PathProgramCache]: Analyzing trace with hash -2044426807, now seen corresponding path program 31 times [2020-08-21 16:40:34,115 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:34,115 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1117123730] [2020-08-21 16:40:34,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:34,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:35,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:35,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:35,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1488 backedges. 0 proven. 1488 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:35,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1117123730] [2020-08-21 16:40:35,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:35,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 16:40:35,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421159820] [2020-08-21 16:40:35,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 16:40:35,047 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:35,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 16:40:35,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=1191, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 16:40:35,048 INFO L87 Difference]: Start difference. First operand 106 states and 138 transitions. Second operand 36 states. [2020-08-21 16:40:36,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:36,535 INFO L93 Difference]: Finished difference Result 114 states and 147 transitions. [2020-08-21 16:40:36,538 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 16:40:36,539 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 105 [2020-08-21 16:40:36,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:36,539 INFO L225 Difference]: With dead ends: 114 [2020-08-21 16:40:36,540 INFO L226 Difference]: Without dead ends: 109 [2020-08-21 16:40:36,540 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=73, Invalid=1259, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 16:40:36,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-08-21 16:40:36,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2020-08-21 16:40:36,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 16:40:36,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 142 transitions. [2020-08-21 16:40:36,549 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 142 transitions. Word has length 105 [2020-08-21 16:40:36,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:36,549 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 142 transitions. [2020-08-21 16:40:36,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 16:40:36,550 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 142 transitions. [2020-08-21 16:40:36,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 16:40:36,550 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:36,551 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:36,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 16:40:36,551 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:36,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:36,551 INFO L82 PathProgramCache]: Analyzing trace with hash 939833458, now seen corresponding path program 32 times [2020-08-21 16:40:36,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:36,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [947715413] [2020-08-21 16:40:36,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:36,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:37,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:37,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:37,487 INFO L134 CoverageAnalysis]: Checked inductivity of 1584 backedges. 0 proven. 1584 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:37,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [947715413] [2020-08-21 16:40:37,487 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:37,487 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 16:40:37,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1478785382] [2020-08-21 16:40:37,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 16:40:37,488 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:37,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 16:40:37,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 16:40:37,489 INFO L87 Difference]: Start difference. First operand 109 states and 142 transitions. Second operand 37 states. [2020-08-21 16:40:39,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:39,061 INFO L93 Difference]: Finished difference Result 117 states and 151 transitions. [2020-08-21 16:40:39,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 16:40:39,062 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 108 [2020-08-21 16:40:39,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:39,064 INFO L225 Difference]: With dead ends: 117 [2020-08-21 16:40:39,064 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 16:40:39,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=1331, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 16:40:39,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 16:40:39,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2020-08-21 16:40:39,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2020-08-21 16:40:39,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 146 transitions. [2020-08-21 16:40:39,073 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 146 transitions. Word has length 108 [2020-08-21 16:40:39,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:39,073 INFO L479 AbstractCegarLoop]: Abstraction has 112 states and 146 transitions. [2020-08-21 16:40:39,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 16:40:39,074 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 146 transitions. [2020-08-21 16:40:39,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2020-08-21 16:40:39,074 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:39,074 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:39,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 16:40:39,075 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:39,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:39,075 INFO L82 PathProgramCache]: Analyzing trace with hash -785639127, now seen corresponding path program 33 times [2020-08-21 16:40:39,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:39,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1307244623] [2020-08-21 16:40:39,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:39,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:40,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:40,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:40,094 INFO L134 CoverageAnalysis]: Checked inductivity of 1683 backedges. 0 proven. 1683 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:40,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1307244623] [2020-08-21 16:40:40,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:40,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 16:40:40,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344624541] [2020-08-21 16:40:40,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 16:40:40,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:40,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 16:40:40,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=1333, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 16:40:40,097 INFO L87 Difference]: Start difference. First operand 112 states and 146 transitions. Second operand 38 states. [2020-08-21 16:40:41,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:41,785 INFO L93 Difference]: Finished difference Result 120 states and 155 transitions. [2020-08-21 16:40:41,785 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 16:40:41,785 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 111 [2020-08-21 16:40:41,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:41,787 INFO L225 Difference]: With dead ends: 120 [2020-08-21 16:40:41,787 INFO L226 Difference]: Without dead ends: 115 [2020-08-21 16:40:41,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=77, Invalid=1405, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 16:40:41,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2020-08-21 16:40:41,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2020-08-21 16:40:41,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 16:40:41,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 150 transitions. [2020-08-21 16:40:41,798 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 150 transitions. Word has length 111 [2020-08-21 16:40:41,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:41,798 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 150 transitions. [2020-08-21 16:40:41,798 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 16:40:41,798 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 150 transitions. [2020-08-21 16:40:41,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 16:40:41,799 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:41,799 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:41,799 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 16:40:41,800 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:41,800 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:41,800 INFO L82 PathProgramCache]: Analyzing trace with hash 2124146962, now seen corresponding path program 34 times [2020-08-21 16:40:41,800 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:41,800 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [946415647] [2020-08-21 16:40:41,801 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:41,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:42,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:42,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:42,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1785 backedges. 0 proven. 1785 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:42,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [946415647] [2020-08-21 16:40:42,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:42,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 16:40:42,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410896431] [2020-08-21 16:40:42,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 16:40:42,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:42,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 16:40:42,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 16:40:42,848 INFO L87 Difference]: Start difference. First operand 115 states and 150 transitions. Second operand 39 states. [2020-08-21 16:40:44,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:44,643 INFO L93 Difference]: Finished difference Result 123 states and 159 transitions. [2020-08-21 16:40:44,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 16:40:44,644 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 114 [2020-08-21 16:40:44,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:44,646 INFO L225 Difference]: With dead ends: 123 [2020-08-21 16:40:44,646 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 16:40:44,647 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=79, Invalid=1481, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 16:40:44,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 16:40:44,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2020-08-21 16:40:44,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-08-21 16:40:44,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 154 transitions. [2020-08-21 16:40:44,656 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 154 transitions. Word has length 114 [2020-08-21 16:40:44,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:44,657 INFO L479 AbstractCegarLoop]: Abstraction has 118 states and 154 transitions. [2020-08-21 16:40:44,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 16:40:44,657 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 154 transitions. [2020-08-21 16:40:44,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-08-21 16:40:44,658 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:44,658 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:44,658 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 16:40:44,659 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:44,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:44,659 INFO L82 PathProgramCache]: Analyzing trace with hash -2058378103, now seen corresponding path program 35 times [2020-08-21 16:40:44,659 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:44,659 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1019048522] [2020-08-21 16:40:44,659 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:44,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:45,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:45,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:45,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1890 backedges. 0 proven. 1890 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:45,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1019048522] [2020-08-21 16:40:45,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:45,742 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 16:40:45,742 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1763240227] [2020-08-21 16:40:45,743 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 16:40:45,743 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:45,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 16:40:45,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=1483, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 16:40:45,744 INFO L87 Difference]: Start difference. First operand 118 states and 154 transitions. Second operand 40 states. [2020-08-21 16:40:47,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:47,601 INFO L93 Difference]: Finished difference Result 126 states and 163 transitions. [2020-08-21 16:40:47,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 16:40:47,604 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 117 [2020-08-21 16:40:47,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:47,606 INFO L225 Difference]: With dead ends: 126 [2020-08-21 16:40:47,606 INFO L226 Difference]: Without dead ends: 121 [2020-08-21 16:40:47,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=81, Invalid=1559, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 16:40:47,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-08-21 16:40:47,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2020-08-21 16:40:47,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 16:40:47,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 158 transitions. [2020-08-21 16:40:47,622 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 158 transitions. Word has length 117 [2020-08-21 16:40:47,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:47,623 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 158 transitions. [2020-08-21 16:40:47,623 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 16:40:47,623 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 158 transitions. [2020-08-21 16:40:47,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 16:40:47,624 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:47,624 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:47,624 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 16:40:47,624 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:47,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:47,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1928602034, now seen corresponding path program 36 times [2020-08-21 16:40:47,625 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:47,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348304168] [2020-08-21 16:40:47,625 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:47,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:48,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:48,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:48,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1998 backedges. 0 proven. 1998 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:48,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348304168] [2020-08-21 16:40:48,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:48,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 16:40:48,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1643324586] [2020-08-21 16:40:48,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 16:40:48,782 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:48,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 16:40:48,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 16:40:48,783 INFO L87 Difference]: Start difference. First operand 121 states and 158 transitions. Second operand 41 states. [2020-08-21 16:40:50,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:50,739 INFO L93 Difference]: Finished difference Result 129 states and 167 transitions. [2020-08-21 16:40:50,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 16:40:50,739 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 120 [2020-08-21 16:40:50,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:50,741 INFO L225 Difference]: With dead ends: 129 [2020-08-21 16:40:50,741 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 16:40:50,742 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=83, Invalid=1639, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 16:40:50,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 16:40:50,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 124. [2020-08-21 16:40:50,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2020-08-21 16:40:50,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 162 transitions. [2020-08-21 16:40:50,752 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 162 transitions. Word has length 120 [2020-08-21 16:40:50,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:50,752 INFO L479 AbstractCegarLoop]: Abstraction has 124 states and 162 transitions. [2020-08-21 16:40:50,752 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 16:40:50,752 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 162 transitions. [2020-08-21 16:40:50,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-08-21 16:40:50,753 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:50,753 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:50,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 16:40:50,754 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:50,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:50,754 INFO L82 PathProgramCache]: Analyzing trace with hash 733292521, now seen corresponding path program 37 times [2020-08-21 16:40:50,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:50,754 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2089323755] [2020-08-21 16:40:50,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:50,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:52,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:52,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:52,043 INFO L134 CoverageAnalysis]: Checked inductivity of 2109 backedges. 0 proven. 2109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:52,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2089323755] [2020-08-21 16:40:52,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:52,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 16:40:52,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17999754] [2020-08-21 16:40:52,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 16:40:52,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:52,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 16:40:52,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=1641, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 16:40:52,045 INFO L87 Difference]: Start difference. First operand 124 states and 162 transitions. Second operand 42 states. [2020-08-21 16:40:54,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:54,094 INFO L93 Difference]: Finished difference Result 132 states and 171 transitions. [2020-08-21 16:40:54,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 16:40:54,094 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 123 [2020-08-21 16:40:54,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:54,096 INFO L225 Difference]: With dead ends: 132 [2020-08-21 16:40:54,096 INFO L226 Difference]: Without dead ends: 127 [2020-08-21 16:40:54,097 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=85, Invalid=1721, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 16:40:54,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2020-08-21 16:40:54,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2020-08-21 16:40:54,108 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 16:40:54,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 166 transitions. [2020-08-21 16:40:54,109 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 166 transitions. Word has length 123 [2020-08-21 16:40:54,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:54,110 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 166 transitions. [2020-08-21 16:40:54,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 16:40:54,110 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 166 transitions. [2020-08-21 16:40:54,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 16:40:54,111 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:54,111 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:54,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 16:40:54,111 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:54,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:54,112 INFO L82 PathProgramCache]: Analyzing trace with hash 841441874, now seen corresponding path program 38 times [2020-08-21 16:40:54,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:54,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [306598604] [2020-08-21 16:40:54,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:54,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:55,414 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:55,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:55,446 INFO L134 CoverageAnalysis]: Checked inductivity of 2223 backedges. 0 proven. 2223 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:55,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [306598604] [2020-08-21 16:40:55,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:55,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 16:40:55,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814998792] [2020-08-21 16:40:55,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 16:40:55,448 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:55,448 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 16:40:55,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 16:40:55,449 INFO L87 Difference]: Start difference. First operand 127 states and 166 transitions. Second operand 43 states. [2020-08-21 16:40:57,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:40:57,611 INFO L93 Difference]: Finished difference Result 135 states and 175 transitions. [2020-08-21 16:40:57,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 16:40:57,612 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 126 [2020-08-21 16:40:57,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:40:57,613 INFO L225 Difference]: With dead ends: 135 [2020-08-21 16:40:57,613 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 16:40:57,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=1805, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 16:40:57,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 16:40:57,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 130. [2020-08-21 16:40:57,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2020-08-21 16:40:57,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 170 transitions. [2020-08-21 16:40:57,626 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 170 transitions. Word has length 126 [2020-08-21 16:40:57,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:40:57,627 INFO L479 AbstractCegarLoop]: Abstraction has 130 states and 170 transitions. [2020-08-21 16:40:57,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 16:40:57,627 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 170 transitions. [2020-08-21 16:40:57,628 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2020-08-21 16:40:57,628 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:40:57,628 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:40:57,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 16:40:57,628 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:40:57,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:40:57,629 INFO L82 PathProgramCache]: Analyzing trace with hash 1493345097, now seen corresponding path program 39 times [2020-08-21 16:40:57,629 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:40:57,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1565206320] [2020-08-21 16:40:57,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:40:57,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:58,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:40:58,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:40:59,016 INFO L134 CoverageAnalysis]: Checked inductivity of 2340 backedges. 0 proven. 2340 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:40:59,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1565206320] [2020-08-21 16:40:59,017 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:40:59,017 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 16:40:59,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1385554269] [2020-08-21 16:40:59,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 16:40:59,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:40:59,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 16:40:59,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=1807, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 16:40:59,019 INFO L87 Difference]: Start difference. First operand 130 states and 170 transitions. Second operand 44 states. [2020-08-21 16:41:01,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 16:41:01,369 INFO L93 Difference]: Finished difference Result 138 states and 179 transitions. [2020-08-21 16:41:01,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 16:41:01,370 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 129 [2020-08-21 16:41:01,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 16:41:01,372 INFO L225 Difference]: With dead ends: 138 [2020-08-21 16:41:01,372 INFO L226 Difference]: Without dead ends: 133 [2020-08-21 16:41:01,373 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=89, Invalid=1891, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 16:41:01,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-08-21 16:41:01,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2020-08-21 16:41:01,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-08-21 16:41:01,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 174 transitions. [2020-08-21 16:41:01,387 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 174 transitions. Word has length 129 [2020-08-21 16:41:01,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 16:41:01,388 INFO L479 AbstractCegarLoop]: Abstraction has 133 states and 174 transitions. [2020-08-21 16:41:01,388 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 16:41:01,388 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 174 transitions. [2020-08-21 16:41:01,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-08-21 16:41:01,389 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 16:41:01,389 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 16:41:01,389 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 16:41:01,389 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 16:41:01,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 16:41:01,390 INFO L82 PathProgramCache]: Analyzing trace with hash 500148978, now seen corresponding path program 40 times [2020-08-21 16:41:01,390 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 16:41:01,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1355175137] [2020-08-21 16:41:01,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 16:41:01,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:41:02,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 16:41:02,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 16:41:02,830 INFO L134 CoverageAnalysis]: Checked inductivity of 2460 backedges. 0 proven. 2460 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 16:41:02,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1355175137] [2020-08-21 16:41:02,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 16:41:02,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 16:41:02,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891974912] [2020-08-21 16:41:02,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 16:41:02,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 16:41:02,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 16:41:02,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=1893, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 16:41:02,832 INFO L87 Difference]: Start difference. First operand 133 states and 174 transitions. Second operand 45 states.