/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=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i20_o20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:20:00,366 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 17:20:00,412 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:20:00,421 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:20:00,423 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:20:00,427 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:20:00,429 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:20:00,432 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:20:00,433 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:20:00,434 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:20:00,435 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:20:00,438 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:20:00,440 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:20:00,442 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:20:00,443 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:20:00,444 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:20:00,446 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:20:00,454 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:20:00,456 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:20:00,457 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:20:00,458 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:20:00,459 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:20:00,471 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 17:20:00,484 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:20:00,485 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:20:00,485 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:20:00,486 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 17:20:00,508 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:20:00,509 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:20:00,510 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:20:00,510 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:20:00,510 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:20:00,511 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:20:00,511 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:20:00,511 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:20:00,511 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:20:00,512 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:20:00,512 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:20:00,512 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:20:00,512 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:20:00,512 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:20:00,512 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:20:00,513 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:20:00,513 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:20:00,513 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:20:00,513 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:20:00,513 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:20:00,514 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:20:00,514 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:20:00,514 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:20:00,514 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:20:00,514 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:20:00,515 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:20:00,515 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:20:00,515 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:20:00,515 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:20:00,515 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=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:20:00,844 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:20:00,864 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:20:00,867 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:20:00,870 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:20:00,871 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:20:00,872 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i20_o20-2.c [2020-08-21 17:20:00,950 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/74620875c/dd5c1f0795414c5f8bcaa534f358156c/FLAG814208c16 [2020-08-21 17:20:01,438 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:20:01,439 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_i20_o20-2.c [2020-08-21 17:20:01,446 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/74620875c/dd5c1f0795414c5f8bcaa534f358156c/FLAG814208c16 [2020-08-21 17:20:01,809 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/74620875c/dd5c1f0795414c5f8bcaa534f358156c [2020-08-21 17:20:01,820 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:20:01,822 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:20:01,823 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:20:01,824 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:20:01,828 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:20:01,829 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:20:01" (1/1) ... [2020-08-21 17:20:01,833 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2d2e2660 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:01, skipping insertion in model container [2020-08-21 17:20:01,833 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:20:01" (1/1) ... [2020-08-21 17:20:01,842 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:20:01,860 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:20:02,058 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:20:02,061 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:20:02,073 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:20:02,085 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:20:02,086 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02 WrapperNode [2020-08-21 17:20:02,086 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:20:02,087 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:20:02,087 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:20:02,087 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:20:02,097 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... [2020-08-21 17:20:02,098 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... [2020-08-21 17:20:02,194 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... [2020-08-21 17:20:02,195 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... [2020-08-21 17:20:02,202 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... [2020-08-21 17:20:02,204 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... [2020-08-21 17:20:02,207 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... [2020-08-21 17:20:02,208 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:20:02,209 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:20:02,209 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:20:02,209 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:20:02,210 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:20:02,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:20:02,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:20:02,273 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-21 17:20:02,273 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:20:02,273 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 17:20:02,273 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:20:02,273 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-21 17:20:02,273 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:20:02,274 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:20:02,274 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:20:02,432 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:20:02,432 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 17:20:02,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:20:02 BoogieIcfgContainer [2020-08-21 17:20:02,436 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:20:02,438 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:20:02,438 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:20:02,441 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:20:02,441 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:20:01" (1/3) ... [2020-08-21 17:20:02,442 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53fb7df3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:20:02, skipping insertion in model container [2020-08-21 17:20:02,442 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:20:02" (2/3) ... [2020-08-21 17:20:02,443 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@53fb7df3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:20:02, skipping insertion in model container [2020-08-21 17:20:02,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:20:02" (3/3) ... [2020-08-21 17:20:02,445 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i20_o20-2.c [2020-08-21 17:20:02,456 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:20:02,464 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:20:02,482 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:20:02,507 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:20:02,507 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:20:02,507 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:20:02,507 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:20:02,507 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:20:02,508 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:20:02,508 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:20:02,508 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:20:02,524 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 17:20:02,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:20:02,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:02,531 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:02,531 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:02,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:02,537 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-21 17:20:02,544 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:02,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [266632493] [2020-08-21 17:20:02,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:02,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:02,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:02,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:02,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:02,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:02,850 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:20:02,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [266632493] [2020-08-21 17:20:02,854 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:20:02,854 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:20:02,855 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810384776] [2020-08-21 17:20:02,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:20:02,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:02,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:20:02,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:20:02,873 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 17:20:02,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:02,943 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-08-21 17:20:02,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:20:02,946 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 17:20:02,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:02,957 INFO L225 Difference]: With dead ends: 30 [2020-08-21 17:20:02,957 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 17:20:02,961 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:20:02,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 17:20:02,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 17:20:03,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 17:20:03,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 17:20:03,003 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 17:20:03,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:03,003 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 17:20:03,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:20:03,004 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 17:20:03,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 17:20:03,006 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:03,006 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:03,006 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:20:03,007 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:03,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:03,007 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-21 17:20:03,008 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:03,008 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1952121559] [2020-08-21 17:20:03,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:03,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:03,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:03,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:03,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,140 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 17:20:03,141 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1952121559] [2020-08-21 17:20:03,141 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:03,142 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:20:03,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569938086] [2020-08-21 17:20:03,144 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:20:03,144 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:03,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:20:03,145 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:20:03,146 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 6 states. [2020-08-21 17:20:03,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:03,226 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 17:20:03,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:20:03,227 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 17:20:03,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:03,228 INFO L225 Difference]: With dead ends: 25 [2020-08-21 17:20:03,228 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 17:20:03,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:20:03,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 17:20:03,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 17:20:03,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 17:20:03,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 17:20:03,237 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 17:20:03,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:03,238 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 17:20:03,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:20:03,238 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 17:20:03,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 17:20:03,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:03,240 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:03,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:20:03,241 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:03,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:03,241 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-21 17:20:03,242 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:03,242 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [300618762] [2020-08-21 17:20:03,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:03,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:03,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:03,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:03,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:03,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,420 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 17:20:03,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [300618762] [2020-08-21 17:20:03,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:03,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:20:03,422 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549679705] [2020-08-21 17:20:03,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:20:03,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:03,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:20:03,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:20:03,424 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 7 states. [2020-08-21 17:20:03,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:03,490 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 17:20:03,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:20:03,491 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-08-21 17:20:03,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:03,492 INFO L225 Difference]: With dead ends: 28 [2020-08-21 17:20:03,492 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 17:20:03,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:20:03,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 17:20:03,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 17:20:03,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 17:20:03,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 17:20:03,501 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 17:20:03,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:03,502 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 17:20:03,502 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:20:03,502 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 17:20:03,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 17:20:03,503 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:03,504 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:03,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:20:03,504 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:03,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:03,505 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-21 17:20:03,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:03,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2041393185] [2020-08-21 17:20:03,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:03,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,566 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:03,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:03,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:03,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:03,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:03,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,716 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-21 17:20:03,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2041393185] [2020-08-21 17:20:03,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:03,717 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:20:03,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188246395] [2020-08-21 17:20:03,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:20:03,719 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:03,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:20:03,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:20:03,720 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 8 states. [2020-08-21 17:20:03,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:03,836 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-21 17:20:03,838 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:20:03,838 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-08-21 17:20:03,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:03,840 INFO L225 Difference]: With dead ends: 31 [2020-08-21 17:20:03,840 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 17:20:03,841 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:20:03,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 17:20:03,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 17:20:03,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 17:20:03,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 17:20:03,855 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-21 17:20:03,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:03,858 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 17:20:03,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:20:03,858 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 17:20:03,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 17:20:03,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:03,861 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:03,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:20:03,862 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:03,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:03,862 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-08-21 17:20:03,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:03,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2114293393] [2020-08-21 17:20:03,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:03,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:03,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:03,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:03,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:03,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,105 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-21 17:20:04,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2114293393] [2020-08-21 17:20:04,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:04,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:20:04,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [151586046] [2020-08-21 17:20:04,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:20:04,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:04,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:20:04,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=47, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:20:04,108 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 9 states. [2020-08-21 17:20:04,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:04,199 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 17:20:04,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:20:04,200 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2020-08-21 17:20:04,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:04,201 INFO L225 Difference]: With dead ends: 34 [2020-08-21 17:20:04,201 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:20:04,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=65, Invalid=117, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:20:04,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:20:04,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 17:20:04,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 17:20:04,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-21 17:20:04,210 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-21 17:20:04,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:04,210 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-21 17:20:04,210 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:20:04,211 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-21 17:20:04,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 17:20:04,212 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:04,212 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:04,212 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:20:04,213 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:04,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:04,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-08-21 17:20:04,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:04,214 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827467975] [2020-08-21 17:20:04,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:04,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,245 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:04,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:04,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,337 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,454 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-21 17:20:04,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827467975] [2020-08-21 17:20:04,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:04,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:20:04,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [704778848] [2020-08-21 17:20:04,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:20:04,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:04,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:20:04,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:20:04,460 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 10 states. [2020-08-21 17:20:04,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:04,576 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-21 17:20:04,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:20:04,577 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 43 [2020-08-21 17:20:04,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:04,581 INFO L225 Difference]: With dead ends: 37 [2020-08-21 17:20:04,581 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 17:20:04,582 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=86, Invalid=154, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:20:04,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 17:20:04,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 17:20:04,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 17:20:04,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 17:20:04,592 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-21 17:20:04,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:04,594 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 17:20:04,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:20:04,594 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 17:20:04,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 17:20:04,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:04,603 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:04,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:20:04,603 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:04,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:04,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-08-21 17:20:04,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:04,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [96309954] [2020-08-21 17:20:04,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:04,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:04,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:04,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:04,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:04,851 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-21 17:20:04,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [96309954] [2020-08-21 17:20:04,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:04,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:20:04,853 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263644475] [2020-08-21 17:20:04,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:20:04,854 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:04,854 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:20:04,854 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:20:04,855 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 11 states. [2020-08-21 17:20:04,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:04,999 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-21 17:20:05,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:20:05,000 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 49 [2020-08-21 17:20:05,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:05,002 INFO L225 Difference]: With dead ends: 40 [2020-08-21 17:20:05,002 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 17:20:05,003 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=110, Invalid=196, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:20:05,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 17:20:05,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 17:20:05,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 17:20:05,009 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-21 17:20:05,009 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-21 17:20:05,010 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:05,010 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-21 17:20:05,010 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:20:05,010 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-21 17:20:05,011 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 17:20:05,011 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:05,011 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:05,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:20:05,012 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:05,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:05,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-08-21 17:20:05,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:05,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440657996] [2020-08-21 17:20:05,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:05,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:05,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,041 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:05,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,233 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-21 17:20:05,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440657996] [2020-08-21 17:20:05,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:05,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:20:05,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984153432] [2020-08-21 17:20:05,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:20:05,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:05,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:20:05,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:20:05,236 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 12 states. [2020-08-21 17:20:05,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:05,356 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-21 17:20:05,357 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:20:05,357 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 55 [2020-08-21 17:20:05,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:05,359 INFO L225 Difference]: With dead ends: 43 [2020-08-21 17:20:05,359 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 17:20:05,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=137, Invalid=243, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:20:05,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 17:20:05,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 17:20:05,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:20:05,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 17:20:05,366 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-21 17:20:05,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:05,367 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 17:20:05,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:20:05,367 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 17:20:05,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 17:20:05,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:05,368 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:05,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:20:05,369 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:05,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:05,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-08-21 17:20:05,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:05,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73099634] [2020-08-21 17:20:05,370 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:05,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:05,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:05,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,437 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,531 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,576 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,701 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-21 17:20:05,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73099634] [2020-08-21 17:20:05,702 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:05,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:20:05,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794677915] [2020-08-21 17:20:05,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:20:05,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:05,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:20:05,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:20:05,704 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 13 states. [2020-08-21 17:20:05,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:05,832 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-21 17:20:05,833 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:20:05,833 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 61 [2020-08-21 17:20:05,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:05,836 INFO L225 Difference]: With dead ends: 46 [2020-08-21 17:20:05,836 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 17:20:05,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=295, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:20:05,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 17:20:05,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 17:20:05,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 17:20:05,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-21 17:20:05,844 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-21 17:20:05,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:05,844 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-21 17:20:05,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:20:05,844 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-21 17:20:05,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 17:20:05,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:05,846 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:05,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:20:05,846 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:05,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:05,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-08-21 17:20:05,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:05,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213233233] [2020-08-21 17:20:05,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:05,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:05,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:05,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,914 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:05,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:05,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,034 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,055 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,128 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-21 17:20:06,129 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213233233] [2020-08-21 17:20:06,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:06,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:20:06,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536573127] [2020-08-21 17:20:06,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:20:06,130 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:06,130 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:20:06,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=112, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:20:06,131 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 14 states. [2020-08-21 17:20:06,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:06,265 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 17:20:06,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:20:06,266 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 67 [2020-08-21 17:20:06,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:06,267 INFO L225 Difference]: With dead ends: 49 [2020-08-21 17:20:06,268 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 17:20:06,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=200, Invalid=352, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:20:06,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 17:20:06,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 17:20:06,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 17:20:06,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 17:20:06,275 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-21 17:20:06,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:06,275 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 17:20:06,276 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:20:06,276 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 17:20:06,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 17:20:06,277 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:06,277 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:06,277 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:20:06,277 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:06,278 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:06,278 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-08-21 17:20:06,278 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:06,278 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [982223582] [2020-08-21 17:20:06,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:06,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:06,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,313 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:06,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,459 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,611 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-21 17:20:06,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [982223582] [2020-08-21 17:20:06,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:06,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:20:06,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1863435251] [2020-08-21 17:20:06,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:20:06,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:06,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:20:06,613 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:20:06,613 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 15 states. [2020-08-21 17:20:06,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:06,803 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-21 17:20:06,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:20:06,804 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2020-08-21 17:20:06,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:06,806 INFO L225 Difference]: With dead ends: 52 [2020-08-21 17:20:06,806 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 17:20:06,808 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=236, Invalid=414, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:20:06,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 17:20:06,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 17:20:06,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 17:20:06,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-21 17:20:06,814 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-21 17:20:06,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:06,815 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-21 17:20:06,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:20:06,815 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-21 17:20:06,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 17:20:06,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:06,816 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:06,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:20:06,817 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:06,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:06,817 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-08-21 17:20:06,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:06,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1174878106] [2020-08-21 17:20:06,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:06,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:06,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,856 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:06,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:06,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:06,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,108 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,196 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,291 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-21 17:20:07,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1174878106] [2020-08-21 17:20:07,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:07,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:20:07,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124595094] [2020-08-21 17:20:07,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:20:07,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:07,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:20:07,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=145, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:20:07,294 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 16 states. [2020-08-21 17:20:07,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:07,470 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-21 17:20:07,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:20:07,471 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 79 [2020-08-21 17:20:07,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:07,472 INFO L225 Difference]: With dead ends: 55 [2020-08-21 17:20:07,472 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 17:20:07,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=275, Invalid=481, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:20:07,474 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 17:20:07,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 17:20:07,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 17:20:07,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 17:20:07,480 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-21 17:20:07,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:07,480 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 17:20:07,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:20:07,480 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 17:20:07,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 17:20:07,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:07,481 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:07,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:20:07,482 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:07,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:07,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-08-21 17:20:07,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:07,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2767937] [2020-08-21 17:20:07,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:07,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:07,521 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:07,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,561 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,676 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,809 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,853 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:07,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:07,919 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-21 17:20:07,920 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2767937] [2020-08-21 17:20:07,920 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:07,920 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:20:07,920 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1679823001] [2020-08-21 17:20:07,921 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:20:07,921 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:07,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:20:07,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=163, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:20:07,922 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 17 states. [2020-08-21 17:20:08,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:08,097 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-21 17:20:08,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:20:08,098 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 85 [2020-08-21 17:20:08,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:08,099 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:20:08,099 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 17:20:08,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=317, Invalid=553, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:20:08,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 17:20:08,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 17:20:08,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 17:20:08,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-21 17:20:08,106 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-21 17:20:08,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:08,106 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-21 17:20:08,106 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:20:08,107 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-21 17:20:08,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 17:20:08,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:08,108 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:08,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:20:08,108 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:08,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:08,108 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-08-21 17:20:08,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:08,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [675158797] [2020-08-21 17:20:08,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:08,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:08,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,146 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:08,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,270 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,322 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,370 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,392 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,481 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,595 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-21 17:20:08,595 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [675158797] [2020-08-21 17:20:08,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:08,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:20:08,596 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252758793] [2020-08-21 17:20:08,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:20:08,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:08,597 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:20:08,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=182, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:20:08,598 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 18 states. [2020-08-21 17:20:08,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:08,803 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-21 17:20:08,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:20:08,803 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 91 [2020-08-21 17:20:08,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:08,804 INFO L225 Difference]: With dead ends: 61 [2020-08-21 17:20:08,805 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 17:20:08,806 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=362, Invalid=630, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:20:08,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 17:20:08,809 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 17:20:08,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 17:20:08,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 17:20:08,811 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-21 17:20:08,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:08,811 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 17:20:08,811 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:20:08,811 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 17:20:08,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 17:20:08,812 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:08,812 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:08,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:20:08,813 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:08,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:08,813 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-08-21 17:20:08,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:08,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756282990] [2020-08-21 17:20:08,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:08,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:08,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:08,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:08,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:08,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,240 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,344 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-21 17:20:09,345 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756282990] [2020-08-21 17:20:09,345 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:09,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:20:09,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929891011] [2020-08-21 17:20:09,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:20:09,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:09,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:20:09,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=140, Invalid=202, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:20:09,347 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 19 states. [2020-08-21 17:20:09,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:09,547 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-21 17:20:09,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:20:09,548 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 97 [2020-08-21 17:20:09,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:09,549 INFO L225 Difference]: With dead ends: 64 [2020-08-21 17:20:09,549 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 17:20:09,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=410, Invalid=712, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:20:09,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 17:20:09,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 17:20:09,555 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 17:20:09,556 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-21 17:20:09,556 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-21 17:20:09,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:09,556 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-21 17:20:09,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:20:09,557 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-21 17:20:09,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 17:20:09,558 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:09,558 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:09,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:20:09,558 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:09,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:09,559 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-08-21 17:20:09,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:09,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938574240] [2020-08-21 17:20:09,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:09,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:09,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:09,612 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,792 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,824 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,912 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,969 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:09,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:09,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,166 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-08-21 17:20:10,166 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938574240] [2020-08-21 17:20:10,168 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:10,169 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:20:10,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376997528] [2020-08-21 17:20:10,169 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:20:10,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:10,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:20:10,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=157, Invalid=223, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:20:10,171 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 20 states. [2020-08-21 17:20:10,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:10,410 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-08-21 17:20:10,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:20:10,411 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 103 [2020-08-21 17:20:10,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:10,412 INFO L225 Difference]: With dead ends: 67 [2020-08-21 17:20:10,412 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 17:20:10,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 225 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=461, Invalid=799, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:20:10,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 17:20:10,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-08-21 17:20:10,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 17:20:10,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-08-21 17:20:10,427 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2020-08-21 17:20:10,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:10,428 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-08-21 17:20:10,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:20:10,428 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-08-21 17:20:10,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 17:20:10,429 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:10,430 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:10,430 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:20:10,430 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:10,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:10,431 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2020-08-21 17:20:10,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:10,433 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1427719012] [2020-08-21 17:20:10,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:10,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:10,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,477 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:10,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,562 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,770 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,807 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,841 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,876 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:10,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:10,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,139 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-08-21 17:20:11,139 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1427719012] [2020-08-21 17:20:11,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:11,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:20:11,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363323090] [2020-08-21 17:20:11,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:20:11,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:11,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:20:11,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=245, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:20:11,143 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 21 states. [2020-08-21 17:20:11,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:11,392 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2020-08-21 17:20:11,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:20:11,393 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 109 [2020-08-21 17:20:11,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:11,395 INFO L225 Difference]: With dead ends: 70 [2020-08-21 17:20:11,395 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 17:20:11,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 256 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=515, Invalid=891, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:20:11,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 17:20:11,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-08-21 17:20:11,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 17:20:11,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2020-08-21 17:20:11,406 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2020-08-21 17:20:11,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:11,406 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2020-08-21 17:20:11,406 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:20:11,406 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2020-08-21 17:20:11,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-08-21 17:20:11,408 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:11,409 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:11,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:20:11,409 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:11,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:11,409 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2020-08-21 17:20:11,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:11,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1251903823] [2020-08-21 17:20:11,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:11,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,446 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:11,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,447 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:11,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,582 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,619 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,817 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,901 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,954 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:11,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:11,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,145 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2020-08-21 17:20:12,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1251903823] [2020-08-21 17:20:12,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:12,146 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:20:12,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258476695] [2020-08-21 17:20:12,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:20:12,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:12,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:20:12,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=268, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:20:12,148 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 22 states. [2020-08-21 17:20:12,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:12,436 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2020-08-21 17:20:12,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:20:12,436 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 115 [2020-08-21 17:20:12,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:12,437 INFO L225 Difference]: With dead ends: 73 [2020-08-21 17:20:12,438 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 17:20:12,440 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=572, Invalid=988, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:20:12,440 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 17:20:12,445 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-08-21 17:20:12,445 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 17:20:12,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-08-21 17:20:12,447 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2020-08-21 17:20:12,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:12,448 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-08-21 17:20:12,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:20:12,448 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-08-21 17:20:12,449 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-08-21 17:20:12,449 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:12,449 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:12,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:20:12,450 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:12,450 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:12,450 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2020-08-21 17:20:12,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:12,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1555317330] [2020-08-21 17:20:12,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:12,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:12,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:12,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,595 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,630 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,956 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:12,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:12,993 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,000 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,340 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2020-08-21 17:20:13,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1555317330] [2020-08-21 17:20:13,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:13,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:20:13,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161658478] [2020-08-21 17:20:13,343 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:20:13,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:13,344 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:20:13,344 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=214, Invalid=292, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:20:13,344 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 23 states. [2020-08-21 17:20:13,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:13,629 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2020-08-21 17:20:13,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:20:13,630 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 121 [2020-08-21 17:20:13,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:13,632 INFO L225 Difference]: With dead ends: 76 [2020-08-21 17:20:13,632 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 17:20:13,634 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 324 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=1090, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:20:13,635 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 17:20:13,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-08-21 17:20:13,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 17:20:13,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2020-08-21 17:20:13,643 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2020-08-21 17:20:13,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:13,644 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2020-08-21 17:20:13,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:20:13,644 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2020-08-21 17:20:13,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-08-21 17:20:13,647 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:13,647 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:13,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:20:13,648 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:13,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:13,648 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2020-08-21 17:20:13,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:13,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [416711190] [2020-08-21 17:20:13,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:13,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:20:13,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,703 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:20:13,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:13,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:13,992 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,039 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,278 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,395 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 17:20:14,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:20:14,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-08-21 17:20:14,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [416711190] [2020-08-21 17:20:14,588 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:20:14,588 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 17:20:14,588 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [690885368] [2020-08-21 17:20:14,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 17:20:14,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:20:14,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 17:20:14,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=317, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:20:14,590 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 24 states. [2020-08-21 17:20:14,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:20:14,886 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2020-08-21 17:20:14,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 17:20:14,887 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 127 [2020-08-21 17:20:14,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:20:14,888 INFO L225 Difference]: With dead ends: 79 [2020-08-21 17:20:14,888 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 17:20:14,889 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 361 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=695, Invalid=1197, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:20:14,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 17:20:14,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-08-21 17:20:14,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 17:20:14,894 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2020-08-21 17:20:14,894 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2020-08-21 17:20:14,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:20:14,895 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2020-08-21 17:20:14,895 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 17:20:14,895 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2020-08-21 17:20:14,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-08-21 17:20:14,896 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:20:14,897 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:20:14,897 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:20:14,897 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:20:14,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:20:14,897 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2020-08-21 17:20:14,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:20:14,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1581260437] [2020-08-21 17:20:14,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:20:14,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 17:20:14,942 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 17:20:14,943 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 17:20:14,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:20:15,003 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 05:20:15 BoogieIcfgContainer [2020-08-21 17:20:15,003 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 17:20:15,006 INFO L168 Benchmark]: Toolchain (without parser) took 13183.28 ms. Allocated memory was 138.4 MB in the beginning and 470.3 MB in the end (delta: 331.9 MB). Free memory was 100.9 MB in the beginning and 145.0 MB in the end (delta: -44.1 MB). Peak memory consumption was 287.8 MB. Max. memory is 7.1 GB. [2020-08-21 17:20:15,007 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 138.4 MB. Free memory was 120.0 MB in the beginning and 119.6 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. [2020-08-21 17:20:15,007 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.13 ms. Allocated memory is still 138.4 MB. Free memory was 100.5 MB in the beginning and 91.6 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. [2020-08-21 17:20:15,008 INFO L168 Benchmark]: Boogie Preprocessor took 121.20 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 91.6 MB in the beginning and 181.2 MB in the end (delta: -89.6 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-08-21 17:20:15,008 INFO L168 Benchmark]: RCFGBuilder took 227.76 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 169.7 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. [2020-08-21 17:20:15,009 INFO L168 Benchmark]: TraceAbstraction took 12565.78 ms. Allocated memory was 202.4 MB in the beginning and 470.3 MB in the end (delta: 267.9 MB). Free memory was 169.7 MB in the beginning and 145.0 MB in the end (delta: 24.6 MB). Peak memory consumption was 292.5 MB. Max. memory is 7.1 GB. [2020-08-21 17:20:15,011 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 138.4 MB. Free memory was 120.0 MB in the beginning and 119.6 MB in the end (delta: 419.8 kB). Peak memory consumption was 419.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 263.13 ms. Allocated memory is still 138.4 MB. Free memory was 100.5 MB in the beginning and 91.6 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 121.20 ms. Allocated memory was 138.4 MB in the beginning and 202.4 MB in the end (delta: 64.0 MB). Free memory was 91.6 MB in the beginning and 181.2 MB in the end (delta: -89.6 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 227.76 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 169.7 MB in the end (delta: 11.5 MB). Peak memory consumption was 11.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 12565.78 ms. Allocated memory was 202.4 MB in the beginning and 470.3 MB in the end (delta: 267.9 MB). Free memory was 169.7 MB in the beginning and 145.0 MB in the end (delta: 24.6 MB). Peak memory consumption was 292.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 20; [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] int result = id(input); [L12] COND TRUE result == 20 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 12.4s, OverallIterations: 21, TraceHistogramMax: 21, AutomataDifference: 3.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 264 SDtfs, 523 SDslu, 1198 SDs, 0 SdLazy, 710 SolverSat, 47 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.8s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 940 GetRequests, 480 SyntacticMatches, 0 SemanticMatches, 460 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2470 ImplicationChecksByTransitivity, 5.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 8.0s InterpolantComputationTime, 1533 NumberOfCodeBlocks, 1533 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 1380 ConstructedInterpolants, 0 QuantifiedInterpolants, 301200 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 20 InterpolantComputations, 1 PerfectInterpolantSequences, 3800/7600 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 incorrect! Received shutdown request...