/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.3 -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 0.1.25-5644d1e-m [2020-08-19 05:19:15,052 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 05:19:15,055 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 05:19:15,095 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 05:19:15,096 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 05:19:15,104 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 05:19:15,106 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 05:19:15,110 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 05:19:15,112 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 05:19:15,115 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 05:19:15,116 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 05:19:15,117 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 05:19:15,117 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 05:19:15,119 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 05:19:15,122 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 05:19:15,123 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 05:19:15,125 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 05:19:15,126 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 05:19:15,127 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 05:19:15,138 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 05:19:15,140 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 05:19:15,141 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 05:19:15,142 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 05:19:15,142 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 05:19:15,154 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-19 05:19:15,155 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-19 05:19:15,155 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-19 05:19:15,161 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-19 05:19:15,161 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-19 05:19:15,162 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-19 05:19:15,172 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 05:19:15,173 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 05:19:15,174 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 05:19:15,176 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 05:19:15,213 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 05:19:15,214 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 05:19:15,216 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 05:19:15,216 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 05:19:15,216 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 05:19:15,216 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 05:19:15,217 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 05:19:15,217 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 05:19:15,217 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 05:19:15,217 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 05:19:15,218 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 05:19:15,219 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 05:19:15,219 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 05:19:15,219 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 05:19:15,219 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 05:19:15,220 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 05:19:15,220 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 05:19:15,220 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 05:19:15,220 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 05:19:15,220 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 05:19:15,221 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 05:19:15,221 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 05:19:15,221 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 05:19:15,221 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 05:19:15,221 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 05:19:15,222 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 05:19:15,222 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 05:19:15,222 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 05:19:15,222 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 05:19:15,222 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.3; [2020-08-19 05:19:15,501 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 05:19:15,514 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 05:19:15,517 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 05:19:15,519 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 05:19:15,519 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 05:19:15,520 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-19 05:19:15,594 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8aa6b1684/8e222de0fc34424097f664626d893888/FLAGc94149958 [2020-08-19 05:19:16,025 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 05:19:16,026 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-08-19 05:19:16,036 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8aa6b1684/8e222de0fc34424097f664626d893888/FLAGc94149958 [2020-08-19 05:19:16,399 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8aa6b1684/8e222de0fc34424097f664626d893888 [2020-08-19 05:19:16,410 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 05:19:16,412 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 05:19:16,413 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 05:19:16,413 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 05:19:16,416 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 05:19:16,417 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,420 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@786a7c9c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16, skipping insertion in model container [2020-08-19 05:19:16,421 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,428 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 05:19:16,443 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 05:19:16,608 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 05:19:16,611 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 05:19:16,626 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 05:19:16,637 INFO L208 MainTranslator]: Completed translation [2020-08-19 05:19:16,638 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16 WrapperNode [2020-08-19 05:19:16,638 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 05:19:16,638 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 05:19:16,638 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 05:19:16,639 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 05:19:16,648 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,648 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,740 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,741 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,745 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,751 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,752 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... [2020-08-19 05:19:16,754 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 05:19:16,754 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 05:19:16,754 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 05:19:16,754 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 05:19:16,755 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 05:19:16,821 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 05:19:16,821 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 05:19:16,822 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 05:19:16,824 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 05:19:16,824 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 05:19:16,824 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 05:19:16,824 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 05:19:16,824 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 05:19:16,825 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 05:19:16,994 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 05:19:16,994 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-19 05:19:16,998 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 05:19:16 BoogieIcfgContainer [2020-08-19 05:19:16,998 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 05:19:17,000 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 05:19:17,000 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 05:19:17,003 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 05:19:17,003 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 05:19:16" (1/3) ... [2020-08-19 05:19:17,005 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52f13da4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 05:19:17, skipping insertion in model container [2020-08-19 05:19:17,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 05:19:16" (2/3) ... [2020-08-19 05:19:17,005 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@52f13da4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 05:19:17, skipping insertion in model container [2020-08-19 05:19:17,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 05:19:16" (3/3) ... [2020-08-19 05:19:17,007 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-08-19 05:19:17,018 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 05:19:17,025 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 05:19:17,038 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 05:19:17,060 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 05:19:17,061 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 05:19:17,061 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 05:19:17,061 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 05:19:17,061 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 05:19:17,061 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 05:19:17,061 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 05:19:17,062 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 05:19:17,077 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-19 05:19:17,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 05:19:17,082 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:17,083 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:17,084 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:17,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:17,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-19 05:19:17,096 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:17,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [54793250] [2020-08-19 05:19:17,097 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:17,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:17,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,321 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:17,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [54793250] [2020-08-19 05:19:17,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 05:19:17,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 05:19:17,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67779419] [2020-08-19 05:19:17,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 05:19:17,333 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:17,350 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 05:19:17,352 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 05:19:17,354 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-19 05:19:17,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:17,398 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 05:19:17,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 05:19:17,401 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 05:19:17,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:17,408 INFO L225 Difference]: With dead ends: 29 [2020-08-19 05:19:17,408 INFO L226 Difference]: Without dead ends: 12 [2020-08-19 05:19:17,411 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 [2020-08-19 05:19:17,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-19 05:19:17,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-19 05:19:17,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-19 05:19:17,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-19 05:19:17,443 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-19 05:19:17,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:17,443 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-19 05:19:17,444 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 05:19:17,444 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-19 05:19:17,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-19 05:19:17,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:17,445 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:17,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 05:19:17,446 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:17,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:17,447 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-19 05:19:17,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:17,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [825502132] [2020-08-19 05:19:17,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:17,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:17,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:17,553 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [825502132] [2020-08-19 05:19:17,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:17,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 05:19:17,554 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054926786] [2020-08-19 05:19:17,555 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 05:19:17,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:17,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 05:19:17,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 05:19:17,557 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-19 05:19:17,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:17,575 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-19 05:19:17,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 05:19:17,576 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-19 05:19:17,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:17,577 INFO L225 Difference]: With dead ends: 18 [2020-08-19 05:19:17,577 INFO L226 Difference]: Without dead ends: 13 [2020-08-19 05:19:17,578 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 [2020-08-19 05:19:17,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-19 05:19:17,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-19 05:19:17,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-19 05:19:17,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-19 05:19:17,584 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-19 05:19:17,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:17,584 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-19 05:19:17,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 05:19:17,585 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-19 05:19:17,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-19 05:19:17,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:17,586 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:17,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 05:19:17,586 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:17,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:17,587 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-19 05:19:17,587 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:17,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [476866427] [2020-08-19 05:19:17,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:17,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:17,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,695 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:17,696 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [476866427] [2020-08-19 05:19:17,696 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:17,696 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 05:19:17,697 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601312310] [2020-08-19 05:19:17,697 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 05:19:17,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:17,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 05:19:17,698 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-19 05:19:17,698 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-19 05:19:17,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:17,720 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-19 05:19:17,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 05:19:17,721 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-19 05:19:17,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:17,722 INFO L225 Difference]: With dead ends: 19 [2020-08-19 05:19:17,722 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 05:19:17,723 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 [2020-08-19 05:19:17,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 05:19:17,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 05:19:17,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 05:19:17,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-19 05:19:17,728 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-19 05:19:17,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:17,729 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-19 05:19:17,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 05:19:17,729 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-19 05:19:17,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-19 05:19:17,730 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:17,730 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:17,730 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 05:19:17,731 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:17,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:17,731 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-19 05:19:17,732 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:17,732 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422498440] [2020-08-19 05:19:17,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:17,749 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:17,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:17,849 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:17,849 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422498440] [2020-08-19 05:19:17,850 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:17,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 05:19:17,850 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13657049] [2020-08-19 05:19:17,850 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 05:19:17,851 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:17,851 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 05:19:17,851 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-19 05:19:17,852 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-19 05:19:17,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:17,880 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-19 05:19:17,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 05:19:17,881 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-19 05:19:17,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:17,882 INFO L225 Difference]: With dead ends: 20 [2020-08-19 05:19:17,882 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 05:19:17,883 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 [2020-08-19 05:19:17,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 05:19:17,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 05:19:17,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 05:19:17,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-19 05:19:17,888 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-19 05:19:17,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:17,889 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-19 05:19:17,889 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 05:19:17,889 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-19 05:19:17,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 05:19:17,890 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:17,890 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:17,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 05:19:17,890 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:17,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:17,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-19 05:19:17,891 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:17,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1194498802] [2020-08-19 05:19:17,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:17,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:18,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,015 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:18,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1194498802] [2020-08-19 05:19:18,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:18,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 05:19:18,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [454632873] [2020-08-19 05:19:18,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 05:19:18,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:18,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 05:19:18,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-19 05:19:18,018 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-19 05:19:18,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:18,064 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-19 05:19:18,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 05:19:18,065 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-19 05:19:18,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:18,066 INFO L225 Difference]: With dead ends: 21 [2020-08-19 05:19:18,066 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 05:19:18,067 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 [2020-08-19 05:19:18,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 05:19:18,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 05:19:18,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 05:19:18,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-19 05:19:18,073 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-19 05:19:18,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:18,074 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-19 05:19:18,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 05:19:18,074 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-19 05:19:18,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 05:19:18,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:18,075 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:18,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 05:19:18,076 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:18,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:18,076 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-19 05:19:18,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:18,077 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1682929293] [2020-08-19 05:19:18,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:18,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:18,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,220 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:18,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1682929293] [2020-08-19 05:19:18,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:18,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 05:19:18,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046652329] [2020-08-19 05:19:18,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 05:19:18,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:18,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 05:19:18,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-19 05:19:18,223 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-19 05:19:18,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:18,335 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-19 05:19:18,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 05:19:18,336 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-19 05:19:18,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:18,336 INFO L225 Difference]: With dead ends: 22 [2020-08-19 05:19:18,337 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 05:19:18,339 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 [2020-08-19 05:19:18,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 05:19:18,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 05:19:18,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 05:19:18,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-19 05:19:18,348 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-19 05:19:18,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:18,349 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-19 05:19:18,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 05:19:18,349 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-19 05:19:18,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 05:19:18,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:18,350 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:18,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 05:19:18,350 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:18,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:18,356 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-19 05:19:18,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:18,357 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1990850178] [2020-08-19 05:19:18,357 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:18,376 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:18,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,482 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:18,482 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1990850178] [2020-08-19 05:19:18,482 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:18,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 05:19:18,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799185720] [2020-08-19 05:19:18,483 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 05:19:18,483 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:18,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 05:19:18,484 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 05:19:18,484 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-19 05:19:18,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:18,530 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-19 05:19:18,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 05:19:18,531 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-19 05:19:18,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:18,531 INFO L225 Difference]: With dead ends: 23 [2020-08-19 05:19:18,532 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 05:19:18,532 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 [2020-08-19 05:19:18,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 05:19:18,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 05:19:18,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 05:19:18,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-19 05:19:18,539 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-19 05:19:18,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:18,540 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-19 05:19:18,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 05:19:18,540 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-19 05:19:18,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 05:19:18,541 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:18,541 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:18,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 05:19:18,541 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:18,541 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:18,542 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-19 05:19:18,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:18,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430744348] [2020-08-19 05:19:18,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:18,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:18,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,707 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:18,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430744348] [2020-08-19 05:19:18,709 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:18,709 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 05:19:18,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1513701894] [2020-08-19 05:19:18,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 05:19:18,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:18,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 05:19:18,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 05:19:18,711 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-19 05:19:18,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:18,772 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-19 05:19:18,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 05:19:18,774 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-19 05:19:18,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:18,775 INFO L225 Difference]: With dead ends: 24 [2020-08-19 05:19:18,776 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 05:19:18,776 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-19 05:19:18,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 05:19:18,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 05:19:18,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 05:19:18,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-19 05:19:18,786 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-19 05:19:18,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:18,786 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-19 05:19:18,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 05:19:18,786 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-19 05:19:18,788 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 05:19:18,788 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:18,789 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:18,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 05:19:18,789 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:18,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:18,790 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-19 05:19:18,790 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:18,791 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1422436539] [2020-08-19 05:19:18,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:18,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:18,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:18,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:19,001 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:19,002 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1422436539] [2020-08-19 05:19:19,003 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:19,003 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 05:19:19,003 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885302873] [2020-08-19 05:19:19,004 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 05:19:19,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:19,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 05:19:19,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-19 05:19:19,006 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-19 05:19:19,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:19,091 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-19 05:19:19,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 05:19:19,091 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-19 05:19:19,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:19,092 INFO L225 Difference]: With dead ends: 25 [2020-08-19 05:19:19,092 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 05:19:19,093 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 [2020-08-19 05:19:19,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 05:19:19,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 05:19:19,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 05:19:19,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-19 05:19:19,098 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-19 05:19:19,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:19,106 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-19 05:19:19,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 05:19:19,107 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-19 05:19:19,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 05:19:19,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:19,108 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:19,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 05:19:19,108 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:19,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:19,108 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-19 05:19:19,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:19,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274341826] [2020-08-19 05:19:19,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:19,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:19,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:19,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:19,304 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:19,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274341826] [2020-08-19 05:19:19,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:19,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 05:19:19,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635096549] [2020-08-19 05:19:19,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 05:19:19,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:19,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 05:19:19,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-19 05:19:19,307 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-19 05:19:19,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:19,434 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-19 05:19:19,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 05:19:19,435 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-19 05:19:19,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:19,436 INFO L225 Difference]: With dead ends: 26 [2020-08-19 05:19:19,436 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 05:19:19,437 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 [2020-08-19 05:19:19,437 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 05:19:19,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 05:19:19,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 05:19:19,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-19 05:19:19,444 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-19 05:19:19,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:19,445 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-19 05:19:19,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 05:19:19,445 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-19 05:19:19,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 05:19:19,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:19,446 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:19,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 05:19:19,447 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:19,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:19,447 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-19 05:19:19,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:19,448 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281431286] [2020-08-19 05:19:19,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:19,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:19,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:19,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:19,672 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:19,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281431286] [2020-08-19 05:19:19,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:19,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 05:19:19,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2052732146] [2020-08-19 05:19:19,673 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 05:19:19,673 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:19,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 05:19:19,674 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-19 05:19:19,674 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-19 05:19:19,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:19,764 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-19 05:19:19,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 05:19:19,765 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-19 05:19:19,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:19,766 INFO L225 Difference]: With dead ends: 27 [2020-08-19 05:19:19,766 INFO L226 Difference]: Without dead ends: 22 [2020-08-19 05:19:19,766 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 [2020-08-19 05:19:19,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-19 05:19:19,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-19 05:19:19,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-19 05:19:19,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-19 05:19:19,771 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-19 05:19:19,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:19,771 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-19 05:19:19,772 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 05:19:19,772 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-19 05:19:19,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-19 05:19:19,772 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:19,772 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:19,773 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 05:19:19,773 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:19,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:19,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-19 05:19:19,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:19,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1790245220] [2020-08-19 05:19:19,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:19,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:19,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:19,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:19,966 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:19,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1790245220] [2020-08-19 05:19:19,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:19,968 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 05:19:19,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529618630] [2020-08-19 05:19:19,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 05:19:19,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:19,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 05:19:19,969 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-19 05:19:19,969 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-19 05:19:20,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:20,076 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-19 05:19:20,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 05:19:20,077 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-19 05:19:20,078 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:20,078 INFO L225 Difference]: With dead ends: 28 [2020-08-19 05:19:20,078 INFO L226 Difference]: Without dead ends: 23 [2020-08-19 05:19:20,079 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 [2020-08-19 05:19:20,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-19 05:19:20,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-19 05:19:20,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-19 05:19:20,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-19 05:19:20,086 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-19 05:19:20,087 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:20,087 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-19 05:19:20,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 05:19:20,087 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-19 05:19:20,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 05:19:20,091 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:20,092 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:20,092 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 05:19:20,092 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:20,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:20,092 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-19 05:19:20,093 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:20,093 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698314019] [2020-08-19 05:19:20,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:20,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:20,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:20,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:20,327 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:20,327 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698314019] [2020-08-19 05:19:20,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:20,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 05:19:20,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [240641256] [2020-08-19 05:19:20,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 05:19:20,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:20,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 05:19:20,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-19 05:19:20,329 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-19 05:19:20,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:20,448 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-19 05:19:20,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 05:19:20,452 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-19 05:19:20,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:20,453 INFO L225 Difference]: With dead ends: 29 [2020-08-19 05:19:20,453 INFO L226 Difference]: Without dead ends: 24 [2020-08-19 05:19:20,453 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 [2020-08-19 05:19:20,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-19 05:19:20,461 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-19 05:19:20,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-19 05:19:20,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-19 05:19:20,462 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-19 05:19:20,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:20,462 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-19 05:19:20,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 05:19:20,463 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-19 05:19:20,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-19 05:19:20,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:20,465 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:20,465 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 05:19:20,465 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:20,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:20,465 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-19 05:19:20,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:20,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686558401] [2020-08-19 05:19:20,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:20,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:20,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:20,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:20,715 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:20,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686558401] [2020-08-19 05:19:20,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:20,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 05:19:20,717 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730360109] [2020-08-19 05:19:20,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 05:19:20,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:20,718 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 05:19:20,718 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-19 05:19:20,719 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-19 05:19:20,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:20,861 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-19 05:19:20,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 05:19:20,863 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-19 05:19:20,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:20,863 INFO L225 Difference]: With dead ends: 30 [2020-08-19 05:19:20,864 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 05:19:20,864 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 [2020-08-19 05:19:20,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 05:19:20,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 05:19:20,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 05:19:20,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-19 05:19:20,876 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-19 05:19:20,876 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:20,876 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-19 05:19:20,876 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 05:19:20,876 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-19 05:19:20,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 05:19:20,877 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:20,877 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:20,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 05:19:20,878 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:20,878 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:20,878 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-19 05:19:20,879 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:20,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1939716180] [2020-08-19 05:19:20,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:20,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:21,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,158 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:21,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1939716180] [2020-08-19 05:19:21,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:21,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 05:19:21,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160109632] [2020-08-19 05:19:21,159 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 05:19:21,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:21,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 05:19:21,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-19 05:19:21,160 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-19 05:19:21,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:21,317 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-19 05:19:21,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 05:19:21,318 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-19 05:19:21,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:21,318 INFO L225 Difference]: With dead ends: 31 [2020-08-19 05:19:21,319 INFO L226 Difference]: Without dead ends: 26 [2020-08-19 05:19:21,321 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 [2020-08-19 05:19:21,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-19 05:19:21,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-19 05:19:21,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-19 05:19:21,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-19 05:19:21,331 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-19 05:19:21,332 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:21,332 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-19 05:19:21,332 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 05:19:21,332 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-19 05:19:21,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-19 05:19:21,333 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:21,333 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:21,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 05:19:21,335 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:21,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:21,336 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-19 05:19:21,336 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:21,336 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650820554] [2020-08-19 05:19:21,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:21,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:21,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:21,667 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:21,667 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650820554] [2020-08-19 05:19:21,668 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:21,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 05:19:21,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807746497] [2020-08-19 05:19:21,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 05:19:21,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:21,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 05:19:21,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-19 05:19:21,671 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-19 05:19:21,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:21,860 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-19 05:19:21,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 05:19:21,860 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-19 05:19:21,861 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:21,861 INFO L225 Difference]: With dead ends: 32 [2020-08-19 05:19:21,862 INFO L226 Difference]: Without dead ends: 27 [2020-08-19 05:19:21,862 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 [2020-08-19 05:19:21,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-19 05:19:21,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-19 05:19:21,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-19 05:19:21,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-19 05:19:21,869 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-19 05:19:21,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:21,869 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-19 05:19:21,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 05:19:21,870 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-19 05:19:21,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 05:19:21,872 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:21,872 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:21,872 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 05:19:21,873 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:21,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:21,873 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-19 05:19:21,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:21,873 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1113386982] [2020-08-19 05:19:21,874 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:21,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:22,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,221 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:22,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1113386982] [2020-08-19 05:19:22,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:22,222 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 05:19:22,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188166067] [2020-08-19 05:19:22,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 05:19:22,223 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:22,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 05:19:22,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-19 05:19:22,223 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-19 05:19:22,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:22,451 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-19 05:19:22,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 05:19:22,454 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-19 05:19:22,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:22,454 INFO L225 Difference]: With dead ends: 33 [2020-08-19 05:19:22,454 INFO L226 Difference]: Without dead ends: 28 [2020-08-19 05:19:22,455 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 [2020-08-19 05:19:22,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-19 05:19:22,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-19 05:19:22,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 05:19:22,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-19 05:19:22,459 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-19 05:19:22,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:22,459 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-19 05:19:22,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 05:19:22,460 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-19 05:19:22,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-19 05:19:22,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:22,461 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:22,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 05:19:22,461 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:22,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:22,461 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-19 05:19:22,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:22,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513724168] [2020-08-19 05:19:22,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:22,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:22,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:22,773 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:22,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513724168] [2020-08-19 05:19:22,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:22,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 05:19:22,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2060807943] [2020-08-19 05:19:22,774 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 05:19:22,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:22,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 05:19:22,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-19 05:19:22,775 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-19 05:19:22,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:22,986 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-19 05:19:22,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 05:19:22,986 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-19 05:19:22,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:22,987 INFO L225 Difference]: With dead ends: 34 [2020-08-19 05:19:22,987 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 05:19:22,988 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 [2020-08-19 05:19:22,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 05:19:22,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 05:19:22,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 05:19:22,992 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-19 05:19:22,993 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-19 05:19:22,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:22,993 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-19 05:19:22,993 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 05:19:22,993 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-19 05:19:22,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 05:19:22,994 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:22,994 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:22,994 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 05:19:22,994 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:22,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:22,995 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-19 05:19:22,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:22,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649930976] [2020-08-19 05:19:22,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:23,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,350 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:23,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:23,354 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:23,355 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649930976] [2020-08-19 05:19:23,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:23,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 05:19:23,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [486653131] [2020-08-19 05:19:23,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 05:19:23,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:23,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 05:19:23,357 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 05:19:23,357 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-19 05:19:23,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:23,638 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-19 05:19:23,638 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 05:19:23,638 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-19 05:19:23,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:23,639 INFO L225 Difference]: With dead ends: 35 [2020-08-19 05:19:23,639 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 05:19:23,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-19 05:19:23,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 05:19:23,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-19 05:19:23,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-19 05:19:23,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-19 05:19:23,646 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-19 05:19:23,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:23,646 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-19 05:19:23,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 05:19:23,647 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-19 05:19:23,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-19 05:19:23,647 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:23,647 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:23,648 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 05:19:23,648 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:23,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:23,648 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-19 05:19:23,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:23,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2000786505] [2020-08-19 05:19:23,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:23,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:24,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,031 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:24,032 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2000786505] [2020-08-19 05:19:24,032 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:24,032 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 05:19:24,032 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485621043] [2020-08-19 05:19:24,032 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 05:19:24,033 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:24,033 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 05:19:24,033 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-19 05:19:24,033 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-19 05:19:24,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:24,293 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-19 05:19:24,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 05:19:24,293 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-19 05:19:24,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:24,294 INFO L225 Difference]: With dead ends: 36 [2020-08-19 05:19:24,294 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 05:19:24,295 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 [2020-08-19 05:19:24,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 05:19:24,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-19 05:19:24,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 05:19:24,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-19 05:19:24,299 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-19 05:19:24,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:24,300 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-19 05:19:24,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 05:19:24,300 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-19 05:19:24,300 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 05:19:24,301 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:24,301 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:24,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 05:19:24,301 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:24,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:24,302 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-19 05:19:24,302 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:24,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838399438] [2020-08-19 05:19:24,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:24,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:24,710 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:24,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838399438] [2020-08-19 05:19:24,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:24,711 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 05:19:24,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957300545] [2020-08-19 05:19:24,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 05:19:24,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:24,714 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 05:19:24,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-19 05:19:24,715 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-19 05:19:24,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:24,997 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-19 05:19:24,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 05:19:24,997 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-19 05:19:24,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:24,998 INFO L225 Difference]: With dead ends: 37 [2020-08-19 05:19:24,998 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 05:19:24,999 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 [2020-08-19 05:19:24,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 05:19:25,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-19 05:19:25,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-19 05:19:25,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-19 05:19:25,003 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-19 05:19:25,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:25,004 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-19 05:19:25,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 05:19:25,004 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-19 05:19:25,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-19 05:19:25,005 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:25,005 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:25,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 05:19:25,005 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:25,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:25,006 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-19 05:19:25,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:25,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974638663] [2020-08-19 05:19:25,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:25,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:25,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:25,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:25,411 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:25,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974638663] [2020-08-19 05:19:25,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:25,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 05:19:25,413 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331132188] [2020-08-19 05:19:25,414 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 05:19:25,414 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:25,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 05:19:25,415 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 05:19:25,415 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-19 05:19:25,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:25,745 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-19 05:19:25,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 05:19:25,747 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-19 05:19:25,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:25,748 INFO L225 Difference]: With dead ends: 38 [2020-08-19 05:19:25,748 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 05:19:25,749 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-19 05:19:25,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 05:19:25,755 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 05:19:25,755 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 05:19:25,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-19 05:19:25,756 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-19 05:19:25,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:25,756 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-19 05:19:25,756 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 05:19:25,756 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-19 05:19:25,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 05:19:25,757 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:25,757 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:25,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 05:19:25,757 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:25,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:25,758 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-19 05:19:25,758 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:25,758 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547554326] [2020-08-19 05:19:25,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:25,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:26,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:26,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:26,229 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:26,230 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547554326] [2020-08-19 05:19:26,230 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:26,230 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 05:19:26,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1854461142] [2020-08-19 05:19:26,231 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 05:19:26,231 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:26,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 05:19:26,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-19 05:19:26,232 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-19 05:19:26,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:26,578 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-19 05:19:26,578 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 05:19:26,578 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-19 05:19:26,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:26,579 INFO L225 Difference]: With dead ends: 39 [2020-08-19 05:19:26,579 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 05:19:26,580 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 [2020-08-19 05:19:26,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 05:19:26,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 05:19:26,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 05:19:26,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-19 05:19:26,588 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-19 05:19:26,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:26,588 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-19 05:19:26,588 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 05:19:26,589 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-19 05:19:26,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 05:19:26,589 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:26,589 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:26,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 05:19:26,589 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:26,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:26,590 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-19 05:19:26,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:26,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [596181770] [2020-08-19 05:19:26,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:26,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:27,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:27,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:27,105 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:27,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [596181770] [2020-08-19 05:19:27,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:27,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 05:19:27,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136016133] [2020-08-19 05:19:27,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 05:19:27,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:27,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 05:19:27,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 05:19:27,107 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-19 05:19:27,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:27,492 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-19 05:19:27,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 05:19:27,493 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-19 05:19:27,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:27,493 INFO L225 Difference]: With dead ends: 40 [2020-08-19 05:19:27,494 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 05:19:27,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-19 05:19:27,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 05:19:27,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 05:19:27,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 05:19:27,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-19 05:19:27,499 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-19 05:19:27,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:27,499 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-19 05:19:27,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 05:19:27,499 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-19 05:19:27,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 05:19:27,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:27,500 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:27,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 05:19:27,501 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:27,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:27,501 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-19 05:19:27,501 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:27,501 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1786693527] [2020-08-19 05:19:27,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:27,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:28,061 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:28,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:28,065 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:28,065 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1786693527] [2020-08-19 05:19:28,065 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:28,065 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 05:19:28,065 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117295834] [2020-08-19 05:19:28,066 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 05:19:28,066 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:28,066 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 05:19:28,066 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-19 05:19:28,066 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-19 05:19:28,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:28,484 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-19 05:19:28,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 05:19:28,485 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-19 05:19:28,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:28,486 INFO L225 Difference]: With dead ends: 41 [2020-08-19 05:19:28,486 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 05:19:28,487 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 [2020-08-19 05:19:28,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 05:19:28,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 05:19:28,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 05:19:28,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-19 05:19:28,497 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-19 05:19:28,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:28,498 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-19 05:19:28,498 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 05:19:28,498 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-19 05:19:28,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 05:19:28,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:28,499 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:28,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 05:19:28,499 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:28,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:28,499 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-19 05:19:28,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:28,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929323056] [2020-08-19 05:19:28,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:28,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:29,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:29,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:29,055 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:29,055 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929323056] [2020-08-19 05:19:29,055 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:29,055 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 05:19:29,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006115012] [2020-08-19 05:19:29,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 05:19:29,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:29,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 05:19:29,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 05:19:29,059 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-19 05:19:29,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:29,506 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-19 05:19:29,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 05:19:29,506 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-19 05:19:29,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:29,507 INFO L225 Difference]: With dead ends: 42 [2020-08-19 05:19:29,507 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 05:19:29,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-19 05:19:29,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 05:19:29,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 05:19:29,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 05:19:29,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-19 05:19:29,522 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-19 05:19:29,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:29,522 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-19 05:19:29,522 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 05:19:29,522 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-19 05:19:29,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 05:19:29,523 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:29,523 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:29,524 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 05:19:29,524 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:29,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:29,524 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-19 05:19:29,525 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:29,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853328195] [2020-08-19 05:19:29,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:29,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:30,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:30,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:30,198 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:30,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853328195] [2020-08-19 05:19:30,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:30,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 05:19:30,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1872080965] [2020-08-19 05:19:30,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 05:19:30,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:30,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 05:19:30,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-19 05:19:30,201 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-19 05:19:30,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:30,629 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-19 05:19:30,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 05:19:30,630 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-19 05:19:30,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:30,631 INFO L225 Difference]: With dead ends: 43 [2020-08-19 05:19:30,631 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 05:19:30,631 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 [2020-08-19 05:19:30,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 05:19:30,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 05:19:30,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 05:19:30,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-19 05:19:30,636 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-19 05:19:30,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:30,637 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-19 05:19:30,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 05:19:30,637 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-19 05:19:30,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 05:19:30,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:30,637 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:30,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 05:19:30,638 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:30,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:30,638 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-19 05:19:30,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:30,639 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1806729751] [2020-08-19 05:19:30,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:30,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:31,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:31,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:31,248 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:31,248 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1806729751] [2020-08-19 05:19:31,248 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:31,248 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 05:19:31,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496303227] [2020-08-19 05:19:31,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 05:19:31,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:31,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 05:19:31,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 05:19:31,249 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-19 05:19:31,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:31,754 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-19 05:19:31,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 05:19:31,754 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-19 05:19:31,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:31,755 INFO L225 Difference]: With dead ends: 44 [2020-08-19 05:19:31,755 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 05:19:31,755 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-19 05:19:31,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 05:19:31,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 05:19:31,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 05:19:31,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-19 05:19:31,759 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-19 05:19:31,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:31,759 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-19 05:19:31,760 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 05:19:31,760 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-19 05:19:31,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 05:19:31,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:31,760 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:31,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 05:19:31,760 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:31,761 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:31,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-19 05:19:31,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:31,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1076884451] [2020-08-19 05:19:31,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:31,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:32,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:32,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:32,527 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:32,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1076884451] [2020-08-19 05:19:32,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:32,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 05:19:32,528 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861338242] [2020-08-19 05:19:32,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 05:19:32,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:32,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 05:19:32,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-19 05:19:32,529 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-19 05:19:33,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:33,056 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-19 05:19:33,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 05:19:33,056 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-19 05:19:33,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:33,057 INFO L225 Difference]: With dead ends: 45 [2020-08-19 05:19:33,057 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 05:19:33,058 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 [2020-08-19 05:19:33,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 05:19:33,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 05:19:33,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 05:19:33,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-19 05:19:33,062 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-19 05:19:33,062 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:33,062 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-19 05:19:33,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 05:19:33,062 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-19 05:19:33,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 05:19:33,063 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:33,063 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:33,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 05:19:33,063 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:33,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:33,063 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-19 05:19:33,063 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:33,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2003660409] [2020-08-19 05:19:33,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:33,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:33,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:33,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:33,825 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:33,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2003660409] [2020-08-19 05:19:33,826 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:33,826 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 05:19:33,826 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1699773554] [2020-08-19 05:19:33,826 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 05:19:33,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:33,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 05:19:33,827 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 05:19:33,827 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-19 05:19:34,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:34,424 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-19 05:19:34,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 05:19:34,424 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-19 05:19:34,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:34,425 INFO L225 Difference]: With dead ends: 46 [2020-08-19 05:19:34,425 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 05:19:34,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-19 05:19:34,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 05:19:34,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 05:19:34,429 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 05:19:34,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-19 05:19:34,430 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-19 05:19:34,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:34,430 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-19 05:19:34,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 05:19:34,431 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-19 05:19:34,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 05:19:34,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:34,431 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:34,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 05:19:34,432 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:34,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:34,432 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-19 05:19:34,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:34,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079474063] [2020-08-19 05:19:34,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:34,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:35,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:35,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:35,226 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:35,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079474063] [2020-08-19 05:19:35,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:35,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 05:19:35,227 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966469656] [2020-08-19 05:19:35,227 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 05:19:35,227 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:35,228 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 05:19:35,228 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 05:19:35,228 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-19 05:19:35,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:35,879 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-19 05:19:35,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 05:19:35,881 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-19 05:19:35,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:35,882 INFO L225 Difference]: With dead ends: 47 [2020-08-19 05:19:35,882 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 05:19:35,883 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 [2020-08-19 05:19:35,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 05:19:35,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 05:19:35,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 05:19:35,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-19 05:19:35,886 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-19 05:19:35,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:35,887 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-19 05:19:35,887 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 05:19:35,887 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-19 05:19:35,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 05:19:35,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:35,888 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:35,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 05:19:35,888 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:35,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:35,888 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-19 05:19:35,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:35,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [598383550] [2020-08-19 05:19:35,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:35,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:36,711 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:36,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:36,715 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:36,716 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [598383550] [2020-08-19 05:19:36,716 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:36,716 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 05:19:36,716 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806360890] [2020-08-19 05:19:36,716 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 05:19:36,717 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:36,717 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 05:19:36,717 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 05:19:36,717 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-19 05:19:37,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:37,403 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-19 05:19:37,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 05:19:37,404 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-19 05:19:37,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:37,405 INFO L225 Difference]: With dead ends: 48 [2020-08-19 05:19:37,405 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 05:19:37,406 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 [2020-08-19 05:19:37,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 05:19:37,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 05:19:37,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 05:19:37,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-19 05:19:37,410 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-19 05:19:37,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:37,411 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-19 05:19:37,411 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 05:19:37,411 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-19 05:19:37,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 05:19:37,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:37,412 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:37,412 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 05:19:37,412 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:37,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:37,412 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-19 05:19:37,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:37,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568054574] [2020-08-19 05:19:37,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:37,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:38,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:38,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:38,292 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:38,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568054574] [2020-08-19 05:19:38,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:38,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 05:19:38,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076215862] [2020-08-19 05:19:38,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 05:19:38,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:38,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 05:19:38,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 05:19:38,293 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-19 05:19:39,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:39,037 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-19 05:19:39,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 05:19:39,037 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-19 05:19:39,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:39,038 INFO L225 Difference]: With dead ends: 49 [2020-08-19 05:19:39,039 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 05:19:39,040 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 [2020-08-19 05:19:39,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 05:19:39,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 05:19:39,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 05:19:39,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-19 05:19:39,043 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-19 05:19:39,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:39,044 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-19 05:19:39,044 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 05:19:39,044 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-19 05:19:39,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 05:19:39,044 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:39,044 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:39,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 05:19:39,045 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:39,045 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:39,045 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-19 05:19:39,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:39,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125011382] [2020-08-19 05:19:39,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:39,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:39,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:39,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:39,989 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:39,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125011382] [2020-08-19 05:19:39,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:39,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 05:19:39,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516276132] [2020-08-19 05:19:39,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 05:19:39,991 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:39,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 05:19:39,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 05:19:39,991 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-19 05:19:40,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:40,752 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-19 05:19:40,753 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 05:19:40,753 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-19 05:19:40,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:40,754 INFO L225 Difference]: With dead ends: 50 [2020-08-19 05:19:40,754 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 05:19:40,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 05:19:40,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 05:19:40,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 05:19:40,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 05:19:40,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-19 05:19:40,758 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-19 05:19:40,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:40,758 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-19 05:19:40,758 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 05:19:40,758 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-19 05:19:40,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 05:19:40,759 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:40,759 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:40,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 05:19:40,759 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:40,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:40,759 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-19 05:19:40,760 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:40,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582942740] [2020-08-19 05:19:40,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:40,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:41,729 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:41,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:41,735 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:41,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582942740] [2020-08-19 05:19:41,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:41,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 05:19:41,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [460046624] [2020-08-19 05:19:41,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 05:19:41,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:41,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 05:19:41,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 05:19:41,737 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-19 05:19:42,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:42,563 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-19 05:19:42,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 05:19:42,563 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-19 05:19:42,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:42,564 INFO L225 Difference]: With dead ends: 51 [2020-08-19 05:19:42,564 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 05:19:42,566 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 [2020-08-19 05:19:42,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 05:19:42,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 05:19:42,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 05:19:42,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-19 05:19:42,570 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-19 05:19:42,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:42,570 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-19 05:19:42,570 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 05:19:42,570 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-19 05:19:42,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 05:19:42,571 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:42,571 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:42,571 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 05:19:42,571 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:42,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:42,572 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-19 05:19:42,572 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:42,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [444454986] [2020-08-19 05:19:42,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:42,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:43,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:43,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:43,573 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:43,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [444454986] [2020-08-19 05:19:43,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:43,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 05:19:43,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036469737] [2020-08-19 05:19:43,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 05:19:43,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:43,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 05:19:43,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 05:19:43,575 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-19 05:19:44,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:44,431 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-19 05:19:44,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 05:19:44,432 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-19 05:19:44,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:44,433 INFO L225 Difference]: With dead ends: 52 [2020-08-19 05:19:44,433 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 05:19:44,433 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 [2020-08-19 05:19:44,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 05:19:44,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 05:19:44,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 05:19:44,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-19 05:19:44,436 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-19 05:19:44,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:44,437 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-19 05:19:44,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 05:19:44,437 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-19 05:19:44,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 05:19:44,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:44,438 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:44,438 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 05:19:44,438 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:44,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:44,438 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-19 05:19:44,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:44,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1274450168] [2020-08-19 05:19:44,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:44,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:45,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:45,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:45,446 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:45,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1274450168] [2020-08-19 05:19:45,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:45,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 05:19:45,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407350422] [2020-08-19 05:19:45,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 05:19:45,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:45,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 05:19:45,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 05:19:45,448 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-19 05:19:46,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:46,376 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-19 05:19:46,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 05:19:46,378 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-19 05:19:46,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:46,379 INFO L225 Difference]: With dead ends: 53 [2020-08-19 05:19:46,379 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 05:19:46,380 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 [2020-08-19 05:19:46,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 05:19:46,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 05:19:46,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 05:19:46,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-19 05:19:46,383 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-19 05:19:46,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:46,384 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-19 05:19:46,384 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 05:19:46,384 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-19 05:19:46,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 05:19:46,385 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:46,385 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:46,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 05:19:46,385 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:46,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:46,385 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-19 05:19:46,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:46,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [156123908] [2020-08-19 05:19:46,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:46,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:47,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:47,524 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:47,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [156123908] [2020-08-19 05:19:47,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:47,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 05:19:47,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137547104] [2020-08-19 05:19:47,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 05:19:47,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:47,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 05:19:47,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 05:19:47,527 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-19 05:19:48,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:48,481 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-19 05:19:48,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 05:19:48,482 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-19 05:19:48,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:48,483 INFO L225 Difference]: With dead ends: 54 [2020-08-19 05:19:48,483 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 05:19:48,484 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 05:19:48,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 05:19:48,487 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 05:19:48,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 05:19:48,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-19 05:19:48,488 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-19 05:19:48,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:48,488 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-19 05:19:48,488 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 05:19:48,488 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-19 05:19:48,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 05:19:48,489 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:48,489 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:48,489 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 05:19:48,489 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:48,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:48,490 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-19 05:19:48,490 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:48,490 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1942529438] [2020-08-19 05:19:48,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:48,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:49,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:49,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:49,638 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:49,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1942529438] [2020-08-19 05:19:49,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:49,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 05:19:49,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1874721023] [2020-08-19 05:19:49,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 05:19:49,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:49,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 05:19:49,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 05:19:49,640 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-19 05:19:50,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:50,621 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-19 05:19:50,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 05:19:50,621 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-19 05:19:50,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:50,623 INFO L225 Difference]: With dead ends: 55 [2020-08-19 05:19:50,623 INFO L226 Difference]: Without dead ends: 50 [2020-08-19 05:19:50,625 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 [2020-08-19 05:19:50,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-19 05:19:50,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-19 05:19:50,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-19 05:19:50,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-19 05:19:50,629 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-19 05:19:50,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:50,629 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-19 05:19:50,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 05:19:50,629 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-19 05:19:50,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-19 05:19:50,630 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:50,630 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:50,630 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 05:19:50,630 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:50,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:50,631 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-19 05:19:50,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:50,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [364770647] [2020-08-19 05:19:50,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:50,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:51,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:51,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:51,905 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:51,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [364770647] [2020-08-19 05:19:51,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:51,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 05:19:51,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528704425] [2020-08-19 05:19:51,906 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 05:19:51,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:51,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 05:19:51,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 05:19:51,908 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-19 05:19:52,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:52,992 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-19 05:19:52,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 05:19:52,993 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-19 05:19:52,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:52,994 INFO L225 Difference]: With dead ends: 56 [2020-08-19 05:19:52,994 INFO L226 Difference]: Without dead ends: 51 [2020-08-19 05:19:52,995 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 05:19:52,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-19 05:19:52,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-19 05:19:52,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 05:19:53,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-19 05:19:53,000 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-19 05:19:53,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:53,000 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-19 05:19:53,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 05:19:53,001 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-19 05:19:53,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 05:19:53,001 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:53,001 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:53,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 05:19:53,001 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:53,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:53,002 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-19 05:19:53,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:53,002 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1039504783] [2020-08-19 05:19:53,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:53,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:54,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:54,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:54,302 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:54,303 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1039504783] [2020-08-19 05:19:54,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:54,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 05:19:54,303 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309897728] [2020-08-19 05:19:54,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 05:19:54,303 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:54,304 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 05:19:54,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 05:19:54,304 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-19 05:19:55,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:55,431 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-19 05:19:55,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 05:19:55,432 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-19 05:19:55,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:55,433 INFO L225 Difference]: With dead ends: 57 [2020-08-19 05:19:55,433 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 05:19:55,434 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 05:19:55,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 05:19:55,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-19 05:19:55,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-19 05:19:55,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-19 05:19:55,438 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-19 05:19:55,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:55,439 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-19 05:19:55,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 05:19:55,439 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-19 05:19:55,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-19 05:19:55,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:55,439 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:55,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 05:19:55,440 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:55,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:55,440 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-19 05:19:55,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:55,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2080291887] [2020-08-19 05:19:55,441 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:55,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:56,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:56,963 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:56,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2080291887] [2020-08-19 05:19:56,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:56,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-19 05:19:56,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827362844] [2020-08-19 05:19:56,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-19 05:19:56,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:56,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-19 05:19:56,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 05:19:56,965 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-19 05:19:58,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:19:58,153 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-19 05:19:58,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-19 05:19:58,154 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-19 05:19:58,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:19:58,155 INFO L225 Difference]: With dead ends: 58 [2020-08-19 05:19:58,155 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 05:19:58,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 05:19:58,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 05:19:58,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-19 05:19:58,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 05:19:58,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-19 05:19:58,160 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-19 05:19:58,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:19:58,160 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-19 05:19:58,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-19 05:19:58,160 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-19 05:19:58,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 05:19:58,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:19:58,161 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:19:58,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 05:19:58,161 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:19:58,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:19:58,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-19 05:19:58,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:19:58,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1092783574] [2020-08-19 05:19:58,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:19:58,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:59,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:19:59,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:19:59,558 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:19:59,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1092783574] [2020-08-19 05:19:59,558 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:19:59,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-19 05:19:59,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [568844932] [2020-08-19 05:19:59,559 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-19 05:19:59,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:19:59,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-19 05:19:59,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 05:19:59,560 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-19 05:20:00,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:00,827 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-19 05:20:00,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-19 05:20:00,829 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-19 05:20:00,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:00,830 INFO L225 Difference]: With dead ends: 59 [2020-08-19 05:20:00,830 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 05:20:00,831 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 05:20:00,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 05:20:00,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-19 05:20:00,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-19 05:20:00,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-19 05:20:00,835 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-19 05:20:00,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:00,835 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-19 05:20:00,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-19 05:20:00,835 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-19 05:20:00,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-19 05:20:00,836 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:00,836 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:00,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-19 05:20:00,836 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:00,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:00,837 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-19 05:20:00,837 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:00,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1723920410] [2020-08-19 05:20:00,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:00,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:02,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:02,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:02,310 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:02,310 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1723920410] [2020-08-19 05:20:02,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:02,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-19 05:20:02,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [125747158] [2020-08-19 05:20:02,311 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-19 05:20:02,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:02,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-19 05:20:02,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 05:20:02,313 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-19 05:20:03,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:03,625 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-19 05:20:03,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-19 05:20:03,626 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-19 05:20:03,626 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:03,627 INFO L225 Difference]: With dead ends: 60 [2020-08-19 05:20:03,627 INFO L226 Difference]: Without dead ends: 55 [2020-08-19 05:20:03,627 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 05:20:03,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-19 05:20:03,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-19 05:20:03,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 05:20:03,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-19 05:20:03,630 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-19 05:20:03,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:03,631 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-19 05:20:03,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-19 05:20:03,631 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-19 05:20:03,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 05:20:03,631 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:03,631 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:03,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-19 05:20:03,632 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:03,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:03,632 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-19 05:20:03,632 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:03,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1678232309] [2020-08-19 05:20:03,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:03,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:05,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:05,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:05,195 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:05,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1678232309] [2020-08-19 05:20:05,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:05,196 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-19 05:20:05,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294025368] [2020-08-19 05:20:05,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-19 05:20:05,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:05,196 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-19 05:20:05,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 05:20:05,197 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-19 05:20:06,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:06,565 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-19 05:20:06,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-19 05:20:06,566 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-19 05:20:06,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:06,567 INFO L225 Difference]: With dead ends: 61 [2020-08-19 05:20:06,567 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 05:20:06,568 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 05:20:06,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 05:20:06,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-19 05:20:06,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-19 05:20:06,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-19 05:20:06,573 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-19 05:20:06,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:06,573 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-19 05:20:06,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-19 05:20:06,573 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-19 05:20:06,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-19 05:20:06,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:06,574 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:06,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-19 05:20:06,574 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:06,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:06,575 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-19 05:20:06,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:06,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1058387585] [2020-08-19 05:20:06,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:06,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:08,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:08,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:08,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:08,198 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1058387585] [2020-08-19 05:20:08,198 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:08,198 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-19 05:20:08,198 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646571718] [2020-08-19 05:20:08,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-19 05:20:08,199 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:08,199 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-19 05:20:08,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-19 05:20:08,199 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-19 05:20:09,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:09,596 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-19 05:20:09,596 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-19 05:20:09,597 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-19 05:20:09,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:09,598 INFO L225 Difference]: With dead ends: 62 [2020-08-19 05:20:09,598 INFO L226 Difference]: Without dead ends: 57 [2020-08-19 05:20:09,598 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 [2020-08-19 05:20:09,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-19 05:20:09,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-19 05:20:09,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 05:20:09,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-19 05:20:09,602 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-19 05:20:09,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:09,602 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-19 05:20:09,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-19 05:20:09,602 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-19 05:20:09,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 05:20:09,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:09,603 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:09,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-19 05:20:09,603 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:09,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:09,603 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-19 05:20:09,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:09,606 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1547763841] [2020-08-19 05:20:09,606 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:09,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:11,232 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:11,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:11,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:11,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1547763841] [2020-08-19 05:20:11,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:11,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-19 05:20:11,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732488130] [2020-08-19 05:20:11,240 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-19 05:20:11,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:11,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-19 05:20:11,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 05:20:11,241 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-19 05:20:12,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 05:20:12,728 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-19 05:20:12,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-19 05:20:12,729 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-19 05:20:12,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 05:20:12,729 INFO L225 Difference]: With dead ends: 63 [2020-08-19 05:20:12,729 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 05:20:12,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-19 05:20:12,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 05:20:12,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-19 05:20:12,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-19 05:20:12,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-19 05:20:12,734 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-19 05:20:12,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 05:20:12,734 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-19 05:20:12,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-19 05:20:12,734 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-19 05:20:12,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-19 05:20:12,735 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 05:20:12,735 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 05:20:12,735 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-19 05:20:12,735 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 05:20:12,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 05:20:12,736 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-19 05:20:12,736 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 05:20:12,736 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2046174699] [2020-08-19 05:20:12,738 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 05:20:12,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:14,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 05:20:14,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 05:20:14,550 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 05:20:14,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2046174699] [2020-08-19 05:20:14,551 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 05:20:14,551 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-19 05:20:14,551 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815900637] [2020-08-19 05:20:14,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-19 05:20:14,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 05:20:14,552 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-19 05:20:14,552 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-19 05:20:14,553 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.