/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-22 00:44:08,630 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 00:44:08,632 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 00:44:08,657 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 00:44:08,657 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 00:44:08,658 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 00:44:08,660 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 00:44:08,661 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 00:44:08,663 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 00:44:08,664 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 00:44:08,665 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 00:44:08,666 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 00:44:08,666 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 00:44:08,667 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 00:44:08,668 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 00:44:08,669 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 00:44:08,670 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 00:44:08,671 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 00:44:08,675 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 00:44:08,677 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 00:44:08,680 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 00:44:08,683 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 00:44:08,684 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 00:44:08,685 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 00:44:08,691 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-22 00:44:08,699 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 00:44:08,700 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 00:44:08,701 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 00:44:08,702 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-22 00:44:08,752 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 00:44:08,752 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 00:44:08,757 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-22 00:44:08,757 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-22 00:44:08,757 INFO L138 SettingsManager]: * Use SBE=true [2020-08-22 00:44:08,757 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 00:44:08,758 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 00:44:08,758 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 00:44:08,758 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 00:44:08,758 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 00:44:08,758 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 00:44:08,758 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 00:44:08,761 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 00:44:08,761 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 00:44:08,761 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 00:44:08,761 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 00:44:08,761 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 00:44:08,762 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 00:44:08,762 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-22 00:44:08,762 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 00:44:08,762 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 00:44:08,762 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 00:44:08,763 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 00:44:08,763 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-22 00:44:08,763 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-22 00:44:08,763 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-22 00:44:08,763 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-22 00:44:08,763 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 00:44:08,764 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-22 00:44:08,766 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6;log-additional-information=true; [2020-08-22 00:44:09,052 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 00:44:09,064 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 00:44:09,067 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 00:44:09,069 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 00:44:09,069 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 00:44:09,070 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-22 00:44:09,132 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb8242f35/56eb17ff0226430e90bca75cdb20e843/FLAGa442f6a5d [2020-08-22 00:44:09,559 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 00:44:09,560 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-22 00:44:09,566 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb8242f35/56eb17ff0226430e90bca75cdb20e843/FLAGa442f6a5d [2020-08-22 00:44:09,942 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/cb8242f35/56eb17ff0226430e90bca75cdb20e843 [2020-08-22 00:44:09,953 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 00:44:09,955 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 00:44:09,956 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 00:44:09,956 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 00:44:09,960 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 00:44:09,961 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:44:09" (1/1) ... [2020-08-22 00:44:09,964 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@156a129e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:09, skipping insertion in model container [2020-08-22 00:44:09,964 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 12:44:09" (1/1) ... [2020-08-22 00:44:09,972 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 00:44:09,991 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 00:44:10,153 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:44:10,158 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 00:44:10,175 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 00:44:10,190 INFO L208 MainTranslator]: Completed translation [2020-08-22 00:44:10,191 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10 WrapperNode [2020-08-22 00:44:10,191 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 00:44:10,192 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 00:44:10,192 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 00:44:10,192 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 00:44:10,205 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... [2020-08-22 00:44:10,205 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... [2020-08-22 00:44:10,297 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... [2020-08-22 00:44:10,298 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... [2020-08-22 00:44:10,308 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... [2020-08-22 00:44:10,313 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... [2020-08-22 00:44:10,314 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... [2020-08-22 00:44:10,316 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 00:44:10,316 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 00:44:10,317 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 00:44:10,317 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 00:44:10,318 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 00:44:10,380 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 00:44:10,380 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 00:44:10,380 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-22 00:44:10,381 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-22 00:44:10,381 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 00:44:10,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 00:44:10,381 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 00:44:10,381 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-22 00:44:10,381 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-22 00:44:10,382 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 00:44:10,382 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 00:44:10,382 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 00:44:10,382 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 00:44:10,571 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 00:44:10,571 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-22 00:44:10,575 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:44:10 BoogieIcfgContainer [2020-08-22 00:44:10,575 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 00:44:10,576 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 00:44:10,576 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 00:44:10,579 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 00:44:10,580 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 12:44:09" (1/3) ... [2020-08-22 00:44:10,580 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b1e5b47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:44:10, skipping insertion in model container [2020-08-22 00:44:10,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 12:44:10" (2/3) ... [2020-08-22 00:44:10,581 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6b1e5b47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 12:44:10, skipping insertion in model container [2020-08-22 00:44:10,581 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 12:44:10" (3/3) ... [2020-08-22 00:44:10,583 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-22 00:44:10,593 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 00:44:10,600 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 00:44:10,613 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 00:44:10,636 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 00:44:10,636 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 00:44:10,636 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 00:44:10,637 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 00:44:10,637 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 00:44:10,637 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 00:44:10,637 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 00:44:10,637 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 00:44:10,653 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-22 00:44:10,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 00:44:10,659 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:10,660 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:10,660 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:10,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:10,666 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-22 00:44:10,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:10,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1225978339] [2020-08-22 00:44:10,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:10,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:10,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:10,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:10,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:10,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1225978339] [2020-08-22 00:44:10,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:44:10,779 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-22 00:44:10,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1847984061] [2020-08-22 00:44:10,784 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-22 00:44:10,784 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:10,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-22 00:44:10,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 00:44:10,797 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-22 00:44:10,816 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:10,817 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-22 00:44:10,817 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-22 00:44:10,818 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-22 00:44:10,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:10,824 INFO L225 Difference]: With dead ends: 37 [2020-08-22 00:44:10,824 INFO L226 Difference]: Without dead ends: 14 [2020-08-22 00:44:10,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-22 00:44:10,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-22 00:44:10,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-22 00:44:10,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-22 00:44:10,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-22 00:44:10,859 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-22 00:44:10,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:10,860 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-22 00:44:10,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-22 00:44:10,860 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-22 00:44:10,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-22 00:44:10,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:10,861 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:10,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 00:44:10,862 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:10,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:10,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-22 00:44:10,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:10,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [706054988] [2020-08-22 00:44:10,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:10,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:10,904 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:10,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:10,908 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:10,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [706054988] [2020-08-22 00:44:10,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:44:10,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 00:44:10,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070733998] [2020-08-22 00:44:10,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 00:44:10,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:10,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 00:44:10,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 00:44:10,913 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-22 00:44:10,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:10,930 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-22 00:44:10,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 00:44:10,931 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-22 00:44:10,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:10,933 INFO L225 Difference]: With dead ends: 20 [2020-08-22 00:44:10,933 INFO L226 Difference]: Without dead ends: 15 [2020-08-22 00:44:10,934 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 00:44:10,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-22 00:44:10,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-22 00:44:10,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-22 00:44:10,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-22 00:44:10,941 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-22 00:44:10,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:10,941 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-22 00:44:10,941 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 00:44:10,942 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-22 00:44:10,942 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-22 00:44:10,942 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:10,943 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:10,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 00:44:10,943 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:10,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:10,944 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-22 00:44:10,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:10,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208579963] [2020-08-22 00:44:10,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:10,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,012 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:11,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:11,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208579963] [2020-08-22 00:44:11,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:44:11,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-22 00:44:11,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382813820] [2020-08-22 00:44:11,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-22 00:44:11,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:11,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-22 00:44:11,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 00:44:11,022 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-22 00:44:11,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:11,048 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-22 00:44:11,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-22 00:44:11,049 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-22 00:44:11,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:11,050 INFO L225 Difference]: With dead ends: 25 [2020-08-22 00:44:11,050 INFO L226 Difference]: Without dead ends: 16 [2020-08-22 00:44:11,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-22 00:44:11,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-22 00:44:11,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-22 00:44:11,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-22 00:44:11,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-22 00:44:11,069 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-22 00:44:11,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:11,070 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-22 00:44:11,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-22 00:44:11,070 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-22 00:44:11,071 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-22 00:44:11,071 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:11,071 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:11,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 00:44:11,075 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:11,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:11,078 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-22 00:44:11,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:11,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1049446508] [2020-08-22 00:44:11,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:11,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,133 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:11,134 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,138 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:11,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1049446508] [2020-08-22 00:44:11,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:11,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 00:44:11,139 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1204521169] [2020-08-22 00:44:11,140 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 00:44:11,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:11,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 00:44:11,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:44:11,141 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-22 00:44:11,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:11,232 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-22 00:44:11,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 00:44:11,233 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-22 00:44:11,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:11,234 INFO L225 Difference]: With dead ends: 26 [2020-08-22 00:44:11,235 INFO L226 Difference]: Without dead ends: 17 [2020-08-22 00:44:11,235 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-22 00:44:11,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-22 00:44:11,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-22 00:44:11,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-22 00:44:11,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-22 00:44:11,242 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-22 00:44:11,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:11,242 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-22 00:44:11,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 00:44:11,243 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-22 00:44:11,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-22 00:44:11,244 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:11,244 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:11,244 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 00:44:11,244 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:11,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:11,245 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-22 00:44:11,245 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:11,246 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [851094052] [2020-08-22 00:44:11,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:11,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:11,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,307 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:11,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [851094052] [2020-08-22 00:44:11,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:11,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 00:44:11,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599075518] [2020-08-22 00:44:11,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 00:44:11,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:11,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 00:44:11,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:44:11,310 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-22 00:44:11,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:11,403 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-22 00:44:11,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 00:44:11,404 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-22 00:44:11,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:11,404 INFO L225 Difference]: With dead ends: 27 [2020-08-22 00:44:11,405 INFO L226 Difference]: Without dead ends: 18 [2020-08-22 00:44:11,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-22 00:44:11,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-22 00:44:11,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-22 00:44:11,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-22 00:44:11,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-22 00:44:11,414 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-22 00:44:11,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:11,415 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-22 00:44:11,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 00:44:11,415 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-22 00:44:11,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-22 00:44:11,417 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:11,417 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:11,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 00:44:11,418 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:11,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:11,418 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-22 00:44:11,418 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:11,419 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889579756] [2020-08-22 00:44:11,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:11,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,551 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:11,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889579756] [2020-08-22 00:44:11,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:11,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-22 00:44:11,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639645658] [2020-08-22 00:44:11,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 00:44:11,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:11,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 00:44:11,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-22 00:44:11,559 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-22 00:44:11,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:11,696 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-22 00:44:11,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-22 00:44:11,697 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-22 00:44:11,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:11,698 INFO L225 Difference]: With dead ends: 28 [2020-08-22 00:44:11,698 INFO L226 Difference]: Without dead ends: 19 [2020-08-22 00:44:11,699 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-22 00:44:11,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-22 00:44:11,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-22 00:44:11,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-22 00:44:11,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-22 00:44:11,705 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-22 00:44:11,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:11,706 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-22 00:44:11,706 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 00:44:11,706 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-22 00:44:11,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-22 00:44:11,707 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:11,707 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:11,708 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 00:44:11,708 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:11,708 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:11,708 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-22 00:44:11,709 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:11,709 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182749488] [2020-08-22 00:44:11,709 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:11,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:11,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:11,821 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:11,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182749488] [2020-08-22 00:44:11,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:11,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 00:44:11,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280247557] [2020-08-22 00:44:11,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 00:44:11,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:11,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 00:44:11,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 00:44:11,824 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-22 00:44:11,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:11,950 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-22 00:44:11,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 00:44:11,951 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-22 00:44:11,951 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:11,951 INFO L225 Difference]: With dead ends: 29 [2020-08-22 00:44:11,952 INFO L226 Difference]: Without dead ends: 20 [2020-08-22 00:44:11,952 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-22 00:44:11,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-22 00:44:11,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-22 00:44:11,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-22 00:44:11,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-22 00:44:11,958 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-22 00:44:11,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:11,958 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-22 00:44:11,958 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 00:44:11,958 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-22 00:44:11,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-22 00:44:11,959 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:11,959 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:11,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 00:44:11,960 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:11,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:11,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-22 00:44:11,960 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:11,961 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970528846] [2020-08-22 00:44:11,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:11,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,044 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,047 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 00:44:12,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970528846] [2020-08-22 00:44:12,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 00:44:12,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [31548288] [2020-08-22 00:44:12,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 00:44:12,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 00:44:12,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-22 00:44:12,049 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-22 00:44:12,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:12,184 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-22 00:44:12,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 00:44:12,184 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-22 00:44:12,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:12,185 INFO L225 Difference]: With dead ends: 30 [2020-08-22 00:44:12,185 INFO L226 Difference]: Without dead ends: 21 [2020-08-22 00:44:12,186 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-22 00:44:12,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-22 00:44:12,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-22 00:44:12,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-22 00:44:12,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-22 00:44:12,191 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-22 00:44:12,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:12,191 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-22 00:44:12,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 00:44:12,192 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-22 00:44:12,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-22 00:44:12,192 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:12,193 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:12,193 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 00:44:12,193 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:12,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:12,193 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-22 00:44:12,194 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:12,194 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1932047463] [2020-08-22 00:44:12,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:12,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,224 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:12,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1932047463] [2020-08-22 00:44:12,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-22 00:44:12,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809036365] [2020-08-22 00:44:12,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 00:44:12,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 00:44:12,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:44:12,226 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-22 00:44:12,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:12,241 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-22 00:44:12,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 00:44:12,242 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-22 00:44:12,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:12,243 INFO L225 Difference]: With dead ends: 30 [2020-08-22 00:44:12,243 INFO L226 Difference]: Without dead ends: 25 [2020-08-22 00:44:12,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-22 00:44:12,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-22 00:44:12,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-22 00:44:12,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-22 00:44:12,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-22 00:44:12,249 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-22 00:44:12,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:12,250 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-22 00:44:12,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 00:44:12,250 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-22 00:44:12,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-22 00:44:12,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:12,251 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:12,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 00:44:12,252 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:12,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:12,252 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-22 00:44:12,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:12,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622718646] [2020-08-22 00:44:12,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:12,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,295 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:12,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622718646] [2020-08-22 00:44:12,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,296 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-22 00:44:12,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278879554] [2020-08-22 00:44:12,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 00:44:12,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 00:44:12,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:44:12,297 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-22 00:44:12,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:12,317 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-22 00:44:12,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 00:44:12,318 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-22 00:44:12,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:12,319 INFO L225 Difference]: With dead ends: 34 [2020-08-22 00:44:12,319 INFO L226 Difference]: Without dead ends: 29 [2020-08-22 00:44:12,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:44:12,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-22 00:44:12,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-22 00:44:12,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-22 00:44:12,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-22 00:44:12,325 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-22 00:44:12,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:12,326 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-22 00:44:12,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 00:44:12,326 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-22 00:44:12,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-22 00:44:12,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:12,327 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:12,327 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 00:44:12,327 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:12,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:12,328 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-22 00:44:12,328 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:12,328 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [394698428] [2020-08-22 00:44:12,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:12,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,394 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,397 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:12,397 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [394698428] [2020-08-22 00:44:12,398 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-22 00:44:12,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1163214715] [2020-08-22 00:44:12,398 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 00:44:12,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 00:44:12,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:44:12,399 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-22 00:44:12,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:12,423 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-22 00:44:12,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-22 00:44:12,424 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-22 00:44:12,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:12,425 INFO L225 Difference]: With dead ends: 38 [2020-08-22 00:44:12,425 INFO L226 Difference]: Without dead ends: 33 [2020-08-22 00:44:12,426 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:44:12,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-22 00:44:12,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-22 00:44:12,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-22 00:44:12,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-22 00:44:12,432 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-22 00:44:12,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:12,433 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-22 00:44:12,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 00:44:12,433 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-22 00:44:12,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-22 00:44:12,434 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:12,434 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:12,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 00:44:12,434 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:12,435 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:12,435 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-22 00:44:12,435 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:12,436 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1651101116] [2020-08-22 00:44:12,436 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:12,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,553 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,558 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:12,558 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1651101116] [2020-08-22 00:44:12,559 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,559 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-22 00:44:12,559 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451787729] [2020-08-22 00:44:12,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-22 00:44:12,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,561 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-22 00:44:12,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-22 00:44:12,562 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-22 00:44:12,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:12,768 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-22 00:44:12,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-22 00:44:12,769 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-22 00:44:12,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:12,769 INFO L225 Difference]: With dead ends: 54 [2020-08-22 00:44:12,770 INFO L226 Difference]: Without dead ends: 34 [2020-08-22 00:44:12,770 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-22 00:44:12,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-22 00:44:12,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-22 00:44:12,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-22 00:44:12,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-22 00:44:12,778 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-22 00:44:12,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:12,779 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-22 00:44:12,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-22 00:44:12,779 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-22 00:44:12,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 00:44:12,780 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:12,780 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:12,781 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 00:44:12,781 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:12,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:12,781 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-22 00:44:12,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:12,782 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1771973589] [2020-08-22 00:44:12,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:12,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:12,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:12,925 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:12,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1771973589] [2020-08-22 00:44:12,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:12,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 00:44:12,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328556092] [2020-08-22 00:44:12,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 00:44:12,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:12,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 00:44:12,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-22 00:44:12,928 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-22 00:44:13,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:13,148 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-22 00:44:13,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-22 00:44:13,148 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-22 00:44:13,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:13,149 INFO L225 Difference]: With dead ends: 55 [2020-08-22 00:44:13,149 INFO L226 Difference]: Without dead ends: 35 [2020-08-22 00:44:13,150 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-22 00:44:13,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-22 00:44:13,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-22 00:44:13,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-22 00:44:13,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-22 00:44:13,157 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-22 00:44:13,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:13,157 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-22 00:44:13,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 00:44:13,157 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-22 00:44:13,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-22 00:44:13,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:13,158 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:13,158 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 00:44:13,159 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:13,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:13,159 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-22 00:44:13,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:13,159 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1527315207] [2020-08-22 00:44:13,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:13,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:13,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:13,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:13,274 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:13,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1527315207] [2020-08-22 00:44:13,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:13,275 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 00:44:13,275 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567655402] [2020-08-22 00:44:13,276 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 00:44:13,276 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:13,276 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 00:44:13,277 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-22 00:44:13,277 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-22 00:44:13,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:13,546 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-22 00:44:13,546 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 00:44:13,546 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-22 00:44:13,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:13,547 INFO L225 Difference]: With dead ends: 56 [2020-08-22 00:44:13,547 INFO L226 Difference]: Without dead ends: 36 [2020-08-22 00:44:13,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-22 00:44:13,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-22 00:44:13,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-22 00:44:13,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-22 00:44:13,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-22 00:44:13,561 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-22 00:44:13,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:13,561 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-22 00:44:13,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 00:44:13,562 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-22 00:44:13,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 00:44:13,563 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:13,563 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:13,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-22 00:44:13,564 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:13,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:13,564 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-22 00:44:13,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:13,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451934061] [2020-08-22 00:44:13,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:13,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:13,739 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:13,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:13,744 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:13,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451934061] [2020-08-22 00:44:13,745 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:13,745 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 00:44:13,745 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [872421796] [2020-08-22 00:44:13,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 00:44:13,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:13,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 00:44:13,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-22 00:44:13,747 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-22 00:44:14,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:14,057 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-22 00:44:14,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 00:44:14,058 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-22 00:44:14,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:14,059 INFO L225 Difference]: With dead ends: 57 [2020-08-22 00:44:14,059 INFO L226 Difference]: Without dead ends: 37 [2020-08-22 00:44:14,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-22 00:44:14,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-22 00:44:14,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-22 00:44:14,069 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-22 00:44:14,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-22 00:44:14,069 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-22 00:44:14,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:14,070 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-22 00:44:14,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 00:44:14,070 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-22 00:44:14,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-22 00:44:14,071 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:14,071 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:14,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-22 00:44:14,071 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:14,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:14,072 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-22 00:44:14,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:14,072 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257162642] [2020-08-22 00:44:14,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:14,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:14,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:14,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:14,208 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:14,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257162642] [2020-08-22 00:44:14,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:14,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-22 00:44:14,209 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982305539] [2020-08-22 00:44:14,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-22 00:44:14,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:14,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-22 00:44:14,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-22 00:44:14,210 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-22 00:44:14,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:14,608 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-22 00:44:14,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-22 00:44:14,608 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-22 00:44:14,609 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:14,610 INFO L225 Difference]: With dead ends: 58 [2020-08-22 00:44:14,611 INFO L226 Difference]: Without dead ends: 38 [2020-08-22 00:44:14,612 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-22 00:44:14,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-22 00:44:14,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-22 00:44:14,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-22 00:44:14,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-22 00:44:14,634 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-22 00:44:14,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:14,636 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-22 00:44:14,636 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-22 00:44:14,636 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-22 00:44:14,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-22 00:44:14,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:14,637 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:14,637 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-22 00:44:14,637 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:14,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:14,641 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-22 00:44:14,641 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:14,642 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1110062089] [2020-08-22 00:44:14,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:14,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:14,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:14,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:14,824 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:14,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1110062089] [2020-08-22 00:44:14,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:14,825 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-22 00:44:14,825 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198188098] [2020-08-22 00:44:14,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-22 00:44:14,826 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:14,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-22 00:44:14,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-22 00:44:14,826 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-22 00:44:15,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:15,214 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-22 00:44:15,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 00:44:15,214 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-22 00:44:15,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:15,215 INFO L225 Difference]: With dead ends: 59 [2020-08-22 00:44:15,216 INFO L226 Difference]: Without dead ends: 39 [2020-08-22 00:44:15,217 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-22 00:44:15,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-22 00:44:15,223 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-22 00:44:15,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-22 00:44:15,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-22 00:44:15,224 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-22 00:44:15,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:15,224 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-22 00:44:15,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-22 00:44:15,225 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-22 00:44:15,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-22 00:44:15,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:15,225 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:15,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-22 00:44:15,226 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:15,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:15,226 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-22 00:44:15,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:15,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814473021] [2020-08-22 00:44:15,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:15,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:15,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:15,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:15,418 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:15,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814473021] [2020-08-22 00:44:15,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:15,418 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-22 00:44:15,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [388488539] [2020-08-22 00:44:15,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-22 00:44:15,419 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:15,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-22 00:44:15,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-22 00:44:15,420 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-22 00:44:15,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:15,883 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-22 00:44:15,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 00:44:15,885 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-22 00:44:15,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:15,886 INFO L225 Difference]: With dead ends: 60 [2020-08-22 00:44:15,886 INFO L226 Difference]: Without dead ends: 40 [2020-08-22 00:44:15,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-22 00:44:15,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-22 00:44:15,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-22 00:44:15,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-22 00:44:15,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-22 00:44:15,893 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-22 00:44:15,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:15,894 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-22 00:44:15,894 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-22 00:44:15,894 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-22 00:44:15,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-22 00:44:15,895 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:15,895 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:15,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-22 00:44:15,895 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:15,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:15,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-22 00:44:15,896 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:15,896 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895335286] [2020-08-22 00:44:15,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:15,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,118 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:16,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,127 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:16,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895335286] [2020-08-22 00:44:16,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:16,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 00:44:16,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [560214257] [2020-08-22 00:44:16,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 00:44:16,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:16,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 00:44:16,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-22 00:44:16,130 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-22 00:44:16,661 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:16,661 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-22 00:44:16,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-22 00:44:16,662 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-22 00:44:16,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:16,663 INFO L225 Difference]: With dead ends: 61 [2020-08-22 00:44:16,663 INFO L226 Difference]: Without dead ends: 41 [2020-08-22 00:44:16,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-22 00:44:16,664 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-22 00:44:16,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-22 00:44:16,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-22 00:44:16,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-22 00:44:16,672 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-22 00:44:16,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:16,672 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-22 00:44:16,672 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 00:44:16,672 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-22 00:44:16,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-22 00:44:16,673 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:16,673 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:16,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-22 00:44:16,674 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:16,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:16,674 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-22 00:44:16,674 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:16,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493663509] [2020-08-22 00:44:16,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:16,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:16,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:16,892 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:16,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493663509] [2020-08-22 00:44:16,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:16,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-22 00:44:16,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43128095] [2020-08-22 00:44:16,893 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-22 00:44:16,893 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:16,894 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-22 00:44:16,894 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-22 00:44:16,894 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-22 00:44:17,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:17,478 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-22 00:44:17,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-22 00:44:17,478 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-22 00:44:17,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:17,479 INFO L225 Difference]: With dead ends: 62 [2020-08-22 00:44:17,479 INFO L226 Difference]: Without dead ends: 42 [2020-08-22 00:44:17,480 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 00:44:17,481 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-22 00:44:17,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-22 00:44:17,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-22 00:44:17,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-22 00:44:17,487 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-22 00:44:17,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:17,487 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-22 00:44:17,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-22 00:44:17,487 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-22 00:44:17,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-22 00:44:17,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:17,488 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:17,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-22 00:44:17,488 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:17,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:17,489 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-22 00:44:17,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:17,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196905188] [2020-08-22 00:44:17,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:17,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:17,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:17,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:17,731 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:17,731 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196905188] [2020-08-22 00:44:17,731 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:17,731 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-22 00:44:17,732 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292532967] [2020-08-22 00:44:17,732 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-22 00:44:17,732 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:17,732 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-22 00:44:17,733 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-22 00:44:17,733 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-22 00:44:18,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:18,416 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-22 00:44:18,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 00:44:18,417 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-22 00:44:18,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:18,418 INFO L225 Difference]: With dead ends: 63 [2020-08-22 00:44:18,418 INFO L226 Difference]: Without dead ends: 43 [2020-08-22 00:44:18,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-22 00:44:18,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-22 00:44:18,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-22 00:44:18,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-22 00:44:18,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-22 00:44:18,425 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-22 00:44:18,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:18,426 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-22 00:44:18,426 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-22 00:44:18,426 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-22 00:44:18,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-22 00:44:18,426 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:18,426 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:18,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-22 00:44:18,427 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:18,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:18,427 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-22 00:44:18,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:18,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [744270386] [2020-08-22 00:44:18,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:18,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:18,694 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:18,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:18,701 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:18,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [744270386] [2020-08-22 00:44:18,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:18,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-22 00:44:18,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [973509576] [2020-08-22 00:44:18,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-22 00:44:18,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:18,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-22 00:44:18,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-22 00:44:18,704 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-22 00:44:19,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:19,431 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-22 00:44:19,433 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-22 00:44:19,434 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-22 00:44:19,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:19,434 INFO L225 Difference]: With dead ends: 64 [2020-08-22 00:44:19,434 INFO L226 Difference]: Without dead ends: 44 [2020-08-22 00:44:19,435 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-22 00:44:19,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-22 00:44:19,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-22 00:44:19,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-22 00:44:19,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-22 00:44:19,442 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-22 00:44:19,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:19,443 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-22 00:44:19,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-22 00:44:19,443 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-22 00:44:19,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 00:44:19,443 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:19,444 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:19,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-22 00:44:19,444 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:19,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:19,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-22 00:44:19,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:19,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465494931] [2020-08-22 00:44:19,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:19,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:19,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:19,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:19,747 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:19,747 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465494931] [2020-08-22 00:44:19,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:19,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-22 00:44:19,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755655210] [2020-08-22 00:44:19,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-22 00:44:19,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:19,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-22 00:44:19,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-22 00:44:19,749 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-22 00:44:20,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:20,559 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-22 00:44:20,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-22 00:44:20,559 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-22 00:44:20,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:20,560 INFO L225 Difference]: With dead ends: 65 [2020-08-22 00:44:20,561 INFO L226 Difference]: Without dead ends: 45 [2020-08-22 00:44:20,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-22 00:44:20,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-22 00:44:20,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-22 00:44:20,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-22 00:44:20,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-22 00:44:20,569 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-22 00:44:20,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:20,569 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-22 00:44:20,569 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-22 00:44:20,569 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-22 00:44:20,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 00:44:20,570 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:20,570 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:20,570 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-22 00:44:20,570 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:20,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:20,571 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-22 00:44:20,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:20,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692365550] [2020-08-22 00:44:20,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:20,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:20,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:20,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:20,904 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:20,904 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692365550] [2020-08-22 00:44:20,904 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:20,905 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-22 00:44:20,905 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526257601] [2020-08-22 00:44:20,905 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-22 00:44:20,905 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:20,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-22 00:44:20,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-22 00:44:20,906 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-22 00:44:21,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:21,771 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-22 00:44:21,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 00:44:21,772 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-22 00:44:21,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:21,773 INFO L225 Difference]: With dead ends: 66 [2020-08-22 00:44:21,773 INFO L226 Difference]: Without dead ends: 46 [2020-08-22 00:44:21,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-22 00:44:21,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-22 00:44:21,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-22 00:44:21,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-22 00:44:21,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-22 00:44:21,781 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-22 00:44:21,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:21,782 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-22 00:44:21,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-22 00:44:21,782 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-22 00:44:21,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 00:44:21,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:21,783 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:21,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-22 00:44:21,787 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:21,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:21,787 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-22 00:44:21,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:21,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [159155598] [2020-08-22 00:44:21,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:21,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:22,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:22,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:22,174 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:22,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [159155598] [2020-08-22 00:44:22,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:22,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-22 00:44:22,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055270658] [2020-08-22 00:44:22,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-22 00:44:22,175 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:22,176 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-22 00:44:22,176 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-22 00:44:22,176 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-22 00:44:23,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:23,185 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-22 00:44:23,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-22 00:44:23,186 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-22 00:44:23,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:23,186 INFO L225 Difference]: With dead ends: 67 [2020-08-22 00:44:23,187 INFO L226 Difference]: Without dead ends: 47 [2020-08-22 00:44:23,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-22 00:44:23,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-22 00:44:23,196 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-22 00:44:23,196 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-22 00:44:23,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-22 00:44:23,197 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-22 00:44:23,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:23,197 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-22 00:44:23,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-22 00:44:23,198 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-22 00:44:23,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-22 00:44:23,198 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:23,198 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:23,199 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-22 00:44:23,199 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:23,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:23,199 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-22 00:44:23,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:23,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [983668423] [2020-08-22 00:44:23,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:23,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:23,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:23,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:23,593 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:23,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [983668423] [2020-08-22 00:44:23,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:23,594 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-22 00:44:23,594 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133174513] [2020-08-22 00:44:23,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-22 00:44:23,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:23,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-22 00:44:23,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-22 00:44:23,595 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-22 00:44:24,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:24,740 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-22 00:44:24,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-22 00:44:24,741 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-22 00:44:24,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:24,742 INFO L225 Difference]: With dead ends: 68 [2020-08-22 00:44:24,742 INFO L226 Difference]: Without dead ends: 48 [2020-08-22 00:44:24,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-22 00:44:24,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-22 00:44:24,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-22 00:44:24,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-22 00:44:24,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-22 00:44:24,750 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-22 00:44:24,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:24,750 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-22 00:44:24,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-22 00:44:24,750 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-22 00:44:24,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-22 00:44:24,750 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:24,750 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:24,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-22 00:44:24,751 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:24,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:24,751 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-22 00:44:24,751 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:24,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641022917] [2020-08-22 00:44:24,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:24,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:25,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:25,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:25,191 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-22 00:44:25,191 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641022917] [2020-08-22 00:44:25,192 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 00:44:25,192 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-22 00:44:25,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [601575167] [2020-08-22 00:44:25,193 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-22 00:44:25,193 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:25,193 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-22 00:44:25,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-22 00:44:25,197 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-22 00:44:26,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:26,419 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-22 00:44:26,420 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-22 00:44:26,420 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-22 00:44:26,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:26,421 INFO L225 Difference]: With dead ends: 69 [2020-08-22 00:44:26,421 INFO L226 Difference]: Without dead ends: 49 [2020-08-22 00:44:26,423 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-22 00:44:26,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-22 00:44:26,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-22 00:44:26,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-22 00:44:26,430 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-22 00:44:26,430 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-22 00:44:26,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:26,431 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-22 00:44:26,431 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-22 00:44:26,431 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-22 00:44:26,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-22 00:44:26,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 00:44:26,431 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 00:44:26,431 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-22 00:44:26,432 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 00:44:26,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 00:44:26,432 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-22 00:44:26,432 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 00:44:26,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611201478] [2020-08-22 00:44:26,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 00:44:26,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:26,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 00:44:26,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 00:44:26,487 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-22 00:44:26,487 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611201478] [2020-08-22 00:44:26,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 00:44:26,488 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-22 00:44:26,488 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913658383] [2020-08-22 00:44:26,488 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-22 00:44:26,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 00:44:26,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-22 00:44:26,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-22 00:44:26,489 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-22 00:44:26,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 00:44:26,515 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-22 00:44:26,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-22 00:44:26,515 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-22 00:44:26,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 00:44:26,515 INFO L225 Difference]: With dead ends: 66 [2020-08-22 00:44:26,516 INFO L226 Difference]: Without dead ends: 0 [2020-08-22 00:44:26,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-22 00:44:26,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-22 00:44:26,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-22 00:44:26,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-22 00:44:26,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-22 00:44:26,517 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-22 00:44:26,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 00:44:26,517 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-22 00:44:26,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-22 00:44:26,517 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-22 00:44:26,518 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-22 00:44:26,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-22 00:44:26,520 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-22 00:44:26,761 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-22 00:44:26,762 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-22 00:44:26,762 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-22 00:44:26,762 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-22 00:44:26,762 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-22 00:44:26,762 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-22 00:44:26,762 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-22 00:44:26,762 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-22 00:44:26,762 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-22 00:44:26,763 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-22 00:44:26,763 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-22 00:44:26,763 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-22 00:44:26,763 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-22 00:44:26,763 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-22 00:44:26,763 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-22 00:44:26,763 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-22 00:44:26,764 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-22 00:44:26,764 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-22 00:44:26,764 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-22 00:44:26,764 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-22 00:44:26,764 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-22 00:44:26,764 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-22 00:44:26,764 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-22 00:44:26,764 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-22 00:44:26,765 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-22 00:44:26,787 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 12:44:26 BoogieIcfgContainer [2020-08-22 00:44:26,787 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 00:44:26,790 INFO L168 Benchmark]: Toolchain (without parser) took 16835.15 ms. Allocated memory was 146.3 MB in the beginning and 354.4 MB in the end (delta: 208.1 MB). Free memory was 102.3 MB in the beginning and 240.5 MB in the end (delta: -138.2 MB). Peak memory consumption was 69.9 MB. Max. memory is 7.1 GB. [2020-08-22 00:44:26,790 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 146.3 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-22 00:44:26,791 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.44 ms. Allocated memory is still 146.3 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. [2020-08-22 00:44:26,791 INFO L168 Benchmark]: Boogie Preprocessor took 124.41 ms. Allocated memory was 146.3 MB in the beginning and 202.9 MB in the end (delta: 56.6 MB). Free memory was 92.6 MB in the beginning and 181.5 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-08-22 00:44:26,792 INFO L168 Benchmark]: RCFGBuilder took 258.80 ms. Allocated memory is still 202.9 MB. Free memory was 180.9 MB in the beginning and 168.7 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. [2020-08-22 00:44:26,792 INFO L168 Benchmark]: TraceAbstraction took 16211.39 ms. Allocated memory was 202.9 MB in the beginning and 354.4 MB in the end (delta: 151.5 MB). Free memory was 168.0 MB in the beginning and 240.5 MB in the end (delta: -72.5 MB). Peak memory consumption was 79.1 MB. Max. memory is 7.1 GB. [2020-08-22 00:44:26,795 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 146.3 MB. Free memory was 120.7 MB in the beginning and 120.5 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 235.44 ms. Allocated memory is still 146.3 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.5 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 124.41 ms. Allocated memory was 146.3 MB in the beginning and 202.9 MB in the end (delta: 56.6 MB). Free memory was 92.6 MB in the beginning and 181.5 MB in the end (delta: -89.0 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * RCFGBuilder took 258.80 ms. Allocated memory is still 202.9 MB. Free memory was 180.9 MB in the beginning and 168.7 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 16211.39 ms. Allocated memory was 202.9 MB in the beginning and 354.4 MB in the end (delta: 151.5 MB). Free memory was 168.0 MB in the beginning and 240.5 MB in the end (delta: -72.5 MB). Peak memory consumption was 79.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.8s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 12.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.2s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...