/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.8 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 01:32:55,813 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 01:32:55,816 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 01:32:55,842 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 01:32:55,842 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 01:32:55,843 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 01:32:55,845 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 01:32:55,846 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 01:32:55,848 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 01:32:55,849 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 01:32:55,850 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 01:32:55,851 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 01:32:55,851 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 01:32:55,854 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 01:32:55,855 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 01:32:55,856 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 01:32:55,863 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 01:32:55,864 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 01:32:55,865 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 01:32:55,871 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 01:32:55,873 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 01:32:55,877 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 01:32:55,878 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 01:32:55,879 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 01:32:55,884 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 01:32:55,898 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 01:32:55,899 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 01:32:55,900 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 01:32:55,901 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 01:32:55,952 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 01:32:55,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 01:32:55,956 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 01:32:55,956 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 01:32:55,957 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 01:32:55,957 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 01:32:55,957 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 01:32:55,957 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 01:32:55,958 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 01:32:55,958 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 01:32:55,958 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 01:32:55,958 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 01:32:55,958 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 01:32:55,959 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 01:32:55,959 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 01:32:55,959 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 01:32:55,959 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 01:32:55,959 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 01:32:55,960 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 01:32:55,961 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 01:32:55,961 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 01:32:55,961 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 01:32:55,962 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 01:32:55,962 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 01:32:55,962 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 01:32:55,962 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 01:32:55,963 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 01:32:55,963 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 01:32:55,963 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 01:32:55,963 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.8;log-additional-information=true; [2020-08-22 01:32:56,285 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 01:32:56,298 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 01:32:56,302 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 01:32:56,303 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 01:32:56,304 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 01:32:56,305 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-22 01:32:56,370 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dca27ffe6/be41307e06354ef69fae5e9e43e3389f/FLAGec5573662 [2020-08-22 01:32:56,809 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 01:32:56,809 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-22 01:32:56,817 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dca27ffe6/be41307e06354ef69fae5e9e43e3389f/FLAGec5573662 [2020-08-22 01:32:57,151 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/dca27ffe6/be41307e06354ef69fae5e9e43e3389f [2020-08-22 01:32:57,160 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 01:32:57,162 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 01:32:57,163 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 01:32:57,164 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 01:32:57,167 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 01:32:57,168 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,171 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@532b1c07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57, skipping insertion in model container [2020-08-22 01:32:57,172 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,180 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 01:32:57,200 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 01:32:57,417 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 01:32:57,426 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 01:32:57,459 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 01:32:57,475 INFO L208 MainTranslator]: Completed translation [2020-08-22 01:32:57,475 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57 WrapperNode [2020-08-22 01:32:57,475 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 01:32:57,476 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 01:32:57,476 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 01:32:57,477 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 01:32:57,491 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,491 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,497 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,497 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,588 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,596 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,598 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... [2020-08-22 01:32:57,599 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 01:32:57,601 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 01:32:57,601 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 01:32:57,601 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 01:32:57,602 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 01:32:57,661 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 01:32:57,661 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 01:32:57,662 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 01:32:57,662 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 01:32:57,662 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 01:32:57,662 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 01:32:57,662 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 01:32:57,662 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 01:32:57,663 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 01:32:57,835 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 01:32:57,835 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-22 01:32:57,839 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 01:32:57 BoogieIcfgContainer [2020-08-22 01:32:57,839 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 01:32:57,841 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 01:32:57,841 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 01:32:57,844 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 01:32:57,844 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 01:32:57" (1/3) ... [2020-08-22 01:32:57,845 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@80b7f2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 01:32:57, skipping insertion in model container [2020-08-22 01:32:57,845 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 01:32:57" (2/3) ... [2020-08-22 01:32:57,846 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@80b7f2e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 01:32:57, skipping insertion in model container [2020-08-22 01:32:57,846 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 01:32:57" (3/3) ... [2020-08-22 01:32:57,848 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-22 01:32:57,858 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 01:32:57,866 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 01:32:57,880 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 01:32:57,903 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 01:32:57,903 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 01:32:57,903 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 01:32:57,904 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 01:32:57,904 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 01:32:57,904 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 01:32:57,904 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 01:32:57,904 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 01:32:57,922 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-22 01:32:57,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 01:32:57,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:57,928 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:57,928 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:57,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:57,934 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-22 01:32:57,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:57,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1445365984] [2020-08-22 01:32:57,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:58,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:58,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,146 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:58,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1445365984] [2020-08-22 01:32:58,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 01:32:58,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 01:32:58,151 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [369598507] [2020-08-22 01:32:58,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 01:32:58,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:58,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 01:32:58,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 01:32:58,179 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-22 01:32:58,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:58,221 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 01:32:58,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 01:32:58,224 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 01:32:58,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:58,234 INFO L225 Difference]: With dead ends: 29 [2020-08-22 01:32:58,234 INFO L226 Difference]: Without dead ends: 12 [2020-08-22 01:32:58,238 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 01:32:58,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-22 01:32:58,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-22 01:32:58,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-22 01:32:58,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-22 01:32:58,280 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-22 01:32:58,280 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:58,280 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-22 01:32:58,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 01:32:58,281 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-22 01:32:58,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-22 01:32:58,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:58,281 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:58,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 01:32:58,282 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:58,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:58,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-22 01:32:58,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:58,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1584574856] [2020-08-22 01:32:58,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:58,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:58,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,416 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:58,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1584574856] [2020-08-22 01:32:58,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:58,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-22 01:32:58,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424323037] [2020-08-22 01:32:58,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 01:32:58,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:58,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 01:32:58,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 01:32:58,421 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-22 01:32:58,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:58,440 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-22 01:32:58,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 01:32:58,441 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-22 01:32:58,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:58,442 INFO L225 Difference]: With dead ends: 18 [2020-08-22 01:32:58,443 INFO L226 Difference]: Without dead ends: 13 [2020-08-22 01:32:58,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 01:32:58,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-22 01:32:58,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-22 01:32:58,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-22 01:32:58,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-22 01:32:58,449 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-22 01:32:58,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:58,450 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-22 01:32:58,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 01:32:58,450 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-22 01:32:58,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-22 01:32:58,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:58,451 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:58,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 01:32:58,452 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:58,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:58,453 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-22 01:32:58,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:58,453 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1882402607] [2020-08-22 01:32:58,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:58,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:58,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,583 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:58,584 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1882402607] [2020-08-22 01:32:58,584 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:58,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 01:32:58,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32699192] [2020-08-22 01:32:58,587 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 01:32:58,587 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:58,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 01:32:58,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 01:32:58,588 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-22 01:32:58,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:58,611 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-22 01:32:58,612 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 01:32:58,612 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-22 01:32:58,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:58,613 INFO L225 Difference]: With dead ends: 19 [2020-08-22 01:32:58,613 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 01:32:58,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 01:32:58,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 01:32:58,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 01:32:58,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 01:32:58,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-22 01:32:58,620 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-22 01:32:58,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:58,620 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-22 01:32:58,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 01:32:58,620 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-22 01:32:58,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-22 01:32:58,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:58,621 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:58,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 01:32:58,622 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:58,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:58,623 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-22 01:32:58,623 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:58,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [494769774] [2020-08-22 01:32:58,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:58,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:58,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,726 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:58,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [494769774] [2020-08-22 01:32:58,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:58,727 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 01:32:58,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [386814859] [2020-08-22 01:32:58,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 01:32:58,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:58,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 01:32:58,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 01:32:58,730 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-22 01:32:58,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:58,760 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-22 01:32:58,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 01:32:58,761 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-22 01:32:58,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:58,762 INFO L225 Difference]: With dead ends: 20 [2020-08-22 01:32:58,762 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 01:32:58,763 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-22 01:32:58,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 01:32:58,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 01:32:58,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 01:32:58,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-22 01:32:58,769 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-22 01:32:58,769 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:58,769 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-22 01:32:58,769 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 01:32:58,769 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-22 01:32:58,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 01:32:58,770 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:58,770 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:58,770 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 01:32:58,771 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:58,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:58,771 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-22 01:32:58,771 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:58,772 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56216811] [2020-08-22 01:32:58,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:58,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,894 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:58,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:58,898 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:58,898 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56216811] [2020-08-22 01:32:58,899 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:58,899 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 01:32:58,899 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723942399] [2020-08-22 01:32:58,900 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 01:32:58,900 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:58,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 01:32:58,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 01:32:58,901 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-22 01:32:58,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:58,938 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-22 01:32:58,939 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 01:32:58,939 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-22 01:32:58,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:58,940 INFO L225 Difference]: With dead ends: 21 [2020-08-22 01:32:58,940 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 01:32:58,941 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-22 01:32:58,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 01:32:58,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 01:32:58,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 01:32:58,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-22 01:32:58,946 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-22 01:32:58,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:58,947 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-22 01:32:58,947 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 01:32:58,947 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-22 01:32:58,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 01:32:58,948 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:58,948 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:58,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 01:32:58,949 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:58,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:58,949 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-22 01:32:58,950 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:58,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [912486560] [2020-08-22 01:32:58,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:58,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:59,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,109 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:59,109 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [912486560] [2020-08-22 01:32:59,110 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:59,110 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 01:32:59,110 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889277323] [2020-08-22 01:32:59,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 01:32:59,111 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:59,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 01:32:59,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 01:32:59,112 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-22 01:32:59,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:59,152 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-22 01:32:59,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 01:32:59,153 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-22 01:32:59,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:59,154 INFO L225 Difference]: With dead ends: 22 [2020-08-22 01:32:59,154 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 01:32:59,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-22 01:32:59,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 01:32:59,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 01:32:59,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 01:32:59,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-22 01:32:59,160 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-22 01:32:59,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:59,160 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-22 01:32:59,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 01:32:59,160 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-22 01:32:59,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 01:32:59,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:59,161 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:59,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 01:32:59,162 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:59,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:59,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-22 01:32:59,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:59,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212481675] [2020-08-22 01:32:59,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:59,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:59,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,287 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:59,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212481675] [2020-08-22 01:32:59,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:59,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 01:32:59,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [120980493] [2020-08-22 01:32:59,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 01:32:59,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:59,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 01:32:59,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 01:32:59,290 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-22 01:32:59,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:59,370 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-22 01:32:59,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 01:32:59,371 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-22 01:32:59,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:59,372 INFO L225 Difference]: With dead ends: 23 [2020-08-22 01:32:59,372 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 01:32:59,374 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-22 01:32:59,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 01:32:59,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 01:32:59,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 01:32:59,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-22 01:32:59,381 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-22 01:32:59,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:59,382 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-22 01:32:59,383 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 01:32:59,383 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-22 01:32:59,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 01:32:59,384 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:59,385 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:59,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 01:32:59,385 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:59,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:59,386 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-22 01:32:59,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:59,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2125951430] [2020-08-22 01:32:59,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:59,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:59,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,553 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:59,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2125951430] [2020-08-22 01:32:59,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:59,554 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 01:32:59,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2131076375] [2020-08-22 01:32:59,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 01:32:59,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:59,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 01:32:59,555 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 01:32:59,555 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-22 01:32:59,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:59,606 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-22 01:32:59,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 01:32:59,607 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-22 01:32:59,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:59,608 INFO L225 Difference]: With dead ends: 24 [2020-08-22 01:32:59,608 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 01:32:59,609 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-22 01:32:59,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 01:32:59,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-22 01:32:59,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-22 01:32:59,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-22 01:32:59,614 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-22 01:32:59,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:59,614 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-22 01:32:59,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 01:32:59,615 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-22 01:32:59,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 01:32:59,615 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:59,615 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:59,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 01:32:59,616 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:59,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:59,616 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-22 01:32:59,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:59,617 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [594344674] [2020-08-22 01:32:59,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:59,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:32:59,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:32:59,763 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:32:59,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [594344674] [2020-08-22 01:32:59,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:32:59,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 01:32:59,764 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [366196669] [2020-08-22 01:32:59,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 01:32:59,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:32:59,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 01:32:59,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 01:32:59,766 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-22 01:32:59,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:32:59,842 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-22 01:32:59,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 01:32:59,843 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-22 01:32:59,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:32:59,844 INFO L225 Difference]: With dead ends: 25 [2020-08-22 01:32:59,844 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 01:32:59,845 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-22 01:32:59,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 01:32:59,850 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 01:32:59,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 01:32:59,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-22 01:32:59,851 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-22 01:32:59,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:32:59,851 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-22 01:32:59,852 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 01:32:59,852 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-22 01:32:59,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 01:32:59,853 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:32:59,853 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:32:59,853 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 01:32:59,853 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:32:59,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:32:59,854 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-22 01:32:59,854 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:32:59,854 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391412473] [2020-08-22 01:32:59,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:32:59,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,047 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:00,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,049 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:00,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391412473] [2020-08-22 01:33:00,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:00,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 01:33:00,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183986568] [2020-08-22 01:33:00,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 01:33:00,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:00,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 01:33:00,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 01:33:00,052 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-22 01:33:00,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:00,128 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-22 01:33:00,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 01:33:00,129 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-22 01:33:00,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:00,129 INFO L225 Difference]: With dead ends: 26 [2020-08-22 01:33:00,129 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 01:33:00,130 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-22 01:33:00,130 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 01:33:00,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 01:33:00,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 01:33:00,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-22 01:33:00,135 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-22 01:33:00,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:00,135 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-22 01:33:00,135 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 01:33:00,136 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-22 01:33:00,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 01:33:00,136 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:00,136 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:00,137 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 01:33:00,137 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:00,137 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:00,137 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-22 01:33:00,137 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:00,138 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895404228] [2020-08-22 01:33:00,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:00,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:00,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,307 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:00,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895404228] [2020-08-22 01:33:00,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:00,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 01:33:00,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163214715] [2020-08-22 01:33:00,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 01:33:00,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:00,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 01:33:00,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 01:33:00,309 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-22 01:33:00,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:00,406 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-22 01:33:00,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 01:33:00,407 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-22 01:33:00,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:00,408 INFO L225 Difference]: With dead ends: 27 [2020-08-22 01:33:00,408 INFO L226 Difference]: Without dead ends: 22 [2020-08-22 01:33:00,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-22 01:33:00,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-22 01:33:00,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-22 01:33:00,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-22 01:33:00,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-22 01:33:00,413 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-22 01:33:00,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:00,413 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-22 01:33:00,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 01:33:00,414 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-22 01:33:00,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-22 01:33:00,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:00,414 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:00,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 01:33:00,415 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:00,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:00,415 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-22 01:33:00,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:00,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [687599574] [2020-08-22 01:33:00,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:00,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:00,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,608 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:00,608 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [687599574] [2020-08-22 01:33:00,608 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:00,609 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 01:33:00,609 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585984375] [2020-08-22 01:33:00,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 01:33:00,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:00,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 01:33:00,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 01:33:00,610 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-22 01:33:00,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:00,713 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-22 01:33:00,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 01:33:00,714 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-22 01:33:00,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:00,714 INFO L225 Difference]: With dead ends: 28 [2020-08-22 01:33:00,715 INFO L226 Difference]: Without dead ends: 23 [2020-08-22 01:33:00,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-22 01:33:00,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-22 01:33:00,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-22 01:33:00,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-22 01:33:00,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-22 01:33:00,720 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-22 01:33:00,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:00,720 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-22 01:33:00,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 01:33:00,721 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-22 01:33:00,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-22 01:33:00,721 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:00,721 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:00,722 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 01:33:00,722 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:00,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:00,722 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-22 01:33:00,722 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:00,723 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1457149178] [2020-08-22 01:33:00,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:00,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:00,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:00,944 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:00,944 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1457149178] [2020-08-22 01:33:00,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:00,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 01:33:00,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902687861] [2020-08-22 01:33:00,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 01:33:00,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:00,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 01:33:00,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 01:33:00,949 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-22 01:33:01,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:01,066 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-22 01:33:01,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 01:33:01,068 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-22 01:33:01,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:01,068 INFO L225 Difference]: With dead ends: 29 [2020-08-22 01:33:01,068 INFO L226 Difference]: Without dead ends: 24 [2020-08-22 01:33:01,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-22 01:33:01,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-22 01:33:01,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-22 01:33:01,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-22 01:33:01,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-22 01:33:01,074 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-22 01:33:01,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:01,074 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-22 01:33:01,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 01:33:01,075 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-22 01:33:01,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-22 01:33:01,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:01,075 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:01,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 01:33:01,076 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:01,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:01,076 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-22 01:33:01,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:01,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [28113738] [2020-08-22 01:33:01,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:01,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:01,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:01,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:01,307 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:01,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [28113738] [2020-08-22 01:33:01,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:01,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 01:33:01,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [75609226] [2020-08-22 01:33:01,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 01:33:01,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:01,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 01:33:01,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 01:33:01,310 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-22 01:33:01,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:01,450 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-22 01:33:01,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 01:33:01,451 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-22 01:33:01,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:01,452 INFO L225 Difference]: With dead ends: 30 [2020-08-22 01:33:01,452 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 01:33:01,453 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-22 01:33:01,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 01:33:01,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 01:33:01,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 01:33:01,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-22 01:33:01,460 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-22 01:33:01,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:01,461 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-22 01:33:01,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 01:33:01,461 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-22 01:33:01,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 01:33:01,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:01,464 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:01,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 01:33:01,465 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:01,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:01,465 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-22 01:33:01,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:01,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1627925378] [2020-08-22 01:33:01,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:01,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:01,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:01,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:01,786 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:01,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1627925378] [2020-08-22 01:33:01,787 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:01,787 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 01:33:01,787 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [520580074] [2020-08-22 01:33:01,788 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 01:33:01,788 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:01,788 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 01:33:01,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 01:33:01,789 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-22 01:33:01,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:01,984 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-22 01:33:01,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 01:33:01,984 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-22 01:33:01,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:01,985 INFO L225 Difference]: With dead ends: 31 [2020-08-22 01:33:01,985 INFO L226 Difference]: Without dead ends: 26 [2020-08-22 01:33:01,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-22 01:33:01,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-22 01:33:01,990 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-22 01:33:01,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-22 01:33:01,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-22 01:33:01,991 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-22 01:33:01,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:01,991 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-22 01:33:01,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 01:33:01,991 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-22 01:33:01,992 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-22 01:33:01,992 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:01,992 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:01,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 01:33:01,993 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:01,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:01,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-22 01:33:01,993 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:01,993 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233498445] [2020-08-22 01:33:01,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:02,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:02,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:02,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:02,261 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:02,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1233498445] [2020-08-22 01:33:02,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:02,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 01:33:02,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831508344] [2020-08-22 01:33:02,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 01:33:02,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:02,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 01:33:02,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 01:33:02,263 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-22 01:33:02,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:02,446 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-22 01:33:02,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 01:33:02,447 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-22 01:33:02,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:02,448 INFO L225 Difference]: With dead ends: 32 [2020-08-22 01:33:02,448 INFO L226 Difference]: Without dead ends: 27 [2020-08-22 01:33:02,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-22 01:33:02,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-22 01:33:02,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-22 01:33:02,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-22 01:33:02,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-22 01:33:02,454 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-22 01:33:02,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:02,455 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-22 01:33:02,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 01:33:02,455 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-22 01:33:02,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-22 01:33:02,456 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:02,456 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:02,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 01:33:02,456 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:02,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:02,457 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-22 01:33:02,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:02,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [280699753] [2020-08-22 01:33:02,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:02,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:02,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:02,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:02,807 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:02,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [280699753] [2020-08-22 01:33:02,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:02,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 01:33:02,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1048332660] [2020-08-22 01:33:02,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 01:33:02,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:02,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 01:33:02,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 01:33:02,809 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-22 01:33:02,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:02,996 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-22 01:33:02,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 01:33:02,998 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-22 01:33:02,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:02,999 INFO L225 Difference]: With dead ends: 33 [2020-08-22 01:33:02,999 INFO L226 Difference]: Without dead ends: 28 [2020-08-22 01:33:02,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-22 01:33:03,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-22 01:33:03,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-22 01:33:03,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-22 01:33:03,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-22 01:33:03,004 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-22 01:33:03,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:03,004 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-22 01:33:03,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 01:33:03,005 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-22 01:33:03,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-22 01:33:03,005 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:03,006 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:03,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 01:33:03,006 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:03,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:03,006 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-22 01:33:03,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:03,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99665999] [2020-08-22 01:33:03,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:03,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:03,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:03,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:03,327 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:03,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99665999] [2020-08-22 01:33:03,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:03,328 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 01:33:03,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973745939] [2020-08-22 01:33:03,329 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 01:33:03,329 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:03,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 01:33:03,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 01:33:03,330 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-22 01:33:03,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:03,556 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-22 01:33:03,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 01:33:03,557 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-22 01:33:03,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:03,558 INFO L225 Difference]: With dead ends: 34 [2020-08-22 01:33:03,558 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 01:33:03,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-22 01:33:03,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 01:33:03,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 01:33:03,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 01:33:03,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-22 01:33:03,563 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-22 01:33:03,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:03,564 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-22 01:33:03,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 01:33:03,564 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-22 01:33:03,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 01:33:03,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:03,565 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:03,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 01:33:03,565 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:03,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:03,565 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-22 01:33:03,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:03,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478321553] [2020-08-22 01:33:03,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:03,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:03,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:03,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:03,891 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:03,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478321553] [2020-08-22 01:33:03,892 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:03,892 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 01:33:03,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383202350] [2020-08-22 01:33:03,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 01:33:03,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:03,893 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 01:33:03,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 01:33:03,894 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-22 01:33:04,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:04,143 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-22 01:33:04,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 01:33:04,144 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-22 01:33:04,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:04,145 INFO L225 Difference]: With dead ends: 35 [2020-08-22 01:33:04,145 INFO L226 Difference]: Without dead ends: 30 [2020-08-22 01:33:04,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-22 01:33:04,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-22 01:33:04,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-22 01:33:04,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-22 01:33:04,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-22 01:33:04,150 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-22 01:33:04,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:04,150 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-22 01:33:04,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 01:33:04,151 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-22 01:33:04,151 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 01:33:04,151 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:04,151 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:04,152 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 01:33:04,152 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:04,152 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:04,152 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-22 01:33:04,152 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:04,153 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2117261024] [2020-08-22 01:33:04,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:04,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:04,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:04,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:04,518 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:04,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2117261024] [2020-08-22 01:33:04,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:04,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 01:33:04,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [722098465] [2020-08-22 01:33:04,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 01:33:04,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:04,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 01:33:04,520 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 01:33:04,520 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-22 01:33:04,800 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:04,800 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-22 01:33:04,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 01:33:04,801 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-22 01:33:04,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:04,801 INFO L225 Difference]: With dead ends: 36 [2020-08-22 01:33:04,802 INFO L226 Difference]: Without dead ends: 31 [2020-08-22 01:33:04,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-22 01:33:04,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-22 01:33:04,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-22 01:33:04,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-22 01:33:04,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-22 01:33:04,809 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-22 01:33:04,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:04,810 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-22 01:33:04,810 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 01:33:04,810 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-22 01:33:04,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-22 01:33:04,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:04,812 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:04,812 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 01:33:04,813 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:04,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:04,813 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-22 01:33:04,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:04,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [11881156] [2020-08-22 01:33:04,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:04,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:05,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:05,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:05,215 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:05,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [11881156] [2020-08-22 01:33:05,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:05,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 01:33:05,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1293647274] [2020-08-22 01:33:05,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 01:33:05,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:05,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 01:33:05,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 01:33:05,218 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-22 01:33:05,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:05,488 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-22 01:33:05,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 01:33:05,489 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-22 01:33:05,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:05,489 INFO L225 Difference]: With dead ends: 37 [2020-08-22 01:33:05,490 INFO L226 Difference]: Without dead ends: 32 [2020-08-22 01:33:05,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-22 01:33:05,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-22 01:33:05,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-22 01:33:05,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-22 01:33:05,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-22 01:33:05,496 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-22 01:33:05,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:05,496 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-22 01:33:05,496 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 01:33:05,496 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-22 01:33:05,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-22 01:33:05,497 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:05,497 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:05,497 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 01:33:05,497 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:05,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:05,498 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-22 01:33:05,498 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:05,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741395410] [2020-08-22 01:33:05,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:05,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:05,974 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:05,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:05,978 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:05,978 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741395410] [2020-08-22 01:33:05,978 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:05,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 01:33:05,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356590250] [2020-08-22 01:33:05,979 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 01:33:05,979 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:05,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 01:33:05,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 01:33:05,980 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-22 01:33:06,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:06,267 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-22 01:33:06,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 01:33:06,270 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-22 01:33:06,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:06,271 INFO L225 Difference]: With dead ends: 38 [2020-08-22 01:33:06,271 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 01:33:06,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-22 01:33:06,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 01:33:06,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 01:33:06,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 01:33:06,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-22 01:33:06,277 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-22 01:33:06,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:06,277 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-22 01:33:06,277 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 01:33:06,277 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-22 01:33:06,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 01:33:06,278 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:06,278 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:06,278 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 01:33:06,278 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:06,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:06,279 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-22 01:33:06,279 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:06,279 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023374044] [2020-08-22 01:33:06,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:06,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:06,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:06,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:06,764 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:06,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023374044] [2020-08-22 01:33:06,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:06,764 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 01:33:06,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711314272] [2020-08-22 01:33:06,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 01:33:06,765 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:06,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 01:33:06,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 01:33:06,766 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-22 01:33:07,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:07,137 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-22 01:33:07,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 01:33:07,138 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-22 01:33:07,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:07,138 INFO L225 Difference]: With dead ends: 39 [2020-08-22 01:33:07,139 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 01:33:07,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-22 01:33:07,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 01:33:07,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-22 01:33:07,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 01:33:07,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-22 01:33:07,151 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-22 01:33:07,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:07,151 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-22 01:33:07,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 01:33:07,151 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-22 01:33:07,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 01:33:07,156 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:07,156 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:07,156 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 01:33:07,156 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:07,158 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:07,158 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-22 01:33:07,158 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:07,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387820276] [2020-08-22 01:33:07,159 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:07,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:07,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:07,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:07,791 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:07,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387820276] [2020-08-22 01:33:07,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:07,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-22 01:33:07,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472944572] [2020-08-22 01:33:07,794 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-22 01:33:07,794 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:07,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-22 01:33:07,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 01:33:07,795 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-22 01:33:08,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:08,153 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-22 01:33:08,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-22 01:33:08,154 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-22 01:33:08,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:08,154 INFO L225 Difference]: With dead ends: 40 [2020-08-22 01:33:08,155 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 01:33:08,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-22 01:33:08,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 01:33:08,160 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 01:33:08,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 01:33:08,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-22 01:33:08,161 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-22 01:33:08,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:08,161 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-22 01:33:08,161 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-22 01:33:08,161 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-22 01:33:08,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 01:33:08,162 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:08,162 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:08,164 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 01:33:08,165 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:08,166 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:08,166 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-22 01:33:08,166 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:08,166 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [481044445] [2020-08-22 01:33:08,166 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:08,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:08,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:08,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:08,741 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:08,741 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [481044445] [2020-08-22 01:33:08,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:08,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-22 01:33:08,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326695122] [2020-08-22 01:33:08,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-22 01:33:08,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:08,742 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-22 01:33:08,742 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 01:33:08,743 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-22 01:33:09,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:09,117 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-22 01:33:09,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-22 01:33:09,118 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-22 01:33:09,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:09,119 INFO L225 Difference]: With dead ends: 41 [2020-08-22 01:33:09,119 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 01:33:09,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-22 01:33:09,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 01:33:09,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 01:33:09,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 01:33:09,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-22 01:33:09,125 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-22 01:33:09,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:09,125 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-22 01:33:09,125 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-22 01:33:09,125 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-22 01:33:09,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 01:33:09,126 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:09,126 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:09,126 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 01:33:09,127 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:09,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:09,127 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-22 01:33:09,127 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:09,127 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395862002] [2020-08-22 01:33:09,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:09,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:09,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:09,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:09,729 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:09,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395862002] [2020-08-22 01:33:09,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:09,730 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-22 01:33:09,730 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [592126896] [2020-08-22 01:33:09,731 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-22 01:33:09,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:09,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-22 01:33:09,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 01:33:09,733 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-22 01:33:10,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:10,093 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-22 01:33:10,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-22 01:33:10,094 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-22 01:33:10,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:10,095 INFO L225 Difference]: With dead ends: 42 [2020-08-22 01:33:10,095 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 01:33:10,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-22 01:33:10,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 01:33:10,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 01:33:10,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 01:33:10,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-22 01:33:10,099 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-22 01:33:10,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:10,100 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-22 01:33:10,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-22 01:33:10,100 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-22 01:33:10,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 01:33:10,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:10,101 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:10,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 01:33:10,101 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:10,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:10,101 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-22 01:33:10,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:10,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [491145453] [2020-08-22 01:33:10,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:10,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:10,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:10,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:10,709 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:10,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [491145453] [2020-08-22 01:33:10,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:10,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-22 01:33:10,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [887767174] [2020-08-22 01:33:10,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-22 01:33:10,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:10,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-22 01:33:10,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 01:33:10,711 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-22 01:33:11,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:11,191 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-22 01:33:11,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-22 01:33:11,192 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-22 01:33:11,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:11,193 INFO L225 Difference]: With dead ends: 43 [2020-08-22 01:33:11,193 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 01:33:11,194 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-22 01:33:11,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 01:33:11,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 01:33:11,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 01:33:11,199 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-22 01:33:11,200 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-22 01:33:11,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:11,200 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-22 01:33:11,200 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-22 01:33:11,200 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-22 01:33:11,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 01:33:11,201 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:11,201 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:11,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 01:33:11,201 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:11,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:11,202 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-22 01:33:11,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:11,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364754648] [2020-08-22 01:33:11,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:11,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:11,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:11,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:11,861 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:11,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364754648] [2020-08-22 01:33:11,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:11,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-22 01:33:11,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684328093] [2020-08-22 01:33:11,862 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-22 01:33:11,862 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:11,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-22 01:33:11,863 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 01:33:11,863 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-22 01:33:12,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:12,392 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-22 01:33:12,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-22 01:33:12,393 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-22 01:33:12,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:12,394 INFO L225 Difference]: With dead ends: 44 [2020-08-22 01:33:12,394 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 01:33:12,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-22 01:33:12,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 01:33:12,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 01:33:12,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 01:33:12,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-22 01:33:12,398 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-22 01:33:12,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:12,399 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-22 01:33:12,399 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-22 01:33:12,399 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-22 01:33:12,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 01:33:12,399 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:12,399 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:12,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 01:33:12,400 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:12,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:12,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-22 01:33:12,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:12,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29574746] [2020-08-22 01:33:12,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:12,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:13,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:13,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:13,149 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:13,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29574746] [2020-08-22 01:33:13,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:13,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-22 01:33:13,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [271522302] [2020-08-22 01:33:13,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-22 01:33:13,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:13,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-22 01:33:13,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 01:33:13,151 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-22 01:33:13,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:13,689 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-22 01:33:13,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-22 01:33:13,690 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-22 01:33:13,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:13,691 INFO L225 Difference]: With dead ends: 45 [2020-08-22 01:33:13,691 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 01:33:13,692 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-22 01:33:13,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 01:33:13,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-22 01:33:13,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 01:33:13,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-22 01:33:13,697 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-22 01:33:13,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:13,697 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-22 01:33:13,697 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-22 01:33:13,697 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-22 01:33:13,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 01:33:13,698 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:13,698 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:13,698 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-22 01:33:13,698 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:13,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:13,699 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-22 01:33:13,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:13,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444959171] [2020-08-22 01:33:13,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:13,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:14,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:14,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:14,436 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:14,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444959171] [2020-08-22 01:33:14,437 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:14,437 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-22 01:33:14,437 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237519596] [2020-08-22 01:33:14,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-22 01:33:14,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:14,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-22 01:33:14,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 01:33:14,438 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-22 01:33:15,015 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:15,015 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-22 01:33:15,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-22 01:33:15,016 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-22 01:33:15,016 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:15,016 INFO L225 Difference]: With dead ends: 46 [2020-08-22 01:33:15,016 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 01:33:15,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-22 01:33:15,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 01:33:15,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 01:33:15,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 01:33:15,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-22 01:33:15,021 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-22 01:33:15,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:15,022 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-22 01:33:15,022 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-22 01:33:15,022 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-22 01:33:15,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 01:33:15,022 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:15,023 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:15,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-22 01:33:15,023 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:15,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:15,023 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-22 01:33:15,024 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:15,024 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1354150502] [2020-08-22 01:33:15,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:15,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:15,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:15,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:15,823 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:15,823 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1354150502] [2020-08-22 01:33:15,823 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:15,823 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-22 01:33:15,823 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298872315] [2020-08-22 01:33:15,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-22 01:33:15,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:15,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-22 01:33:15,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 01:33:15,825 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-22 01:33:16,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:16,446 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-22 01:33:16,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-22 01:33:16,448 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-22 01:33:16,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:16,449 INFO L225 Difference]: With dead ends: 47 [2020-08-22 01:33:16,449 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 01:33:16,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 01:33:16,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 01:33:16,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 01:33:16,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 01:33:16,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-22 01:33:16,454 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-22 01:33:16,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:16,454 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-22 01:33:16,454 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-22 01:33:16,454 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-22 01:33:16,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 01:33:16,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:16,455 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:16,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-22 01:33:16,456 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:16,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:16,456 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-22 01:33:16,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:16,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [137914509] [2020-08-22 01:33:16,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:16,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:17,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:17,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:17,259 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:17,259 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [137914509] [2020-08-22 01:33:17,259 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:17,260 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-22 01:33:17,260 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339882222] [2020-08-22 01:33:17,260 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-22 01:33:17,260 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:17,260 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-22 01:33:17,261 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 01:33:17,261 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-22 01:33:17,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:17,928 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-22 01:33:17,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-22 01:33:17,928 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-22 01:33:17,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:17,929 INFO L225 Difference]: With dead ends: 48 [2020-08-22 01:33:17,929 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 01:33:17,930 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-22 01:33:17,930 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 01:33:17,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 01:33:17,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 01:33:17,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-22 01:33:17,933 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-22 01:33:17,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:17,933 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-22 01:33:17,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-22 01:33:17,934 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-22 01:33:17,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 01:33:17,934 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:17,934 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:17,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-22 01:33:17,934 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:17,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:17,935 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-22 01:33:17,935 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:17,935 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1427172587] [2020-08-22 01:33:17,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:17,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:18,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:18,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:18,809 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:18,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1427172587] [2020-08-22 01:33:18,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:18,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-22 01:33:18,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506852282] [2020-08-22 01:33:18,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-22 01:33:18,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:18,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-22 01:33:18,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 01:33:18,812 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-22 01:33:19,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:19,517 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-22 01:33:19,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-22 01:33:19,518 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-22 01:33:19,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:19,518 INFO L225 Difference]: With dead ends: 49 [2020-08-22 01:33:19,518 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 01:33:19,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 01:33:19,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 01:33:19,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 01:33:19,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 01:33:19,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-22 01:33:19,523 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-22 01:33:19,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:19,523 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-22 01:33:19,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-22 01:33:19,524 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-22 01:33:19,524 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 01:33:19,524 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:19,524 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:19,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-22 01:33:19,525 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:19,525 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:19,525 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-22 01:33:19,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:19,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430806191] [2020-08-22 01:33:19,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:19,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:20,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:20,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:20,464 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:20,464 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430806191] [2020-08-22 01:33:20,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:20,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-22 01:33:20,465 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261660274] [2020-08-22 01:33:20,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-22 01:33:20,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:20,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-22 01:33:20,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 01:33:20,467 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-22 01:33:21,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:21,217 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-22 01:33:21,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-22 01:33:21,218 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-22 01:33:21,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:21,219 INFO L225 Difference]: With dead ends: 50 [2020-08-22 01:33:21,219 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 01:33:21,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-22 01:33:21,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 01:33:21,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 01:33:21,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 01:33:21,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-22 01:33:21,223 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-22 01:33:21,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:21,223 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-22 01:33:21,223 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-22 01:33:21,224 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-22 01:33:21,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 01:33:21,224 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:21,224 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:21,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-22 01:33:21,225 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:21,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:21,225 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-22 01:33:21,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:21,225 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581599961] [2020-08-22 01:33:21,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:21,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:22,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:22,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:22,205 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:22,205 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581599961] [2020-08-22 01:33:22,205 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:22,206 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-22 01:33:22,206 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [88430229] [2020-08-22 01:33:22,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-22 01:33:22,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:22,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-22 01:33:22,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 01:33:22,207 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-22 01:33:23,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:23,013 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-22 01:33:23,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-22 01:33:23,013 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-22 01:33:23,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:23,014 INFO L225 Difference]: With dead ends: 51 [2020-08-22 01:33:23,014 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 01:33:23,015 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 01:33:23,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 01:33:23,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-22 01:33:23,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 01:33:23,023 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-22 01:33:23,023 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-22 01:33:23,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:23,024 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-22 01:33:23,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-22 01:33:23,026 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-22 01:33:23,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 01:33:23,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:23,027 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:23,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-22 01:33:23,027 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:23,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:23,028 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-22 01:33:23,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:23,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [993948274] [2020-08-22 01:33:23,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:23,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:24,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:24,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:24,050 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:24,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [993948274] [2020-08-22 01:33:24,050 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:24,050 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-22 01:33:24,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909717112] [2020-08-22 01:33:24,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-22 01:33:24,051 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:24,051 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-22 01:33:24,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 01:33:24,052 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-22 01:33:24,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:24,884 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-22 01:33:24,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-22 01:33:24,885 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-22 01:33:24,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:24,885 INFO L225 Difference]: With dead ends: 52 [2020-08-22 01:33:24,886 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 01:33:24,886 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-22 01:33:24,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 01:33:24,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 01:33:24,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 01:33:24,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-22 01:33:24,892 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-22 01:33:24,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:24,892 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-22 01:33:24,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-22 01:33:24,892 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-22 01:33:24,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 01:33:24,893 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:24,893 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:24,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-22 01:33:24,893 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:24,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:24,894 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-22 01:33:24,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:24,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [344173956] [2020-08-22 01:33:24,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:24,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:25,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:25,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:25,909 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:25,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [344173956] [2020-08-22 01:33:25,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:25,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-22 01:33:25,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1815228072] [2020-08-22 01:33:25,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-22 01:33:25,910 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:25,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-22 01:33:25,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 01:33:25,911 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-22 01:33:26,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:26,809 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-22 01:33:26,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-22 01:33:26,810 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-22 01:33:26,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:26,811 INFO L225 Difference]: With dead ends: 53 [2020-08-22 01:33:26,811 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 01:33:26,812 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 01:33:26,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 01:33:26,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-22 01:33:26,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 01:33:26,815 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-22 01:33:26,815 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-22 01:33:26,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:26,815 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-22 01:33:26,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-22 01:33:26,815 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-22 01:33:26,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 01:33:26,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:26,816 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:26,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-22 01:33:26,817 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:26,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:26,817 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-22 01:33:26,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:26,817 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [246546393] [2020-08-22 01:33:26,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:26,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:27,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:27,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:27,851 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:27,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [246546393] [2020-08-22 01:33:27,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:27,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-22 01:33:27,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673098584] [2020-08-22 01:33:27,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-22 01:33:27,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:27,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-22 01:33:27,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 01:33:27,853 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-22 01:33:28,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:28,797 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-22 01:33:28,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-22 01:33:28,798 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-22 01:33:28,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:28,799 INFO L225 Difference]: With dead ends: 54 [2020-08-22 01:33:28,799 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 01:33:28,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-22 01:33:28,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 01:33:28,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 01:33:28,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 01:33:28,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-22 01:33:28,805 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-22 01:33:28,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:28,805 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-22 01:33:28,805 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-22 01:33:28,805 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-22 01:33:28,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 01:33:28,806 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:28,806 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:28,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-22 01:33:28,806 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:28,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:28,806 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-22 01:33:28,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:28,807 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [476993975] [2020-08-22 01:33:28,807 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:28,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:29,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:29,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:29,941 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:29,941 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [476993975] [2020-08-22 01:33:29,941 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:29,941 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-22 01:33:29,941 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376585200] [2020-08-22 01:33:29,942 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-22 01:33:29,942 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:29,942 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-22 01:33:29,943 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 01:33:29,943 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-22 01:33:30,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:30,946 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-22 01:33:30,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-22 01:33:30,947 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-22 01:33:30,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:30,948 INFO L225 Difference]: With dead ends: 55 [2020-08-22 01:33:30,948 INFO L226 Difference]: Without dead ends: 50 [2020-08-22 01:33:30,949 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 01:33:30,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-22 01:33:30,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-22 01:33:30,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-22 01:33:30,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-22 01:33:30,953 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-22 01:33:30,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:30,953 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-22 01:33:30,953 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-22 01:33:30,953 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-22 01:33:30,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-22 01:33:30,953 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:30,953 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:30,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-22 01:33:30,954 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:30,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:30,954 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-22 01:33:30,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:30,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1623456299] [2020-08-22 01:33:30,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:30,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:32,180 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:32,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:32,186 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:32,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1623456299] [2020-08-22 01:33:32,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:32,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-22 01:33:32,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058134405] [2020-08-22 01:33:32,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-22 01:33:32,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:32,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-22 01:33:32,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 01:33:32,188 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-22 01:33:33,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:33,241 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-22 01:33:33,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-22 01:33:33,242 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-22 01:33:33,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:33,243 INFO L225 Difference]: With dead ends: 56 [2020-08-22 01:33:33,243 INFO L226 Difference]: Without dead ends: 51 [2020-08-22 01:33:33,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-22 01:33:33,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-22 01:33:33,247 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-22 01:33:33,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-22 01:33:33,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-22 01:33:33,248 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-22 01:33:33,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:33,249 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-22 01:33:33,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-22 01:33:33,249 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-22 01:33:33,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-22 01:33:33,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:33,249 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:33,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-22 01:33:33,250 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:33,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:33,250 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-22 01:33:33,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:33,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257043886] [2020-08-22 01:33:33,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:33,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:34,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:34,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:34,796 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:34,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257043886] [2020-08-22 01:33:34,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:34,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-22 01:33:34,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1901365456] [2020-08-22 01:33:34,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-22 01:33:34,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:34,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-22 01:33:34,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 01:33:34,798 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-22 01:33:35,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:35,900 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-22 01:33:35,901 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-22 01:33:35,901 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-22 01:33:35,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:35,902 INFO L225 Difference]: With dead ends: 57 [2020-08-22 01:33:35,902 INFO L226 Difference]: Without dead ends: 52 [2020-08-22 01:33:35,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 01:33:35,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-22 01:33:35,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-22 01:33:35,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-22 01:33:35,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-22 01:33:35,907 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-22 01:33:35,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:35,908 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-22 01:33:35,908 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-22 01:33:35,908 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-22 01:33:35,908 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 01:33:35,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:35,909 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:35,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-22 01:33:35,909 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:35,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:35,909 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-22 01:33:35,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:35,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1323314333] [2020-08-22 01:33:35,910 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:35,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:37,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:37,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:37,228 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:37,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1323314333] [2020-08-22 01:33:37,229 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:37,229 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-22 01:33:37,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1664899114] [2020-08-22 01:33:37,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-22 01:33:37,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:37,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-22 01:33:37,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 01:33:37,230 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-22 01:33:38,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:38,404 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-22 01:33:38,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-22 01:33:38,405 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-22 01:33:38,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:38,405 INFO L225 Difference]: With dead ends: 58 [2020-08-22 01:33:38,405 INFO L226 Difference]: Without dead ends: 53 [2020-08-22 01:33:38,406 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-22 01:33:38,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-22 01:33:38,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-22 01:33:38,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-22 01:33:38,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-22 01:33:38,410 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-22 01:33:38,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:38,410 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-22 01:33:38,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-22 01:33:38,410 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-22 01:33:38,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-22 01:33:38,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:38,411 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:38,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-22 01:33:38,411 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:38,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:38,412 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-22 01:33:38,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:38,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252276526] [2020-08-22 01:33:38,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:38,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:39,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:39,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:39,751 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:39,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252276526] [2020-08-22 01:33:39,752 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:39,752 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-22 01:33:39,752 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019621660] [2020-08-22 01:33:39,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-22 01:33:39,752 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:39,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-22 01:33:39,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 01:33:39,754 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-22 01:33:40,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:40,928 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-22 01:33:40,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-22 01:33:40,930 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-22 01:33:40,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:40,931 INFO L225 Difference]: With dead ends: 59 [2020-08-22 01:33:40,931 INFO L226 Difference]: Without dead ends: 54 [2020-08-22 01:33:40,932 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 01:33:40,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-22 01:33:40,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-22 01:33:40,936 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-22 01:33:40,936 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-22 01:33:40,936 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-22 01:33:40,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:40,937 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-22 01:33:40,937 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-22 01:33:40,937 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-22 01:33:40,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-22 01:33:40,937 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:40,937 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:40,938 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-22 01:33:40,938 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:40,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:40,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-22 01:33:40,938 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:40,938 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049998795] [2020-08-22 01:33:40,939 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:40,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:42,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:42,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:42,375 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:42,375 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049998795] [2020-08-22 01:33:42,375 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:42,375 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-22 01:33:42,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710097075] [2020-08-22 01:33:42,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-22 01:33:42,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:42,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-22 01:33:42,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 01:33:42,377 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-22 01:33:43,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:43,655 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-22 01:33:43,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-22 01:33:43,656 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-22 01:33:43,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:43,657 INFO L225 Difference]: With dead ends: 60 [2020-08-22 01:33:43,657 INFO L226 Difference]: Without dead ends: 55 [2020-08-22 01:33:43,657 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-22 01:33:43,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-22 01:33:43,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-22 01:33:43,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 01:33:43,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-22 01:33:43,660 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-22 01:33:43,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:43,660 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-22 01:33:43,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-22 01:33:43,661 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-22 01:33:43,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-22 01:33:43,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:43,661 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:43,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-22 01:33:43,661 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:43,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:43,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-22 01:33:43,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:43,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [752909780] [2020-08-22 01:33:43,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:43,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:45,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:45,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:45,208 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:45,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [752909780] [2020-08-22 01:33:45,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:45,209 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-22 01:33:45,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599110567] [2020-08-22 01:33:45,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-22 01:33:45,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:45,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-22 01:33:45,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 01:33:45,210 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-22 01:33:46,536 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:46,537 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-22 01:33:46,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-22 01:33:46,537 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-22 01:33:46,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:46,538 INFO L225 Difference]: With dead ends: 61 [2020-08-22 01:33:46,538 INFO L226 Difference]: Without dead ends: 56 [2020-08-22 01:33:46,539 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 01:33:46,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-22 01:33:46,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-22 01:33:46,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-22 01:33:46,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-22 01:33:46,543 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-22 01:33:46,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:46,543 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-22 01:33:46,543 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-22 01:33:46,543 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-22 01:33:46,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-22 01:33:46,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:46,544 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:46,544 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-22 01:33:46,544 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:46,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:46,544 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-22 01:33:46,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:46,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069589062] [2020-08-22 01:33:46,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:46,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:48,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:48,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:48,129 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:48,130 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069589062] [2020-08-22 01:33:48,130 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:48,130 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-22 01:33:48,130 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92844310] [2020-08-22 01:33:48,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-22 01:33:48,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:48,131 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-22 01:33:48,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 01:33:48,131 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-22 01:33:49,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:49,435 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-22 01:33:49,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-22 01:33:49,435 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-22 01:33:49,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:49,436 INFO L225 Difference]: With dead ends: 62 [2020-08-22 01:33:49,436 INFO L226 Difference]: Without dead ends: 57 [2020-08-22 01:33:49,437 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-22 01:33:49,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-22 01:33:49,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-22 01:33:49,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 01:33:49,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-22 01:33:49,442 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-22 01:33:49,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:49,443 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-22 01:33:49,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-22 01:33:49,443 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-22 01:33:49,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-22 01:33:49,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:49,444 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:49,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-22 01:33:49,444 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:49,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:49,444 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-22 01:33:49,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:49,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444656397] [2020-08-22 01:33:49,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:49,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:51,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:51,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:51,152 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:51,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444656397] [2020-08-22 01:33:51,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:51,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-22 01:33:51,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [42182965] [2020-08-22 01:33:51,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-22 01:33:51,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:51,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-22 01:33:51,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 01:33:51,157 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-22 01:33:52,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:52,548 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-22 01:33:52,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-22 01:33:52,549 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-22 01:33:52,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:52,550 INFO L225 Difference]: With dead ends: 63 [2020-08-22 01:33:52,550 INFO L226 Difference]: Without dead ends: 58 [2020-08-22 01:33:52,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-22 01:33:52,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-22 01:33:52,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-22 01:33:52,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-22 01:33:52,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-22 01:33:52,555 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-22 01:33:52,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:52,555 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-22 01:33:52,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-22 01:33:52,555 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-22 01:33:52,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-22 01:33:52,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:52,555 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:52,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-22 01:33:52,556 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:52,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:52,556 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-22 01:33:52,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:52,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [956327658] [2020-08-22 01:33:52,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:52,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:54,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 01:33:54,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 01:33:54,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 01:33:54,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [956327658] [2020-08-22 01:33:54,231 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 01:33:54,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-22 01:33:54,233 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129715892] [2020-08-22 01:33:54,233 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-22 01:33:54,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 01:33:54,234 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-22 01:33:54,234 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-22 01:33:54,236 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states. [2020-08-22 01:33:55,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 01:33:55,722 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-22 01:33:55,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-22 01:33:55,723 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 57 [2020-08-22 01:33:55,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 01:33:55,724 INFO L225 Difference]: With dead ends: 64 [2020-08-22 01:33:55,724 INFO L226 Difference]: Without dead ends: 59 [2020-08-22 01:33:55,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-22 01:33:55,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-22 01:33:55,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-08-22 01:33:55,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-22 01:33:55,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-22 01:33:55,729 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 57 [2020-08-22 01:33:55,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 01:33:55,730 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-22 01:33:55,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-22 01:33:55,730 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-22 01:33:55,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-22 01:33:55,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 01:33:55,730 INFO L422 BasicCegarLoop]: trace histogram [48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 01:33:55,731 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-22 01:33:55,731 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 01:33:55,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 01:33:55,731 INFO L82 PathProgramCache]: Analyzing trace with hash -809482178, now seen corresponding path program 48 times [2020-08-22 01:33:55,731 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 01:33:55,731 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823553020] [2020-08-22 01:33:55,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 01:33:55,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat