/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:29:52,130 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 21:29:52,133 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 21:29:52,157 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 21:29:52,158 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:29:52,159 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:29:52,161 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:29:52,162 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:29:52,164 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:29:52,165 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:29:52,166 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:29:52,167 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:29:52,168 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:29:52,169 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:29:52,170 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:29:52,171 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:29:52,171 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:29:52,172 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:29:52,174 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:29:52,176 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:29:52,178 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:29:52,179 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:29:52,180 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:29:52,181 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:29:52,183 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:29:52,191 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:29:52,192 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:29:52,193 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:29:52,194 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 21:29:52,246 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:29:52,246 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:29:52,250 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:29:52,251 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:29:52,251 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:29:52,251 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:29:52,251 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:29:52,252 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:29:52,252 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:29:52,252 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:29:52,252 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:29:52,252 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:29:52,253 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:29:52,253 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:29:52,253 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:29:52,253 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:29:52,253 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:29:52,254 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:29:52,254 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:29:52,254 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:29:52,254 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:29:52,254 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:29:52,254 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:29:52,257 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:29:52,257 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:29:52,257 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:29:52,257 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:29:52,258 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:29:52,258 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:29:52,258 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:29:52,549 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:29:52,561 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:29:52,564 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:29:52,566 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:29:52,566 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:29:52,567 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 21:29:52,627 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4e44312c9/88be6162db6c4748891f40796d97d35b/FLAG74faf45ee [2020-08-21 21:29:53,074 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:29:53,075 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-08-21 21:29:53,081 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4e44312c9/88be6162db6c4748891f40796d97d35b/FLAG74faf45ee [2020-08-21 21:29:53,094 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/4e44312c9/88be6162db6c4748891f40796d97d35b [2020-08-21 21:29:53,112 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:29:53,114 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:29:53,117 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:53,117 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:29:53,133 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:29:53,135 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,145 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@191a9bc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53, skipping insertion in model container [2020-08-21 21:29:53,145 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,155 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:29:53,175 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:29:53,394 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:53,400 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:29:53,418 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:29:53,436 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:29:53,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53 WrapperNode [2020-08-21 21:29:53,437 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:29:53,438 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:29:53,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:29:53,438 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:29:53,451 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,452 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,456 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,457 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,542 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,547 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,548 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... [2020-08-21 21:29:53,549 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:29:53,550 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:29:53,550 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:29:53,550 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:29:53,551 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:29:53,609 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:29:53,609 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:29:53,609 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 21:29:53,610 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:29:53,610 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:29:53,610 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 21:29:53,610 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:29:53,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:29:53,610 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:29:53,775 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:29:53,776 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 21:29:53,780 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:53 BoogieIcfgContainer [2020-08-21 21:29:53,780 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:29:53,781 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:29:53,781 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:29:53,785 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:29:53,785 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:29:53" (1/3) ... [2020-08-21 21:29:53,786 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7528caf1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:53, skipping insertion in model container [2020-08-21 21:29:53,786 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:29:53" (2/3) ... [2020-08-21 21:29:53,787 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7528caf1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:29:53, skipping insertion in model container [2020-08-21 21:29:53,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:29:53" (3/3) ... [2020-08-21 21:29:53,789 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-08-21 21:29:53,800 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:29:53,808 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:29:53,823 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:29:53,848 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:29:53,848 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:29:53,848 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:29:53,849 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:29:53,849 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:29:53,849 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:29:53,849 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:29:53,849 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:29:53,868 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-08-21 21:29:53,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 21:29:53,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:53,876 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:53,876 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:53,882 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:53,882 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-08-21 21:29:53,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:53,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42794086] [2020-08-21 21:29:53,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:53,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42794086] [2020-08-21 21:29:54,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:29:54,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:29:54,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895921634] [2020-08-21 21:29:54,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:29:54,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:29:54,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:29:54,133 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-08-21 21:29:54,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,179 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 21:29:54,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:29:54,182 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 21:29:54,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,192 INFO L225 Difference]: With dead ends: 29 [2020-08-21 21:29:54,192 INFO L226 Difference]: Without dead ends: 12 [2020-08-21 21:29:54,196 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 [2020-08-21 21:29:54,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-08-21 21:29:54,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-08-21 21:29:54,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-08-21 21:29:54,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-08-21 21:29:54,244 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-08-21 21:29:54,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,245 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-08-21 21:29:54,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:29:54,245 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-08-21 21:29:54,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-08-21 21:29:54,246 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,246 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,247 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:29:54,247 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,248 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-08-21 21:29:54,248 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,249 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1774336077] [2020-08-21 21:29:54,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,367 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1774336077] [2020-08-21 21:29:54,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 21:29:54,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244453820] [2020-08-21 21:29:54,371 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:29:54,371 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:29:54,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:29:54,372 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 4 states. [2020-08-21 21:29:54,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,393 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-08-21 21:29:54,393 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:29:54,394 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 11 [2020-08-21 21:29:54,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,395 INFO L225 Difference]: With dead ends: 18 [2020-08-21 21:29:54,395 INFO L226 Difference]: Without dead ends: 13 [2020-08-21 21:29:54,396 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 [2020-08-21 21:29:54,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-08-21 21:29:54,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-08-21 21:29:54,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-08-21 21:29:54,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-08-21 21:29:54,401 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-08-21 21:29:54,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,402 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-08-21 21:29:54,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:29:54,402 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-08-21 21:29:54,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 21:29:54,403 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,403 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:29:54,404 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1490448798, now seen corresponding path program 2 times [2020-08-21 21:29:54,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126345375] [2020-08-21 21:29:54,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,537 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126345375] [2020-08-21 21:29:54,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,538 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:29:54,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423035851] [2020-08-21 21:29:54,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:29:54,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:29:54,541 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:29:54,541 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 5 states. [2020-08-21 21:29:54,570 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,570 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-08-21 21:29:54,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:29:54,571 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2020-08-21 21:29:54,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,572 INFO L225 Difference]: With dead ends: 19 [2020-08-21 21:29:54,573 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 21:29:54,573 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 [2020-08-21 21:29:54,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 21:29:54,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 21:29:54,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 21:29:54,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 21:29:54,579 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 21:29:54,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,580 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 21:29:54,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:29:54,580 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 21:29:54,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 21:29:54,581 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,581 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:29:54,582 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,583 INFO L82 PathProgramCache]: Analyzing trace with hash -1004266255, now seen corresponding path program 3 times [2020-08-21 21:29:54,583 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489548886] [2020-08-21 21:29:54,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,700 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489548886] [2020-08-21 21:29:54,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,701 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:29:54,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1605927920] [2020-08-21 21:29:54,702 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:29:54,702 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,702 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:29:54,703 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:29:54,703 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 6 states. [2020-08-21 21:29:54,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,730 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-08-21 21:29:54,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:29:54,731 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 13 [2020-08-21 21:29:54,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,732 INFO L225 Difference]: With dead ends: 20 [2020-08-21 21:29:54,732 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 21:29:54,733 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 [2020-08-21 21:29:54,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 21:29:54,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 21:29:54,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 21:29:54,740 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 21:29:54,740 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 13 [2020-08-21 21:29:54,740 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,741 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 21:29:54,741 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:29:54,741 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 21:29:54,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 21:29:54,743 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,744 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:29:54,744 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 4 times [2020-08-21 21:29:54,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,746 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1782290021] [2020-08-21 21:29:54,746 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:54,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:54,918 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:54,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1782290021] [2020-08-21 21:29:54,919 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:54,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:29:54,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1885001214] [2020-08-21 21:29:54,920 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:29:54,920 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:54,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:29:54,921 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:29:54,921 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 7 states. [2020-08-21 21:29:54,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:54,961 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-08-21 21:29:54,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:29:54,962 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 14 [2020-08-21 21:29:54,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:54,962 INFO L225 Difference]: With dead ends: 21 [2020-08-21 21:29:54,963 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 21:29:54,963 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 [2020-08-21 21:29:54,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 21:29:54,968 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 21:29:54,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 21:29:54,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-08-21 21:29:54,970 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 14 [2020-08-21 21:29:54,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:54,970 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-08-21 21:29:54,970 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:29:54,970 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-08-21 21:29:54,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 21:29:54,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:54,971 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:54,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:29:54,972 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:54,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:54,973 INFO L82 PathProgramCache]: Analyzing trace with hash -1860436335, now seen corresponding path program 5 times [2020-08-21 21:29:54,973 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:54,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2062003195] [2020-08-21 21:29:54,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:54,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,141 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,145 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2062003195] [2020-08-21 21:29:55,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:29:55,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [376265973] [2020-08-21 21:29:55,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:29:55,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:29:55,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:29:55,148 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 8 states. [2020-08-21 21:29:55,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:55,194 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 21:29:55,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:29:55,195 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 15 [2020-08-21 21:29:55,195 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:55,195 INFO L225 Difference]: With dead ends: 22 [2020-08-21 21:29:55,196 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 21:29:55,196 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 [2020-08-21 21:29:55,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 21:29:55,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 21:29:55,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 21:29:55,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 21:29:55,202 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-08-21 21:29:55,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:55,202 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 21:29:55,202 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:29:55,203 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 21:29:55,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 21:29:55,203 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:55,203 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:55,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:29:55,204 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:55,204 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:55,204 INFO L82 PathProgramCache]: Analyzing trace with hash -1802490274, now seen corresponding path program 6 times [2020-08-21 21:29:55,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:55,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1880898532] [2020-08-21 21:29:55,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:55,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,340 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1880898532] [2020-08-21 21:29:55,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:29:55,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552789154] [2020-08-21 21:29:55,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:29:55,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:29:55,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:29:55,343 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 9 states. [2020-08-21 21:29:55,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:55,398 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2020-08-21 21:29:55,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:29:55,399 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 16 [2020-08-21 21:29:55,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:55,400 INFO L225 Difference]: With dead ends: 23 [2020-08-21 21:29:55,400 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 21:29:55,401 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 [2020-08-21 21:29:55,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 21:29:55,405 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 21:29:55,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 21:29:55,406 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-08-21 21:29:55,407 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 16 [2020-08-21 21:29:55,407 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:55,407 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-08-21 21:29:55,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:29:55,407 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-08-21 21:29:55,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 21:29:55,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:55,408 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:55,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:29:55,409 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:55,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:55,409 INFO L82 PathProgramCache]: Analyzing trace with hash -6162383, now seen corresponding path program 7 times [2020-08-21 21:29:55,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:55,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943977493] [2020-08-21 21:29:55,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:55,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,586 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,587 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943977493] [2020-08-21 21:29:55,587 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,587 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:29:55,587 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257256675] [2020-08-21 21:29:55,588 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:29:55,588 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:29:55,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:29:55,589 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 10 states. [2020-08-21 21:29:55,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:55,643 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 21:29:55,644 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:29:55,644 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 17 [2020-08-21 21:29:55,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:55,645 INFO L225 Difference]: With dead ends: 24 [2020-08-21 21:29:55,645 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 21:29:55,646 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 [2020-08-21 21:29:55,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 21:29:55,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 21:29:55,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 21:29:55,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 21:29:55,652 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 17 [2020-08-21 21:29:55,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:55,652 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 21:29:55,652 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:29:55,652 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 21:29:55,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 21:29:55,653 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:55,653 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:55,653 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:29:55,654 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:55,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:55,654 INFO L82 PathProgramCache]: Analyzing trace with hash -154572610, now seen corresponding path program 8 times [2020-08-21 21:29:55,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:55,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [629054668] [2020-08-21 21:29:55,655 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:55,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,832 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:55,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:55,835 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:55,835 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [629054668] [2020-08-21 21:29:55,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:55,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:29:55,836 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866475775] [2020-08-21 21:29:55,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:29:55,837 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:55,837 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:29:55,837 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:29:55,838 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 11 states. [2020-08-21 21:29:55,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:55,907 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2020-08-21 21:29:55,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:29:55,908 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 18 [2020-08-21 21:29:55,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:55,908 INFO L225 Difference]: With dead ends: 25 [2020-08-21 21:29:55,909 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 21:29:55,909 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 [2020-08-21 21:29:55,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 21:29:55,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 21:29:55,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 21:29:55,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 21:29:55,915 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2020-08-21 21:29:55,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:55,915 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 21:29:55,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:29:55,915 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 21:29:55,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 21:29:55,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:55,916 INFO L422 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:55,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:29:55,917 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:55,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:55,917 INFO L82 PathProgramCache]: Analyzing trace with hash -460322351, now seen corresponding path program 9 times [2020-08-21 21:29:55,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:55,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1635096549] [2020-08-21 21:29:55,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:55,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:56,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,101 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:56,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1635096549] [2020-08-21 21:29:56,102 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:56,102 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:29:56,102 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075257139] [2020-08-21 21:29:56,104 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:29:56,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:56,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:29:56,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:29:56,105 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 12 states. [2020-08-21 21:29:56,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:56,209 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 21:29:56,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:29:56,210 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-08-21 21:29:56,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:56,211 INFO L225 Difference]: With dead ends: 26 [2020-08-21 21:29:56,211 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 21:29:56,212 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 [2020-08-21 21:29:56,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 21:29:56,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 21:29:56,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 21:29:56,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 21:29:56,222 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2020-08-21 21:29:56,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:56,223 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 21:29:56,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:29:56,225 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 21:29:56,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:29:56,226 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:56,226 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:56,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:29:56,226 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:56,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:56,227 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 10 times [2020-08-21 21:29:56,227 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:56,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [341279879] [2020-08-21 21:29:56,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:56,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,443 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:56,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,446 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:56,447 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [341279879] [2020-08-21 21:29:56,447 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:56,447 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:29:56,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464769365] [2020-08-21 21:29:56,448 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:29:56,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:56,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:29:56,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:29:56,450 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 13 states. [2020-08-21 21:29:56,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:56,571 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2020-08-21 21:29:56,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:29:56,572 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 20 [2020-08-21 21:29:56,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:56,572 INFO L225 Difference]: With dead ends: 27 [2020-08-21 21:29:56,573 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 21:29:56,573 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 [2020-08-21 21:29:56,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 21:29:56,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2020-08-21 21:29:56,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 21:29:56,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2020-08-21 21:29:56,578 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2020-08-21 21:29:56,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:56,579 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2020-08-21 21:29:56,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:29:56,579 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2020-08-21 21:29:56,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 21:29:56,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:56,580 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:56,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:29:56,580 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:56,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:56,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1178612593, now seen corresponding path program 11 times [2020-08-21 21:29:56,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:56,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [825489748] [2020-08-21 21:29:56,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:56,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,773 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:56,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:56,776 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:56,776 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [825489748] [2020-08-21 21:29:56,776 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:56,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:29:56,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506849680] [2020-08-21 21:29:56,777 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:29:56,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:56,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:29:56,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:29:56,778 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 14 states. [2020-08-21 21:29:56,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:56,888 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 21:29:56,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:29:56,888 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 21 [2020-08-21 21:29:56,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:56,889 INFO L225 Difference]: With dead ends: 28 [2020-08-21 21:29:56,889 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 21:29:56,890 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 [2020-08-21 21:29:56,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 21:29:56,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 21:29:56,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 21:29:56,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 21:29:56,895 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2020-08-21 21:29:56,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:56,895 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 21:29:56,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:29:56,895 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 21:29:56,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 21:29:56,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:56,896 INFO L422 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:56,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:29:56,897 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:56,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:56,897 INFO L82 PathProgramCache]: Analyzing trace with hash -2081254018, now seen corresponding path program 12 times [2020-08-21 21:29:56,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:56,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [207164847] [2020-08-21 21:29:56,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:56,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:57,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,136 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:57,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [207164847] [2020-08-21 21:29:57,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:57,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:29:57,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354408750] [2020-08-21 21:29:57,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:29:57,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:57,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:29:57,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:57,139 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 15 states. [2020-08-21 21:29:57,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:57,263 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 21:29:57,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:29:57,263 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 22 [2020-08-21 21:29:57,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:57,264 INFO L225 Difference]: With dead ends: 29 [2020-08-21 21:29:57,264 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 21:29:57,265 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:29:57,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 21:29:57,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 21:29:57,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 21:29:57,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2020-08-21 21:29:57,270 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2020-08-21 21:29:57,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:57,270 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2020-08-21 21:29:57,270 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:29:57,270 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2020-08-21 21:29:57,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 21:29:57,271 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:57,271 INFO L422 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:57,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:29:57,272 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:57,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:57,272 INFO L82 PathProgramCache]: Analyzing trace with hash -57903855, now seen corresponding path program 13 times [2020-08-21 21:29:57,272 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:57,272 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463058679] [2020-08-21 21:29:57,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:57,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:57,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,514 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:57,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463058679] [2020-08-21 21:29:57,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:57,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:29:57,516 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985397186] [2020-08-21 21:29:57,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:29:57,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:57,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:29:57,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:57,517 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2020-08-21 21:29:57,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:57,651 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 21:29:57,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:29:57,651 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2020-08-21 21:29:57,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:57,652 INFO L225 Difference]: With dead ends: 30 [2020-08-21 21:29:57,652 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 21:29:57,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=42, Invalid=198, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:29:57,653 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 21:29:57,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 21:29:57,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 21:29:57,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 21:29:57,660 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2020-08-21 21:29:57,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:57,661 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 21:29:57,661 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:29:57,661 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 21:29:57,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:29:57,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:57,663 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:57,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:29:57,665 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:57,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:57,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1758558242, now seen corresponding path program 14 times [2020-08-21 21:29:57,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:57,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1824089150] [2020-08-21 21:29:57,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:57,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:57,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:57,909 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:57,910 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1824089150] [2020-08-21 21:29:57,910 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:57,910 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:29:57,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384402805] [2020-08-21 21:29:57,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:29:57,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:57,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:29:57,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:57,912 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 17 states. [2020-08-21 21:29:58,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:58,067 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2020-08-21 21:29:58,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:29:58,067 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 24 [2020-08-21 21:29:58,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:58,068 INFO L225 Difference]: With dead ends: 31 [2020-08-21 21:29:58,068 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 21:29:58,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:29:58,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 21:29:58,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 21:29:58,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 21:29:58,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 21:29:58,074 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2020-08-21 21:29:58,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:58,074 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 21:29:58,074 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:29:58,074 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 21:29:58,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 21:29:58,075 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:58,075 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:58,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:29:58,076 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:58,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:58,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1355730609, now seen corresponding path program 15 times [2020-08-21 21:29:58,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:58,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395769677] [2020-08-21 21:29:58,077 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:58,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:58,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,385 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:58,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395769677] [2020-08-21 21:29:58,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:58,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:29:58,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183500180] [2020-08-21 21:29:58,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:29:58,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:58,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:29:58,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=258, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:29:58,387 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 18 states. [2020-08-21 21:29:58,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:58,601 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 21:29:58,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:29:58,602 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 25 [2020-08-21 21:29:58,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:58,603 INFO L225 Difference]: With dead ends: 32 [2020-08-21 21:29:58,603 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 21:29:58,604 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 [2020-08-21 21:29:58,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 21:29:58,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 21:29:58,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 21:29:58,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 21:29:58,608 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2020-08-21 21:29:58,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:58,609 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 21:29:58,609 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:29:58,609 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 21:29:58,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 21:29:58,610 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:58,610 INFO L422 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:58,610 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:29:58,610 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:58,610 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:58,611 INFO L82 PathProgramCache]: Analyzing trace with hash -885562818, now seen corresponding path program 16 times [2020-08-21 21:29:58,611 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:58,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [375757380] [2020-08-21 21:29:58,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:58,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:58,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:58,923 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:58,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [375757380] [2020-08-21 21:29:58,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:58,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:29:58,925 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513020875] [2020-08-21 21:29:58,925 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:29:58,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:58,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:29:58,926 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:58,926 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 19 states. [2020-08-21 21:29:59,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:59,156 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2020-08-21 21:29:59,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:29:59,158 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 26 [2020-08-21 21:29:59,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:59,159 INFO L225 Difference]: With dead ends: 33 [2020-08-21 21:29:59,159 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 21:29:59,160 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:59,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 21:29:59,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-08-21 21:29:59,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 21:29:59,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-08-21 21:29:59,165 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2020-08-21 21:29:59,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:59,165 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-08-21 21:29:59,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:29:59,165 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-08-21 21:29:59,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 21:29:59,166 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:59,166 INFO L422 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:59,166 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:29:59,167 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:59,167 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:59,167 INFO L82 PathProgramCache]: Analyzing trace with hash -1646182319, now seen corresponding path program 17 times [2020-08-21 21:29:59,167 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:59,168 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848087429] [2020-08-21 21:29:59,168 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:59,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:59,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:59,513 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:29:59,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848087429] [2020-08-21 21:29:59,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:59,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:29:59,514 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130191296] [2020-08-21 21:29:59,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:29:59,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:59,517 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:29:59,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:59,517 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 20 states. [2020-08-21 21:29:59,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:59,757 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 21:29:59,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:29:59,757 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 27 [2020-08-21 21:29:59,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:59,758 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:29:59,758 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 21:29:59,759 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=54, Invalid=326, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:59,759 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 21:29:59,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 21:29:59,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:29:59,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 21:29:59,765 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2020-08-21 21:29:59,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:59,765 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 21:29:59,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:29:59,765 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 21:29:59,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:29:59,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:59,766 INFO L422 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:59,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:29:59,767 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:59,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:59,767 INFO L82 PathProgramCache]: Analyzing trace with hash 544416926, now seen corresponding path program 18 times [2020-08-21 21:29:59,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:59,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763849092] [2020-08-21 21:29:59,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:59,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:00,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,128 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:00,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763849092] [2020-08-21 21:30:00,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:00,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:30:00,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1519444922] [2020-08-21 21:30:00,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:30:00,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:00,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:30:00,131 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=363, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:30:00,131 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 21 states. [2020-08-21 21:30:00,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:00,387 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 21:30:00,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:30:00,387 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 28 [2020-08-21 21:30:00,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:00,388 INFO L225 Difference]: With dead ends: 35 [2020-08-21 21:30:00,388 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 21:30:00,390 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 [2020-08-21 21:30:00,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 21:30:00,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 21:30:00,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 21:30:00,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2020-08-21 21:30:00,400 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2020-08-21 21:30:00,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:00,400 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2020-08-21 21:30:00,400 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:30:00,400 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2020-08-21 21:30:00,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 21:30:00,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:00,404 INFO L422 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:00,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:30:00,405 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:00,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:00,405 INFO L82 PathProgramCache]: Analyzing trace with hash -266483215, now seen corresponding path program 19 times [2020-08-21 21:30:00,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:00,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1466106812] [2020-08-21 21:30:00,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:00,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:00,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:00,809 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:00,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1466106812] [2020-08-21 21:30:00,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:00,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:30:00,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1530735416] [2020-08-21 21:30:00,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:30:00,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:00,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:30:00,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=402, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:30:00,811 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 22 states. [2020-08-21 21:30:01,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:01,093 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 21:30:01,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:30:01,094 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 29 [2020-08-21 21:30:01,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:01,095 INFO L225 Difference]: With dead ends: 36 [2020-08-21 21:30:01,095 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 21:30:01,095 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 [2020-08-21 21:30:01,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 21:30:01,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-08-21 21:30:01,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:30:01,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 21:30:01,100 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2020-08-21 21:30:01,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:01,100 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 21:30:01,101 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:30:01,101 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 21:30:01,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:30:01,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:01,102 INFO L422 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:01,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:30:01,102 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:01,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:01,102 INFO L82 PathProgramCache]: Analyzing trace with hash 365416190, now seen corresponding path program 20 times [2020-08-21 21:30:01,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:01,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1930874000] [2020-08-21 21:30:01,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:01,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:01,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:01,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:01,512 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:01,513 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1930874000] [2020-08-21 21:30:01,513 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:01,513 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:30:01,513 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406719328] [2020-08-21 21:30:01,515 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:30:01,515 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:01,515 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:30:01,516 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=443, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:30:01,516 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 23 states. [2020-08-21 21:30:01,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:01,775 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2020-08-21 21:30:01,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:30:01,776 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 30 [2020-08-21 21:30:01,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:01,776 INFO L225 Difference]: With dead ends: 37 [2020-08-21 21:30:01,777 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 21:30:01,777 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 [2020-08-21 21:30:01,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 21:30:01,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 21:30:01,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 21:30:01,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 21:30:01,782 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2020-08-21 21:30:01,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:01,782 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 21:30:01,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:30:01,782 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 21:30:01,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 21:30:01,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:01,783 INFO L422 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:01,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:30:01,783 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:01,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:01,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1520538735, now seen corresponding path program 21 times [2020-08-21 21:30:01,784 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:01,784 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [937922150] [2020-08-21 21:30:01,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:01,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:02,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:02,287 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:02,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [937922150] [2020-08-21 21:30:02,288 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:02,288 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:30:02,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [17969798] [2020-08-21 21:30:02,289 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:30:02,289 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:02,289 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:30:02,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:30:02,289 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 24 states. [2020-08-21 21:30:02,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:02,591 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 21:30:02,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:30:02,594 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 31 [2020-08-21 21:30:02,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:02,594 INFO L225 Difference]: With dead ends: 38 [2020-08-21 21:30:02,594 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 21:30:02,595 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=486, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:30:02,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 21:30:02,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 21:30:02,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:30:02,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 21:30:02,604 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2020-08-21 21:30:02,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:02,605 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 21:30:02,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:30:02,605 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 21:30:02,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:30:02,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:02,607 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:02,607 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:30:02,607 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:02,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:02,608 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 22 times [2020-08-21 21:30:02,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:02,609 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [926766914] [2020-08-21 21:30:02,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:02,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:03,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:03,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:03,073 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:03,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [926766914] [2020-08-21 21:30:03,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:03,077 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:30:03,077 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468056039] [2020-08-21 21:30:03,077 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:30:03,077 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:03,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:30:03,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:30:03,078 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 25 states. [2020-08-21 21:30:03,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:03,469 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2020-08-21 21:30:03,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:30:03,470 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 32 [2020-08-21 21:30:03,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:03,471 INFO L225 Difference]: With dead ends: 39 [2020-08-21 21:30:03,471 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:30:03,472 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=69, Invalid=531, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:30:03,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:30:03,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 21:30:03,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 21:30:03,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2020-08-21 21:30:03,483 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2020-08-21 21:30:03,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:03,488 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2020-08-21 21:30:03,489 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:30:03,489 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2020-08-21 21:30:03,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 21:30:03,490 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:03,490 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:03,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:30:03,490 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:03,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:03,491 INFO L82 PathProgramCache]: Analyzing trace with hash 217916721, now seen corresponding path program 23 times [2020-08-21 21:30:03,491 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:03,491 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124863508] [2020-08-21 21:30:03,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:03,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:04,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:04,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:04,017 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:04,017 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124863508] [2020-08-21 21:30:04,018 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:04,018 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 21:30:04,018 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [608351960] [2020-08-21 21:30:04,018 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 21:30:04,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:04,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 21:30:04,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=578, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:30:04,019 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 26 states. [2020-08-21 21:30:04,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:04,403 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 21:30:04,404 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 21:30:04,404 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 33 [2020-08-21 21:30:04,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:04,405 INFO L225 Difference]: With dead ends: 40 [2020-08-21 21:30:04,405 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 21:30:04,406 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 [2020-08-21 21:30:04,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 21:30:04,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 21:30:04,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:30:04,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 21:30:04,410 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2020-08-21 21:30:04,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:04,410 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 21:30:04,410 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 21:30:04,410 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 21:30:04,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:30:04,411 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:04,411 INFO L422 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:04,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:30:04,411 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:04,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:04,412 INFO L82 PathProgramCache]: Analyzing trace with hash -1798054978, now seen corresponding path program 24 times [2020-08-21 21:30:04,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:04,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1266808969] [2020-08-21 21:30:04,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:04,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:05,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,042 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:05,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1266808969] [2020-08-21 21:30:05,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:05,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 21:30:05,043 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2005591868] [2020-08-21 21:30:05,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 21:30:05,044 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:05,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 21:30:05,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:30:05,045 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 27 states. [2020-08-21 21:30:05,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:05,407 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 21:30:05,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 21:30:05,407 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 34 [2020-08-21 21:30:05,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:05,408 INFO L225 Difference]: With dead ends: 41 [2020-08-21 21:30:05,408 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:30:05,409 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 [2020-08-21 21:30:05,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:30:05,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 21:30:05,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 21:30:05,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2020-08-21 21:30:05,413 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2020-08-21 21:30:05,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:05,413 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2020-08-21 21:30:05,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 21:30:05,414 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2020-08-21 21:30:05,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 21:30:05,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:05,414 INFO L422 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:05,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:30:05,414 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:05,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:05,415 INFO L82 PathProgramCache]: Analyzing trace with hash 131331793, now seen corresponding path program 25 times [2020-08-21 21:30:05,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:05,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1724068762] [2020-08-21 21:30:05,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:05,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,983 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:05,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:05,989 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:05,989 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1724068762] [2020-08-21 21:30:05,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:05,990 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 21:30:05,990 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259908862] [2020-08-21 21:30:05,992 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 21:30:05,993 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:05,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 21:30:05,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:30:05,994 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 28 states. [2020-08-21 21:30:06,447 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:06,447 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 21:30:06,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 21:30:06,448 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 35 [2020-08-21 21:30:06,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:06,449 INFO L225 Difference]: With dead ends: 42 [2020-08-21 21:30:06,449 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 21:30:06,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=78, Invalid=678, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:30:06,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 21:30:06,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 21:30:06,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:30:06,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 21:30:06,459 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2020-08-21 21:30:06,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:06,460 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 21:30:06,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 21:30:06,460 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 21:30:06,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:30:06,460 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:06,461 INFO L422 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:06,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:30:06,461 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:06,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:06,461 INFO L82 PathProgramCache]: Analyzing trace with hash -187220450, now seen corresponding path program 26 times [2020-08-21 21:30:06,461 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:06,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858750090] [2020-08-21 21:30:06,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:06,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:07,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:07,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:07,091 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:07,091 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858750090] [2020-08-21 21:30:07,091 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:07,091 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 21:30:07,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035480789] [2020-08-21 21:30:07,092 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 21:30:07,092 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:07,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 21:30:07,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=731, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:30:07,093 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 29 states. [2020-08-21 21:30:07,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:07,618 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2020-08-21 21:30:07,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 21:30:07,619 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 36 [2020-08-21 21:30:07,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:07,620 INFO L225 Difference]: With dead ends: 43 [2020-08-21 21:30:07,620 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:30:07,621 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 [2020-08-21 21:30:07,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:30:07,625 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 21:30:07,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 21:30:07,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 21:30:07,626 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2020-08-21 21:30:07,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:07,626 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 21:30:07,626 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 21:30:07,627 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 21:30:07,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 21:30:07,627 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:07,627 INFO L422 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:07,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:30:07,628 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:07,628 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:07,628 INFO L82 PathProgramCache]: Analyzing trace with hash -1472405391, now seen corresponding path program 27 times [2020-08-21 21:30:07,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:07,629 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781891252] [2020-08-21 21:30:07,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:07,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:08,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:08,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:08,305 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:08,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781891252] [2020-08-21 21:30:08,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:08,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 21:30:08,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [488431596] [2020-08-21 21:30:08,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 21:30:08,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:08,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 21:30:08,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:30:08,307 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 30 states. [2020-08-21 21:30:08,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:08,851 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 21:30:08,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 21:30:08,852 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 37 [2020-08-21 21:30:08,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:08,852 INFO L225 Difference]: With dead ends: 44 [2020-08-21 21:30:08,853 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 21:30:08,853 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=84, Invalid=786, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:30:08,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 21:30:08,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 21:30:08,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:30:08,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 21:30:08,857 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2020-08-21 21:30:08,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:08,857 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 21:30:08,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 21:30:08,857 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 21:30:08,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:30:08,858 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:08,858 INFO L422 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:08,858 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:30:08,858 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:08,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:08,859 INFO L82 PathProgramCache]: Analyzing trace with hash 1636534398, now seen corresponding path program 28 times [2020-08-21 21:30:08,859 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:08,859 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021967706] [2020-08-21 21:30:08,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:08,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:09,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:09,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:09,590 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:09,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021967706] [2020-08-21 21:30:09,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:09,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 21:30:09,591 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1656315118] [2020-08-21 21:30:09,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 21:30:09,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:09,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 21:30:09,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:30:09,593 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 31 states. [2020-08-21 21:30:10,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:10,142 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2020-08-21 21:30:10,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 21:30:10,143 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 38 [2020-08-21 21:30:10,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:10,144 INFO L225 Difference]: With dead ends: 45 [2020-08-21 21:30:10,144 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:30:10,144 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:30:10,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:30:10,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 21:30:10,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 21:30:10,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2020-08-21 21:30:10,152 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2020-08-21 21:30:10,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:10,152 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2020-08-21 21:30:10,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 21:30:10,152 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2020-08-21 21:30:10,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 21:30:10,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:10,153 INFO L422 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:10,153 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 21:30:10,153 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:10,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:10,154 INFO L82 PathProgramCache]: Analyzing trace with hash -770579951, now seen corresponding path program 29 times [2020-08-21 21:30:10,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:10,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2016919064] [2020-08-21 21:30:10,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:10,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:10,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:10,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:10,933 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:10,934 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2016919064] [2020-08-21 21:30:10,934 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:10,934 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 21:30:10,934 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419270552] [2020-08-21 21:30:10,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 21:30:10,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:10,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 21:30:10,935 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=902, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:30:10,935 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 32 states. [2020-08-21 21:30:11,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:11,547 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 21:30:11,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 21:30:11,548 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 39 [2020-08-21 21:30:11,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:11,549 INFO L225 Difference]: With dead ends: 46 [2020-08-21 21:30:11,549 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 21:30:11,550 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 [2020-08-21 21:30:11,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 21:30:11,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 21:30:11,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:30:11,554 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 21:30:11,554 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2020-08-21 21:30:11,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:11,554 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 21:30:11,555 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 21:30:11,555 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 21:30:11,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 21:30:11,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:11,555 INFO L422 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:11,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 21:30:11,555 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:11,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:11,556 INFO L82 PathProgramCache]: Analyzing trace with hash 1918286558, now seen corresponding path program 30 times [2020-08-21 21:30:11,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:11,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [552885948] [2020-08-21 21:30:11,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:11,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:12,353 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:12,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:12,358 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:12,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [552885948] [2020-08-21 21:30:12,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:12,359 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 21:30:12,359 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064394941] [2020-08-21 21:30:12,360 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 21:30:12,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:12,360 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 21:30:12,360 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=963, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:30:12,361 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 33 states. [2020-08-21 21:30:12,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:12,997 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 21:30:12,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 21:30:12,999 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 40 [2020-08-21 21:30:12,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:12,999 INFO L225 Difference]: With dead ends: 47 [2020-08-21 21:30:13,000 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 21:30:13,000 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 [2020-08-21 21:30:13,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 21:30:13,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 21:30:13,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 21:30:13,005 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2020-08-21 21:30:13,005 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2020-08-21 21:30:13,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:13,005 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2020-08-21 21:30:13,005 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 21:30:13,006 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2020-08-21 21:30:13,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 21:30:13,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:13,006 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:13,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 21:30:13,007 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:13,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:13,007 INFO L82 PathProgramCache]: Analyzing trace with hash -626197583, now seen corresponding path program 31 times [2020-08-21 21:30:13,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:13,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1706273504] [2020-08-21 21:30:13,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:13,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:13,828 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:13,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:13,833 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:13,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1706273504] [2020-08-21 21:30:13,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:13,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 21:30:13,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413031437] [2020-08-21 21:30:13,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 21:30:13,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:13,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 21:30:13,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=1026, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:30:13,835 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 34 states. [2020-08-21 21:30:14,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:14,528 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 21:30:14,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 21:30:14,529 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 41 [2020-08-21 21:30:14,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:14,529 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:30:14,529 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 21:30:14,530 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 [2020-08-21 21:30:14,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 21:30:14,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 21:30:14,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:30:14,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 21:30:14,534 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2020-08-21 21:30:14,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:14,534 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 21:30:14,534 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 21:30:14,534 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 21:30:14,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 21:30:14,535 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:14,535 INFO L422 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:14,535 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 21:30:14,535 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:14,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:14,535 INFO L82 PathProgramCache]: Analyzing trace with hash 2099172670, now seen corresponding path program 32 times [2020-08-21 21:30:14,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:14,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1407075679] [2020-08-21 21:30:14,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:14,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:15,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:15,417 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:15,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1407075679] [2020-08-21 21:30:15,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:15,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 21:30:15,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668122536] [2020-08-21 21:30:15,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 21:30:15,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:15,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 21:30:15,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=99, Invalid=1091, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:15,419 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 35 states. [2020-08-21 21:30:16,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:16,166 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2020-08-21 21:30:16,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 21:30:16,167 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 42 [2020-08-21 21:30:16,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:16,168 INFO L225 Difference]: With dead ends: 49 [2020-08-21 21:30:16,168 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 21:30:16,169 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 [2020-08-21 21:30:16,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 21:30:16,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 21:30:16,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 21:30:16,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 21:30:16,173 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2020-08-21 21:30:16,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:16,173 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 21:30:16,173 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 21:30:16,173 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 21:30:16,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 21:30:16,174 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:16,174 INFO L422 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:16,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 21:30:16,174 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:16,174 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:16,175 INFO L82 PathProgramCache]: Analyzing trace with hash 686304593, now seen corresponding path program 33 times [2020-08-21 21:30:16,175 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:16,175 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125793699] [2020-08-21 21:30:16,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:16,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:17,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:17,097 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:17,098 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125793699] [2020-08-21 21:30:17,098 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:17,098 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 21:30:17,099 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073575396] [2020-08-21 21:30:17,099 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 21:30:17,099 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:17,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 21:30:17,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:17,101 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 36 states. [2020-08-21 21:30:17,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:17,840 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 21:30:17,840 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 21:30:17,841 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 43 [2020-08-21 21:30:17,841 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:17,841 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:30:17,842 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 21:30:17,842 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=102, Invalid=1158, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:30:17,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 21:30:17,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 21:30:17,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 21:30:17,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 21:30:17,847 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2020-08-21 21:30:17,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:17,847 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 21:30:17,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 21:30:17,847 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 21:30:17,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:30:17,848 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:17,848 INFO L422 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:17,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 21:30:17,848 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:17,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:17,848 INFO L82 PathProgramCache]: Analyzing trace with hash -162932834, now seen corresponding path program 34 times [2020-08-21 21:30:17,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:17,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531144938] [2020-08-21 21:30:17,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:17,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,879 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:18,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:18,885 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:18,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531144938] [2020-08-21 21:30:18,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:18,885 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 21:30:18,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681854890] [2020-08-21 21:30:18,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 21:30:18,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:18,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 21:30:18,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=1227, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:18,887 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 37 states. [2020-08-21 21:30:19,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:19,698 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2020-08-21 21:30:19,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 21:30:19,698 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 44 [2020-08-21 21:30:19,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:19,699 INFO L225 Difference]: With dead ends: 51 [2020-08-21 21:30:19,699 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:30:19,700 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 [2020-08-21 21:30:19,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:30:19,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 21:30:19,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 21:30:19,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2020-08-21 21:30:19,704 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2020-08-21 21:30:19,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:19,704 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2020-08-21 21:30:19,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 21:30:19,704 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2020-08-21 21:30:19,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 21:30:19,705 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:19,705 INFO L422 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:19,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 21:30:19,705 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:19,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:19,705 INFO L82 PathProgramCache]: Analyzing trace with hash -719489295, now seen corresponding path program 35 times [2020-08-21 21:30:19,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:19,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410987726] [2020-08-21 21:30:19,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:19,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,753 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,753 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410987726] [2020-08-21 21:30:20,753 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,753 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 21:30:20,753 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1111684294] [2020-08-21 21:30:20,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 21:30:20,754 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,754 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 21:30:20,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:20,754 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 38 states. [2020-08-21 21:30:21,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,635 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 21:30:21,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 21:30:21,637 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 45 [2020-08-21 21:30:21,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,638 INFO L225 Difference]: With dead ends: 52 [2020-08-21 21:30:21,638 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 21:30:21,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=108, Invalid=1298, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:30:21,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 21:30:21,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 21:30:21,642 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 21:30:21,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 21:30:21,642 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2020-08-21 21:30:21,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,643 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 21:30:21,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 21:30:21,643 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 21:30:21,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 21:30:21,643 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,644 INFO L422 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,644 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 21:30:21,644 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,644 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,644 INFO L82 PathProgramCache]: Analyzing trace with hash -792870402, now seen corresponding path program 36 times [2020-08-21 21:30:21,645 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,645 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1399445704] [2020-08-21 21:30:21,645 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:22,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,702 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:22,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1399445704] [2020-08-21 21:30:22,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:22,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 21:30:22,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [742335194] [2020-08-21 21:30:22,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 21:30:22,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:22,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 21:30:22,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:22,705 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 39 states. [2020-08-21 21:30:23,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:23,631 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2020-08-21 21:30:23,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 21:30:23,632 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 46 [2020-08-21 21:30:23,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:23,633 INFO L225 Difference]: With dead ends: 53 [2020-08-21 21:30:23,633 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 21:30:23,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:23,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 21:30:23,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 21:30:23,638 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 21:30:23,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2020-08-21 21:30:23,638 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2020-08-21 21:30:23,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:23,639 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2020-08-21 21:30:23,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 21:30:23,639 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2020-08-21 21:30:23,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 21:30:23,639 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:23,639 INFO L422 BasicCegarLoop]: trace histogram [37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:23,640 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 21:30:23,640 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:23,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:23,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1227282577, now seen corresponding path program 37 times [2020-08-21 21:30:23,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:23,641 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367750422] [2020-08-21 21:30:23,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:23,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,825 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:24,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,830 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 0 proven. 703 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:24,830 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367750422] [2020-08-21 21:30:24,830 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:24,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 21:30:24,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674811158] [2020-08-21 21:30:24,831 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 21:30:24,831 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:24,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 21:30:24,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:24,832 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 40 states. [2020-08-21 21:30:25,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:25,773 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 21:30:25,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 21:30:25,773 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 47 [2020-08-21 21:30:25,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:25,774 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:30:25,774 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 21:30:25,775 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=114, Invalid=1446, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:30:25,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 21:30:25,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 21:30:25,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:30:25,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 21:30:25,779 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2020-08-21 21:30:25,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:25,780 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 21:30:25,780 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 21:30:25,780 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 21:30:25,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:30:25,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:25,781 INFO L422 BasicCegarLoop]: trace histogram [38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:25,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 21:30:25,781 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:25,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:25,781 INFO L82 PathProgramCache]: Analyzing trace with hash -572484514, now seen corresponding path program 38 times [2020-08-21 21:30:25,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:25,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1989018795] [2020-08-21 21:30:25,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:25,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:26,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,954 INFO L134 CoverageAnalysis]: Checked inductivity of 741 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:26,954 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1989018795] [2020-08-21 21:30:26,954 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:26,954 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 21:30:26,955 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639582743] [2020-08-21 21:30:26,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 21:30:26,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:26,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 21:30:26,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:26,956 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 41 states. [2020-08-21 21:30:28,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:28,005 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2020-08-21 21:30:28,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 21:30:28,005 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 48 [2020-08-21 21:30:28,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:28,006 INFO L225 Difference]: With dead ends: 55 [2020-08-21 21:30:28,007 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 21:30:28,008 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=117, Invalid=1523, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:28,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 21:30:28,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-08-21 21:30:28,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 21:30:28,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2020-08-21 21:30:28,011 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2020-08-21 21:30:28,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:28,012 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2020-08-21 21:30:28,012 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 21:30:28,012 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2020-08-21 21:30:28,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 21:30:28,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:28,013 INFO L422 BasicCegarLoop]: trace histogram [39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:28,013 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 21:30:28,013 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:28,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:28,013 INFO L82 PathProgramCache]: Analyzing trace with hash -530689487, now seen corresponding path program 39 times [2020-08-21 21:30:28,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:28,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [446290409] [2020-08-21 21:30:28,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:28,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:29,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,253 INFO L134 CoverageAnalysis]: Checked inductivity of 780 backedges. 0 proven. 780 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:29,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [446290409] [2020-08-21 21:30:29,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:29,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 21:30:29,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1510508732] [2020-08-21 21:30:29,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 21:30:29,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:29,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 21:30:29,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:30:29,255 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 42 states. [2020-08-21 21:30:30,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:30,341 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 21:30:30,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 21:30:30,345 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 49 [2020-08-21 21:30:30,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:30,345 INFO L225 Difference]: With dead ends: 56 [2020-08-21 21:30:30,345 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 21:30:30,346 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:30:30,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 21:30:30,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 21:30:30,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 21:30:30,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 21:30:30,350 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2020-08-21 21:30:30,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:30,351 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 21:30:30,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 21:30:30,351 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 21:30:30,351 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 21:30:30,351 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:30,352 INFO L422 BasicCegarLoop]: trace histogram [40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:30,352 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 21:30:30,352 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:30,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:30,352 INFO L82 PathProgramCache]: Analyzing trace with hash 764956350, now seen corresponding path program 40 times [2020-08-21 21:30:30,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:30,353 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [25653025] [2020-08-21 21:30:30,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:30,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:31,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:31,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:31,630 INFO L134 CoverageAnalysis]: Checked inductivity of 820 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:31,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [25653025] [2020-08-21 21:30:31,630 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:31,630 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 21:30:31,631 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667043278] [2020-08-21 21:30:31,631 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 21:30:31,631 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:31,631 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 21:30:31,632 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=123, Invalid=1683, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:30:31,632 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 43 states. [2020-08-21 21:30:32,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:32,794 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2020-08-21 21:30:32,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 21:30:32,795 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 50 [2020-08-21 21:30:32,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:32,796 INFO L225 Difference]: With dead ends: 57 [2020-08-21 21:30:32,796 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 21:30:32,798 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 [2020-08-21 21:30:32,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 21:30:32,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-08-21 21:30:32,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 21:30:32,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2020-08-21 21:30:32,802 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2020-08-21 21:30:32,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:32,802 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2020-08-21 21:30:32,802 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 21:30:32,802 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2020-08-21 21:30:32,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 21:30:32,803 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:32,803 INFO L422 BasicCegarLoop]: trace histogram [41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:32,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 21:30:32,803 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:32,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:32,804 INFO L82 PathProgramCache]: Analyzing trace with hash -2019695663, now seen corresponding path program 41 times [2020-08-21 21:30:32,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:32,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1021465051] [2020-08-21 21:30:32,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:32,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:34,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,387 INFO L134 CoverageAnalysis]: Checked inductivity of 861 backedges. 0 proven. 861 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:34,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1021465051] [2020-08-21 21:30:34,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:34,388 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 21:30:34,388 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511329474] [2020-08-21 21:30:34,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 21:30:34,389 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:34,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 21:30:34,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:30:34,389 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 44 states. [2020-08-21 21:30:35,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:35,584 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 21:30:35,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 21:30:35,585 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 51 [2020-08-21 21:30:35,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:35,585 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:30:35,586 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 21:30:35,586 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=126, Invalid=1766, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:30:35,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 21:30:35,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-08-21 21:30:35,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 21:30:35,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 21:30:35,590 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2020-08-21 21:30:35,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:35,590 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 21:30:35,591 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 21:30:35,591 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 21:30:35,591 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 21:30:35,591 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:35,591 INFO L422 BasicCegarLoop]: trace histogram [42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:35,591 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 21:30:35,592 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:35,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:35,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1850405150, now seen corresponding path program 42 times [2020-08-21 21:30:35,592 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:35,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1388898875] [2020-08-21 21:30:35,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:35,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:37,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:37,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:37,022 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:37,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1388898875] [2020-08-21 21:30:37,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:37,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 21:30:37,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22080799] [2020-08-21 21:30:37,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 21:30:37,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:37,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 21:30:37,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=1851, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:30:37,025 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 45 states. [2020-08-21 21:30:38,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:38,279 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2020-08-21 21:30:38,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 21:30:38,281 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 52 [2020-08-21 21:30:38,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:38,281 INFO L225 Difference]: With dead ends: 59 [2020-08-21 21:30:38,282 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 21:30:38,282 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 [2020-08-21 21:30:38,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 21:30:38,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 21:30:38,285 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 21:30:38,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2020-08-21 21:30:38,286 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2020-08-21 21:30:38,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:38,286 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2020-08-21 21:30:38,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 21:30:38,286 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2020-08-21 21:30:38,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 21:30:38,287 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:38,287 INFO L422 BasicCegarLoop]: trace histogram [43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:38,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 21:30:38,287 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:38,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:38,288 INFO L82 PathProgramCache]: Analyzing trace with hash 1564446065, now seen corresponding path program 43 times [2020-08-21 21:30:38,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:38,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1580308781] [2020-08-21 21:30:38,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:38,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:39,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:39,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:39,796 INFO L134 CoverageAnalysis]: Checked inductivity of 946 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:39,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1580308781] [2020-08-21 21:30:39,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:39,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 21:30:39,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553331688] [2020-08-21 21:30:39,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 21:30:39,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:39,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 21:30:39,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=1938, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 21:30:39,797 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 46 states. [2020-08-21 21:30:41,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:41,083 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 21:30:41,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 21:30:41,084 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 53 [2020-08-21 21:30:41,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:41,085 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:30:41,085 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 21:30:41,085 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 [2020-08-21 21:30:41,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 21:30:41,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2020-08-21 21:30:41,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 21:30:41,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 21:30:41,088 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2020-08-21 21:30:41,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:41,088 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 21:30:41,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 21:30:41,089 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 21:30:41,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 21:30:41,089 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:41,089 INFO L422 BasicCegarLoop]: trace histogram [44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:41,089 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 21:30:41,089 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:41,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:41,089 INFO L82 PathProgramCache]: Analyzing trace with hash 1289649022, now seen corresponding path program 44 times [2020-08-21 21:30:41,090 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:41,090 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686457108] [2020-08-21 21:30:41,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:41,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:42,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:42,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:42,647 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:42,647 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686457108] [2020-08-21 21:30:42,648 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:42,648 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 21:30:42,648 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [965615558] [2020-08-21 21:30:42,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 21:30:42,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:42,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 21:30:42,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 21:30:42,649 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 47 states. [2020-08-21 21:30:44,050 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:44,050 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2020-08-21 21:30:44,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 21:30:44,051 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 54 [2020-08-21 21:30:44,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:44,051 INFO L225 Difference]: With dead ends: 61 [2020-08-21 21:30:44,051 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 21:30:44,052 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 [2020-08-21 21:30:44,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 21:30:44,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-08-21 21:30:44,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 21:30:44,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2020-08-21 21:30:44,055 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 54 [2020-08-21 21:30:44,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:44,056 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2020-08-21 21:30:44,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 21:30:44,056 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2020-08-21 21:30:44,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 21:30:44,056 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:44,057 INFO L422 BasicCegarLoop]: trace histogram [45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:44,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 21:30:44,057 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:44,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:44,057 INFO L82 PathProgramCache]: Analyzing trace with hash 1360875281, now seen corresponding path program 45 times [2020-08-21 21:30:44,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:44,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521024132] [2020-08-21 21:30:44,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:44,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:45,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:45,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:45,770 INFO L134 CoverageAnalysis]: Checked inductivity of 1035 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:45,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521024132] [2020-08-21 21:30:45,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:45,770 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 21:30:45,772 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405426476] [2020-08-21 21:30:45,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 21:30:45,773 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:45,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 21:30:45,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 21:30:45,774 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 48 states. [2020-08-21 21:30:47,201 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:47,202 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 21:30:47,202 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 21:30:47,202 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 55 [2020-08-21 21:30:47,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:47,203 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:30:47,204 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 21:30:47,204 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=138, Invalid=2118, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 21:30:47,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 21:30:47,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 21:30:47,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 21:30:47,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 21:30:47,208 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 55 [2020-08-21 21:30:47,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:47,209 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 21:30:47,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 21:30:47,209 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 21:30:47,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 21:30:47,209 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:47,210 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:47,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 21:30:47,210 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:47,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:47,210 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 46 times [2020-08-21 21:30:47,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:47,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987411990] [2020-08-21 21:30:47,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:47,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:48,909 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:48,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:48,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:48,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987411990] [2020-08-21 21:30:48,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:48,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 21:30:48,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246312523] [2020-08-21 21:30:48,922 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 21:30:48,922 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:48,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 21:30:48,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 21:30:48,923 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 49 states. [2020-08-21 21:30:50,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:50,452 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2020-08-21 21:30:50,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 21:30:50,453 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 56 [2020-08-21 21:30:50,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:50,453 INFO L225 Difference]: With dead ends: 63 [2020-08-21 21:30:50,454 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 21:30:50,454 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 21:30:50,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 21:30:50,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-08-21 21:30:50,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 21:30:50,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2020-08-21 21:30:50,459 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 56 [2020-08-21 21:30:50,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:50,459 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2020-08-21 21:30:50,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 21:30:50,459 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2020-08-21 21:30:50,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 21:30:50,459 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:50,460 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:50,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 21:30:50,460 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:50,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:50,460 INFO L82 PathProgramCache]: Analyzing trace with hash -997119823, now seen corresponding path program 47 times [2020-08-21 21:30:50,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:50,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581371538] [2020-08-21 21:30:50,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:50,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:52,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:52,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:52,253 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:52,253 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1581371538] [2020-08-21 21:30:52,253 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:52,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 21:30:52,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130598713] [2020-08-21 21:30:52,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 21:30:52,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:52,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 21:30:52,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=144, Invalid=2306, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 21:30:52,255 INFO L87 Difference]: Start difference. First operand 58 states and 58 transitions. Second operand 50 states.