/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=WIDEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_o20.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 22:10:24,656 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 22:10:24,686 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 22:10:24,687 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 22:10:24,689 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 22:10:24,691 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 22:10:24,693 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 22:10:24,694 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 22:10:24,695 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 22:10:24,697 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 22:10:24,697 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 22:10:24,698 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 22:10:24,699 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 22:10:24,701 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 22:10:24,702 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 22:10:24,704 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 22:10:24,708 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 22:10:24,712 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 22:10:24,714 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 22:10:24,718 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 22:10:24,721 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 22:10:24,722 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 22:10:24,727 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 22:10:24,741 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 22:10:24,742 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 22:10:24,744 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 22:10:24,745 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 22:10:24,807 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 22:10:24,810 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 22:10:24,812 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 22:10:24,812 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 22:10:24,812 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 22:10:24,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 22:10:24,812 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 22:10:24,814 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 22:10:24,814 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 22:10:24,814 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 22:10:24,815 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 22:10:24,815 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 22:10:24,815 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 22:10:24,815 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 22:10:24,815 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 22:10:24,815 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 22:10:24,817 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 22:10:24,817 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 22:10:24,817 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 22:10:24,818 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 22:10:24,818 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 22:10:24,818 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 22:10:24,818 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 22:10:24,818 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 22:10:24,818 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 22:10:24,819 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 22:10:24,819 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 22:10:24,819 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 22:10:24,820 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 22:10:24,820 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=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=WIDEST;log-additional-information=true; [2020-08-21 22:10:25,212 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 22:10:25,229 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 22:10:25,233 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 22:10:25,234 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 22:10:25,235 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 22:10:25,235 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o20.c [2020-08-21 22:10:25,300 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/69e1d877e/36aa81a543b940aa8e5cea089edbea60/FLAGbdbd8ce6c [2020-08-21 22:10:25,782 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 22:10:25,783 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_o20.c [2020-08-21 22:10:25,790 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/69e1d877e/36aa81a543b940aa8e5cea089edbea60/FLAGbdbd8ce6c [2020-08-21 22:10:26,170 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/69e1d877e/36aa81a543b940aa8e5cea089edbea60 [2020-08-21 22:10:26,179 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 22:10:26,181 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 22:10:26,182 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 22:10:26,182 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 22:10:26,186 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 22:10:26,187 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,190 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6faa959a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26, skipping insertion in model container [2020-08-21 22:10:26,190 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,198 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 22:10:26,218 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 22:10:26,391 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:10:26,394 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 22:10:26,406 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 22:10:26,418 INFO L208 MainTranslator]: Completed translation [2020-08-21 22:10:26,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26 WrapperNode [2020-08-21 22:10:26,419 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 22:10:26,420 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 22:10:26,420 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 22:10:26,420 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 22:10:26,430 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,430 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,518 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,518 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,523 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,526 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,527 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (1/1) ... [2020-08-21 22:10:26,528 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 22:10:26,529 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 22:10:26,529 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 22:10:26,529 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 22:10:26,530 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (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 22:10:26,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 22:10:26,583 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 22:10:26,583 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-08-21 22:10:26,589 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 22:10:26,589 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-08-21 22:10:26,589 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 22:10:26,589 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-08-21 22:10:26,589 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 22:10:26,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 22:10:26,590 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 22:10:26,757 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 22:10:26,757 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 22:10:26,761 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:10:26 BoogieIcfgContainer [2020-08-21 22:10:26,761 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 22:10:26,763 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 22:10:26,763 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 22:10:26,766 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 22:10:26,766 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 10:10:26" (1/3) ... [2020-08-21 22:10:26,767 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43d3a052 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:10:26, skipping insertion in model container [2020-08-21 22:10:26,767 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 10:10:26" (2/3) ... [2020-08-21 22:10:26,768 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43d3a052 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 10:10:26, skipping insertion in model container [2020-08-21 22:10:26,768 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 10:10:26" (3/3) ... [2020-08-21 22:10:26,769 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o20.c [2020-08-21 22:10:26,780 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 22:10:26,788 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 22:10:26,802 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 22:10:26,828 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 22:10:26,828 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 22:10:26,829 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 22:10:26,829 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 22:10:26,829 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 22:10:26,829 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 22:10:26,829 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 22:10:26,829 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 22:10:26,849 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-08-21 22:10:26,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 22:10:26,855 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:26,857 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:26,857 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:26,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:26,863 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-08-21 22:10:26,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:26,872 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1077922968] [2020-08-21 22:10:26,872 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:26,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,208 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2020-08-21 22:10:27,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:27,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:27,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,296 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 22:10:27,300 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1077922968] [2020-08-21 22:10:27,303 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 22:10:27,303 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 22:10:27,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [36968491] [2020-08-21 22:10:27,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 22:10:27,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:27,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 22:10:27,330 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:10:27,333 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-08-21 22:10:27,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:27,386 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-08-21 22:10:27,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 22:10:27,388 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 22:10:27,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:27,400 INFO L225 Difference]: With dead ends: 32 [2020-08-21 22:10:27,401 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 22:10:27,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 22:10:27,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 22:10:27,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-21 22:10:27,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 22:10:27,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-08-21 22:10:27,457 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-08-21 22:10:27,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:27,458 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-08-21 22:10:27,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 22:10:27,459 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-08-21 22:10:27,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 22:10:27,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:27,461 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:27,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 22:10:27,462 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:27,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:27,463 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-08-21 22:10:27,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:27,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [331724013] [2020-08-21 22:10:27,464 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:27,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,584 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:27,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:27,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:27,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,698 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-21 22:10:27,699 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [331724013] [2020-08-21 22:10:27,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:27,700 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 22:10:27,701 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923551324] [2020-08-21 22:10:27,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 22:10:27,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:27,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 22:10:27,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:10:27,705 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 7 states. [2020-08-21 22:10:27,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:27,738 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-08-21 22:10:27,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 22:10:27,739 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2020-08-21 22:10:27,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:27,740 INFO L225 Difference]: With dead ends: 25 [2020-08-21 22:10:27,740 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 22:10:27,741 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 22:10:27,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 22:10:27,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 22:10:27,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 22:10:27,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-08-21 22:10:27,749 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-08-21 22:10:27,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:27,749 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-08-21 22:10:27,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 22:10:27,750 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-08-21 22:10:27,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 22:10:27,751 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:27,751 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:27,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 22:10:27,752 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:27,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:27,753 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-08-21 22:10:27,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:27,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1042893782] [2020-08-21 22:10:27,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:27,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:27,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:27,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:27,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:27,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:27,975 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-08-21 22:10:27,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1042893782] [2020-08-21 22:10:27,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:27,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 22:10:27,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289808169] [2020-08-21 22:10:27,978 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 22:10:27,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:27,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 22:10:27,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:10:27,979 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2020-08-21 22:10:28,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:28,021 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-08-21 22:10:28,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 22:10:28,022 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-21 22:10:28,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:28,024 INFO L225 Difference]: With dead ends: 28 [2020-08-21 22:10:28,024 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 22:10:28,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 22:10:28,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 22:10:28,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-08-21 22:10:28,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 22:10:28,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-08-21 22:10:28,032 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-08-21 22:10:28,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:28,033 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-08-21 22:10:28,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 22:10:28,033 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-08-21 22:10:28,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 22:10:28,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:28,035 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:28,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 22:10:28,035 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:28,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:28,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-08-21 22:10:28,036 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:28,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007302866] [2020-08-21 22:10:28,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:28,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:28,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:28,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:28,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:28,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,280 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:28,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,312 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-08-21 22:10:28,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007302866] [2020-08-21 22:10:28,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:28,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 22:10:28,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321592326] [2020-08-21 22:10:28,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 22:10:28,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:28,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 22:10:28,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:10:28,315 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 11 states. [2020-08-21 22:10:28,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:28,377 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-08-21 22:10:28,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 22:10:28,378 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 31 [2020-08-21 22:10:28,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:28,379 INFO L225 Difference]: With dead ends: 31 [2020-08-21 22:10:28,379 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 22:10:28,380 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 22:10:28,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 22:10:28,391 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-08-21 22:10:28,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 22:10:28,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-08-21 22:10:28,397 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-08-21 22:10:28,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:28,398 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-08-21 22:10:28,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 22:10:28,398 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-08-21 22:10:28,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 22:10:28,400 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:28,401 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:28,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 22:10:28,403 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:28,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:28,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-08-21 22:10:28,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:28,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1818230739] [2020-08-21 22:10:28,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:28,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:28,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:28,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:28,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:28,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,692 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:28,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:28,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,801 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-08-21 22:10:28,801 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1818230739] [2020-08-21 22:10:28,802 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:28,802 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 22:10:28,802 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2063458545] [2020-08-21 22:10:28,803 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 22:10:28,803 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:28,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 22:10:28,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:10:28,805 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 13 states. [2020-08-21 22:10:28,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:28,887 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-08-21 22:10:28,887 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 22:10:28,888 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2020-08-21 22:10:28,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:28,890 INFO L225 Difference]: With dead ends: 34 [2020-08-21 22:10:28,890 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 22:10:28,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 22:10:28,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 22:10:28,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-08-21 22:10:28,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 22:10:28,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-08-21 22:10:28,901 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-08-21 22:10:28,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:28,904 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-08-21 22:10:28,904 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 22:10:28,904 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-08-21 22:10:28,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 22:10:28,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:28,906 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:28,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 22:10:28,906 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:28,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:28,909 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-08-21 22:10:28,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:28,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [34493991] [2020-08-21 22:10:28,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:28,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:28,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:28,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:28,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,252 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-08-21 22:10:29,252 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [34493991] [2020-08-21 22:10:29,252 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:29,253 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 22:10:29,253 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [432832445] [2020-08-21 22:10:29,254 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 22:10:29,254 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:29,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 22:10:29,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:10:29,255 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 15 states. [2020-08-21 22:10:29,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:29,353 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-08-21 22:10:29,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 22:10:29,353 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 43 [2020-08-21 22:10:29,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:29,355 INFO L225 Difference]: With dead ends: 37 [2020-08-21 22:10:29,355 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 22:10:29,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 22:10:29,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 22:10:29,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-21 22:10:29,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 22:10:29,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-08-21 22:10:29,362 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-08-21 22:10:29,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:29,363 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-08-21 22:10:29,363 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 22:10:29,363 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-08-21 22:10:29,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 22:10:29,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:29,365 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:29,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 22:10:29,366 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:29,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:29,366 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-08-21 22:10:29,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:29,367 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753328311] [2020-08-21 22:10:29,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:29,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:29,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:29,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,577 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,622 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,669 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,703 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-08-21 22:10:29,704 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [753328311] [2020-08-21 22:10:29,704 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:29,704 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 22:10:29,705 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582551784] [2020-08-21 22:10:29,705 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 22:10:29,705 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:29,706 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 22:10:29,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:10:29,706 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 17 states. [2020-08-21 22:10:29,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:29,822 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-08-21 22:10:29,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 22:10:29,823 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 49 [2020-08-21 22:10:29,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:29,824 INFO L225 Difference]: With dead ends: 40 [2020-08-21 22:10:29,825 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 22:10:29,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 22:10:29,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 22:10:29,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-21 22:10:29,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 22:10:29,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-08-21 22:10:29,832 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-08-21 22:10:29,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:29,833 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-08-21 22:10:29,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 22:10:29,833 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-08-21 22:10:29,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 22:10:29,834 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:29,834 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:29,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 22:10:29,835 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:29,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:29,835 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-08-21 22:10:29,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:29,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1590087278] [2020-08-21 22:10:29,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:29,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:29,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:29,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:29,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:29,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,185 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,304 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-08-21 22:10:30,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1590087278] [2020-08-21 22:10:30,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:30,305 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 22:10:30,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316379287] [2020-08-21 22:10:30,306 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 22:10:30,306 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:30,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 22:10:30,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:10:30,307 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 19 states. [2020-08-21 22:10:30,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:30,455 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-08-21 22:10:30,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 22:10:30,456 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 55 [2020-08-21 22:10:30,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:30,457 INFO L225 Difference]: With dead ends: 43 [2020-08-21 22:10:30,458 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 22:10:30,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 22:10:30,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 22:10:30,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-21 22:10:30,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 22:10:30,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-08-21 22:10:30,465 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-08-21 22:10:30,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:30,466 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-08-21 22:10:30,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 22:10:30,466 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-08-21 22:10:30,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 22:10:30,467 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:30,467 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:30,468 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 22:10:30,468 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:30,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:30,468 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-08-21 22:10:30,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:30,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [676684075] [2020-08-21 22:10:30,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:30,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:30,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,523 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:30,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,569 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,613 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:30,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:30,999 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-08-21 22:10:31,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [676684075] [2020-08-21 22:10:31,000 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:31,000 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 22:10:31,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390493382] [2020-08-21 22:10:31,001 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 22:10:31,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:31,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 22:10:31,002 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:10:31,002 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 21 states. [2020-08-21 22:10:31,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:31,186 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-08-21 22:10:31,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 22:10:31,187 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 61 [2020-08-21 22:10:31,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:31,188 INFO L225 Difference]: With dead ends: 46 [2020-08-21 22:10:31,189 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 22:10:31,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 22:10:31,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 22:10:31,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-21 22:10:31,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 22:10:31,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-08-21 22:10:31,203 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-08-21 22:10:31,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:31,204 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-08-21 22:10:31,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 22:10:31,204 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-08-21 22:10:31,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 22:10:31,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:31,208 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:31,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 22:10:31,208 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:31,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:31,210 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-08-21 22:10:31,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:31,210 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [664384236] [2020-08-21 22:10:31,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:31,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:31,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:31,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,425 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,476 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:31,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:31,964 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-08-21 22:10:31,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [664384236] [2020-08-21 22:10:31,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:31,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 22:10:31,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [382535093] [2020-08-21 22:10:31,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 22:10:31,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:31,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 22:10:31,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:10:31,968 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 23 states. [2020-08-21 22:10:32,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:32,180 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-08-21 22:10:32,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 22:10:32,180 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 67 [2020-08-21 22:10:32,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:32,182 INFO L225 Difference]: With dead ends: 49 [2020-08-21 22:10:32,182 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 22:10:32,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 22:10:32,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 22:10:32,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-21 22:10:32,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 22:10:32,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-08-21 22:10:32,189 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-08-21 22:10:32,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:32,190 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-08-21 22:10:32,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 22:10:32,190 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-08-21 22:10:32,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 22:10:32,191 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:32,191 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:32,191 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 22:10:32,192 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:32,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:32,192 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-08-21 22:10:32,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:32,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [617547093] [2020-08-21 22:10:32,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:32,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:32,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:32,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:32,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:32,865 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-08-21 22:10:32,865 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [617547093] [2020-08-21 22:10:32,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:32,866 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 22:10:32,866 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [80235896] [2020-08-21 22:10:32,868 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 22:10:32,868 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:32,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 22:10:32,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:10:32,869 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 25 states. [2020-08-21 22:10:33,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:33,111 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-08-21 22:10:33,111 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 22:10:33,112 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 73 [2020-08-21 22:10:33,112 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:33,113 INFO L225 Difference]: With dead ends: 52 [2020-08-21 22:10:33,113 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 22:10:33,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 22:10:33,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 22:10:33,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-21 22:10:33,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 22:10:33,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-08-21 22:10:33,120 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-08-21 22:10:33,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:33,121 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-08-21 22:10:33,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 22:10:33,121 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-08-21 22:10:33,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 22:10:33,122 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:33,122 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:33,122 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 22:10:33,123 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:33,123 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:33,123 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-08-21 22:10:33,123 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:33,124 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775585989] [2020-08-21 22:10:33,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:33,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:33,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,497 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,850 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:33,938 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:33,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,007 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-08-21 22:10:34,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775585989] [2020-08-21 22:10:34,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:34,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 22:10:34,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382115005] [2020-08-21 22:10:34,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 22:10:34,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:34,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 22:10:34,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:10:34,010 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 27 states. [2020-08-21 22:10:34,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:34,311 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-08-21 22:10:34,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 22:10:34,312 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 79 [2020-08-21 22:10:34,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:34,313 INFO L225 Difference]: With dead ends: 55 [2020-08-21 22:10:34,313 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 22:10:34,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-08-21 22:10:34,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 22:10:34,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-08-21 22:10:34,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 22:10:34,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-08-21 22:10:34,320 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-08-21 22:10:34,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:34,321 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-08-21 22:10:34,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 22:10:34,321 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-08-21 22:10:34,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 22:10:34,322 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:34,322 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:34,323 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 22:10:34,323 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:34,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:34,323 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-08-21 22:10:34,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:34,324 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1070314153] [2020-08-21 22:10:34,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:34,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:34,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,383 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:34,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,731 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,788 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,859 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,920 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:34,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:34,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:35,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:35,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,220 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-08-21 22:10:35,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1070314153] [2020-08-21 22:10:35,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:35,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 22:10:35,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130735012] [2020-08-21 22:10:35,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 22:10:35,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:35,223 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 22:10:35,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:10:35,224 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 29 states. [2020-08-21 22:10:35,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:35,566 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-08-21 22:10:35,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 22:10:35,567 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 85 [2020-08-21 22:10:35,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:35,568 INFO L225 Difference]: With dead ends: 58 [2020-08-21 22:10:35,568 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 22:10:35,571 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=55, Invalid=757, Unknown=0, NotChecked=0, Total=812 [2020-08-21 22:10:35,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 22:10:35,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-08-21 22:10:35,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 22:10:35,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-08-21 22:10:35,584 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-08-21 22:10:35,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:35,587 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-08-21 22:10:35,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 22:10:35,588 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-08-21 22:10:35,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 22:10:35,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:35,589 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:35,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 22:10:35,589 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:35,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:35,590 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-08-21 22:10:35,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:35,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1119915096] [2020-08-21 22:10:35,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:35,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:35,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:35,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:35,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:35,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:35,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:35,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:35,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,107 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,227 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,357 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,589 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:36,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:36,691 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-08-21 22:10:36,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1119915096] [2020-08-21 22:10:36,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:36,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 22:10:36,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2046847292] [2020-08-21 22:10:36,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 22:10:36,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:36,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 22:10:36,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:10:36,694 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 31 states. [2020-08-21 22:10:37,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:37,079 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-08-21 22:10:37,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 22:10:37,080 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 91 [2020-08-21 22:10:37,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:37,081 INFO L225 Difference]: With dead ends: 61 [2020-08-21 22:10:37,081 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 22:10:37,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=59, Invalid=871, Unknown=0, NotChecked=0, Total=930 [2020-08-21 22:10:37,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 22:10:37,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-08-21 22:10:37,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 22:10:37,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-08-21 22:10:37,088 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-08-21 22:10:37,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:37,089 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-08-21 22:10:37,089 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 22:10:37,089 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-08-21 22:10:37,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-08-21 22:10:37,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:37,090 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:37,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 22:10:37,091 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:37,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:37,091 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-08-21 22:10:37,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:37,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807491826] [2020-08-21 22:10:37,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:37,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:37,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:37,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,391 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,699 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,764 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:37,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:37,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:38,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:38,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,283 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-08-21 22:10:38,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807491826] [2020-08-21 22:10:38,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:38,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 22:10:38,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1162171883] [2020-08-21 22:10:38,287 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 22:10:38,287 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:38,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 22:10:38,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:10:38,289 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 33 states. [2020-08-21 22:10:38,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:38,702 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-08-21 22:10:38,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 22:10:38,702 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 97 [2020-08-21 22:10:38,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:38,703 INFO L225 Difference]: With dead ends: 64 [2020-08-21 22:10:38,704 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 22:10:38,705 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=63, Invalid=993, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 22:10:38,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 22:10:38,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-08-21 22:10:38,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 22:10:38,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-08-21 22:10:38,711 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-08-21 22:10:38,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:38,712 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-08-21 22:10:38,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 22:10:38,712 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-08-21 22:10:38,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-08-21 22:10:38,713 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:38,713 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:38,713 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 22:10:38,713 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:38,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:38,714 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-08-21 22:10:38,714 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:38,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470917897] [2020-08-21 22:10:38,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:38,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:38,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:38,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:38,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:38,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:38,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:38,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,025 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:39,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:39,887 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-08-21 22:10:39,887 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470917897] [2020-08-21 22:10:39,887 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:39,888 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 22:10:39,888 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001083434] [2020-08-21 22:10:39,888 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 22:10:39,889 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:39,889 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 22:10:39,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:10:39,890 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 35 states. [2020-08-21 22:10:40,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:40,396 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-08-21 22:10:40,396 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 22:10:40,397 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 103 [2020-08-21 22:10:40,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:40,400 INFO L225 Difference]: With dead ends: 67 [2020-08-21 22:10:40,400 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 22:10:40,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=67, Invalid=1123, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 22:10:40,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 22:10:40,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-08-21 22:10:40,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 22:10:40,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-08-21 22:10:40,415 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2020-08-21 22:10:40,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:40,415 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-08-21 22:10:40,415 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 22:10:40,416 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-08-21 22:10:40,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 22:10:40,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:40,420 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:40,420 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 22:10:40,420 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:40,420 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:40,420 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2020-08-21 22:10:40,423 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:40,423 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [85571224] [2020-08-21 22:10:40,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:40,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:40,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:40,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:40,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:40,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:40,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:40,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:40,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:40,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:40,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:40,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,200 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:41,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:41,823 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-08-21 22:10:41,824 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [85571224] [2020-08-21 22:10:41,824 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:41,824 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 22:10:41,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [748395202] [2020-08-21 22:10:41,825 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 22:10:41,825 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:41,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 22:10:41,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:10:41,826 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 37 states. [2020-08-21 22:10:42,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:42,439 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2020-08-21 22:10:42,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 22:10:42,439 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 109 [2020-08-21 22:10:42,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:42,441 INFO L225 Difference]: With dead ends: 70 [2020-08-21 22:10:42,441 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 22:10:42,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=71, Invalid=1261, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 22:10:42,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 22:10:42,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-08-21 22:10:42,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 22:10:42,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2020-08-21 22:10:42,448 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2020-08-21 22:10:42,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:42,448 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2020-08-21 22:10:42,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 22:10:42,449 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2020-08-21 22:10:42,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-08-21 22:10:42,450 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:42,450 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:42,450 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 22:10:42,450 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:42,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:42,451 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2020-08-21 22:10:42,451 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:42,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [621790029] [2020-08-21 22:10:42,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:42,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:42,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:42,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:42,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:42,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:42,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:42,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:42,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:42,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:42,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:42,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,096 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,351 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,658 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:43,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:43,998 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2020-08-21 22:10:43,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [621790029] [2020-08-21 22:10:43,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:43,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 22:10:43,999 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7533194] [2020-08-21 22:10:44,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 22:10:44,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:44,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 22:10:44,012 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:10:44,012 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 39 states. [2020-08-21 22:10:44,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:44,663 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2020-08-21 22:10:44,663 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 22:10:44,663 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 115 [2020-08-21 22:10:44,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:44,664 INFO L225 Difference]: With dead ends: 73 [2020-08-21 22:10:44,665 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 22:10:44,666 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=75, Invalid=1407, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 22:10:44,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 22:10:44,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-08-21 22:10:44,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 22:10:44,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-08-21 22:10:44,672 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2020-08-21 22:10:44,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:44,672 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-08-21 22:10:44,673 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 22:10:44,673 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-08-21 22:10:44,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-08-21 22:10:44,674 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:44,674 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:44,674 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 22:10:44,674 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:44,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:44,675 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2020-08-21 22:10:44,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:44,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650696692] [2020-08-21 22:10:44,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:44,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:44,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:44,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:44,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:44,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:44,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:44,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:44,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:44,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:44,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:44,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:44,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,329 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,498 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,568 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,667 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,755 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,849 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:45,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:45,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:46,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:46,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:46,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:46,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:46,400 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2020-08-21 22:10:46,400 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650696692] [2020-08-21 22:10:46,400 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:46,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 22:10:46,401 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [412802556] [2020-08-21 22:10:46,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 22:10:46,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:46,403 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 22:10:46,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:10:46,403 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 41 states. [2020-08-21 22:10:47,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:47,157 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2020-08-21 22:10:47,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 22:10:47,158 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 121 [2020-08-21 22:10:47,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:47,160 INFO L225 Difference]: With dead ends: 76 [2020-08-21 22:10:47,160 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 22:10:47,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=79, Invalid=1561, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 22:10:47,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 22:10:47,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-08-21 22:10:47,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 22:10:47,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2020-08-21 22:10:47,166 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2020-08-21 22:10:47,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:47,166 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2020-08-21 22:10:47,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 22:10:47,166 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2020-08-21 22:10:47,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-08-21 22:10:47,167 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:47,167 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:47,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 22:10:47,168 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:47,168 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:47,168 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2020-08-21 22:10:47,168 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:47,169 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075367208] [2020-08-21 22:10:47,169 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:47,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,250 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 22:10:47,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,251 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 22:10:47,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,325 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:47,932 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:47,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,008 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,507 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-08-21 22:10:48,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 22:10:48,997 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-08-21 22:10:48,998 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075367208] [2020-08-21 22:10:48,998 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 22:10:48,998 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 22:10:48,998 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [79524360] [2020-08-21 22:10:48,998 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 22:10:48,999 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 22:10:48,999 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 22:10:48,999 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:10:48,999 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 43 states. [2020-08-21 22:10:49,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 22:10:49,812 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2020-08-21 22:10:49,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 22:10:49,813 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 127 [2020-08-21 22:10:49,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 22:10:49,814 INFO L225 Difference]: With dead ends: 79 [2020-08-21 22:10:49,814 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 22:10:49,815 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=83, Invalid=1723, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 22:10:49,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 22:10:49,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-08-21 22:10:49,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 22:10:49,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2020-08-21 22:10:49,819 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2020-08-21 22:10:49,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 22:10:49,820 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2020-08-21 22:10:49,820 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 22:10:49,820 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2020-08-21 22:10:49,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-08-21 22:10:49,822 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 22:10:49,822 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 22:10:49,822 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 22:10:49,822 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 22:10:49,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 22:10:49,823 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2020-08-21 22:10:49,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 22:10:49,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1761636593] [2020-08-21 22:10:49,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 22:10:49,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 22:10:49,932 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 22:10:49,932 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 22:10:49,940 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 22:10:49,995 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 10:10:49 BoogieIcfgContainer [2020-08-21 22:10:49,995 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 22:10:50,002 INFO L168 Benchmark]: Toolchain (without parser) took 23815.90 ms. Allocated memory was 138.9 MB in the beginning and 504.4 MB in the end (delta: 365.4 MB). Free memory was 100.7 MB in the beginning and 320.1 MB in the end (delta: -219.4 MB). Peak memory consumption was 146.0 MB. Max. memory is 7.1 GB. [2020-08-21 22:10:50,002 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 138.9 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-21 22:10:50,004 INFO L168 Benchmark]: CACSL2BoogieTranslator took 237.29 ms. Allocated memory is still 138.9 MB. Free memory was 100.2 MB in the beginning and 91.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. [2020-08-21 22:10:50,007 INFO L168 Benchmark]: Boogie Preprocessor took 108.47 ms. Allocated memory was 138.9 MB in the beginning and 200.3 MB in the end (delta: 61.3 MB). Free memory was 91.1 MB in the beginning and 179.0 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. [2020-08-21 22:10:50,007 INFO L168 Benchmark]: RCFGBuilder took 232.67 ms. Allocated memory is still 200.3 MB. Free memory was 178.4 MB in the beginning and 167.8 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. [2020-08-21 22:10:50,008 INFO L168 Benchmark]: TraceAbstraction took 23232.27 ms. Allocated memory was 200.3 MB in the beginning and 504.4 MB in the end (delta: 304.1 MB). Free memory was 167.2 MB in the beginning and 320.1 MB in the end (delta: -152.9 MB). Peak memory consumption was 151.2 MB. Max. memory is 7.1 GB. [2020-08-21 22:10:50,013 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 138.9 MB. Free memory was 119.2 MB in the beginning and 119.0 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 237.29 ms. Allocated memory is still 138.9 MB. Free memory was 100.2 MB in the beginning and 91.1 MB in the end (delta: 9.2 MB). Peak memory consumption was 9.2 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 108.47 ms. Allocated memory was 138.9 MB in the beginning and 200.3 MB in the end (delta: 61.3 MB). Free memory was 91.1 MB in the beginning and 179.0 MB in the end (delta: -87.9 MB). Peak memory consumption was 12.8 MB. Max. memory is 7.1 GB. * RCFGBuilder took 232.67 ms. Allocated memory is still 200.3 MB. Free memory was 178.4 MB in the beginning and 167.8 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 23232.27 ms. Allocated memory was 200.3 MB in the beginning and 504.4 MB in the end (delta: 304.1 MB). Free memory was 167.2 MB in the beginning and 320.1 MB in the end (delta: -152.9 MB). Peak memory consumption was 151.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] unsigned int input = __VERIFIER_nondet_uint(); [L11] CALL, EXPR id(input) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND FALSE !(x==0) [L6] CALL, EXPR id(x-1) [L5] COND TRUE x==0 [L5] return 0; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) [L11] unsigned int result = id(input); [L12] COND TRUE result == 20 [L13] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 23.1s, OverallIterations: 21, TraceHistogramMax: 21, AutomataDifference: 6.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 684 SDtfs, 2 SDslu, 14532 SDs, 0 SdLazy, 8656 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 940 GetRequests, 500 SyntacticMatches, 0 SemanticMatches, 440 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 10.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 15.7s InterpolantComputationTime, 1533 NumberOfCodeBlocks, 1533 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 1380 ConstructedInterpolants, 0 QuantifiedInterpolants, 465600 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 20 InterpolantComputations, 1 PerfectInterpolantSequences, 3800/7600 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...