/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive/Fibonacci04.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:18:10,164 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:18:10,166 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:18:10,209 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:18:10,209 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:18:10,218 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:18:10,220 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:18:10,222 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:18:10,225 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:18:10,227 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:18:10,228 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:18:10,230 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:18:10,231 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:18:10,234 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:18:10,237 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:18:10,238 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:18:10,240 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:18:10,241 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:18:10,243 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:18:10,251 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:18:10,253 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:18:10,254 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:18:10,255 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:18:10,256 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:18:10,270 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 17:18:10,286 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:18:10,287 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:18:10,290 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:18:10,291 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 17:18:10,328 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:18:10,328 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:18:10,330 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:18:10,331 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:18:10,331 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:18:10,331 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:18:10,331 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:18:10,331 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:18:10,332 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:18:10,332 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:18:10,333 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:18:10,333 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:18:10,333 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:18:10,334 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:18:10,334 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:18:10,334 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:18:10,334 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:18:10,335 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:18:10,335 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:18:10,335 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:18:10,335 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:18:10,336 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:18:10,336 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:18:10,336 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:18:10,336 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:18:10,337 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:18:10,337 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:18:10,337 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:18:10,337 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:18:10,337 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:18:10,647 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:18:10,661 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:18:10,664 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:18:10,666 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:18:10,666 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:18:10,667 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-21 17:18:10,741 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b1cf7244a/376aaeaa800f431a8000595b8c858bd7/FLAGd28b179b9 [2020-08-21 17:18:11,261 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:18:11,262 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive/Fibonacci04.c [2020-08-21 17:18:11,267 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b1cf7244a/376aaeaa800f431a8000595b8c858bd7/FLAGd28b179b9 [2020-08-21 17:18:11,624 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b1cf7244a/376aaeaa800f431a8000595b8c858bd7 [2020-08-21 17:18:11,635 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:18:11,637 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:18:11,639 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:18:11,640 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:18:11,643 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:18:11,644 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,648 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1487e564 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11, skipping insertion in model container [2020-08-21 17:18:11,648 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,657 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:18:11,677 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:18:11,844 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:18:11,848 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:18:11,865 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:18:11,881 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:18:11,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11 WrapperNode [2020-08-21 17:18:11,882 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:18:11,883 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:18:11,883 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:18:11,883 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:18:11,899 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,899 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,988 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,988 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,992 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,994 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,995 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... [2020-08-21 17:18:11,997 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:18:11,997 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:18:11,998 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:18:11,998 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:18:11,999 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:18:12,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:18:12,056 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:18:12,056 INFO L138 BoogieDeclarations]: Found implementation of procedure fibonacci [2020-08-21 17:18:12,057 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:18:12,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:18:12,057 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 17:18:12,057 INFO L130 BoogieDeclarations]: Found specification of procedure fibonacci [2020-08-21 17:18:12,057 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:18:12,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:18:12,058 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:18:12,245 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:18:12,246 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-08-21 17:18:12,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:18:12 BoogieIcfgContainer [2020-08-21 17:18:12,250 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:18:12,252 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:18:12,252 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:18:12,262 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:18:12,263 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:18:11" (1/3) ... [2020-08-21 17:18:12,263 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2de711d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:18:12, skipping insertion in model container [2020-08-21 17:18:12,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:18:11" (2/3) ... [2020-08-21 17:18:12,264 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2de711d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:18:12, skipping insertion in model container [2020-08-21 17:18:12,264 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:18:12" (3/3) ... [2020-08-21 17:18:12,266 INFO L109 eAbstractionObserver]: Analyzing ICFG Fibonacci04.c [2020-08-21 17:18:12,278 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:18:12,286 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:18:12,302 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:18:12,331 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:18:12,331 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:18:12,332 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:18:12,332 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:18:12,333 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:18:12,333 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:18:12,333 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:18:12,333 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:18:12,359 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states. [2020-08-21 17:18:12,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 17:18:12,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:12,371 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:12,372 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:12,380 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:12,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1356498376, now seen corresponding path program 1 times [2020-08-21 17:18:12,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:12,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2043344007] [2020-08-21 17:18:12,395 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:12,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:12,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:12,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:12,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:12,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:12,629 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:18:12,630 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2043344007] [2020-08-21 17:18:12,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:18:12,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:18:12,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037583855] [2020-08-21 17:18:12,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:18:12,641 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:12,656 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:18:12,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:18:12,660 INFO L87 Difference]: Start difference. First operand 23 states. Second operand 5 states. [2020-08-21 17:18:12,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:12,771 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-08-21 17:18:12,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:18:12,774 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 17:18:12,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:12,786 INFO L225 Difference]: With dead ends: 35 [2020-08-21 17:18:12,787 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 17:18:12,791 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:18:12,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 17:18:12,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-21 17:18:12,834 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 17:18:12,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-21 17:18:12,837 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-08-21 17:18:12,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:12,838 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-21 17:18:12,838 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:18:12,838 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-21 17:18:12,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 17:18:12,840 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:12,841 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:12,841 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:18:12,842 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:12,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:12,842 INFO L82 PathProgramCache]: Analyzing trace with hash 1591396412, now seen corresponding path program 1 times [2020-08-21 17:18:12,843 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:12,843 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [429983523] [2020-08-21 17:18:12,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:12,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:12,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:12,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:12,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:12,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:12,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:18:12,947 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [429983523] [2020-08-21 17:18:12,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:18:12,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:18:12,949 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419829137] [2020-08-21 17:18:12,951 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:18:12,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:12,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:18:12,952 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:18:12,953 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-08-21 17:18:13,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:13,020 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-21 17:18:13,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:18:13,021 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 17:18:13,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:13,023 INFO L225 Difference]: With dead ends: 27 [2020-08-21 17:18:13,023 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 17:18:13,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:18:13,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 17:18:13,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-08-21 17:18:13,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 17:18:13,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-08-21 17:18:13,032 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-08-21 17:18:13,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:13,033 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-08-21 17:18:13,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:18:13,033 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-08-21 17:18:13,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:18:13,035 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:13,035 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:13,035 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:18:13,036 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:13,036 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:13,036 INFO L82 PathProgramCache]: Analyzing trace with hash -1761048597, now seen corresponding path program 1 times [2020-08-21 17:18:13,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:13,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [401586690] [2020-08-21 17:18:13,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:13,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,069 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:13,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:13,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:13,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-21 17:18:13,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,160 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-08-21 17:18:13,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [401586690] [2020-08-21 17:18:13,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:18:13,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:18:13,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749153755] [2020-08-21 17:18:13,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:18:13,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:13,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:18:13,163 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:18:13,163 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 6 states. [2020-08-21 17:18:13,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:13,251 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-08-21 17:18:13,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:18:13,252 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2020-08-21 17:18:13,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:13,254 INFO L225 Difference]: With dead ends: 38 [2020-08-21 17:18:13,254 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 17:18:13,255 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:18:13,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 17:18:13,262 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 17:18:13,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 17:18:13,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-08-21 17:18:13,264 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 26 [2020-08-21 17:18:13,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:13,265 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-08-21 17:18:13,265 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:18:13,265 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-08-21 17:18:13,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 17:18:13,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:13,267 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:13,268 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:18:13,268 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:13,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:13,269 INFO L82 PathProgramCache]: Analyzing trace with hash -624449707, now seen corresponding path program 1 times [2020-08-21 17:18:13,269 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:13,269 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [285094691] [2020-08-21 17:18:13,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:13,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:13,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,318 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:13,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:13,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:13,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,387 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:18:13,388 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [285094691] [2020-08-21 17:18:13,388 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:18:13,389 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:18:13,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1201192896] [2020-08-21 17:18:13,390 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:18:13,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:13,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:18:13,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:18:13,391 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 6 states. [2020-08-21 17:18:13,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:13,511 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2020-08-21 17:18:13,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:18:13,512 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 27 [2020-08-21 17:18:13,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:13,514 INFO L225 Difference]: With dead ends: 41 [2020-08-21 17:18:13,514 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 17:18:13,515 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:18:13,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 17:18:13,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-21 17:18:13,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 17:18:13,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 51 transitions. [2020-08-21 17:18:13,527 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 51 transitions. Word has length 27 [2020-08-21 17:18:13,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:13,528 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 51 transitions. [2020-08-21 17:18:13,528 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:18:13,528 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 51 transitions. [2020-08-21 17:18:13,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 17:18:13,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:13,530 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:13,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:18:13,531 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:13,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:13,532 INFO L82 PathProgramCache]: Analyzing trace with hash -111055954, now seen corresponding path program 2 times [2020-08-21 17:18:13,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:13,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1839775691] [2020-08-21 17:18:13,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:13,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,563 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:13,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:13,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:13,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:13,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:13,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,661 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 17:18:13,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,679 INFO L134 CoverageAnalysis]: Checked inductivity of 47 backedges. 23 proven. 7 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-08-21 17:18:13,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1839775691] [2020-08-21 17:18:13,680 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:18:13,680 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:18:13,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151928019] [2020-08-21 17:18:13,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:18:13,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:13,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:18:13,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:18:13,682 INFO L87 Difference]: Start difference. First operand 37 states and 51 transitions. Second operand 7 states. [2020-08-21 17:18:13,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:13,797 INFO L93 Difference]: Finished difference Result 76 states and 119 transitions. [2020-08-21 17:18:13,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:18:13,798 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 40 [2020-08-21 17:18:13,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:13,800 INFO L225 Difference]: With dead ends: 76 [2020-08-21 17:18:13,800 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 17:18:13,802 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:18:13,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 17:18:13,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 39. [2020-08-21 17:18:13,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:18:13,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 54 transitions. [2020-08-21 17:18:13,814 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 54 transitions. Word has length 40 [2020-08-21 17:18:13,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:13,814 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 54 transitions. [2020-08-21 17:18:13,814 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:18:13,814 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 54 transitions. [2020-08-21 17:18:13,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 17:18:13,816 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:13,817 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:13,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:18:13,817 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:13,817 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:13,818 INFO L82 PathProgramCache]: Analyzing trace with hash 380905728, now seen corresponding path program 3 times [2020-08-21 17:18:13,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:13,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222481333] [2020-08-21 17:18:13,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:13,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,845 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:13,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:13,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:13,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:13,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,913 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:13,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 17:18:13,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:13,925 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-08-21 17:18:13,925 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222481333] [2020-08-21 17:18:13,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:18:13,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:18:13,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [994375951] [2020-08-21 17:18:13,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:18:13,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:13,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:18:13,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:18:13,928 INFO L87 Difference]: Start difference. First operand 39 states and 54 transitions. Second operand 7 states. [2020-08-21 17:18:14,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:14,051 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2020-08-21 17:18:14,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:18:14,052 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 41 [2020-08-21 17:18:14,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:14,054 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:18:14,054 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 17:18:14,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:18:14,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 17:18:14,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 55. [2020-08-21 17:18:14,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 17:18:14,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 81 transitions. [2020-08-21 17:18:14,069 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 81 transitions. Word has length 41 [2020-08-21 17:18:14,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:14,070 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 81 transitions. [2020-08-21 17:18:14,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:18:14,070 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 81 transitions. [2020-08-21 17:18:14,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 17:18:14,074 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:14,074 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 9, 5, 5, 5, 5, 5, 5, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:14,075 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:18:14,075 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:14,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:14,075 INFO L82 PathProgramCache]: Analyzing trace with hash -1541039141, now seen corresponding path program 4 times [2020-08-21 17:18:14,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:14,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [805812074] [2020-08-21 17:18:14,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:14,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,122 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:14,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:14,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,191 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,215 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:14,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 17:18:14,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 17:18:14,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,256 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:14,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 17:18:14,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,293 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 22 proven. 127 refuted. 0 times theorem prover too weak. 147 trivial. 0 not checked. [2020-08-21 17:18:14,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [805812074] [2020-08-21 17:18:14,294 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:18:14,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:18:14,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [658638109] [2020-08-21 17:18:14,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:18:14,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:14,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:18:14,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:18:14,305 INFO L87 Difference]: Start difference. First operand 55 states and 81 transitions. Second operand 8 states. [2020-08-21 17:18:14,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:14,484 INFO L93 Difference]: Finished difference Result 97 states and 150 transitions. [2020-08-21 17:18:14,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:18:14,485 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 82 [2020-08-21 17:18:14,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:14,492 INFO L225 Difference]: With dead ends: 97 [2020-08-21 17:18:14,492 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 17:18:14,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:18:14,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 17:18:14,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 87. [2020-08-21 17:18:14,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 17:18:14,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 137 transitions. [2020-08-21 17:18:14,523 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 137 transitions. Word has length 82 [2020-08-21 17:18:14,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:14,524 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 137 transitions. [2020-08-21 17:18:14,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:18:14,524 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 137 transitions. [2020-08-21 17:18:14,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-08-21 17:18:14,532 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:14,532 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 17, 10, 10, 10, 10, 10, 10, 10, 7, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:14,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:18:14,533 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:14,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:14,533 INFO L82 PathProgramCache]: Analyzing trace with hash 1110256604, now seen corresponding path program 5 times [2020-08-21 17:18:14,534 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:14,534 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1874795965] [2020-08-21 17:18:14,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:14,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:18:14,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-08-21 17:18:14,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:14,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 17:18:14,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 17:18:14,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,735 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:14,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,743 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 17:18:14,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:14,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-21 17:18:14,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-08-21 17:18:14,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-08-21 17:18:14,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-08-21 17:18:14,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,890 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2020-08-21 17:18:14,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:18:14,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 249 proven. 381 refuted. 0 times theorem prover too weak. 526 trivial. 0 not checked. [2020-08-21 17:18:14,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1874795965] [2020-08-21 17:18:14,964 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:18:14,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:18:14,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238042558] [2020-08-21 17:18:14,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:18:14,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:18:14,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:18:14,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:18:14,966 INFO L87 Difference]: Start difference. First operand 87 states and 137 transitions. Second operand 12 states. [2020-08-21 17:18:15,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:18:15,354 INFO L93 Difference]: Finished difference Result 153 states and 266 transitions. [2020-08-21 17:18:15,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:18:15,354 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 150 [2020-08-21 17:18:15,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:18:15,356 INFO L225 Difference]: With dead ends: 153 [2020-08-21 17:18:15,357 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 17:18:15,360 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=177, Invalid=525, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:18:15,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 17:18:15,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2020-08-21 17:18:15,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 17:18:15,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 75 transitions. [2020-08-21 17:18:15,370 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 75 transitions. Word has length 150 [2020-08-21 17:18:15,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:18:15,371 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 75 transitions. [2020-08-21 17:18:15,371 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:18:15,371 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 75 transitions. [2020-08-21 17:18:15,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-08-21 17:18:15,374 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:18:15,374 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 7, 7, 7, 7, 7, 7, 7, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:18:15,374 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:18:15,374 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:18:15,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:18:15,375 INFO L82 PathProgramCache]: Analyzing trace with hash 580129251, now seen corresponding path program 6 times [2020-08-21 17:18:15,375 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:18:15,375 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [560772876] [2020-08-21 17:18:15,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:18:15,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-21 17:18:15,395 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-21 17:18:15,395 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-21 17:18:15,400 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:18:15,424 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.08 05:18:15 BoogieIcfgContainer [2020-08-21 17:18:15,425 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-21 17:18:15,428 INFO L168 Benchmark]: Toolchain (without parser) took 3790.03 ms. Allocated memory was 140.5 MB in the beginning and 246.4 MB in the end (delta: 105.9 MB). Free memory was 102.1 MB in the beginning and 110.3 MB in the end (delta: -8.2 MB). Peak memory consumption was 97.7 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:15,429 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-08-21 17:18:15,429 INFO L168 Benchmark]: CACSL2BoogieTranslator took 243.41 ms. Allocated memory is still 140.5 MB. Free memory was 101.9 MB in the beginning and 92.5 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:15,430 INFO L168 Benchmark]: Boogie Preprocessor took 113.98 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 92.5 MB in the beginning and 182.5 MB in the end (delta: -90.1 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:15,431 INFO L168 Benchmark]: RCFGBuilder took 252.70 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 170.3 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:15,432 INFO L168 Benchmark]: TraceAbstraction took 3173.30 ms. Allocated memory was 203.4 MB in the beginning and 246.4 MB in the end (delta: 43.0 MB). Free memory was 169.7 MB in the beginning and 110.3 MB in the end (delta: 59.3 MB). Peak memory consumption was 102.3 MB. Max. memory is 7.1 GB. [2020-08-21 17:18:15,436 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 243.41 ms. Allocated memory is still 140.5 MB. Free memory was 101.9 MB in the beginning and 92.5 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 113.98 ms. Allocated memory was 140.5 MB in the beginning and 203.4 MB in the end (delta: 62.9 MB). Free memory was 92.5 MB in the beginning and 182.5 MB in the end (delta: -90.1 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 252.70 ms. Allocated memory is still 203.4 MB. Free memory was 182.1 MB in the beginning and 170.3 MB in the end (delta: 11.8 MB). Peak memory consumption was 11.8 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3173.30 ms. Allocated memory was 203.4 MB in the beginning and 246.4 MB in the end (delta: 43.0 MB). Free memory was 169.7 MB in the beginning and 110.3 MB in the end (delta: 59.3 MB). Peak memory consumption was 102.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 33]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L28] int x = __VERIFIER_nondet_int(); [L29] CALL, EXPR fibonacci(x) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND TRUE n < 1 [L18] return 0; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND TRUE n < 1 [L18] return 0; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND FALSE !(n == 1) [L22] CALL, EXPR fibonacci(n-1) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND TRUE n < 1 [L18] return 0; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-1) [L22] CALL, EXPR fibonacci(n-2) [L17] COND FALSE !(n < 1) [L19] COND TRUE n == 1 [L20] return 1; [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L22] RET, EXPR fibonacci(n-2) [L22] return fibonacci(n-1) + fibonacci(n-2); [L29] RET, EXPR fibonacci(x) [L29] int result = fibonacci(x); [L30] COND FALSE !(x != 5 || result == 3) [L33] __VERIFIER_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 23 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.0s, OverallIterations: 9, TraceHistogramMax: 21, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 154 SDtfs, 161 SDslu, 354 SDs, 0 SdLazy, 510 SolverSat, 127 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 208 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=87occurred in iteration=7, 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, 8 MinimizatonAttempts, 27 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.1s InterpolantComputationTime, 502 NumberOfCodeBlocks, 502 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 385 ConstructedInterpolants, 0 QuantifiedInterpolants, 61017 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 1026/1574 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...