/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:30:17,450 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 21:30:17,478 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:30:17,479 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:30:17,480 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:30:17,482 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:30:17,484 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:30:17,485 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:30:17,486 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:30:17,488 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:30:17,488 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:30:17,490 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:30:17,491 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:30:17,498 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:30:17,499 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:30:17,500 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:30:17,501 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:30:17,503 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:30:17,505 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:30:17,506 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:30:17,507 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:30:17,508 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:30:17,510 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:30:17,518 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:30:17,519 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:30:17,520 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:30:17,521 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 21:30:17,544 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:30:17,544 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:30:17,546 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:30:17,546 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:30:17,546 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:30:17,547 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:30:17,547 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:30:17,547 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:30:17,547 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:30:17,547 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:30:17,548 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:30:17,548 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:30:17,548 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:30:17,548 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:30:17,548 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:30:17,549 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:30:17,549 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:30:17,549 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:30:17,549 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:30:17,550 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:30:17,550 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:30:17,550 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:30:17,550 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:30:17,550 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:30:17,551 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:30:17,551 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:30:17,551 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:30:17,551 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:30:17,551 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:30:17,552 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:30:17,843 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:30:17,855 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:30:17,859 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:30:17,860 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:30:17,861 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:30:17,861 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 21:30:17,931 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/796c04710/eb35c994c42946cebc2c246f98fdacfd/FLAG0ed3b7e5f [2020-08-21 21:30:18,348 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:30:18,349 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-21 21:30:18,355 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/796c04710/eb35c994c42946cebc2c246f98fdacfd/FLAG0ed3b7e5f [2020-08-21 21:30:18,773 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/796c04710/eb35c994c42946cebc2c246f98fdacfd [2020-08-21 21:30:18,782 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:30:18,784 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:30:18,785 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:30:18,785 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:30:18,789 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:30:18,790 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:30:18" (1/1) ... [2020-08-21 21:30:18,793 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@156e2246 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:18, skipping insertion in model container [2020-08-21 21:30:18,793 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:30:18" (1/1) ... [2020-08-21 21:30:18,802 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:30:18,827 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:30:19,001 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:30:19,006 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:30:19,019 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:30:19,030 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:30:19,031 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19 WrapperNode [2020-08-21 21:30:19,031 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:30:19,032 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:30:19,032 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:30:19,032 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:30:19,041 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... [2020-08-21 21:30:19,042 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... [2020-08-21 21:30:19,118 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... [2020-08-21 21:30:19,118 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... [2020-08-21 21:30:19,122 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... [2020-08-21 21:30:19,127 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... [2020-08-21 21:30:19,128 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... [2020-08-21 21:30:19,129 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:30:19,130 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:30:19,130 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:30:19,130 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:30:19,131 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:30:19,188 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:30:19,188 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:30:19,188 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 21:30:19,189 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 21:30:19,189 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:30:19,189 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:30:19,189 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 21:30:19,190 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 21:30:19,190 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 21:30:19,191 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 21:30:19,192 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:30:19,192 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:30:19,192 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:30:19,422 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:30:19,423 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 21:30:19,431 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:30:19 BoogieIcfgContainer [2020-08-21 21:30:19,431 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:30:19,436 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:30:19,436 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:30:19,447 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:30:19,447 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:30:18" (1/3) ... [2020-08-21 21:30:19,448 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19b1fc49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:30:19, skipping insertion in model container [2020-08-21 21:30:19,452 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:30:19" (2/3) ... [2020-08-21 21:30:19,452 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19b1fc49 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:30:19, skipping insertion in model container [2020-08-21 21:30:19,453 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:30:19" (3/3) ... [2020-08-21 21:30:19,458 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-21 21:30:19,481 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:30:19,488 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:30:19,508 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:30:19,531 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:30:19,531 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:30:19,532 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:30:19,532 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:30:19,532 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:30:19,532 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:30:19,532 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:30:19,532 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:30:19,548 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 21:30:19,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 21:30:19,553 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:19,554 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:19,554 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:19,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:19,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-21 21:30:19,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:19,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [776396759] [2020-08-21 21:30:19,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:19,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:19,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,693 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:19,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [776396759] [2020-08-21 21:30:19,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:30:19,697 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 21:30:19,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83596798] [2020-08-21 21:30:19,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 21:30:19,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:19,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 21:30:19,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 21:30:19,723 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-21 21:30:19,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:19,750 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-21 21:30:19,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 21:30:19,751 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-21 21:30:19,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:19,761 INFO L225 Difference]: With dead ends: 37 [2020-08-21 21:30:19,761 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 21:30:19,765 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 21:30:19,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 21:30:19,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 21:30:19,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 21:30:19,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-21 21:30:19,808 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-21 21:30:19,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:19,809 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-21 21:30:19,809 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 21:30:19,810 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-21 21:30:19,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-21 21:30:19,810 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:19,811 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:19,811 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:30:19,811 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:19,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:19,812 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-21 21:30:19,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:19,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [570392753] [2020-08-21 21:30:19,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:19,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:19,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:19,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [570392753] [2020-08-21 21:30:19,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:30:19,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:30:19,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1457001162] [2020-08-21 21:30:19,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:30:19,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:19,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:30:19,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:30:19,866 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-21 21:30:19,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:19,888 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-21 21:30:19,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:30:19,889 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-21 21:30:19,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:19,890 INFO L225 Difference]: With dead ends: 20 [2020-08-21 21:30:19,890 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 21:30:19,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:30:19,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 21:30:19,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 21:30:19,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 21:30:19,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 21:30:19,898 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-21 21:30:19,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:19,898 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 21:30:19,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:30:19,899 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 21:30:19,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 21:30:19,899 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:19,900 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:19,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:30:19,900 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:19,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:19,901 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-21 21:30:19,901 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:19,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [922952991] [2020-08-21 21:30:19,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:19,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:19,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:19,938 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:19,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [922952991] [2020-08-21 21:30:19,938 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:30:19,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 21:30:19,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747534278] [2020-08-21 21:30:19,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 21:30:19,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:19,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 21:30:19,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:30:19,941 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 21:30:19,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:19,950 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-21 21:30:19,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:30:19,951 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-21 21:30:19,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:19,952 INFO L225 Difference]: With dead ends: 25 [2020-08-21 21:30:19,952 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 21:30:19,953 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 21:30:19,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 21:30:19,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-21 21:30:19,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 21:30:19,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 21:30:19,958 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-21 21:30:19,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:19,959 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 21:30:19,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 21:30:19,959 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 21:30:19,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 21:30:19,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:19,960 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:19,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:30:19,961 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:19,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:19,961 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-21 21:30:19,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:19,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429674749] [2020-08-21 21:30:19,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:19,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,010 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429674749] [2020-08-21 21:30:20,011 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,011 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:30:20,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239182553] [2020-08-21 21:30:20,012 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:30:20,012 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,012 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:30:20,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:30:20,013 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-21 21:30:20,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,074 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-21 21:30:20,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:30:20,075 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-21 21:30:20,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,076 INFO L225 Difference]: With dead ends: 26 [2020-08-21 21:30:20,076 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 21:30:20,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:30:20,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 21:30:20,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 21:30:20,082 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 21:30:20,083 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 21:30:20,083 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-21 21:30:20,084 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,084 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 21:30:20,084 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:30:20,084 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 21:30:20,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 21:30:20,085 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,085 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:30:20,088 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,088 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,089 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-21 21:30:20,089 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,089 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969329246] [2020-08-21 21:30:20,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,186 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,186 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969329246] [2020-08-21 21:30:20,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:30:20,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613393307] [2020-08-21 21:30:20,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:30:20,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:30:20,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:30:20,189 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-21 21:30:20,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,310 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 21:30:20,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:30:20,311 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 21:30:20,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,312 INFO L225 Difference]: With dead ends: 27 [2020-08-21 21:30:20,312 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 21:30:20,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:30:20,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 21:30:20,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 21:30:20,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 21:30:20,324 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 21:30:20,325 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-21 21:30:20,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,325 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 21:30:20,325 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:30:20,325 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 21:30:20,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 21:30:20,327 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,327 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:30:20,328 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,328 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-21 21:30:20,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [172351880] [2020-08-21 21:30:20,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,419 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [172351880] [2020-08-21 21:30:20,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:30:20,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211225016] [2020-08-21 21:30:20,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:30:20,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:30:20,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:30:20,422 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-21 21:30:20,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,534 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-21 21:30:20,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:30:20,535 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-21 21:30:20,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,536 INFO L225 Difference]: With dead ends: 28 [2020-08-21 21:30:20,536 INFO L226 Difference]: Without dead ends: 19 [2020-08-21 21:30:20,537 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:30:20,537 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-21 21:30:20,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-21 21:30:20,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 21:30:20,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-21 21:30:20,543 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-21 21:30:20,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,544 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-21 21:30:20,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:30:20,544 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-21 21:30:20,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 21:30:20,545 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,545 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:30:20,546 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,546 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-21 21:30:20,546 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938481157] [2020-08-21 21:30:20,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,648 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,649 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938481157] [2020-08-21 21:30:20,649 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,649 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:30:20,649 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99575989] [2020-08-21 21:30:20,651 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:30:20,651 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,651 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:30:20,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:30:20,653 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-21 21:30:20,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:20,806 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-21 21:30:20,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:30:20,807 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-21 21:30:20,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:20,808 INFO L225 Difference]: With dead ends: 29 [2020-08-21 21:30:20,808 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 21:30:20,809 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:30:20,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 21:30:20,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 21:30:20,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 21:30:20,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 21:30:20,815 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-21 21:30:20,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:20,815 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 21:30:20,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:30:20,815 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 21:30:20,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 21:30:20,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:20,816 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:20,816 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:30:20,817 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:20,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:20,817 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-21 21:30:20,817 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:20,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658881753] [2020-08-21 21:30:20,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:20,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:20,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:20,902 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:30:20,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658881753] [2020-08-21 21:30:20,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:20,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:30:20,903 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995286248] [2020-08-21 21:30:20,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:30:20,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:20,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:30:20,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:30:20,905 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-21 21:30:21,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,064 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-21 21:30:21,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:30:21,065 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 21:30:21,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,066 INFO L225 Difference]: With dead ends: 30 [2020-08-21 21:30:21,066 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 21:30:21,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:30:21,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 21:30:21,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 21:30:21,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 21:30:21,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-21 21:30:21,072 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-21 21:30:21,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,073 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-21 21:30:21,073 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:30:21,073 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-21 21:30:21,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:30:21,074 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,074 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,074 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:30:21,074 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,075 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-21 21:30:21,075 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1673833956] [2020-08-21 21:30:21,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,111 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:21,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1673833956] [2020-08-21 21:30:21,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-21 21:30:21,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345659925] [2020-08-21 21:30:21,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:30:21,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:30:21,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:30:21,114 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-21 21:30:21,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,129 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-21 21:30:21,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:30:21,129 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 21:30:21,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,130 INFO L225 Difference]: With dead ends: 30 [2020-08-21 21:30:21,130 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 21:30:21,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:30:21,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 21:30:21,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-21 21:30:21,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 21:30:21,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-21 21:30:21,137 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-21 21:30:21,137 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,137 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-21 21:30:21,137 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:30:21,138 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-21 21:30:21,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:30:21,138 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,139 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:30:21,139 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,139 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-21 21:30:21,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705966418] [2020-08-21 21:30:21,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,216 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:21,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705966418] [2020-08-21 21:30:21,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 21:30:21,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994596552] [2020-08-21 21:30:21,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:30:21,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,218 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:30:21,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:30:21,219 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-21 21:30:21,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,241 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-21 21:30:21,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:30:21,242 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-21 21:30:21,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,243 INFO L225 Difference]: With dead ends: 34 [2020-08-21 21:30:21,243 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 21:30:21,243 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:30:21,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 21:30:21,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 21:30:21,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:30:21,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-21 21:30:21,250 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-21 21:30:21,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,250 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-21 21:30:21,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:30:21,251 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-21 21:30:21,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:30:21,251 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,252 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:30:21,252 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,252 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-21 21:30:21,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [522170302] [2020-08-21 21:30:21,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,306 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:21,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [522170302] [2020-08-21 21:30:21,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:30:21,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1165650666] [2020-08-21 21:30:21,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:30:21,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:30:21,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:30:21,308 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-21 21:30:21,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,336 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-21 21:30:21,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:30:21,336 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-21 21:30:21,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,337 INFO L225 Difference]: With dead ends: 38 [2020-08-21 21:30:21,337 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 21:30:21,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:30:21,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 21:30:21,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 21:30:21,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:30:21,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-21 21:30:21,344 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-21 21:30:21,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,345 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-21 21:30:21,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:30:21,345 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-21 21:30:21,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:30:21,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,346 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:30:21,346 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,347 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-21 21:30:21,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546832112] [2020-08-21 21:30:21,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,440 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:21,441 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546832112] [2020-08-21 21:30:21,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:30:21,442 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926902274] [2020-08-21 21:30:21,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:30:21,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,443 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:30:21,443 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:30:21,443 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-21 21:30:21,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,630 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-21 21:30:21,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:30:21,630 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-21 21:30:21,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,631 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:30:21,631 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:30:21,632 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:30:21,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:30:21,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-21 21:30:21,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 21:30:21,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-21 21:30:21,640 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-21 21:30:21,640 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,640 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-21 21:30:21,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:30:21,641 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-21 21:30:21,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 21:30:21,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,642 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:30:21,642 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-21 21:30:21,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537564223] [2020-08-21 21:30:21,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:21,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:21,755 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:21,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537564223] [2020-08-21 21:30:21,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:21,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:30:21,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508147573] [2020-08-21 21:30:21,757 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:30:21,757 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:21,757 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:30:21,757 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:30:21,757 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-21 21:30:21,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:21,962 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-21 21:30:21,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:30:21,963 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-21 21:30:21,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:21,964 INFO L225 Difference]: With dead ends: 55 [2020-08-21 21:30:21,964 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 21:30:21,965 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:30:21,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 21:30:21,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 21:30:21,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:30:21,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-21 21:30:21,971 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-21 21:30:21,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:21,972 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-21 21:30:21,972 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:30:21,972 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-21 21:30:21,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:30:21,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:21,973 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:21,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:30:21,973 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:21,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:21,974 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-21 21:30:21,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:21,974 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [513172254] [2020-08-21 21:30:21,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:21,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:22,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,093 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:22,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [513172254] [2020-08-21 21:30:22,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:22,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:30:22,094 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471552503] [2020-08-21 21:30:22,095 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:30:22,095 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:22,095 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:30:22,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:30:22,096 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-21 21:30:22,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:22,349 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-21 21:30:22,350 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:30:22,350 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-21 21:30:22,350 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:22,351 INFO L225 Difference]: With dead ends: 56 [2020-08-21 21:30:22,351 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:30:22,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:30:22,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:30:22,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 21:30:22,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 21:30:22,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-21 21:30:22,364 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-21 21:30:22,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:22,365 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-21 21:30:22,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:30:22,365 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-21 21:30:22,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 21:30:22,366 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:22,367 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:22,367 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:30:22,367 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:22,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:22,368 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-21 21:30:22,368 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:22,368 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [359547857] [2020-08-21 21:30:22,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:22,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:22,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:22,551 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:22,551 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [359547857] [2020-08-21 21:30:22,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:22,552 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:30:22,552 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083441534] [2020-08-21 21:30:22,552 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:30:22,552 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:22,553 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:30:22,553 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:30:22,553 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-21 21:30:22,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:22,849 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-21 21:30:22,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:30:22,850 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-21 21:30:22,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:22,851 INFO L225 Difference]: With dead ends: 57 [2020-08-21 21:30:22,851 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 21:30:22,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:30:22,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 21:30:22,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 21:30:22,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:30:22,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-21 21:30:22,858 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-21 21:30:22,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:22,858 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-21 21:30:22,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:30:22,858 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-21 21:30:22,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:30:22,859 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:22,859 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:22,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:30:22,860 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:22,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:22,860 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-21 21:30:22,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:22,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [242764221] [2020-08-21 21:30:22,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:22,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:23,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,007 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:23,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [242764221] [2020-08-21 21:30:23,010 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:23,010 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:30:23,010 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255550744] [2020-08-21 21:30:23,011 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:30:23,011 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:23,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:30:23,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:30:23,012 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-21 21:30:23,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:23,392 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-21 21:30:23,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:30:23,392 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 21:30:23,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:23,393 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:30:23,393 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:30:23,394 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:30:23,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:30:23,399 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 21:30:23,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 21:30:23,400 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-21 21:30:23,401 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-21 21:30:23,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:23,401 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-21 21:30:23,401 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:30:23,401 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-21 21:30:23,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 21:30:23,402 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:23,402 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:23,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:30:23,403 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:23,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:23,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-21 21:30:23,403 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:23,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [125940787] [2020-08-21 21:30:23,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:23,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:23,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:23,579 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:23,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [125940787] [2020-08-21 21:30:23,580 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:23,580 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:30:23,580 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [562294948] [2020-08-21 21:30:23,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:30:23,581 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:23,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:30:23,582 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:30:23,582 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-21 21:30:23,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:23,977 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-21 21:30:23,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:30:23,978 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 21:30:23,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:23,979 INFO L225 Difference]: With dead ends: 59 [2020-08-21 21:30:23,979 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 21:30:23,980 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:30:23,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 21:30:23,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 21:30:23,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:30:23,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-21 21:30:23,987 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-21 21:30:23,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:23,987 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-21 21:30:23,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:30:23,987 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-21 21:30:23,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:30:23,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:23,988 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:23,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:30:23,989 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:23,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:23,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-21 21:30:23,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:23,989 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [259402617] [2020-08-21 21:30:23,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:23,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:24,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,177 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:24,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [259402617] [2020-08-21 21:30:24,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:24,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:30:24,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [724668553] [2020-08-21 21:30:24,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:30:24,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:24,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:30:24,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:30:24,180 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-21 21:30:24,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:24,630 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-21 21:30:24,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:30:24,631 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-21 21:30:24,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:24,631 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:30:24,631 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:30:24,633 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:30:24,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:30:24,639 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-21 21:30:24,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 21:30:24,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-21 21:30:24,640 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-21 21:30:24,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:24,641 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-21 21:30:24,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:30:24,641 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-21 21:30:24,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 21:30:24,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:24,642 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:24,642 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:30:24,642 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:24,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:24,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-21 21:30:24,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:24,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2011197226] [2020-08-21 21:30:24,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:24,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:24,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:24,843 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:24,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2011197226] [2020-08-21 21:30:24,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:24,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:30:24,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1371846761] [2020-08-21 21:30:24,844 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:30:24,845 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:24,845 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:30:24,845 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:30:24,845 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-21 21:30:25,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:25,349 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-21 21:30:25,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:30:25,355 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-21 21:30:25,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:25,356 INFO L225 Difference]: With dead ends: 61 [2020-08-21 21:30:25,356 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 21:30:25,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:30:25,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 21:30:25,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 21:30:25,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:30:25,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-21 21:30:25,364 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-21 21:30:25,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:25,365 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-21 21:30:25,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:30:25,365 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-21 21:30:25,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 21:30:25,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:25,365 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:25,366 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:30:25,366 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:25,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:25,366 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-21 21:30:25,367 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:25,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280491457] [2020-08-21 21:30:25,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:25,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:25,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:25,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:25,568 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:25,569 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280491457] [2020-08-21 21:30:25,569 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:25,569 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:30:25,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357626517] [2020-08-21 21:30:25,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:30:25,570 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:25,570 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:30:25,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:30:25,570 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-21 21:30:26,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:26,143 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-21 21:30:26,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:30:26,149 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 21:30:26,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:26,150 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:30:26,150 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 21:30:26,151 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:30:26,151 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 21:30:26,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 21:30:26,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 21:30:26,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-21 21:30:26,157 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-21 21:30:26,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:26,157 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-21 21:30:26,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:30:26,158 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-21 21:30:26,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 21:30:26,158 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:26,158 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:26,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:30:26,159 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:26,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:26,159 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-21 21:30:26,159 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:26,160 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70659346] [2020-08-21 21:30:26,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:26,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:26,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:26,385 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:26,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70659346] [2020-08-21 21:30:26,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:26,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:30:26,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796003233] [2020-08-21 21:30:26,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:30:26,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:26,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:30:26,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:30:26,387 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-21 21:30:27,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:27,036 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-21 21:30:27,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:30:27,037 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-21 21:30:27,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:27,038 INFO L225 Difference]: With dead ends: 63 [2020-08-21 21:30:27,038 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 21:30:27,038 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:30:27,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 21:30:27,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-21 21:30:27,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:30:27,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-21 21:30:27,044 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-21 21:30:27,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:27,045 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-21 21:30:27,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:30:27,045 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-21 21:30:27,045 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 21:30:27,045 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:27,045 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:27,045 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:30:27,046 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:27,046 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:27,046 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-21 21:30:27,046 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:27,046 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1303994818] [2020-08-21 21:30:27,046 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:27,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:27,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:27,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:27,316 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:27,317 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1303994818] [2020-08-21 21:30:27,318 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:27,318 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:30:27,318 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037759648] [2020-08-21 21:30:27,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:30:27,319 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:27,319 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:30:27,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:30:27,319 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-21 21:30:28,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:28,032 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-21 21:30:28,034 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:30:28,035 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-21 21:30:28,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:28,035 INFO L225 Difference]: With dead ends: 64 [2020-08-21 21:30:28,035 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 21:30:28,036 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:30:28,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 21:30:28,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 21:30:28,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 21:30:28,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-21 21:30:28,042 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-21 21:30:28,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:28,043 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-21 21:30:28,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:30:28,043 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-21 21:30:28,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 21:30:28,043 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:28,044 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:28,044 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:30:28,044 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:28,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:28,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-21 21:30:28,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:28,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [872436982] [2020-08-21 21:30:28,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:28,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:28,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:28,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:28,324 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:28,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [872436982] [2020-08-21 21:30:28,324 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:28,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:30:28,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821873538] [2020-08-21 21:30:28,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:30:28,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:28,325 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:30:28,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:30:28,326 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-21 21:30:29,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:29,091 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-21 21:30:29,092 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:30:29,092 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-21 21:30:29,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:29,093 INFO L225 Difference]: With dead ends: 65 [2020-08-21 21:30:29,093 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 21:30:29,094 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:30:29,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 21:30:29,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 21:30:29,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 21:30:29,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-21 21:30:29,101 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-21 21:30:29,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:29,102 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-21 21:30:29,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:30:29,102 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-21 21:30:29,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:30:29,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:29,103 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:29,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:30:29,103 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:29,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:29,103 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-21 21:30:29,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:29,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370552531] [2020-08-21 21:30:29,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:29,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:29,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:29,419 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:29,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370552531] [2020-08-21 21:30:29,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:29,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:30:29,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835605163] [2020-08-21 21:30:29,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:30:29,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:29,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:30:29,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:30:29,422 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-21 21:30:30,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:30,298 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 21:30:30,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:30:30,300 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-21 21:30:30,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:30,301 INFO L225 Difference]: With dead ends: 66 [2020-08-21 21:30:30,301 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:30:30,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:30:30,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:30:30,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-21 21:30:30,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 21:30:30,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-21 21:30:30,310 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-21 21:30:30,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:30,310 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-21 21:30:30,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:30:30,310 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-21 21:30:30,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 21:30:30,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:30,311 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:30,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:30:30,311 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:30,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:30,312 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-21 21:30:30,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:30,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1648116971] [2020-08-21 21:30:30,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:30,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:30,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:30,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:30,656 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:30,656 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1648116971] [2020-08-21 21:30:30,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:30,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:30:30,657 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624249228] [2020-08-21 21:30:30,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:30:30,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:30,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:30:30,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:30:30,658 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-21 21:30:31,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:31,645 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-21 21:30:31,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:30:31,646 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-21 21:30:31,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:31,646 INFO L225 Difference]: With dead ends: 67 [2020-08-21 21:30:31,646 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 21:30:31,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:30:31,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 21:30:31,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-21 21:30:31,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 21:30:31,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-21 21:30:31,659 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-21 21:30:31,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:31,660 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-21 21:30:31,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:30:31,660 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-21 21:30:31,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 21:30:31,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:31,661 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:31,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:30:31,661 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:31,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:31,662 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-21 21:30:31,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:31,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1692222784] [2020-08-21 21:30:31,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:31,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:32,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:32,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:32,042 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:32,043 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1692222784] [2020-08-21 21:30:32,043 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:32,043 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:30:32,044 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565252207] [2020-08-21 21:30:32,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:30:32,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:32,047 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:30:32,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:30:32,048 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-21 21:30:33,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:33,089 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-21 21:30:33,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:30:33,091 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-21 21:30:33,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:33,092 INFO L225 Difference]: With dead ends: 68 [2020-08-21 21:30:33,092 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 21:30:33,093 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:30:33,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 21:30:33,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 21:30:33,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 21:30:33,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-21 21:30:33,100 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-21 21:30:33,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:33,100 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-21 21:30:33,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:30:33,101 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-21 21:30:33,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 21:30:33,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:33,101 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:33,101 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:30:33,102 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:33,102 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:33,102 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-21 21:30:33,102 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:33,102 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179994286] [2020-08-21 21:30:33,102 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:33,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:33,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:33,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:33,521 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-21 21:30:33,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179994286] [2020-08-21 21:30:33,521 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:30:33,521 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:30:33,522 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1292525942] [2020-08-21 21:30:33,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:30:33,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:33,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:30:33,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:30:33,527 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-21 21:30:34,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:34,702 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-21 21:30:34,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:30:34,703 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-21 21:30:34,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:34,704 INFO L225 Difference]: With dead ends: 69 [2020-08-21 21:30:34,704 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 21:30:34,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 21:30:34,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 21:30:34,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 21:30:34,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:30:34,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-21 21:30:34,712 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-21 21:30:34,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:34,712 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-21 21:30:34,713 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:30:34,713 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-21 21:30:34,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:30:34,713 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:30:34,713 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:30:34,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:30:34,713 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:30:34,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:30:34,714 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-21 21:30:34,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:30:34,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473285336] [2020-08-21 21:30:34,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:30:34,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:30:34,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:30:34,768 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-21 21:30:34,768 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473285336] [2020-08-21 21:30:34,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:30:34,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 21:30:34,769 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782309899] [2020-08-21 21:30:34,769 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:30:34,769 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:30:34,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:30:34,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:30:34,769 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-21 21:30:34,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:30:34,791 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-21 21:30:34,791 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:30:34,792 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-21 21:30:34,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:30:34,792 INFO L225 Difference]: With dead ends: 66 [2020-08-21 21:30:34,792 INFO L226 Difference]: Without dead ends: 0 [2020-08-21 21:30:34,793 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:30:34,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-21 21:30:34,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-21 21:30:34,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-21 21:30:34,793 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-21 21:30:34,794 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-21 21:30:34,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:30:34,794 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-21 21:30:34,794 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:30:34,794 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-21 21:30:34,794 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-21 21:30:34,794 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:30:34,797 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-21 21:30:35,021 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-21 21:30:35,021 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-21 21:30:35,021 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-21 21:30:35,022 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-21 21:30:35,022 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-21 21:30:35,022 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-21 21:30:35,022 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-21 21:30:35,022 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-21 21:30:35,022 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-21 21:30:35,022 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-21 21:30:35,022 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-21 21:30:35,022 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-21 21:30:35,023 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-21 21:30:35,023 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-21 21:30:35,023 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 21:30:35,023 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-21 21:30:35,023 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-21 21:30:35,023 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-21 21:30:35,023 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-21 21:30:35,024 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-21 21:30:35,024 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-21 21:30:35,024 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-21 21:30:35,024 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-21 21:30:35,024 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-21 21:30:35,025 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-21 21:30:35,053 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 09:30:35 BoogieIcfgContainer [2020-08-21 21:30:35,053 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 21:30:35,056 INFO L168 Benchmark]: Toolchain (without parser) took 16271.48 ms. Allocated memory was 138.9 MB in the beginning and 376.4 MB in the end (delta: 237.5 MB). Free memory was 102.0 MB in the beginning and 118.2 MB in the end (delta: -16.2 MB). Peak memory consumption was 221.3 MB. Max. memory is 7.1 GB. [2020-08-21 21:30:35,059 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.0 MB in the end (delta: 419.6 kB). Peak memory consumption was 419.6 kB. Max. memory is 7.1 GB. [2020-08-21 21:30:35,060 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.37 ms. Allocated memory is still 138.9 MB. Free memory was 101.6 MB in the beginning and 92.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-21 21:30:35,066 INFO L168 Benchmark]: Boogie Preprocessor took 97.85 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 92.1 MB in the beginning and 180.1 MB in the end (delta: -88.0 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-08-21 21:30:35,067 INFO L168 Benchmark]: RCFGBuilder took 301.61 ms. Allocated memory is still 201.3 MB. Free memory was 179.7 MB in the beginning and 166.7 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-08-21 21:30:35,070 INFO L168 Benchmark]: TraceAbstraction took 15616.87 ms. Allocated memory was 201.3 MB in the beginning and 376.4 MB in the end (delta: 175.1 MB). Free memory was 166.7 MB in the beginning and 118.2 MB in the end (delta: 48.5 MB). Peak memory consumption was 223.6 MB. Max. memory is 7.1 GB. [2020-08-21 21:30:35,073 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 138.9 MB. Free memory was 120.5 MB in the beginning and 120.0 MB in the end (delta: 419.6 kB). Peak memory consumption was 419.6 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 246.37 ms. Allocated memory is still 138.9 MB. Free memory was 101.6 MB in the beginning and 92.1 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 97.85 ms. Allocated memory was 138.9 MB in the beginning and 201.3 MB in the end (delta: 62.4 MB). Free memory was 92.1 MB in the beginning and 180.1 MB in the end (delta: -88.0 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 301.61 ms. Allocated memory is still 201.3 MB. Free memory was 179.7 MB in the beginning and 166.7 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15616.87 ms. Allocated memory was 201.3 MB in the beginning and 376.4 MB in the end (delta: 175.1 MB). Free memory was 166.7 MB in the beginning and 118.2 MB in the end (delta: 48.5 MB). Peak memory consumption was 223.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.2s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.2s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.1s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 4.0s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...