/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/ldv-regression/test25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:56:03,295 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:56:03,297 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:56:03,321 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:56:03,321 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:56:03,322 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:56:03,323 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:56:03,325 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:56:03,327 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:56:03,328 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:56:03,329 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:56:03,330 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:56:03,330 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:56:03,331 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:56:03,332 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:56:03,333 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:56:03,334 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:56:03,335 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:56:03,337 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:56:03,338 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:56:03,340 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:56:03,341 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:56:03,342 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:56:03,343 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:56:03,345 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:56:03,353 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:56:03,354 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:56:03,354 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:56:03,355 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 [2020-08-18 21:56:03,379 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:56:03,379 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:56:03,380 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:56:03,381 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:56:03,381 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:56:03,381 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:56:03,381 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:56:03,381 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:56:03,382 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:56:03,382 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:56:03,382 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:56:03,382 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:56:03,382 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:56:03,383 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:56:03,383 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:56:03,383 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:56:03,383 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:56:03,383 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:56:03,384 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:56:03,384 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:56:03,384 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:56:03,384 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:56:03,384 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:56:03,385 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:56:03,385 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:56:03,385 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:56:03,385 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:56:03,385 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:56:03,386 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:56:03,386 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=NARROWEST; [2020-08-18 21:56:03,700 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:56:03,720 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:56:03,725 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:56:03,728 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:56:03,728 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:56:03,729 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 21:56:03,795 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d3812f6ba/af5cbbe9ec45425fbe5b846e8ac1ecb5/FLAG1448ee273 [2020-08-18 21:56:04,261 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:56:04,262 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/ldv-regression/test25-2.c [2020-08-18 21:56:04,268 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d3812f6ba/af5cbbe9ec45425fbe5b846e8ac1ecb5/FLAG1448ee273 [2020-08-18 21:56:04,591 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d3812f6ba/af5cbbe9ec45425fbe5b846e8ac1ecb5 [2020-08-18 21:56:04,601 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:56:04,603 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:56:04,604 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:56:04,604 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:56:04,608 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:56:04,609 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,612 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e2f0c5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04, skipping insertion in model container [2020-08-18 21:56:04,612 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,619 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:56:04,638 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:56:04,834 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:56:04,843 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:56:04,866 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:56:04,955 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:56:04,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04 WrapperNode [2020-08-18 21:56:04,956 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:56:04,957 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:56:04,957 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:56:04,957 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:56:04,967 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,967 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,975 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,976 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,984 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,989 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,990 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... [2020-08-18 21:56:04,993 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:56:04,993 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:56:04,994 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:56:04,994 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:56:04,997 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:56:05,059 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:56:05,059 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:56:05,059 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2020-08-18 21:56:05,059 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:56:05,060 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:56:05,060 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-18 21:56:05,060 INFO L130 BoogieDeclarations]: Found specification of procedure check [2020-08-18 21:56:05,060 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 21:56:05,060 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 21:56:05,060 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:56:05,061 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 21:56:05,061 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 21:56:05,061 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 21:56:05,061 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 21:56:05,061 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:56:05,061 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:56:05,338 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:56:05,339 INFO L295 CfgBuilder]: Removed 2 assume(true) statements. [2020-08-18 21:56:05,344 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:56:05 BoogieIcfgContainer [2020-08-18 21:56:05,345 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:56:05,346 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:56:05,347 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:56:05,350 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:56:05,350 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:56:04" (1/3) ... [2020-08-18 21:56:05,351 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3946e17f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:56:05, skipping insertion in model container [2020-08-18 21:56:05,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:56:04" (2/3) ... [2020-08-18 21:56:05,352 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3946e17f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:56:05, skipping insertion in model container [2020-08-18 21:56:05,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:56:05" (3/3) ... [2020-08-18 21:56:05,354 INFO L109 eAbstractionObserver]: Analyzing ICFG test25-2.c [2020-08-18 21:56:05,368 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:56:05,378 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:56:05,405 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:56:05,445 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:56:05,446 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:56:05,446 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:56:05,446 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:56:05,446 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:56:05,446 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:56:05,446 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:56:05,447 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:56:05,467 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2020-08-18 21:56:05,480 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-18 21:56:05,480 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:05,481 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:05,482 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:05,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:05,489 INFO L82 PathProgramCache]: Analyzing trace with hash -899836778, now seen corresponding path program 1 times [2020-08-18 21:56:05,497 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:05,498 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [214668209] [2020-08-18 21:56:05,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:05,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:05,698 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:05,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:05,721 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-18 21:56:05,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:05,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:05,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [214668209] [2020-08-18 21:56:05,757 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:56:05,758 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 21:56:05,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410649562] [2020-08-18 21:56:05,763 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 21:56:05,764 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:05,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 21:56:05,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:56:05,777 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2020-08-18 21:56:05,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:05,864 INFO L93 Difference]: Finished difference Result 42 states and 52 transitions. [2020-08-18 21:56:05,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 21:56:05,866 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2020-08-18 21:56:05,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:05,876 INFO L225 Difference]: With dead ends: 42 [2020-08-18 21:56:05,876 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 21:56:05,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:56:05,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 21:56:05,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-18 21:56:05,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-18 21:56:05,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-08-18 21:56:05,915 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 17 [2020-08-18 21:56:05,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:05,915 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-08-18 21:56:05,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 21:56:05,916 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-08-18 21:56:05,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 21:56:05,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:05,917 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:05,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:56:05,918 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:05,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:05,918 INFO L82 PathProgramCache]: Analyzing trace with hash -1137678901, now seen corresponding path program 1 times [2020-08-18 21:56:05,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:05,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1639530571] [2020-08-18 21:56:05,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:05,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:05,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:06,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2020-08-18 21:56:06,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:06,030 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1639530571] [2020-08-18 21:56:06,030 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:56:06,035 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 21:56:06,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067898776] [2020-08-18 21:56:06,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:56:06,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:06,039 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:56:06,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:56:06,040 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 4 states. [2020-08-18 21:56:06,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:06,135 INFO L93 Difference]: Finished difference Result 34 states and 36 transitions. [2020-08-18 21:56:06,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:56:06,136 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-08-18 21:56:06,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:06,137 INFO L225 Difference]: With dead ends: 34 [2020-08-18 21:56:06,138 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 21:56:06,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:56:06,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 21:56:06,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 21:56:06,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:56:06,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-18 21:56:06,146 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 18 [2020-08-18 21:56:06,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:06,146 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-18 21:56:06,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:56:06,147 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-18 21:56:06,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:56:06,148 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:06,148 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:06,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:56:06,149 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:06,149 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:06,149 INFO L82 PathProgramCache]: Analyzing trace with hash 278779309, now seen corresponding path program 1 times [2020-08-18 21:56:06,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:06,150 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [469396494] [2020-08-18 21:56:06,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:06,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:06,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-18 21:56:06,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,236 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:06,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [469396494] [2020-08-18 21:56:06,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:06,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 21:56:06,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821309661] [2020-08-18 21:56:06,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:56:06,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:06,238 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:56:06,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:56:06,238 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 5 states. [2020-08-18 21:56:06,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:06,311 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-08-18 21:56:06,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:56:06,312 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 20 [2020-08-18 21:56:06,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:06,313 INFO L225 Difference]: With dead ends: 36 [2020-08-18 21:56:06,313 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 21:56:06,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:56:06,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 21:56:06,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 21:56:06,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 21:56:06,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2020-08-18 21:56:06,321 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 20 [2020-08-18 21:56:06,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:06,321 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2020-08-18 21:56:06,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:56:06,322 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2020-08-18 21:56:06,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:56:06,323 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:06,323 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:06,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:56:06,324 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:06,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:06,324 INFO L82 PathProgramCache]: Analyzing trace with hash -9513713, now seen corresponding path program 2 times [2020-08-18 21:56:06,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:06,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [100518698] [2020-08-18 21:56:06,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:06,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:06,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,456 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-18 21:56:06,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,463 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:06,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [100518698] [2020-08-18 21:56:06,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:06,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:56:06,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [49875242] [2020-08-18 21:56:06,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:56:06,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:06,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:56:06,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:56:06,466 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand 6 states. [2020-08-18 21:56:06,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:06,549 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2020-08-18 21:56:06,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:56:06,550 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2020-08-18 21:56:06,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:06,552 INFO L225 Difference]: With dead ends: 38 [2020-08-18 21:56:06,552 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 21:56:06,553 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:56:06,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 21:56:06,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 21:56:06,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 21:56:06,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2020-08-18 21:56:06,573 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 22 [2020-08-18 21:56:06,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:06,573 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2020-08-18 21:56:06,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:56:06,574 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2020-08-18 21:56:06,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 21:56:06,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:06,575 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:06,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:56:06,575 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:06,576 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:06,576 INFO L82 PathProgramCache]: Analyzing trace with hash 2113766385, now seen corresponding path program 3 times [2020-08-18 21:56:06,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:06,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506136170] [2020-08-18 21:56:06,577 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:06,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:06,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2020-08-18 21:56:06,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,664 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:06,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506136170] [2020-08-18 21:56:06,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:06,665 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:56:06,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1411962228] [2020-08-18 21:56:06,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:56:06,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:06,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:56:06,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:56:06,667 INFO L87 Difference]: Start difference. First operand 25 states and 26 transitions. Second operand 7 states. [2020-08-18 21:56:06,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:06,740 INFO L93 Difference]: Finished difference Result 40 states and 42 transitions. [2020-08-18 21:56:06,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:56:06,741 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 24 [2020-08-18 21:56:06,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:06,742 INFO L225 Difference]: With dead ends: 40 [2020-08-18 21:56:06,742 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 21:56:06,743 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:56:06,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 21:56:06,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 21:56:06,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 21:56:06,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-18 21:56:06,749 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 24 [2020-08-18 21:56:06,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:06,750 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-18 21:56:06,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:56:06,750 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-18 21:56:06,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 21:56:06,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:06,751 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:06,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:56:06,752 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:06,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:06,752 INFO L82 PathProgramCache]: Analyzing trace with hash -1818492333, now seen corresponding path program 4 times [2020-08-18 21:56:06,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:06,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786734041] [2020-08-18 21:56:06,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:06,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,866 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:06,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,870 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2020-08-18 21:56:06,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:06,876 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:06,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786734041] [2020-08-18 21:56:06,877 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:06,877 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 21:56:06,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [621299896] [2020-08-18 21:56:06,878 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 21:56:06,878 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:06,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 21:56:06,879 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:56:06,879 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 8 states. [2020-08-18 21:56:06,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:06,955 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-08-18 21:56:06,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:56:06,956 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2020-08-18 21:56:06,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:06,957 INFO L225 Difference]: With dead ends: 42 [2020-08-18 21:56:06,957 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 21:56:06,958 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:56:06,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 21:56:06,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 21:56:06,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 21:56:06,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 30 transitions. [2020-08-18 21:56:06,964 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 30 transitions. Word has length 26 [2020-08-18 21:56:06,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:06,964 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 30 transitions. [2020-08-18 21:56:06,965 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 21:56:06,965 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 30 transitions. [2020-08-18 21:56:06,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 21:56:06,966 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:06,966 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:06,967 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:56:06,967 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:06,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:06,967 INFO L82 PathProgramCache]: Analyzing trace with hash -1147899851, now seen corresponding path program 5 times [2020-08-18 21:56:06,968 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:06,968 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836615116] [2020-08-18 21:56:06,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:06,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:07,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2020-08-18 21:56:07,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,100 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:07,101 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836615116] [2020-08-18 21:56:07,101 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:07,101 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:56:07,101 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135992121] [2020-08-18 21:56:07,102 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:56:07,103 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:07,103 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:56:07,104 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:56:07,104 INFO L87 Difference]: Start difference. First operand 29 states and 30 transitions. Second operand 9 states. [2020-08-18 21:56:07,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:07,214 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2020-08-18 21:56:07,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:56:07,214 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-08-18 21:56:07,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:07,215 INFO L225 Difference]: With dead ends: 44 [2020-08-18 21:56:07,215 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 21:56:07,216 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:56:07,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 21:56:07,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 21:56:07,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 21:56:07,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 32 transitions. [2020-08-18 21:56:07,225 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 32 transitions. Word has length 28 [2020-08-18 21:56:07,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:07,226 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 32 transitions. [2020-08-18 21:56:07,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:56:07,226 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 32 transitions. [2020-08-18 21:56:07,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 21:56:07,229 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:07,229 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:07,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:56:07,230 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:07,230 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:07,230 INFO L82 PathProgramCache]: Analyzing trace with hash -953619049, now seen corresponding path program 6 times [2020-08-18 21:56:07,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:07,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213498929] [2020-08-18 21:56:07,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:07,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:07,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-18 21:56:07,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,399 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:07,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213498929] [2020-08-18 21:56:07,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:07,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 21:56:07,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1992798807] [2020-08-18 21:56:07,401 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 21:56:07,401 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:07,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 21:56:07,402 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:56:07,402 INFO L87 Difference]: Start difference. First operand 31 states and 32 transitions. Second operand 10 states. [2020-08-18 21:56:07,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:07,510 INFO L93 Difference]: Finished difference Result 46 states and 48 transitions. [2020-08-18 21:56:07,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 21:56:07,511 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2020-08-18 21:56:07,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:07,512 INFO L225 Difference]: With dead ends: 46 [2020-08-18 21:56:07,512 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 21:56:07,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:56:07,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 21:56:07,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 21:56:07,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 21:56:07,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-18 21:56:07,524 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 30 [2020-08-18 21:56:07,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:07,528 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-18 21:56:07,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 21:56:07,528 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-18 21:56:07,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 21:56:07,529 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:07,529 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:07,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:56:07,530 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:07,530 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:07,530 INFO L82 PathProgramCache]: Analyzing trace with hash 1066637945, now seen corresponding path program 7 times [2020-08-18 21:56:07,530 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:07,531 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1564036475] [2020-08-18 21:56:07,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:07,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:07,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-18 21:56:07,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,705 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:07,706 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1564036475] [2020-08-18 21:56:07,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:07,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:56:07,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107928721] [2020-08-18 21:56:07,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:56:07,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:07,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:56:07,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:56:07,716 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-18 21:56:07,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:07,823 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 21:56:07,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:56:07,824 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 32 [2020-08-18 21:56:07,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:07,825 INFO L225 Difference]: With dead ends: 48 [2020-08-18 21:56:07,825 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 21:56:07,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:56:07,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 21:56:07,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 21:56:07,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 21:56:07,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 36 transitions. [2020-08-18 21:56:07,831 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 36 transitions. Word has length 32 [2020-08-18 21:56:07,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:07,831 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 36 transitions. [2020-08-18 21:56:07,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:56:07,831 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 36 transitions. [2020-08-18 21:56:07,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 21:56:07,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:07,832 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:07,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:56:07,833 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:07,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:07,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1208391387, now seen corresponding path program 8 times [2020-08-18 21:56:07,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:07,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107834154] [2020-08-18 21:56:07,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:07,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,944 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:07,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 27 [2020-08-18 21:56:07,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:07,950 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:07,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107834154] [2020-08-18 21:56:07,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:07,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:56:07,951 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403933881] [2020-08-18 21:56:07,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:56:07,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:07,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:56:07,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:56:07,953 INFO L87 Difference]: Start difference. First operand 35 states and 36 transitions. Second operand 12 states. [2020-08-18 21:56:08,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:08,028 INFO L93 Difference]: Finished difference Result 50 states and 52 transitions. [2020-08-18 21:56:08,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 21:56:08,028 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-18 21:56:08,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:08,029 INFO L225 Difference]: With dead ends: 50 [2020-08-18 21:56:08,029 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 21:56:08,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:56:08,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 21:56:08,034 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 21:56:08,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 21:56:08,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 38 transitions. [2020-08-18 21:56:08,035 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 38 transitions. Word has length 34 [2020-08-18 21:56:08,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:08,035 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 38 transitions. [2020-08-18 21:56:08,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:56:08,035 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 38 transitions. [2020-08-18 21:56:08,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 21:56:08,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:08,036 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:08,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:56:08,037 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:08,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:08,037 INFO L82 PathProgramCache]: Analyzing trace with hash -5504323, now seen corresponding path program 9 times [2020-08-18 21:56:08,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:08,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093919337] [2020-08-18 21:56:08,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:08,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:08,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:08,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:08,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2020-08-18 21:56:08,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:08,172 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:56:08,172 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093919337] [2020-08-18 21:56:08,172 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:08,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:56:08,173 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257319257] [2020-08-18 21:56:08,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:56:08,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:08,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:56:08,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:56:08,174 INFO L87 Difference]: Start difference. First operand 37 states and 38 transitions. Second operand 13 states. [2020-08-18 21:56:08,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:08,270 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2020-08-18 21:56:08,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:56:08,270 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 36 [2020-08-18 21:56:08,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:08,271 INFO L225 Difference]: With dead ends: 51 [2020-08-18 21:56:08,272 INFO L226 Difference]: Without dead ends: 39 [2020-08-18 21:56:08,272 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:56:08,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-18 21:56:08,276 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-18 21:56:08,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 21:56:08,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-18 21:56:08,277 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 36 [2020-08-18 21:56:08,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:08,278 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-18 21:56:08,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:56:08,278 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-18 21:56:08,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 21:56:08,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:08,279 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:08,279 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:56:08,280 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:08,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:08,280 INFO L82 PathProgramCache]: Analyzing trace with hash 1671822879, now seen corresponding path program 10 times [2020-08-18 21:56:08,280 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:08,280 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89286660] [2020-08-18 21:56:08,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:08,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:19,129 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 8 [2020-08-18 21:56:20,165 WARN L193 SmtUtils]: Spent 841.00 ms on a formula simplification. DAG size of input: 567 DAG size of output: 11 [2020-08-18 21:56:24,344 WARN L193 SmtUtils]: Spent 3.74 s on a formula simplification. DAG size of input: 1063 DAG size of output: 8 [2020-08-18 21:56:52,220 WARN L193 SmtUtils]: Spent 26.90 s on a formula simplification. DAG size of input: 2458 DAG size of output: 8 [2020-08-18 21:56:52,494 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 31 [2020-08-18 21:56:52,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:56:52,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:52,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 31 [2020-08-18 21:56:52,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:52,600 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 99 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 21:56:52,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89286660] [2020-08-18 21:56:52,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:56:52,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 21:56:52,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016572829] [2020-08-18 21:56:52,602 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 21:56:52,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:56:52,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 21:56:52,603 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:56:52,603 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 16 states. [2020-08-18 21:56:53,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:56:53,082 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-18 21:56:53,082 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 21:56:53,082 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-18 21:56:53,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:56:53,083 INFO L225 Difference]: With dead ends: 49 [2020-08-18 21:56:53,084 INFO L226 Difference]: Without dead ends: 41 [2020-08-18 21:56:53,084 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 33.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:56:53,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-18 21:56:53,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-18 21:56:53,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 21:56:53,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2020-08-18 21:56:53,097 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 38 [2020-08-18 21:56:53,097 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:56:53,097 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2020-08-18 21:56:53,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 21:56:53,099 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2020-08-18 21:56:53,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 21:56:53,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:56:53,101 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:56:53,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:56:53,101 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:56:53,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:56:53,101 INFO L82 PathProgramCache]: Analyzing trace with hash 443458522, now seen corresponding path program 1 times [2020-08-18 21:56:53,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:56:53,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [488911568] [2020-08-18 21:56:53,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:56:53,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:56:57,266 WARN L193 SmtUtils]: Spent 302.00 ms on a formula simplification. DAG size of input: 180 DAG size of output: 8 [2020-08-18 21:56:58,317 WARN L193 SmtUtils]: Spent 845.00 ms on a formula simplification. DAG size of input: 401 DAG size of output: 8 [2020-08-18 21:57:02,368 WARN L193 SmtUtils]: Spent 3.72 s on a formula simplification. DAG size of input: 830 DAG size of output: 8 [2020-08-18 21:57:02,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:57:02,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:57:02,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-18 21:57:02,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:57:02,951 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 0 proven. 101 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-18 21:57:02,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [488911568] [2020-08-18 21:57:02,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:57:02,952 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:57:02,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1381835189] [2020-08-18 21:57:02,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:57:02,953 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:57:02,953 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:57:02,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:57:02,953 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 21 states. [2020-08-18 21:57:03,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:57:03,870 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-08-18 21:57:03,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:57:03,871 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 40 [2020-08-18 21:57:03,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:57:03,873 INFO L225 Difference]: With dead ends: 48 [2020-08-18 21:57:03,874 INFO L226 Difference]: Without dead ends: 43 [2020-08-18 21:57:03,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 6.2s TimeCoverageRelationStatistics Valid=94, Invalid=718, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:57:03,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-18 21:57:03,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-18 21:57:03,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 21:57:03,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 44 transitions. [2020-08-18 21:57:03,883 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 44 transitions. Word has length 40 [2020-08-18 21:57:03,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:57:03,883 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 44 transitions. [2020-08-18 21:57:03,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:57:03,884 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 44 transitions. [2020-08-18 21:57:03,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 21:57:03,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:57:03,884 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:57:03,885 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:57:03,885 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:57:03,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:57:03,885 INFO L82 PathProgramCache]: Analyzing trace with hash 1101317845, now seen corresponding path program 2 times [2020-08-18 21:57:03,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:57:03,886 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998415271] [2020-08-18 21:57:03,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:57:04,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat